Nick Sleep

As of: 2026-07-04T00:04:44Z

Research note: T0308 A-profile was freshly claimed by another run when this task began and completed during closeout. This Task B file was researched independently from the official Nomad/IGY archive, regulatory filings, and source checks, then rebased onto the completed profile/source-map commit.

Core worldview

Nick Sleep's investment philosophy is easiest to misread if it is reduced to "buy Amazon and Costco and never sell." The deeper worldview is that the stock market chronically undervalues the duration of certain business systems, especially systems that share scale advantages with customers, suppliers, or other stakeholders instead of harvesting every short-term margin dollar. Sleep and Qais Zakaria described their public record as a journey from "cigar butt investing to near permanent holdings," and the official IGY publication note is explicit that the approved Nomad letters are the canonical version to cite (IGY preamble; IGY approved Nomad letters PDF).

The early Nomad letters sound closer to classic global value. In the first annual letter, Nomad said it wanted businesses trading at about half of real business value, run by owner-oriented management, with capital allocation consistent with long-term shareholder wealth creation (Nomad letters, Jan. 2002). But even there the philosophy is not simple cheapness. Sleep framed research as detective work and valued the right to hold cash rather than force capital into ideas that did not meet the criteria.

Over the next decade, the worldview shifted toward what the letters called "scale economies shared." The idea was that some rare companies become stronger by lowering prices, improving service, or giving efficiency gains back to customers. That choice can depress near-term margins but deepen trust, grow the addressable market, and create a compounding loop. Amazon, Costco, AirAsia, GEICO/Berkshire, and earlier cases such as Carpetright became the recurring examples. Costco's own 2002 10-K described a business model built around low prices, limited selection, efficient warehouses, low marketing, and membership economics, which is exactly the type of operating evidence Nomad prized (Costco 2002 Form 10-K).

That worldview also has a moral flavor without becoming charity. Sleep liked business systems where the customer was not merely exploited but invited into a reciprocal bargain. IGY's later "Short-term vs Long-term" note contrasts short-term, agent-like behavior with long-term principal behavior: primary data, patience, win-win orientation, facts, quality, and self-reinforcing spirals (IGY, Short-term vs Long-term). That is the same operating philosophy expressed in non-portfolio language.

The edge

Nomad's edge was not a private information edge in the illegal or even narrow informational sense. It was a framing edge. Sleep and Zakaria believed most investors over-discount what cannot be recognized in a near-term earnings model: customer loyalty, widening scale advantage, management culture, reinvestment runway, and the compounding harm of selling an exceptional business too early.

The early edge was geographical and psychological. Nomad could search globally, tolerate illiquidity where appropriate, and buy overlooked securities during post-bubble dislocation. The 2001 letter emphasized that a global mandate let Nomad search "far and wide" rather than buy whatever a benchmark offered (Nomad letters, Jan. 2002). The later edge was more philosophical: ask where the business is going, not just whether the stock is cheap. The letters' "destination analysis" was the habit of projecting the likely end state of an industry's economics and a company's role within it. That framework helped Nomad avoid banks before the financial crisis and stay with Amazon despite valuation discomfort (Nomad letters, 2007).

The market failure underneath was institutional time horizon. In a conventional mandate, a manager is judged against an index, a peer group, quarterly commentary, and career risk. Sleep treated that as a structural handicap. If a company deliberately gives margin back to customers today to create a larger business ten years later, many investors see only current margin sacrifice. Nomad tried to see the destination.

The public record supports that behavioral edge. By Q1 2014, the Sleep Zakaria 13F showed a U.S.-listed sleeve of only five line items, dominated by Amazon, Costco, Berkshire Hathaway A shares, and Liberty Global. Amazon alone was $994.8 million of a $1.50 billion reported 13F value, while Costco was $219.9 million (Sleep Zakaria Q1 2014 13F cover; Sleep Zakaria Q1 2014 13F table). This is not a full-fund weight, because 13F omits many non-U.S. and non-reportable holdings, but it does confirm that the visible late portfolio had become radically concentrated in the stated philosophy.

Process: idea sourcing -> research -> valuation & entry -> sizing -> portfolio construction -> sell discipline

Idea sourcing. Nomad began with a wide global search for mispriced businesses, not with a narrow screen for high-quality U.S. compounders. Early letters discuss holdings across Thailand, Hong Kong, the United States, Europe, Malaysia, South Africa, Norway, and other markets, with ideas ranging from newspapers and speedways to cement, retailers, insurers, airlines, and internet retail (Nomad letters, 2001-2004). The filter was value first, but not cheapness alone: owner orientation, capital allocation, and evidence of durable economics mattered from the start.

Research. The research habit moved from asset/value appraisal toward business-system appraisal. Sleep and Zakaria looked for the "DNA" of a company: incentives, customer proposition, cost advantage, reinvestment behavior, and management's willingness to defer short-term profits for long-term dominance. In the 2004 interim letter, they introduced the idea of a "terminal portfolio," meaning a small group of wonderful businesses where capital could remain for years because the business itself could compound better than the investor could by constantly switching holdings (Nomad 2004 interim letter mirror). By 2008, the research focus had crystallized into scale-economics-shared analysis across Amazon, Costco, AirAsia, and similar models (Nomad letters, 2008 annual).

Valuation and entry. Sleep did not abandon value discipline. The 2004 annual letter rejected the crude split between "growth" and "value" and treated value as future free cash flow discounted back (Nomad 2004 annual letter mirror). The important change was that the appraisal period lengthened. A statistically cheap company that would not improve its destination could lose to an apparently expensive company that could reinvest at high rates for a decade. Nomad still wanted a discount to value, but the value increasingly came from underestimated duration.

Sizing. Sizing followed a combination of conviction, liquidity, and knowability. Early Nomad held a diversified set of 18 to 25 positions. Later, as destination analysis and scale-economies-shared conviction rose, concentration rose too. The letters acknowledge large position weights, including Amazon becoming roughly one-sixth of the Partnership after its price had already moved substantially (Nomad letters, 2007). But Nomad did not size purely by enthusiasm. In the Union Cement example, the desired stake was constrained by illiquidity, and in the MBIA case sizing was constrained by the fact that Nomad could not recapitalize the business itself (Nomad letters).

Portfolio construction. The late portfolio became a test of whether the manager could keep saying no. The 2012 letter warned investors that the Partnership was concentrated, volatile, and unsuitable for capital with less than a five-year horizon or principals who could not tolerate long periods of discomfort (Nomad 2012 annual letter mirror). After Nomad closed, the regulatory trail confirms the end of outside-client discretion: Sleep, Zakaria & Co.'s Q2 2014 13F said the reporting person no longer exercised investment discretion over 13F securities and would stop filing holdings reports (Sleep Zakaria Q2 2014 13F).

Sell discipline. The default sell discipline was to avoid selling great businesses merely because the stock had risen. Stagecoach became the negative lesson: Nomad later described selling too early as a worse error than some losing investments, because the business kept compounding after sale (Nomad letters, 2007). But "never sell" is too simple. MBIA shows the hard boundary. Nomad sold because dilution risk made per-share value unknowable, turning a seemingly cheap security into an analytically unstable one (Nomad 2008 interim letter mirror).

Risk management

Sleep's risk management begins with the nature of the instrument. Nomad repeatedly rejected leverage, shorting, CFDs, options, synthetic products, and other "financial exotica." The 2003 annual letter is the cleanest statement of that boundary (Nomad 2003 annual letter mirror). The philosophy wanted the asymmetric upside of equity ownership, not the hidden fragility of engineered exposure.

The second risk control was time-horizon matching. Nomad was explicit that partners needed the ability to think in years, not quarters. The 2012 letter's investor-fit warning is a risk-control document as much as a marketing document: if client capital is impatient, a concentrated long-duration portfolio can be forced to sell at exactly the wrong time (Nomad 2012 annual letter mirror).

The third control was avoiding situations where the range of outcomes could not be underwritten. Banks before the financial crisis failed destination analysis because leverage, opacity, and system fragility made their future harder to know. MBIA failed when dilution and recapitalization questions made per-share value indeterminate. AirAsia, by contrast, shows that Nomad did not avoid all operating risk. It owned a leveraged, cyclical airline because the customer-value and scale thesis looked strong, while also flagging aircraft commitments, oil prices, competition, and financing risk. External aviation sources from 2008-2009 corroborate both the opportunity and the stress in AirAsia's model (Aviation Strategy, 2008; Aviation Strategy, 2009).

Finally, Sleep treated volatility as the price of a concentrated, underwritten portfolio rather than as risk itself. Nomad's 2008 result was worse than the MSCI World in that year, yet the subsequent recovery years were extraordinary. This does not prove that drawdowns are harmless; it proves that the strategy required capital and clients able to survive them (Nomad letters, 2008-2013).

Temperament & psychology

Sleep's temperament model is inactivity plus independent thought. The ideal investor works from primary data, accepts delayed gratification, and avoids the agent-like need to look busy. IGY's later long-term note is useful because it makes the psychological premises explicit: patient principals, primary data, facts, permanent capital appreciation, quality, and self-reinforcing spirals (IGY, Short-term vs Long-term).

In practice, that meant repeated decisions not to act. Holding Amazon after a large advance was not one decision; it was a new decision every time the stock looked optically expensive, every time a partner asked about concentration, and every time another opportunity seemed cheaper. The final 13F record shows that, late in the partnership, reported U.S. share counts in Amazon, Costco, and Berkshire were remarkably stable across multiple quarters (Sleep Zakaria Q1 2014 13F table).

There is also a low-profile, anti-performance-theater element to Sleep's temperament. The official preamble says the letters were originally private and later published in approved, lightly edited form after unauthorized copies circulated (IGY preamble). The postamble says they disliked the final phase of winding up partly because selling long-built stakes felt wrong and partly because they no longer wanted to justify actions and inactions to a changing set of interested parties (IGY postamble).

Evolution over career

The career arc moved through three phases. The first was Marathon-influenced global value: search broadly, buy at a large discount to business value, prefer owner-minded managers, and avoid benchmark captivity. The second was the discovery that a few companies could reinvest internally at exceptional rates because their models shared scale benefits with customers. The third was closure: once the portfolio consisted of a few superb businesses, continuing as a regulated outside manager no longer seemed worth the administrative and psychological cost.

The performance record made that evolution harder to dismiss as ex-post storytelling. The final 2013 table reported Nomad's cumulative gain since Sept. 10, 2001 at 921.1% before performance fees versus 116.9% for the MSCI World Net US$ index, with annualized performance of 20.8% before fees and an after-fee guide of 18.4% (Nomad letters, 2013 final table). The same table warns that the figures were unaudited, before fees in the headline table, and investor-specific after-fee results varied. Those caveats matter. The point for this philosophy file is not to certify a full track record; it is to show that the philosophy matured under live capital and public partnership reporting.

Post-Nomad, public records show Sleep remained economically and philanthropically active rather than returning to outside fund management. Sleep, Zakaria and Company Ltd remains an active UK company, and Companies House lists Nicholas Sleep as an active director of both Sleep, Zakaria and Company Ltd and I.G.Y. Limited (Companies House: Sleep Zakaria; Companies House: Nicholas Sleep appointments). The Charity Commission lists Nick Sleep as chair of IGY Foundation, charity number 1155564 (Charity Commission: IGY Foundation). I.G.Y. Limited's Q1 2026 13F reported Amazon, Berkshire Hathaway A, and Costco with a combined reported value of about $235.3 million, suggesting continuity in the personal or affiliated investment expression, though 13F remains an incomplete public snapshot (I.G.Y. Ltd Q1 2026 13F cover; I.G.Y. Ltd Q1 2026 13F table).

What they explicitly reject

Sleep and Zakaria explicitly rejected benchmark-relative investing. The 2006 annual letter argued that an index is not the right benchmark for a real owner because index-relative thinking forces opinions about companies outside the investor's competence and encourages over-diversification (Nomad 2006 annual letter mirror).

They rejected financial engineering as a substitute for business ownership: leverage, shorting, options, CFDs, synthetic structures, and related instruments were outside the intended return engine (Nomad 2003 annual letter mirror). They rejected the crude growth-versus-value divide, because a fast-growing business can be valuable if the future cash flows justify the price, and a cheap-looking business can be expensive if its destination is poor (Nomad 2004 annual letter mirror).

They also rejected asset gathering. The letters contain repeated signals that performance and investment integrity mattered more than maximizing fees or keeping a product alive. Closure was the most extreme expression of that rejection: the postamble says regulation, repeated justification, and the sense that the process had been mined out all pushed toward returning capital (IGY postamble).

Regimes where it thrives vs. struggles

The philosophy thrives when a few businesses can compound for a long time, the market is impatient with present reinvestment, and capital is allowed to remain invested through discomfort. It is especially powerful when a company has a genuine cost advantage and chooses to share it, because customer behavior can then reinforce the moat. Amazon and Costco were the cleanest public examples; AirAsia was the higher-risk version; Berkshire/GEICO supplied another model of customer-value compounding.

It struggles when capital is impatient, when redemptions or governance require constant explanation, when the business destination is unknowable, and when the investor confuses a statistically cheap security with a durable compounding machine. It also struggles to scale. Finding one Amazon or Costco early enough is not the same as building a repeatable process that always has another comparable candidate. Sleep and Zakaria themselves warned against extrapolating from early opportunity-set luck and acknowledged capacity constraints in smaller or illiquid ideas (Nomad letters).

The broader evidence base also warns against over-generalizing. Hendrik Bessembinder's work on long-run stock returns shows that a small minority of stocks account for a large share of equity wealth creation, which supports the logic of hunting for extreme winners but also underlines the difficulty of identifying them in advance (ASU summary of Bessembinder research). Michael Mauboussin and Dan Callahan's skill-versus-luck framing similarly cautions that in high-skill competitive fields, observed outcomes can still contain a large opportunity and luck component (Mauboussin and Callahan, Understanding the Paradox of Skill).

Tensions between stated philosophy and actual behavior

The first tension is concentration. Nomad's philosophy says volatility is not risk when the business is sound, but a portfolio that can fall 45% in a year requires unusually patient capital. That is a real client-base constraint, not merely a psychological slogan.

The second tension is the final liquidation. The postamble says selling long-built stakes "felt wrong," yet the fund did sell them and return capital (IGY postamble). The stated reason is coherent: regulation, autonomy, and the desire not to keep justifying inactivity. But it still means Nomad's greatest final act was not to hold forever inside the fund; it was to hand the problem back to partners.

The third tension is transferability. Many investors admire Sleep after seeing the ending: Amazon, Costco, Berkshire, long-term patience, charitable independence. Fewer can know in real time whether they are holding the next Amazon or merely a story that looks good after a price rise. A 2026 Value After Hours discussion makes the practical critique directly: copying famous investors without matching the strategy to one's own ability and temperament can turn admiration into error (Acquirer's Multiple transcript, 2026).

The fourth tension is source visibility. Nomad's letters are unusually rich, but they remain manager-authored. The late SEC 13Fs confirm much of the visible U.S. concentration but do not reconstruct full AUM, full holdings, investor-level returns, taxes, cash, non-U.S. positions, or exact realized P&L. The SEC Form ADV record identifies Sleep Zakaria as an exempt reporting adviser and states that the Financial Conduct Authority registration was withdrawn by June 29, 2015 (Sleep Zakaria Form ADV). That supports the wind-down record, but not a full independent ledger.

As of this run, targeted checks found no credible public SEC enforcement, FCA final notice, or litigation result tied to Nick Sleep, Qais Zakaria, Sleep Zakaria and Company Ltd, or Nomad Investment Partnership. The non-hagiographic caveats are therefore investment-process caveats: concentration, survivorship, capacity, post-closure opacity, and the danger of mistaking a rare realized outcome for an easily repeatable formula.

As of: 2026-07-04T05:20:15Z

Research note: This file treats "greatest trades" as documented Nomad Investment Partnership investments, not as a complete reconstructed position ledger. Nomad's approved letters are the dominant primary source, but they rarely disclose exact entry dates, realized dollar P&L by security, or full-fund weights after the portfolio became concentrated. Where a number comes only from the letters or a 13F filing, it is labeled [single-source] and interpreted cautiously. Public 13F filings are useful for late U.S.-reportable holdings, but they cover Section 13(f) securities rather than every asset: they exclude foreign ordinary shares traded outside the U.S., cash, total NAV, and short positions; they are not a full Nomad portfolio record (Nomad letters, 2001-2014; SEC 13F FAQ).

Ranking and caveats

Nomad's single best documented trade was Amazon. It combined very large final sizing, a long holding period, a severe mark-to-market test during 2008, and a visible late 13F value above $1.16 billion at year-end 2013. Costco was probably the purest expression of Sleep and Qais Zakaria's "scale economies shared" idea. Stagecoach was the clearest realized early multibagger, but also an error of premature sale. Berkshire Hathaway common stock was less a spectacular disclosed bargain and more the vehicle through which Berkshire and GEICO clarified what Nomad wanted to own. AirAsia, Matichon, and Union Cement round out the list because each shows a distinct part of the process: high-risk low-cost disruption, early Asian value work, and the problem of sizing a great but illiquid idea.

These trades should not be read as a cloning list. Nomad's final record was exceptional: +921.1% cumulative before performance fees from 10 September 2001 to 31 December 2013, or 20.8% annualized before performance fees and 18.4% after performance fees for an inception investor. The same table shows a -45.3% calendar-year loss in 2008. Those figures come from the manager letters; the public table is marked unaudited at publication, while the letters also state that administrator-produced performance was audited in annual audits. The after-fee experience varied by investor subscription date (Nomad letters, 2013 final table). Survivorship also matters: the public remembers the few companies that compounded for decades, while the ex-ante base rate for finding such extreme winners is low (Morgan Stanley / Mauboussin, 2022).

1. Amazon - the single best documented trade

Context & dates. Nomad was discussing Amazon as a core holding by the mid-2000s and still owned it when the partnership wound down after the 2013 letter. The exact first purchase date and average cost were not disclosed in the approved public letters. By the June 2007 interim letter, after Amazon's share price had doubled, the position was described as about one sixth of the Partnership [single-source]. Late 13F filings show the U.S.-reportable Amazon stake at 2.926 million shares and $1.167 billion at 31 December 2013 in Sleep Zakaria's amended Q4 2013 filing, then still nearly $995 million at 31 March 2014 (Nomad letters, 2006-2007; Sleep Zakaria 13F, 2013 Q4; Sleep Zakaria 13F, 2014 Q1).

Thesis & how they found it. Sleep and Zakaria saw Amazon as a company deliberately depressing current margins to deepen the customer proposition: low everyday prices, broader selection, better service, fulfillment scale, and reinvestment. Amazon's own 2001 annual report framed lower prices and free cash flow discipline as central, while the 2006 10-K described price reductions, free-shipping offers, and Prime as core customer-value investments rather than temporary promotions (Amazon 2001 annual report; Amazon 2006 10-K). Nomad's edge was not discovering a secret company. It was accepting that near-term accounting earnings understated the value of a widening reinvestment flywheel.

Size & structure. The position was common equity. The public weight record is incomplete, but the letters' one-sixth reference and the 2013-2014 13F data show that Amazon became the dominant visible holding. On the 31 December 2013 amended 13F, Amazon represented roughly 69.5% of reported 13F value [13F-only calculation], but that percentage is not the same as full-fund NAV (Sleep Zakaria 13F, 2013 Q4; SEC 13F FAQ).

Entry and the path. The hardest part was not the initial purchase; it was holding through violent disagreement between business progress and share price. In the crisis drawdown, Nomad's June 2009 interim letter said Amazon's revenue had grown dramatically from mid-2007 while the stock had fallen from around $100 to around $40 [single-source]. That happened inside a period when Nomad itself had fallen 45.3% in calendar 2008 (Nomad letters, 2009 interim and 2013 final table).

Exit & P&L. Nomad's exact realized Amazon P&L is not public. The partnership was liquidated a few months after the December 2013 letter, and the 30 June 2014 13F said Sleep Zakaria no longer exercised investment discretion over 13F securities and would not file holdings reports going forward; it does not disclose sale prices or prove a specific sale schedule (I.G.Y. postamble; Sleep Zakaria 13F, 2014 Q2). The late 13F value makes Amazon the most important visible contributor, but absolute fund-level P&L remains [unverified].

What it teaches. The trade teaches duration under uncertainty. The market repeatedly treated reinvestment as missing earnings; Nomad treated it as the source of future value. The trade also shows the behavioral cost of being right: a manager had to tolerate a huge mark-to-market fall in the best idea while outside observers could see only valuation and volatility.

Sources. Nomad letters; Amazon 2001 annual report; Amazon 2006 10-K; Sleep Zakaria 13F filings; I.G.Y. postamble; SEC 13F FAQ.

2. Costco - the cleanest "scale economies shared" case

Context & dates. Costco appeared early in Nomad's ownership record. The letters show Costco at about 3.1% of Partnership assets in 2002 and about 6.5% in the June 2004 letter [single-source]. Nomad still held Costco near the end of the partnership; the 31 December 2013 amended 13F reported 1.863 million shares worth about $221.7 million (Nomad letters, 2002-2004; Sleep Zakaria 13F, 2013 Q4).

Thesis & how they found it. Costco gave Nomad the operating template for a fair bargain with the customer. The company used membership economics, high inventory turns, limited selection, low markups, and scale purchasing to offer low prices and build trust. Costco's 2006 annual report supports this operating inference: membership revenue, high renewal rates, low prices, high sales volume, rapid inventory turns, and a reported gross margin of 10.55% fit a model where low gross margins were a chosen design feature rather than an accidental weakness (Costco 2006 annual report).

Size & structure. The position was common equity. The late 2013 13F value was much smaller than Amazon but still one of only four economic names in the visible U.S.-reportable book. Costco plus Amazon were more than 80% of the 31 December 2013 13F value [13F-only calculation], which fits the late-period concentration described in the letters, but 13F value is not full-fund NAV and excludes non-U.S. holdings, shorts, cash, and other non-13F assets (Sleep Zakaria 13F, 2013 Q4; SEC 13F FAQ).

Entry and the path. Costco was not a dramatic crisis purchase in the public record. It was more psychologically demanding because the market could look at thin reported margins and employee/customer giveaways and miss the compounding engine. Nomad's letters note that the share price had been broadly flat for years before the thesis became widely appreciated [single-source]. That underperformance is the drawdown's quieter cousin: time without validation.

Exit & P&L. Exact realized dollar P&L is not disclosed. The year-end 2013 13F share count/value and the early disclosed position weights show that Costco remained a meaningful long-duration holding, but public records do not establish Nomad's average cost, sale price, realized dollar P&L, or full-fund contribution. Treat any apparent multiple from public snapshots as incomplete and 13F-only, not as an audited trade record [13F-only / P&L unverified].

What it teaches. Costco shows that a low-margin business can be an unusually high-quality business if the low margin is chosen, durable, and tied to customer loyalty. It also explains why Sleep's philosophy migrated away from cheapness alone. Costco was not merely a bargain; it was a culture and incentive system that compounded.

Sources. Nomad letters; Costco 2006 annual report; Sleep Zakaria 13F filings; SEC 13F FAQ.

3. Stagecoach Group - the early multibagger and premature sale

Context & dates. Stagecoach was one of Nomad's great early value trades. The letters say Nomad bought in late 2002 at roughly 14p and made it the largest investment to date at about 8.6% of assets [single-source]. The background was ugly: Coach USA faced difficult North American trading conditions, restructuring, write-downs, debt and weak sentiment, and the market had little patience for the turnaround. Contemporary press captured the late-2002 stress around Stagecoach and Brian Souter's refocus on UK expansion and core operations (Nomad letters, 2002-2007; The Guardian, 2002; Stagecoach 2003 annual report).

Thesis & how they found it. The thesis was a classic Nomad Phase 1 bargain: a good domestic bus franchise buried inside a messy corporate story. The UK Bus business had durable local economics, cash generation, and management ownership/attention, while the balance sheet could improve as distractions were sold or fixed. Stagecoach's later 2005 annual report showed resilient UK Bus margins, continued strong cash generation, capital returns, and megabus expansion, supporting the view that the core business had not been permanently impaired (Stagecoach 2005 annual report).

Size & structure. The trade was common equity and large for early Nomad, at roughly 8.6% of assets at purchase [single-source]. This was before the final Amazon/Costco-style concentration but already showed willingness to size heavily when price, business quality, and management action aligned.

Entry and the path. The letters frame the entry around 14p and the eventual sale around 90p, roughly a sixfold gain [single-source]. The path required owning an out-of-favor, leveraged transport company while investors were still punishing its U.S. acquisition failure and balance-sheet stress.

Exit & P&L. Stagecoach was a realized winner and also a process regret. Sleep and Zakaria later wrote that selling around 90p was a mistake because the shares went above GBP 2.50, creating an opportunity cost they estimated around $12 million [single-source]. This is why Stagecoach ranks high: the realized P&L was excellent, but the post-sale lesson was even more valuable.

What it teaches. Stagecoach taught Nomad that the biggest error can be selling a good business too early, not just buying a bad one. It was a bridge from "this is cheap" to "what is the destination if we simply keep owning?" The competitive context should not be romanticized, though: later UK transport materials show that Stagecoach's Scottish intercity coach expansion / CityLink joint-venture activity drew competition scrutiny, including a case where regulators found consumer-harm concerns and required divestment. The lesson is about business durability and sale discipline, not an unqualified endorsement of aggressive local market tactics (OFT, 2006).

Sources. Nomad letters; Stagecoach 2003 and 2005 annual reports; Guardian 2002; OFT Stagecoach/CityLink decision.

4. Berkshire Hathaway common stock - GEICO as the model case

Context & dates. Berkshire Hathaway became one of Nomad's late visible holdings, with 666 Class A shares worth about $118.5 million on the 31 December 2013 amended 13F. The exact Nomad entry date and cost are not public, and the letters sometimes treat Berkshire and GEICO as a business-model case study rather than a single disclosed bargain trade (Sleep Zakaria 13F, 2013 Q4; Nomad letters, 2005-2013).

Thesis & how they found it. GEICO helped crystallize the "scale economies shared" idea. Berkshire's own annual reports described GEICO's direct-sales cost advantage, low operating costs, low prices, and customer growth loop. Buffett's 1995 and 1996 letters laid out why a lower-cost insurer could share savings with policyholders and compound market share; the 2004 report gave later evidence of GEICO's scale and profitability inside Berkshire (Berkshire Hathaway 1995 annual report; Berkshire Hathaway 1996 annual report; Berkshire Hathaway 2004 annual report).

Size & structure. The position was Berkshire Class A common stock. Late 13F values show it was meaningful but not comparable to Amazon in the reported U.S. book. The larger "trade" was intellectual: Berkshire/GEICO gave Nomad a live model for understanding Costco and Amazon.

Entry and the path. No public entry price or drawdown for Nomad's Berkshire position was found. The relevant path was philosophical. Sleep and Zakaria used GEICO to study how a business can give the customer a better deal, strengthen the moat, and still enrich owners over long periods.

Exit & P&L. Exact realized P&L is not public. The 2014 Q2 13F closeout shows discretion ended, but it does not disclose sale prices or proceeds by holding (Sleep Zakaria 13F, 2014 Q2).

What it teaches. Berkshire/GEICO is the control case: if the customer-value flywheel can work in auto insurance, it can be searched for elsewhere. The investment also warns against over-ranking trades only by disclosed profit. Some holdings are important because they sharpen the model that produces the biggest winners.

Sources. Nomad letters; Berkshire 1995, 1996, and 2004 annual reports; Sleep Zakaria 13F filings.

5. AirAsia - low-cost disruption with real operating risk

Context & dates. AirAsia entered Nomad's letters as a high-conviction Asian low-cost airline investment and, by the 2008 crisis, Nomad described itself as the company's largest foreign shareholder [single-source]. The position did not appear in U.S. 13F filings because it was a non-U.S. security, so public sizing and exit data are weaker than for Amazon or Costco (Nomad letters, 2007-2009).

Thesis & how they found it. The thesis was that AirAsia could bring low fares to a region still served by higher-cost incumbents, stimulate new demand, and use scale and operating discipline to widen its advantage. AirAsia's own 2005 annual report extract supports the operating story: rapid passenger growth, route expansion, and low unit costs even in a difficult fuel environment (AirAsia 2005 annual report extract).

Size & structure. The position was common equity. Exact fund weight is not public in the reviewed sources. Nomad discussed aircraft commitments, fuel costs, financing and lease-rate concerns, competition, and its own fleet-value appraisal, which means the trade was not a simple "quality compounder" in the Costco sense. It was a more leveraged, cyclical, execution-heavy version of scale shared with customers.

Entry and the path. The path was brutal. In 2008, fuel prices, finance charges, foreign-exchange and borrowing pressure, fuel-hedge losses, aircraft-order fears, and price competition with Malaysian Airlines and other regional carriers all tested the thesis. Independent industry coverage also flagged Thai AirAsia losses, political-demand weakness, lease-penalty and competition issues, and doubts about the long-haul low-cost model, so Nomad was underwriting fuel, FX, leverage, aviation-cycle, affiliate, and model risk rather than merely buying an obvious low-cost winner. Nomad argued that the market was valuing the business too pessimistically relative to its fleet and low-cost position [single-source]. This was a drawdown endured at the same time the Partnership itself fell 45.3% (Aviation Strategy, 2008; Aviation Strategy, 2009; Nomad letters, 2008).

Exit & P&L. No exact public realized P&L was found. Later letters continued to discuss AirAsia within the broader scale-economies-shared framework, but the final publicly visible 13F cannot capture the position. The result should be treated as [unverified] at trade-level P&L.

What it teaches. AirAsia is useful because it prevents a sanitized reading of Sleep. Nomad did not simply buy safe consumer compounders. It was willing to underwrite cyclical, financing, capacity, currency, fuel-hedging, competition, and control/take-private risk when the customer proposition, cost advantage, and destination looked compelling.

Sources. Nomad letters; AirAsia 2005 annual report extract; Aviation Strategy's 2008-2009 AirAsia coverage.

6. Matichon - early Thai media value and governance stress

Context & dates. Matichon was in Nomad's inaugural portfolio at about 3.2% of the fund at year-end 2001 [single-source]. It was a Thai-language newspaper company bought after the Asian crisis, with depressed advertising, no debt, family ownership, and a high dividend yield while the market still distrusted the cycle (Nomad letters, 2002).

Thesis & how they found it. The thesis was an early global value thesis: a culturally important media asset with improving circulation, cost cuts, advertising recovery potential, and a valuation around four times normalized free cash flow by Nomad's estimate [single-source]. This is pre-Amazon Sleep: obscure, international, cyclically depressed, and too small for many institutions.

Size & structure. The position was common equity, about 3.2% of fund assets at the initial year-end disclosure [single-source]. It was meaningful but not a terminal-portfolio position.

Entry and the path. The main risk was not only valuation but control and politics. No public mark-to-market drawdown record was found in the reviewed sources; the documented path risk was governance/control risk and Thai media-political risk. In 2005, GMM Grammy's attempted takeover of Matichon and Post Publishing triggered public concern about press freedom and media control. Voice of America reported the controversy and opposition from Thai media advocates, journalists, politicians, and citizens (VOA Matichon/GMM coverage; URL slug indicates 2005-09-22, live page displays October 31, 2009). Nomad's letters describe the episode as one where many investors exited but Nomad resisted an offer it viewed as too low [single-source]. Any profit from the case therefore sat inside a politically charged media-control fight, not merely a clean takeover arbitrage.

Exit & P&L. Exact exit date and P&L are not public. The letters imply the investment worked out satisfactorily, but that is not enough to state a precise return. Mark the trade-level result [unverified].

What it teaches. Matichon shows Sleep before the famous compounders: global, patient, willing to own a local-language media company, and willing to analyze governance/control risk. It also shows a limitation: without language fluency and local market/context knowledge, some edge depended on trusted local knowledge and Marathon's history with the company. The 2005 takeover fight also means this should be read as a politically exposed media-control case, not simply as a cheap newspaper stock.

Sources. Nomad letters; VOA 2005 Matichon/GMM takeover coverage, with date-display caveat.

7. Union Cement - the tiny fivefold idea that could not be sized

Context & dates. Union Cement was a Philippine cement investment from the early Nomad years. It is not great by total dollars, but it is one of the clearest public examples of price discipline, illiquidity, and opportunity cost. Nomad tried for months to buy shares around 1.5 to 2.5 U.S. cents, but could only accumulate about $1 million, roughly 1% of assets [single-source] (Nomad letters, 2003).

Thesis & how they found it. The company was, in Nomad's view, priced at a fraction of replacement cost even though the assets were large and modern. The low market price also explained the lack of supply: holders who understood the undervaluation stopped selling.

Size & structure. The position was common equity, but the inability to buy enough stock capped the impact. Nomad wrote that it might have been a meaningful 10% investment if the stock were available; instead it remained around 1% [single-source].

Entry and the path. The path was frustrating rather than frightening. No public drawdown path was found in the reviewed sources; the path constraint was illiquidity and inability to size. The business value was there, but the market's illiquidity prevented a properly sized position. Holcim later bought a control block at an effective price close to 10 U.S. cents per share, about five times Nomad's average cost [single-source].

Exit & P&L. The public letter does not provide a realized sale schedule, so the exact P&L is [unverified]. No independent corroborating source was cited in this run; all Union Cement economics should be treated as Nomad-reported, and Holcim's control-block price is not the same as Nomad's realized exit price. On the disclosed economics, it was a high-multiple small winner but not a major contributor to Nomad's total return.

What it teaches. Union Cement is the anti-Amazon. The analysis may be excellent, the price may be outstanding, and the outcome may validate the thesis, yet the trade can barely matter if the investor cannot size it. Capacity is part of edge.

Sources. Nomad letters.

Cross-trade lessons

First, the biggest money came from holding quality longer, not from trading more cleverly. Stagecoach's premature sale helped prepare Nomad to hold Amazon and Costco through discomfort. Second, "scale economies shared" was not a slogan pasted onto winners after the fact; it was built from operating evidence across GEICO, Costco, Amazon, AirAsia, and earlier retail/consumer examples. Third, public filings are partial. The 2013-2014 13F trail is powerful for Amazon, Costco, Berkshire, and Liberty Global, but nearly useless for AirAsia, Matichon, Union Cement, and other non-U.S. positions (Sleep Zakaria 13F, 2013 Q4; SEC 13F FAQ).

The anti-hagiography point is equally important. Nomad's greatest trades required a rare combination of vehicle structure, client trust, concentration tolerance, and temperament. The portfolio fell nearly in half in 2008. The public record does not supply audited trade-level P&L. Public enforcement and litigation searches did not surface a direct public action against Sleep, Zakaria, Sleep Zakaria, or Nomad, but several investee cases carried their own business, competition, political, or governance controversies. And the final decision to liquidate means the world never observed whether the same outside-fund strategy would have compounded through the next decade's very different regimes (Nomad letters, 2013; I.G.Y. postamble).

Nomad's legal wrapper also matters. The letters' legal notices describe a private fund context and warn that the vehicle was not a recognized UK retail scheme with ordinary statutory protections or compensation arrangements. That caveat is not an accusation of misconduct; it is a structural warning that the public record is a private partnership letter archive, not a continuously disclosed retail-fund record (Nomad letters, 2001-2014).

Open questions / P&L reconstruction gaps

• Exact first purchase dates, average costs, and realized sale prices for Amazon, Berkshire, AirAsia, Matichon, and Union Cement remain unavailable in the reviewed public record.
• Nomad's final liquidation happened a few months after the December 2013 letter, but public filings do not disclose realized proceeds by security.
• 13F snapshots support the late Amazon/Costco/Berkshire concentration story but cannot be converted into full NAV weights without non-U.S. positions, cash, and other omitted assets.
• AirAsia may have been economically important, but trade-level P&L and final size need a non-U.S. holding schedule or contemporaneous Nomad portfolio report.
• The relative contribution of Sleep and Zakaria cannot be separated from the co-authored letters; the intellectual and economic record is partnership-based.

As of: 2026-07-04T07:36:14Z

Research note: T0311 was selected as a stale retry. No committed D-task output file existed on main when this run began, while later Task E material was already present; this file therefore covers only Nick Sleep / Qais Zakaria / Nomad mistakes-and-losses and preserves the stray Task E work as pre-existing context. The evidence base is unusually first-party-heavy: the approved I.G.Y. Foundation release of the Nomad letters is the core source, and independent sources are used mainly to test the outside context around Stagecoach, AirAsia, Matichon, MBIA, filings, and current legal/regulatory status.

Executive map of the error set

Nomad's public record has a rare advantage for a mistakes file: Sleep and Zakaria named errors in their own letters and connected them to process changes. The biggest realized calendar-year loss was 2008, when the Partnership fell 45.3% versus a 40.7% fall for MSCI World Net US$ in the final performance table; at year-end 2008, the five-year trailing result had shrunk to roughly +0.4%, so this was not just an abstract volatility footnote (Nomad letters, 2008 and 2013). The biggest explicitly named analytical mistakes were Conseco and Stagecoach: one a business-quality and financial-fragility error, the other an error of selling a good business too early (Nomad letters, 2007). The most consequential omission/sizing error was Union Cement, where the idea reportedly rose about fivefold but Nomad could build only a 1% position despite believing it might have deserved 10% (Nomad letters, 2003).

The recurring pattern is not recklessness. It is the tension between three virtues that can conflict: patience, concentration, and analytical humility. Sleep wanted to own rare compounding businesses for a very long time, but the record shows how hard that is: Stagecoach was sold too soon, Amazon and AirAsia had to be held through ugly drawdowns, and MBIA was sold because a cheap-looking security became unknowable at the per-share level. The mistakes are therefore best read as process-stress tests rather than a list of permanent impairments.

Major losses, errors of omission, and near-death moments

1. 2008: the brutal drawdown that tested the whole model

The largest documented portfolio-level loss is 2008. Nomad's final performance table reports a 45.3% decline for the Partnership in calendar 2008, worse than the MSCI World Net US$ decline of 40.7% shown in the same table (Nomad letters, 2013). This is a calendar-year loss, not a verified peak-to-trough drawdown; no primary intra-year maximum drawdown number was found in this run. Because the table is drawn from manager letters, not an independently published audited fund database, the number should be labeled manager-reported; however, it is the same approved I.G.Y. archive used throughout the Canon for the Nomad record.

The drawdown did not destroy the long-term result: the final table still shows +921.1% cumulative before performance fees from 10 September 2001 through 31 December 2013, and 18.4% annualized after performance fees for an inception investor (Nomad letters, 2013). But it is a genuine anti-hagiography anchor. A concentrated, long-only, global equity partnership can be correct about business destination and still lose nearly half its marked value in one year.

What they said at the time was less about market timing and more about psychological anchoring. The 2008 annual letter treats stress as a condition that makes short-term outcomes feel more important than they are, then reanchors the work to price-to-value and business destination rather than recent NAV pain (Nomad letters, 2008). The same letter reflects on companies with too little operational and financial slack, using the crisis to sharpen the idea that businesses and investors need margins of safety beyond point estimates (Nomad letters, 2008). The behavioral root cause was not overtrading; it was exposure to businesses and market prices whose financing, customer demand, or valuation could compress together. The process change was to make resilience part of destination analysis rather than a separate balance-sheet checklist.

2. Conseco: cheapness without durable business quality

Conseco is important because the letters themselves treat it as one of Nomad's two biggest errors. Sleep and Zakaria later grouped Conseco with Stagecoach as a mistake, but of a different kind: Conseco was not a great business sold too soon; it was the type of statistically cheap, leveraged financial situation that taught them to demand better destination quality. The 2007 annual letter says Conseco went bankrupt, costing Nomad about $5 million immediately and about $10 million including opportunity cost [single-source] (Nomad letters, 2007).

The publicly opened sources in this run did not independently reconstruct Nomad's exact Conseco entry price, exit price, position size, or realized ledger impact beyond the letter's own $5m/$10m framing. That gap matters and should stay explicit. The lesson is nevertheless clear from the letters: the mistake was treating apparent valuation upside as enough when the business and balance sheet did not provide the kind of durable customer-economics engine that later defined Nomad. In Canon terms, Conseco marks the early-value-to-quality transition. It is a process mistake with a manager-reported loss figure, not a fully audited trade reconstruction.

3. Stagecoach: the painful error of selling too soon

Stagecoach was a successful trade that became a mistake because Nomad sold it too early. The letters describe buying around 14p and selling around 90p, then watching the shares move above GBP 2.50; Sleep and Zakaria estimated the opportunity cost at about $12 million [single-source] (Nomad letters, 2007). The result is psychologically useful: a sixfold gain can still be a mistake if the right decision was to keep owning.

External evidence supports the setup. Stagecoach's 2003 annual report showed a company emerging from stress: GBP 575m of exceptional Coach USA write-downs produced a statutory loss, while free cash flow rose and net debt fell (Stagecoach annual report, 2003). The same report emphasized restructuring Coach USA, strong UK Bus cash generation, and debt reduction, while contemporaneous press captured the late-2002 market shock around the U.S. operations (Guardian, 2002). By 2005, Stagecoach reported UK Bus margin strength and sharp megabus.com growth, evidence that the destination was improving rather than merely mean-reverting (Stagecoach annual report, 2005). By 2006, adjusted EPS had risen to 10.6p, net debt had fallen to GBP 135.9m, and continuing North America revenue grew 11.0%, further supporting the argument that the sale missed an improving destination (Stagecoach annual report, 2006).

The root cause was anchoring to the original undervaluation rather than re-underwriting the destination after the company improved. Sleep and Zakaria later argued that Stagecoach taught them to keep owning Amazon, while Conseco helped keep them out of U.S. banks in 2007; their rough arithmetic put the combined 2007 benefit of those lessons at about $60 million [single-source, directional] (Nomad letters, 2007). The process change was one of Nomad's defining later rules: once a business is improving in the right direction, do not sell merely because the original discount closed.

4. Union Cement: right idea, wrong size

Union Cement was the opposite problem: the analysis may have been right, but the position was too small to matter. Nomad wrote that it tried to buy shares around 1.5 to 2.5 U.S. cents and believed the idea might have justified a 10% position, yet illiquidity meant it accumulated only about 1% of assets. When Holcim bought a control block at close to 10 U.S. cents per share, Nomad's economics looked roughly fivefold on the available stock [single-source] (Nomad letters, 2003).

This was not a loss in percentage terms. It was an opportunity-cost mistake and a capacity lesson. The behavioral root cause was not timidity exactly; it was underestimating how impossible it can be to size an illiquid bargain once the market recognizes the same value. The process change was to treat liquidity and position-building as part of the investment thesis. A cheap stock that cannot be bought in size may validate the analyst and barely move the fund.

5. MBIA: analytical humility before a cheap-looking financial

MBIA was a boundary case in sell discipline. Nomad had owned it as a valuation idea, but the 2008 interim letter explains that dilution and recapitalization uncertainty made per-share value unstable enough that they sold rather than pretend precision (Nomad letters, 2008). This should be treated as a process save more than a loss: the mistake was letting the situation enter the portfolio, while the improvement was recognizing when the range of outcomes could no longer be underwritten.

Independent MBIA evidence validates the danger. MBIA reported a $2.7bn net loss for 2008, a large decline in adjusted book value per share from year-end 2007, heavy CDO impairments, litigation and claims activity tied to mortgage exposures, and a post-year-end restructuring into separate public finance and structured-finance-related entities (MBIA, 2009). That context supports Sleep/Zakaria's conclusion that a monoline insurer under crisis conditions was not a simple low-price compounder. The root cause was reaching into complexity; the process change was to require knowable per-share value, not just apparent asset value.

6. AirAsia: a scale-economics thesis with airline-cycle hazards

AirAsia is not documented as a finished Nomad loss in the public record, but it belongs in a mistakes-and-losses file because it was a high-stress position that exposed the danger of applying scale-economies-shared thinking to a capital-intensive, cyclical, fuel-sensitive airline. Nomad's letters describe AirAsia as a low-cost airline opportunity and, during 2008, discuss unsecured aircraft funding, nervous lenders, 175 A320s on order, a government-backed price war, and oil around $140 as live issues [single-source for Nomad's framing] (Nomad letters, 2007-2009).

External industry coverage was plainly more skeptical than a heroic shareholder letter. Aviation Strategy warned in March 2008 that AirAsia faced rising fuel prices, changing low-cost competition on Kuala Lumpur-Singapore, airport capacity constraints, and what it called disastrous fuel-risk management after oil-price bets went wrong (Aviation Strategy, 2008). A February 2009 follow-up noted that the shares fell from RM 2.11 in May 2007 to below RM 1 by mid-2008, that Nomad reportedly began buying below RM 1, and that a proposed Tune Air buyout collapsed because financing was not available in the crisis (Aviation Strategy, 2009). AirAsia's own 2008 annual report also showed the duality: passengers and revenue grew, but the company reported a RM 497m net loss and large net debt, so the stress was economic as well as sentimental (AirAsia annual report, 2008).

The root cause was a model-transfer risk. Costco and Amazon could share scale with customers from asset-light or high-turnover platforms; AirAsia shared low fares from a business exposed to aircraft orders, fuel, airport constraints, currency, regulation, and cyclical travel demand. The process lesson is not that airlines are uninvestable. It is that customer-value flywheels need a harsher capital-structure and cyclicality test outside retail and internet commerce. Later Nomad letters also reframed AirAsia-style risk through trust: an operational disaster would not necessarily destroy a company, but a dishonest response could (Nomad letters, 2011).

7. Matichon: local knowledge, governance, and political risk

Matichon began as a small early Thai media value investment. Nomad's first letter acknowledged an important limitation: Sleep and Zakaria did not read Thai and relied on Thai contacts for editorial context (Nomad letters, 2002). Later, Matichon became the subject of a politically sensitive takeover attempt. Nomad wrote that other shareholders wanted to sell into an offer it viewed as too low, and it framed the episode as a test of investor psychology and local market incentives (Nomad letters, 2006).

Independent reporting underscores the non-financial risk. Voice of America reported that the attempted purchase of the independent Thai newspaper group triggered public outcry amid broader concerns about media pressure under Prime Minister Thaksin Shinawatra; the article also noted criminal and civil pressure on other media critics and Freedom House's decline in Thailand media-freedom ranking (VOA, 2005). This was not merely a low P/E newspaper stock. It was a minority investment in a local-language, politically exposed media company.

The behavioral root cause was partly a strength: Nomad was willing to go where others would not. The process lesson is to separate analytical humility from adventurousness. If the investor cannot read the product, control the governance, or fully map the political context, position size and required discount must reflect that.

8. The final liquidation: structure as a source of regret

Nomad closed after excellent performance, but the postamble treats the wind-down itself as psychologically wrong. Sleep and Zakaria wrote that the portfolio had been liquidated and funds returned a few months after the December 2013 letter; selling stakes built over years felt wrong, clients were graceful, and the administrative process was awkward (I.G.Y. postamble, 2021).

The closure rationale is not reducible to regulation. The 2013 letter already warned that the number of regulators around Nomad's ecosystem had doubled to four and that regulatory scope had risen by an estimated order of magnitude, which they saw as a worsening environment for small, simple boutiques (Nomad letters, 2013). The postamble then cites the direction of regulation, the desire not to keep justifying actions and inactions to a changing audience, the sense that they had wrung all they could from the process, and the pull of independence and philanthropy (I.G.Y. postamble, 2021). The mistake, if one calls it that, was structural: an outside partnership can become misaligned with an almost permanent-hold portfolio if client communications, regulation, and administrative obligations begin to interfere with the intended behavior.

The SEC filing trail confirms the public end-state without proving exact sale proceeds. Sleep Zakaria's Q2 2014 13F stated that the reporting person no longer exercised investment discretion over 13F securities and would stop filing holdings reports (Sleep Zakaria 13F, 2014). Later I.G.Y. Limited 13Fs show Amazon, Costco, and Berkshire remained visible in a different affiliated filing context, but those filings are not a continuation of the Nomad fund record and cannot be used as investor-level performance data (I.G.Y. 13F table, 2026).

What they said about the mistakes

Sleep and Zakaria's most useful habit was writing about errors without making volatility itself the only villain. On Stagecoach, they treated premature sale as a genuine analytical failure, not as a missed chance no one could have foreseen; they even argued that selling an early Wal-Mart- or Microsoft-type winner can be mathematically worse than losing the same amount in a bankruptcy (Nomad letters, 2007). On Union Cement, they admitted the practical frustration of buying only a small amount of a very cheap stock (Nomad letters, 2003). On MBIA, they accepted that dilution uncertainty could make the per-share investment case too unstable (Nomad letters, 2008). On closure, they admitted that the mechanics of doing the right structural thing still felt wrong (I.G.Y. postamble, 2021).

The pattern is unusually candid but still first-party. It remains a manager-authored archive, approved and lightly edited by the authors for 2021 publication after unauthorized copies circulated (I.G.Y. preamble, 2021). That is a strength for process evidence and a limitation for independent arithmetic. Exact trade-level ledgers, average costs, realized proceeds, tax effects, investor-specific after-fee returns, and non-U.S. position histories are still not public.

Behavioral root causes

Anchoring. Stagecoach shows anchoring to the original purchase thesis. Once a stock moved from very cheap to less cheap, Nomad sold without fully updating the destination value. Later Amazon/Costco patience looks like a direct antidote.

Complexity creep. Conseco and MBIA show the temptation of financial companies that look statistically cheap but contain leverage, asset-liability mismatch, regulatory capital, and dilution risk. The later philosophy put more weight on business-model knowability and less on accounting cheapness.

Capacity mismatch. Union Cement shows that a great small idea can be economically irrelevant if it cannot be purchased in size. Illiquidity is not just a trading nuisance; it changes expected contribution.

Model over-transfer. AirAsia shows the risk of applying customer-value compounding logic to a more cyclical and capital-intensive industry. A low-cost operator may be advantaged and still exposed to fuel, financing, aircraft delivery schedules, foreign exchange, airport constraints, and competition.

Local-context reliance. Matichon shows the limits of investing in assets whose product, politics, and governance are partly mediated by local contacts. That does not make the investment wrong, but it raises the required humility and margin of safety.

Client-structure friction. The final liquidation shows that even successful outside capital can become a constraint. The best portfolio for a manager's own capital may not fit a vehicle that requires continuing reporting, regulation, and explanation to a changing audience.

Wealth and identity risk. Sleep's post-Nomad "X-Amount" essay frames surplus wealth as needing a separate mental category so it does not distort identity, relationships, or purpose (I.G.Y. X-Amount, 2021). That matters for a mistakes file because one possible failure mode after an extraordinary track record is simply to keep playing the same game for money that no longer changes one's life.

Process changes made after

The most important process change was from selling on valuation normalization to holding for destination quality. Stagecoach helped teach Nomad that the rare business should not be sold merely because the first valuation gap closes. That lesson became central to Amazon, Costco, and Berkshire.

The second change was to make per-share value knowability a hard boundary. MBIA is the clean example: once recapitalization and dilution risk made the per-share outcome unknowable, apparent cheapness was not enough. This later fed into an aversion to opaque financial leverage and financial engineering.

The third change was explicit partner-fit filtering. After the 2008 drawdown and late concentration, Nomad wrote more directly about the kind of capital that could tolerate concentrated inactivity. A strategy that requires partners to sit through a near-halving cannot be marketed like a conventional balanced fund.

The fourth change was structural. Closing Nomad returned the decision problem to partners and removed the outside-fund agency loop. That was costly because it forced liquidation, but it also prevented a successful record from becoming an asset-gathering product. Companies House still lists Sleep Zakaria as active, and Charity Commission records list Nick Sleep as I.G.Y. Foundation chair, but those records do not create a post-Nomad public fund record (Companies House, 2026; Charity Commission, 2026).

Legal, regulatory, and criticism check

As of 2026-07-04, this run found no direct public SEC enforcement action, FCA final notice, or litigation red flag tied to Nick Sleep, Qais Zakaria, Sleep Zakaria and Company Ltd., or Nomad Investment Partnership in the reviewed official and broad-web searches. That is not proof of absence. It is a public-source negative check. Companies House lists Sleep Zakaria as an active private limited company, with Nicholas Sleep and Qais Zakaria as active officers/directors, and the company nature of business as security and commodity contracts dealing activities (Companies House overview, 2026; Companies House officers, 2026). The SEC Form ADV snapshot identifies Sleep Zakaria as an exempt reporting adviser record and notes withdrawn FCA registration by 2015 (SEC Form ADV, 2015).

The proper criticism is therefore not scandal. It is evidentiary and transferability risk. The Nomad letters are self-reported and later curated; 13F filings omit non-U.S. holdings, cash, short positions, derivatives, total NAV, and investor-specific economics; and the strategy's public reputation is heavily shaped by a few hindsight-obvious winners (SEC 13F FAQ). Secondary discussions of Sleep often admire the result while warning against turning the ending into a simple recipe: William Green's work emphasizes temperament and life design, while investor interviews and retrospectives note survivorship, ASOS-style omissions, and the difficulty of copying the exact structure (William Green, 2021; Top Traders Unplugged, 2024; Acquirer's Multiple, 2023). The mistakes file should preserve that tension: Sleep's public record is excellent, but the exact ledger is incomplete and the behavior is hard to copy.

Open questions and reconstruction gaps

• Conseco needs a separate primary reconstruction: dates, position size, entry/exit prices, loss magnitude, and whether any Marathon-era documents clarify the mistake.
• Stagecoach's exact Nomad average cost, sale schedule, tax treatment, and dollar opportunity cost remain manager-letter-only.
• Union Cement economics are manager-letter-only in this run; Holcim/control-block records and Philippine filings should be retrieved before hardening the fivefold figure.
• AirAsia trade-level P&L, exact Nomad ownership, and exit path remain unreconstructed because non-U.S. holdings are not in 13F.
• MBIA's Nomad position size and realized outcome remain unreconstructed; the public conclusion is process-based rather than P&L-based.
• A full legal/regulatory check should include archived FSA/FCA register data, FCA final-notice database queries by FRN 451772 and predecessor names, Cayman records, and UK court databases. This run found no direct public red flag, but it was not a legal opinion.

As of: 2026-07-04T07:55:44Z

Research note: This Task E file uses the I.G.Y. Foundation's approved Nomad letter collection and first-party I.G.Y. pages as the quote spine. Direct snippets are intentionally very short. The approved Nomad PDF is treated as one source, so this file avoids reproducing long passages from it. Third-party podcasts, practitioner writeups, and mirror-hosted copies are used only for source hygiene and discovery unless otherwise noted.

Source hygiene

Nick Sleep and Qais Zakaria's first-party public corpus is unusually concentrated. The best source is the I.G.Y. Foundation's approved letter release, whose preamble says the public version was lightly edited mainly for privacy and asks readers to link to I.G.Y. rather than circulating unofficial copies (I.G.Y. Preamble, 2021; Nomad letters, 2001-2014). The letters are co-authored, so most Nomad snippets should be attributed to Sleep and Zakaria jointly, not to Sleep alone. Where the Nomad letters quote or credit another writer, this file labels the phrase as an embedded/credited idea rather than an original Sleep/Zakaria coinage.

The major quote risk is attribution laundering. Value Investor Insight's 2005 archive confirms a Costco item featuring Nicholas Sleep and Costco, but the archive page is metadata rather than article text; the issue itself is paywalled and the accessible full copies surfaced in this run were third-party uploads, so this file does not quote from those mirrors (Value Investor Insight archive, 2005). Founders/Colossus episodes and William Green's work are useful secondary context, but they are not clean Sleep primary sources unless a specific quote is verified against audio, transcript, or page-numbered book text (Colossus Founders #364, 2024; William Green bio).

Quote index by theme

Valuation, research, and process

Patience, inactivity, and risk

Customers, scale, and long-term systems

Closure, enough, and philanthropy

Foundation operating principles

Annotated primary-materials index

Because the approved Nomad archive is a single public PDF, this index points readers back to the canonical source while splitting the letter run by year. The entries are deliberately concise; page-level extraction should be done only when a later task needs a specific letter.

Interviews, podcasts, and secondary materials to use carefully

No verified standalone Sleep interview transcript or speech archive was clean enough to quote in this run. The usable own-words base remains the approved I.G.Y. letter archive, first-party I.G.Y. essays/pages, and carefully caveated secondary references.

Attribution watchlist

• Do not use quote-aggregator lines attributed to Nick Sleep unless they can be traced to the I.G.Y. collection, a first-party I.G.Y. page, a page-numbered book source, or a verified transcript.
• Do not attribute "Take a simple idea and take it seriously" to Sleep without qualification; secondary Sleep writeups commonly trace the line to Charlie Munger.
• Do not attribute Amazon-advertising aphorisms or "we think far less than we think we think" to Sleep/Zakaria; the letters credit those ideas to Jeff Bezos and John Kearon, respectively.
• A circulating line about the best investors not being investors was flagged during this run because it appeared in secondary podcast materials but was not located in the approved I.G.Y. PDF. Leave it out until a primary origin is found.
• Claims that regulators forced Nomad's closure should be phrased carefully. The I.G.Y. postamble says regulation was one factor, but also emphasizes autonomy, not wanting to justify action or inaction, the maturity of the process, and the pull of philanthropy (I.G.Y. Postamble, 2021).
• The I.G.Y. pages and approved letters are first-party but still curated. They are excellent for Sleep/Zakaria's own words; they are not independent verification of every performance or biographical claim.

As of: 2026-07-04T09:41:57Z

This file treats the public Nick Sleep corpus as a two-author corpus wherever the evidence requires it. The Nomad Investment Partnership letters, the I.G.Y. preamble, and the I.G.Y. postamble are signed or presented as the work of Nick Sleep and Qais Zakaria; later I.G.Y. essays explicitly signed by Sleep are attributed to Sleep, while noting where they still reflect the Sleep/Zakaria thought partnership. The I.G.Y. operating pages are institutional foundation pages, not signed investment essays. The approved I.G.Y. archive is also a curated public release. Sleep and Zakaria explain that unauthorized copies circulated first and that the approved version was lightly edited mainly for privacy, so this file cites the I.G.Y.-hosted archive rather than bootleg PDFs and does not pretend that the public archive is the original private investor packet (I.G.Y. preamble; approved Nomad letters PDF).

Works by Sleep, Zakaria, and I.G.Y.

1. Nomad Investment Partnership letters, 2001-2014

Central thesis. The Nomad letters are the essential Sleep/Zakaria work. Read as a whole, they show an allocator moving from global bargain hunting toward a small set of exceptional businesses that could compound for very long periods because they shared scale advantages with customers. The letters are not a clean audited performance database, but they are the best primary record of the thought process behind Nomad's Amazon, Costco, Berkshire, Stagecoach, AirAsia, Matichon, Union Cement, Conseco, and MBIA decisions (approved Nomad letters PDF; I.G.Y. postamble).

Key ideas.

1. Owner orientation beats market orientation. The letters repeatedly push partners to think like owners of businesses, not renters of ticker symbols. Reported marks, benchmark comparisons, and near-term price movements are treated as secondary to the progress of the underlying enterprise (approved Nomad letters PDF).

2. Value is future free cash flow, not style-box cheapness. The early Nomad years include more conventional cigar-butt and asset-value opportunities, but the letters increasingly reject the simple growth-versus-value split. A business may look statistically expensive and still be undervalued if the market misprices the duration and reinvestment runway of its free cash flow (I.G.Y. preamble; approved Nomad letters PDF).

3. Scale economies shared are the master model. Costco, Amazon, and GEICO/Berkshire are used to show a loop in which lower unit costs are shared with customers through lower prices, which increases customer trust and volume, which widens the cost advantage. The letters' most transferable insight is not "buy Amazon" or "buy Costco"; it is to look for systems where customers, suppliers, employees, and owners all help strengthen the same flywheel (approved Nomad letters PDF; Berkshire 1996 annual report; Costco 2006 annual report).

4. Destination analysis matters more than a static multiple. Sleep and Zakaria spend more energy asking where a business is likely to end up than where it traded yesterday. That does not make valuation optional; it changes the unit of analysis from next year's earnings multiple to the likely end-state of the business system (approved Nomad letters PDF; William Green interview transcript).

5. Inactivity can be a decision. The "terminal portfolio" idea is the clearest expression of Nomad's mature style: if a few holdings are run by unusually good people, have durable economics, and can reinvest at high rates, the right activity level may be extremely low. The letters make patience an analytical conclusion rather than a slogan (approved Nomad letters PDF).

6. Investor base is part of the strategy. Nomad's concentration and willingness to look wrong for long stretches required partners who could tolerate volatility and silence. The 2012 annual letter is especially important because it frames partner fit, time horizon, and principal-agent mismatch as risk controls, not marketing preferences (approved Nomad letters PDF).

7. Risk is misanalysis, leverage, dilution, and impaired optionality, not volatility alone. The MBIA and 2008 passages are useful because they show Nomad selling or limiting positions when per-share value became unknowable or when the partnership could not control recapitalization risk. That is different from refusing to hold a stock simply because its price fell (approved Nomad letters PDF; MBIA 2008 results release).

8. Selling is hardest when the original cheapness was real. Stagecoach is the best lesson here. Nomad recognized the stress case well and made money, but the later letters treat the sale as premature because the destination improved more than the price alone conveyed. It is a useful antidote to the idea that a value investor's job ends when the discount closes (approved Nomad letters PDF; Stagecoach 2005 annual report).

9. The process ended on purpose. The post-2013 closure should not be reduced to "regulation made them quit." Sleep and Zakaria say the portfolio was liquidated and partner capital returned after a mix of regulatory burden, unwillingness to keep explaining action and inaction to a changing audience, a feeling that the investment process had been wrung out, and a pull toward independence and philanthropy (I.G.Y. postamble; SEC Q2 2014 13F cover page).

Best chapters / letters to read. Start with the preamble for provenance, then read the 2001 launch material for the original global-value posture; the 2003 annual letter for the rejection of leverage and financial exotica; the 2004 interim and annual letters for terminal-portfolio thinking and free-cash-flow valuation; the 2006 annual letter for benchmark and diversification critique; the 2007-2008 letters for Amazon, Stagecoach, MBIA, and crisis behavior; the 2012 annual letter for partner-fit warnings; and the 2013 final letter plus postamble for the record, liquidation, and closure rationale (I.G.Y. preamble; approved Nomad letters PDF; I.G.Y. postamble).

Caveats. The public letters exclude the private schedules of investments, audited accounts, and administrator statements that partners received. Exact position sizes, investor-specific net results, realized trade P&L, taxes, cash, non-U.S. holdings, and full fund economics therefore cannot be reconstructed from the public archive alone. Late 13F filings help identify U.S.-reportable holdings but are not AUM or full portfolios; SEC guidance says 13F covers a defined list of securities and omits many asset classes and exposures (SEC Form 13F FAQ; Investor.gov 13F explainer).

2. 3 June 2014 letter to Warren Buffett

Central thesis. This short Sleep-signed letter is the cleanest first-party bridge between Nomad's close and the later I.G.Y. posture. It says Sleep and Zakaria had returned client capital, frames Berkshire as one of the rare homes for truly long-duration capital after Nomad, and gives first-party context that the partnership had made around US$2 billion for clients before closure. It is useful evidence, but not a substitute for audited client-by-client returns (approved Nomad letters PDF, September 2021 version).

Key ideas.

1. The post-Nomad endpoint was not simply cash; it included moving long-term capital toward Berkshire.
2. Sleep frames Buffett and Munger as teachers whose discipline shaped the Nomad letters.
3. The letter reinforces sufficiency: after making money for clients, the next question was how to place capital and attention rationally.
4. It is signed by Sleep, while still reflecting the Sleep/Zakaria partnership story.
5. Because it appears in one approved I.G.Y. PDF version, researchers should cite the September 2021 PDF and note that the March 2021 version has different pagination and contents.

Best chapter / use. Pair this letter with the final Nomad letter and postamble when discussing closure, Berkshire, and the move from partnership management to long-duration capital stewardship.

3. I.G.Y. preamble, 2021

Central thesis. The preamble is a source-control document. It explains why Sleep and Zakaria published an approved public version of letters that were originally private, asks readers to use the I.G.Y. version, and gives the authors' own retrospective summary of the arc from cigar-butt investing to ownership of "near permanent holdings" (I.G.Y. preamble).

Key ideas.

1. The letters were private partner communications before becoming a public archive.
2. Circulating copies created a need for a clean, approved version.
3. Privacy edits matter; researchers should not treat the archive as a perfect original packet.
4. The authors themselves frame the investment journey as an evolution, not a static doctrine.
5. The preamble establishes the attribution baseline: Sleep and Zakaria jointly for the Nomad corpus.
6. The approved archive is a teaching document, but it should still be read with manager-letter bias in mind.

Best chapter / use. Read this before quoting anything from Nomad. It belongs at the front of every source map because it governs provenance and attribution (I.G.Y. preamble).

4. I.G.Y. postamble, 2021

Central thesis. The postamble is the best first-party explanation of why Nomad ended and how Sleep and Zakaria understood the transition from investment partnership to independence and philanthropy. It matters because it prevents a false narrative in which the partnership simply stopped because of a single regulatory cause or because the opportunity set vanished (I.G.Y. postamble).

Key ideas.

1. The portfolio was liquidated and capital returned after the final letter period.
2. Regulation was part of the burden, but not the only reason.
3. The authors did not want to keep explaining every action and inaction to an audience whose composition changed over time.
4. The investment process itself had become less personally necessary after years of refinement.
5. The closure is linked to sufficiency and philanthropy, not merely burnout.
6. The postamble is a guardrail against hagiography: even a successful structure may be deliberately shut when its human purpose changes.

Best chapter / use. Pair the postamble with the 2013 final Nomad letter whenever discussing the fund's end, performance table, or subsequent I.G.Y. work (approved Nomad letters PDF; I.G.Y. postamble).

5. X-Amount, 2021

Central thesis. "X-Amount" is Sleep's most direct post-Nomad essay on sufficiency. The investment question is no longer just "How should capital compound?" but "What is excess capital for once personal sufficiency has been reached?" This makes the essay essential for understanding the moral and practical bridge between Nomad and I.G.Y. (I.G.Y. X-Amount).

Key ideas.

1. Personal wealth above sufficiency should be mentally separated from capital needed for ordinary life.
2. The identity attached to being rich can interfere with rational reallocation.
3. Capital has optionality only if the owner remains willing to redirect it.
4. The same long-term, first-principles habits used in investing can apply to philanthropy.
5. Sleep's post-Nomad life is not a rejection of capital allocation; it is a change in beneficiary and time horizon.
6. The essay helps explain why I.G.Y. appears deliberately low-profile and patient rather than promotional (I.G.Y. homepage; I.G.Y. X-Amount).

Best chapter / use. Read after the postamble. It is the cleanest Sleep-only piece for understanding sufficiency, identity, and capital's social purpose.

6. Short-term vs Long-term, 2022

Central thesis. This essay translates the investment letters' long-duration thinking into a broader checklist for behavior, charity, and institutional design. Although signed by Sleep, it repeatedly evokes the Sleep/Zakaria partnership and should be read as a Sleep-signed continuation of the partnership's habits, not as a wholly detached solo doctrine. It is less about stock selection than about what kinds of information, incentives, and relationships survive time (I.G.Y. Short-term vs Long-term).

Key ideas.

1. Long-term behavior is built from environment, habit, and incentives, not calendar labels.
2. Primary data and firsthand observation are better than fashionable summaries.
3. Trust and reputation compound slowly and can be damaged quickly.
4. Customer-first systems often look inefficient to short-term observers because they reinvest surplus into future loyalty.
5. Patient evaluation is as relevant in philanthropy as in public equities.
6. The essay is a later echo of Nomad's Amazon/Costco framework, but without the hedge-fund wrapper (I.G.Y. Short-term vs Long-term; Amazon 2006 Form 10-K).

Best chapter / use. Use it as the post-Nomad companion to the scale-economies-shared letters. It is especially helpful for readers trying to separate Sleep's method from the specific stocks Nomad owned.

7. I.G.Y. Foundation operating pages

Central thesis. The I.G.Y. homepage, guiding principles, and "What Are We Looking For?" pages show Sleep's capital-allocation principles after Nomad: low profile, patient inquiry, root-cause focus, partnership with founders, and reluctance to impose control for its own sake (I.G.Y. homepage; I.G.Y. principles; I.G.Y. What Are We Looking For?).

Key ideas.

1. The foundation is explicitly linked to profits from Nomad.
2. The International Geophysical Year metaphor signals open inquiry and coordinated discovery rather than brand-building.
3. The foundation values doing its own work and staying low profile.
4. It looks for simplicity, root causes, founder energy, and scalable effect.
5. It prefers partnership over control.
6. Its grant-making posture resembles the letters' business-owner posture: understand the system, support rational operators, and avoid noisy intervention.

Best chapter / use. These pages are institutional foundation pages rather than signed investment letters, but they are the best evidence that Sleep carried the same epistemic habits into philanthropy. Use them to connect the investment and post-investment chapters without overclaiming that charity grants are a public-markets track record.

8. Primary and near-primary interviews: the 2005 Value Investor Insight Costco interview

Central thesis. The February 22, 2005 Value Investor Insight issue is the most important contemporaneous non-letter Sleep interview located in this run. The official archive confirms Nicholas Sleep and Costco in that issue; available full-text copies are mirrored or paywalled, so the article should be treated as a high-value lead and a near-primary source only with provenance caveats (Value Investor Insight 2005 archive).

Key ideas.

1. Costco was not a simple low-multiple idea; it was a business-quality and reinvestment-duration idea.
2. The market's concern about low margins can miss a model that deliberately shares savings with customers.
3. Membership economics, limited selection, and trust create a self-reinforcing system.
4. The interview is valuable because it was contemporaneous with Nomad's ownership, not a retrospective victory lap.
5. Full quotation or detailed reliance should wait for official access or a clean archival copy.

Best chapter / use. Use the official archive for provenance, then verify any article-specific claims against the original issue before quoting. Do not cite bootleg or third-party copies as if they were the publisher's own public text.

9. Forthcoming / metadata watch: Nomad Letters print edition

Retail and bibliographic metadata in this run showed a forthcoming Stripe Matter or Stripe Press edition of Nomad Letters by Nicholas Sleep and Qais Zakaria, with conflicting 2026 publication dates and references to a prologue or foreword. As of this file's as-of date, opened retail pages commonly listed December 1, 2026, 336 pages, and Stripe Press, while Google Books still listed Stripe Matter and a different 2026 date. No official Stripe Press book page was located in this run. Therefore, this file treats the print edition as a watch item, not as an available source for claims (Google Books metadata; Skylight Books metadata; Amazon metadata).

Best works about Sleep and Zakaria

1. William Green, Richer, Wiser, Happier

Why it ranks first. Green's chapter on Sleep and Zakaria is the best serious secondary source because it is based on direct access and because Sleep/Zakaria themselves point readers toward Green's work on the I.G.Y. site. It is especially useful on temperament, partnership design, information diet, inner scorecard, and the connection between investment success and life design (I.G.Y. homepage; William Green book page; William Green bio).

Use with care. Green is interpretive. Treat the book as a strong secondary source, not a substitute for the letters. Page-check before using direct quotes or detailed anecdotes, especially because many online summaries compress his chapter into unsourced slogans.

2. William Green interviews about the book

Why it ranks second. Green's interviews are valuable because he explains the Sleep/Zakaria material in his own voice: the deliberately inconvenient Bloomberg setup, resistance to short-shelf-life information, destination analysis, and the idea that environment design protects long-term thinking. The Investing by the Books transcript is especially useful because it gives a detailed author explanation without requiring the reader to infer everything from secondary summaries (Investing by the Books transcript; Top Traders Unplugged Green interview).

Use with care. These are author interviews, not interviews with Sleep and Zakaria. Use them for Green's interpretation and for pointers back to the primary corpus.

3. Investment Masters Class, "Learning from Nicholas Sleep"

Why it ranks third. This is one of the best free practitioner syntheses. It walks through the letters with enough detail to help a reader find the core passages: Marathon and Nomad background, the reported 20.8% gross annualized record versus 6.5% for MSCI World, the move from cigar-butts to compounders, and the importance of honestly run compounding machines (Investment Masters Class).

Use with care. Verify hard facts and return data against the approved letters. Treat the article as a map, not as the territory.

4. Colossus / Founders episodes 364 and 365

Why it ranks fourth. David Senra's Founders episodes are useful for listeners who want an accessible narrative version of the Sleep/Zakaria story and a companion read-through of the letters. Episode 364 is downstream of Green's book; episode 365 focuses directly on the letter collection (Colossus Founders #364; Colossus Founders #365).

Use with care. The show is secondary commentary. Transcripts may be gated or third-party, and one common transcript slug misspells Zakaria. Do not use it for exact quotes unless checked against the audio or official text.

5. The Investor's Podcast Network, TIP492 and Green follow-ups

Why it ranks fifth. TIP's Sleep episode is a useful structured overview of philosophy, Amazon, Costco, concentration, diversification, destination analysis, and crisis behavior. Later Green appearances help explain why the Sleep/Zakaria material has become a teaching text for patient investors (TIP492; TIP676).

Use with care. TIP labels transcripts as AI-generated in some cases. Use the episodes as orientation, then cite primary sources for final claims.

6. Professional and practitioner essays on scale economies shared

Why they rank here. Morgan Stanley/Mauboussin, Montaka, Quartr, Kingswell, Commoncog, Seed to S-1, MOI Global, and Greenhaven Road show how the Sleep/Zakaria framework traveled into the broader investment community. They are helpful for seeing what sophisticated readers extracted: scale economies shared, terminal portfolios, customer trust, habit change, and the psychological difficulty of holding obvious winners (Morgan Stanley, Measuring the Moat; Montaka; Quartr Costco; Commoncog; MOI Global; Greenhaven Road Q4 2021 letter).

Use with care. These sources are derivative. They are best for reception history and teaching notes, not for original facts about Nomad's portfolio or performance.

Recommended reading order

1. I.G.Y. preamble.
2. Nomad letters in chronological order, with special attention to 2001, 2003, 2004, 2006, 2007-2008, 2012, and 2013.
3. I.G.Y. postamble.
4. X-Amount and Short-term vs Long-term.
5. I.G.Y. operating pages.
6. William Green's chapter and author interviews.
7. Practitioner syntheses only after the primary corpus.

Source hygiene and unresolved gaps

The source base for Sleep is unusually rich in thought process and unusually thin in public ledgers. The approved letters give the philosophy, but not the private investment schedules or audited statements that partners saw. The two approved I.G.Y. PDFs also differ: the March 2021 archive is the earlier full collection, while the September 2021 PDF is the version that includes the separate June 2014 Buffett letter and should be cited for that item. Sleep Zakaria's late 13F filings show a U.S.-reportable sleeve before the partnership stopped reporting; I.G.Y. Limited's Q1 2026 13F shows three U.S.-listed holdings, but 13F table value is not total AUM, personal wealth, charity corpus, non-U.S. holdings, cash, taxes, shorts, private holdings, or investor-specific results (March 2021 Nomad letters PDF; September 2021 Nomad letters PDF; SEC Q1 2014 13F cover page; I.G.Y. Limited Q1 2026 13F filing; SEC Form 13F FAQ).

No opened primary source in this run showed public enforcement, litigation, or disciplinary action against Sleep, Zakaria, Sleep Zakaria, or Nomad. The available regulatory record is mostly structural: Sleep Zakaria's final 2015 SEC exempt-reporting-adviser Form ADV, later cessation of 13F discretion, active Companies House corporate records, and I.G.Y. charity records. Active UK company records do not by themselves indicate current FCA authorization. The Nomad letters also warn that the partnership was not a UK recognised scheme and that investors did not receive the same FSMA or FSCS protections as a regulated UK fund. The absence of surfaced public enforcement is negative public-source evidence, not a legal opinion (SEC Form ADV; SEC Q2 2014 13F cover page; Companies House Sleep Zakaria; Charity Commission I.G.Y. Foundation; approved Nomad letters PDF).

I.G.Y.'s public charity material also deserves two-sided treatment. Its accounts and website support a deliberately low-profile, founder-partner style, but that posture limits outside evaluation of grant process and impact. The Foundation Practice Rating's 2023 table scored IGY Foundation C for diversity, D for accountability, A for transparency, and C overall; that is not litigation or misconduct evidence, but it is a credible third-party governance-practice caveat (I.G.Y. homepage; I.G.Y. What Are We Looking For?; Foundation Practice Rating 2023 results table).

The main interpretive risk is over-copying. Sleep and Zakaria's results depended on a small partnership, aligned capital, unusual patience, unusually concentrated positions, willingness to look inactive, and a temperament that many allocators do not share. The best use of the writings is to learn how they reasoned about systems, incentives, customers, and time, not to clone the last visible portfolio or mistake a famous outcome for a universally scalable recipe.

As of: 2026-07-04T13:25:17Z

Research note: T0314 was a stale retry. No mental-models.md file existed on main; Nick Sleep's H-synthesis had already landed with an explicit dependency warning that the mental-models task was still missing. This reconstruction uses the approved I.G.Y. Foundation archive of the Nomad Investment Partnership letters, the Sleep-signed I.G.Y. essays, company filings, SEC filings, existing A-F files in this folder, and fresh public-record checks. Attribution caveat: the Nomad letters are Sleep/Zakaria co-authored unless a source identifies Sleep alone; the 2021 public version is I.G.Y.-approved but privacy-edited, per I.G.Y.'s own preamble (I.G.Y. preamble; Nomad letters).

Guiding Questions For This Task

• What operating screens made "scale economies shared" different from generic scale or a simple moat label?
• How did Sleep/Zakaria translate destination analysis into buying, sizing, selling, and doing nothing?
• Where did the model break down, especially in financials, illiquids, airlines, and premature sales?
• What parts can an individual investor replicate without Nomad's partnership structure, private ledgers, or co-manager setup?

Named Heuristics & Frameworks

1. Scale Economies Shared

The central Sleep/Zakaria heuristic is that the best businesses can share scale benefits with customers, making the customer proposition better as the company grows, which then attracts more customers and reinforces scale. In the Nomad letters, the model is applied most visibly to Costco, Amazon, Berkshire subsidiaries such as GEICO and Nebraska Furniture Mart, and AirAsia; by the crisis years the managers described these kinds of businesses as a large share of the portfolio (Nomad letters). Sleep's later essay "Short-term vs Long-term" restates the same habit in plainer language: look for long-term systems where a company builds trust by giving more value to counterparties, not by extracting the last possible margin (Short-term vs Long-term).

Operationally, this is not just "big company good." A company passes the test only if scale improves the customer offer and the improved customer offer plausibly feeds back into more scale. Costco's public filings fit the screen: low prices, limited selection, high volume, rapid inventory turnover, operating efficiencies, and membership renewal are part of one model rather than isolated tactics (Costco 2004 10-K; Costco 2024 10-K). Amazon's crisis-era filings and releases showed the other version: price, selection, convenience, third-party sellers, and cash generation could keep improving even when markets were stressed (Amazon 2008 release; Amazon 2023 10-K).

The test has a negative form too: a business with scale but poor reciprocity, extractive pricing, brittle trust, or capital needs that outrun customer surplus is not the same thing. This is where the model prevents simplistic platform worship.

2. Robustness Ratio: Who Gets The Surplus?

Sleep/Zakaria used "robustness ratio" to ask how a company divides benefits among customers, employees, suppliers, and shareholders (Nomad letters). The point was not charity inside a stock pitch. It was an underwriting test: if too much of the system's surplus is captured in reported margin today, the business may invite customer churn, political attack, employee alienation, supplier retaliation, or competition.

The operating question is: "How much value is being reinvested into the ecosystem, and does that make the future business stronger?" Costco's restraint on margins and Amazon's willingness to reinvest in price, selection, logistics, and seller tools were not treated as accounting defects; they were signs that the companies might be building harder-to-replicate customer relationships (Costco 2006 annual report; Amazon 2008 release).

3. Destination Analysis

Destination analysis is the habit of underwriting a probable end-state, rather than reacting to near-term earnings, recent price action, or the label "growth" versus "value." In the Nomad letters, this language appears as a way to evaluate where a business model is heading if its incentives and behavior persist (Nomad letters). A cheap stock with a bad destination is a trap; an expensive-looking stock with a widening customer advantage may be cheaper than it appears.

The model changes valuation order. Instead of starting with a multiple, the analyst first asks what the mature business may look like: customer count, unit economics, reinvestment runway, capital needs, competitive response, management behavior, and probable share count. The multiple is then a translation device, not the central insight.

4. The Terminal Portfolio

Sleep/Zakaria's "terminal portfolio" idea was to imagine the small set of businesses one would be comfortable owning for a very long time, then wait for opportunities to own them at sensible prices (Nomad letters). The terminal-portfolio concept explains the later public 13F concentration in Amazon, Costco, Berkshire, and Liberty Global, while also requiring a caveat: 13F filings show only U.S.-reportable securities, not total NAV, cash, foreign ordinary shares, shorts, or private holdings (Sleep Zakaria Q4 2013 13F; SEC 13F FAQ).

This is not a license to buy three famous stocks forever. It is a forcing device: if a business is not good enough to be a long-term owner candidate, why should it consume scarce attention? If it is good enough, why should a routine mark-to-market decline automatically cause a sale?

5. Inactivity As A Daily Decision

Nomad's low turnover was not framed as laziness. The managers described the 2008-2009 period as involving daily decisions not to sell, because the price-to-value relationship had improved and the underlying businesses still looked sound (Nomad letters). Inactivity, in this model, is an active conclusion reached after re-underwriting the business.

Sleep's later writing gives the psychological condition for this to work: "Patience is a product of confidence and trust" (Short-term vs Long-term). That sentence is short enough to quote, but the more important operational reading is that patience without evidence is stubbornness. The evidence must be refreshed.

6. Partner Fit As A Risk Control

The Nomad letters repeatedly stress the importance of partners who understood the long horizon and could tolerate inactivity, volatility, and concentrated ownership (Nomad letters). This was not client-service color; it was a structural risk control. A portfolio that may fall 45.3% in 2008, on manager-reported numbers, cannot be paired with capital that demands quarterly comfort or daily narrative management (Nomad letters).

The partner-fit lesson also explains why closing Nomad is part of the mental-model record. The I.G.Y. postamble frames the closure around changing regulation, independence, and moving from investment management toward philanthropy and life design (I.G.Y. postamble). A strategy that depends on unusual patience must protect the environment that produces that patience.

7. Risk Is Misanalysis, Not Price Wiggles

Sleep/Zakaria treated volatility as tolerable when the business analysis was intact and dangerous when it obscured permanent impairment. That distinction explains why they could hold Amazon and Costco through severe market stress but sell or avoid situations where leverage, dilution, regulatory capital, or unknowable losses made the denominator unstable (Nomad letters).

The model's strongest risk rule is epistemic: if the investor cannot know the future share count, loss pool, recapitalization terms, or controlling incentives well enough, the apparent discount is not investable.

8. X-Amount And Sufficiency

Sleep's "X-Amount" essay is not a stock-selection model, but it is relevant to agency hygiene. It asks how much wealth is enough before more money stops improving life and starts distorting behavior (X-Amount). In investing-process terms, the lesson is to separate surplus capital from required capital. An investor who knows what is enough is less likely to overtrade, chase status, take leverage, or transform a good strategy into a fee-maximizing enterprise.

Their Decision Checklist Reconstructed In Operational Terms

Screens

1. Start with primary evidence and business behavior. Sleep's later essay pushes long-term investors toward primary data and durable signals, not short-term market noise (Short-term vs Long-term). In practice that means filings, annual reports, letters, pricing behavior, customer proposition, unit economics, and management incentives before commentary.

2. Look for customer-surplus compounding. The analyst should ask whether lower prices, better service, broader selection, higher trust, or improved reliability are getting stronger with scale. Costco's membership warehouse model and Amazon's crisis-period sales/free-cash-flow growth are direct evidence for the screen, not decorative examples (Costco 2004 10-K; Amazon 2008 release).

3. Separate owner-orientation from extraction. High current margins can be good, but the robustness-ratio test asks whether the business is sharing enough value to keep the ecosystem healthy. Berkshire is a different but related branch: decentralized operating businesses, insurance float, and long-duration capital allocation rather than a pure low-price retail flywheel (Berkshire 2013 annual report).

4. Reject opaque financials and solvency-dependent cheapness. Conseco and MBIA are the cautionary cases. Conseco's bankruptcy and common-stock cancellation corroborate the danger of continuing to underwrite a financial company after confidence, ratings, and regulatory capital become part of the survival equation (CNO reorganization release; SEC Conseco proceeding). MBIA showed the related denominator problem: losses and capital issuance can make per-share value unknowable (MBIA 2008 update; MBIA 2008 results).

5. Demand context for foreign, illiquid, or politically exposed holdings. Matichon illustrates the limit: Nomad liked the economics but acknowledged a language boundary, and independent evidence shows the 2005 Thai media-control controversy was politically salient (Nomad letters; IDE Thailand 2006 review; VOA Matichon report).

Valuation And Entry

Sleep/Zakaria's valuation discipline was a price-to-value discipline, not a low-multiple fetish. Early Nomad letters discuss buying at large discounts to estimated value, but later letters show a more mature method: value the destination, not the current accounting snapshot (Nomad letters).

The reconstructed entry checklist is:

• Estimate the business destination: customers, economics, reinvestment runway, capital needs, competitive response, and management behavior.
• Translate that destination into per-share value, using conservative assumptions about share count and reinvestment.
• Require a margin of safety, but do not confuse accounting reinvestment with poor economics.
• Prefer cases where the market is penalizing long-term investment that improves the customer proposition.
• Do not buy when the apparent discount depends on unknowable losses, hidden leverage, regulatory capital, or future dilution.

Sizing Rules

Nomad's sizing cannot be reconstructed completely from public evidence. The letters give manager-reported episodes and public 13F filings show late U.S.-reportable concentration, but those records are not full NAV or trade ledgers (Nomad letters; SEC 13F FAQ). Still, the operating rules are visible:

• Size by knowability and runway, not by headline cheapness. Amazon, Costco, and Berkshire could become large because the managers believed the destination was unusually knowable and attractive.
• Cap positions that require outside capital or control terms you cannot influence. MBIA-like investments can be impossible to size safely if recapitalization terms determine per-share value (MBIA owner letter).
• Respect executable liquidity. Union Cement was attractive but could not become a large position because the shares barely traded; Holcim's later control-block purchase supported value but did not solve Nomad's original execution constraint (Nomad letters; Holcim 2004 annual report).
• Avoid leverage as a substitute for conviction. The letters' risk posture is long-only, owner-oriented, and structurally patient; there is no evidence that the model required financial leverage, synthetic exposure, or forced gross exposure.
• Design capital around drawdown tolerance. Manager-reported 2008 drawdown and low redemptions are evidence for the structure, not a guarantee of downside protection (Nomad letters).

The visible 13F evidence supports the concentration story but must be used narrowly. Sleep Zakaria's Q4 2013 13F was highly concentrated in Amazon, Costco, Liberty Global, and Berkshire A; its Q2 2014 filing stated the firm no longer exercised investment discretion over 13F securities and would not file going forward (Sleep Zakaria Q4 2013 13F; Sleep Zakaria Q2 2014 13F). That is evidence of U.S.-reportable concentration, not proof of total portfolio composition or investor-level returns.

Sell Rules

Sleep/Zakaria's sell discipline is easier to see in mistakes than in triumphs.

1. Do not sell simply because the first discount closed. Stagecoach was the central regret: Nomad sold after a large gain, then later judged that the improved business destination made the sale premature (Nomad letters). Stagecoach's public reports support the idea that the company was changing: debt reduction, restructuring, disposals, and operational recovery were visible in the 2003 and 2005 reports (Stagecoach 2003 annual report; Stagecoach 2005 annual report).

2. Sell when per-share value becomes unknowable. MBIA is the clearest case. If future losses and future capital issuance determine the ultimate per-share value, a minority outside investor cannot anchor on book value alone (Nomad letters; MBIA 2008 update).

3. Sell or avoid when survival depends on fragile external confidence. Conseco's combination of financing assets, securitization losses, ratings pressure, and capital weakness turned cheapness into a solvency question (CNO reorganization release; SEC Conseco proceeding).

4. Do not sell for illiquidity alone if illiquidity was part of the underwriting. Matichon shows the other side: Nomad resisted a low bid despite institutional pressure, because liquidity discomfort was not the same as thesis failure (Nomad letters).

5. For trust businesses, sell the broken response, not merely the shock. Nomad's AirAsia discussion distinguished operating adversity from a management response that would destroy trust. Independent aviation coverage around 2008 shows real fuel, currency, and expansion risks, so the rule cannot be reduced to "ignore macro" (Aviation Strategy, March 2008; Aviation Strategy, February 2009).

Risk Limits

The reconstructed risk limits are:

• No leverage or forced exposure is required for the model.
• No large position where the analyst cannot underwrite the balance sheet, share count, and control incentives.
• No "cheap" financial unless capital needs, loss pools, and regulatory/rating triggers are understandable.
• No position sized as though liquidity exists when actual float and daily trading say otherwise.
• No reliance on public 13F as a full portfolio map.
• No patience without evidence: every "do nothing" decision should be a re-underwriting decision.
• No client base whose horizon conflicts with the portfolio's drawdown profile.
• No claim of public legal/regulatory cleanliness beyond what was actually checked.

Current public-record checks found no clear SEC, FCA, Charity Commission, or litigation red flag tied to Nick Sleep, Sleep Zakaria & Company, Nomad Investment Partnership, or I.G.Y. Foundation as of this timestamp, but this is negative evidence, not a legal conclusion. Companies House lists Sleep, Zakaria and Company, Ltd. as active; the Charity Commission lists I.G.Y. Foundation with Nick Sleep as chair; and the 2015 SEC ADV file records Sleep Zakaria as an exempt reporting adviser with FCA registration withdrawn (Companies House, Sleep Zakaria; Charity Commission, I.G.Y. Foundation; SEC ADV, Sleep Zakaria; FCA register overview).

Failure Modes Of The Model

Hindsight Storytelling

The greatest risk in studying Sleep is turning a hard process into a tidy story: "buy Amazon, Costco, and Berkshire, then wait." That reverses the evidence. The letters show years of global searching, mistakes, illiquid holdings, non-U.S. situations, and crisis drawdowns before the portfolio became publicly legible through a few 13F names (Nomad letters; SEC 13F FAQ).

Mistaking A Slogan For An Underwriting Edge

"Scale economies shared" is easy to repeat and hard to underwrite. Many companies claim customer obsession, low prices, network effects, or long-term reinvestment. The model fails if the analyst does not verify that customers really receive value, that unit economics improve with scale, that competitors cannot match the giveback, and that management will keep sharing surplus when it has the option not to.

Over-Transfer To Capital-Intensive Cyclicals

AirAsia may have had scale-sharing characteristics, but it also faced fuel, currency, financing, safety, and capacity risks. The right lesson is not that all low-cost carriers are compounders. The lesson is that operating evidence must beat macro fear while still respecting the capital structure and trust boundary (Aviation Strategy, March 2008; AirAsia 2008 annual report).

Cheap Financials With Unknowable Denominators

Conseco and MBIA are the sharpest anti-model cases. Both demonstrate that apparent value can disappear if the investor cannot know the loss pool, rating/capital consequences, recapitalization price, or future share count (CNO reorganization release; MBIA 2008 update).

Premature Sale After A Successful Re-rating

Stagecoach shows that selling a winner after the market recognizes part of the value can still be an error if the business destination has improved. The model requires re-underwriting the forward business, not simply celebrating a gain (Nomad letters; Stagecoach 2005 annual report).

Illiquidity And Capacity

Union Cement shows that expected return and executable size are different variables. A tiny, brilliant idea may not matter if the fund cannot buy enough shares. The more undervalued and obscure a security becomes, the harder it may be to source supply from willing sellers (Nomad letters; Holcim Q3 2004 report).

Political, Language, And Local-Control Gaps

Matichon illustrates an underappreciated limit. Nomad's economic analysis had to coexist with Thai language limits and political/control uncertainty. For an outside investor, local product quality and governance culture may be partly invisible without trusted local checks (Nomad letters; IDE Thailand 2006 review).

Client And Vehicle Friction

Nomad's model depended on unusually patient partners. If the vehicle has daily liquidity, benchmark pressure, fee pressure, or a marketing machine that needs constant activity, the same analytical ideas may degrade into performance theater. The closure of Nomad and Sleep's later I.G.Y. work are reminders that structure and personal incentives are part of the method (I.G.Y. postamble; X-Amount).

Source Opacity

Public students of Sleep face real evidence limits. The Nomad letters are manager-authored and privacy-edited; exact costs, position weights, internal valuations, investor-level returns, and non-U.S. holdings are not fully public. Later I.G.Y. 13Fs, including the 2026 visible Amazon/Costco/Berkshire book, are useful evidence of later behavior but not proof of the original Nomad fund's full portfolio or Nick Sleep's personal net worth (I.G.Y. preamble; SEC 13F FAQ).

Transferability: What Individual Investor Can And Cannot Replicate

What Can Be Replicated

An individual investor can replicate the questions better than the portfolio.

• Primary-source discipline. Read filings, letters, annual reports, transcripts, and regulator records before reading admiration pieces. Sleep's own later essay favors primary data and long-horizon evidence (Short-term vs Long-term).
• Customer-surplus checklist. Ask whether scale makes the customer proposition better, whether the company keeps sharing value, and whether competitors can copy the giveback.
• Destination analysis. Write the likely five-to-ten-year destination before writing the valuation output.
• Robustness ratio. Identify who benefits from the business model and whether the distribution of surplus strengthens the ecosystem.
• Sell pre-mortem. Before buying, list what would make per-share value unknowable: dilution, leverage, loss pools, regulatory capital, governance change, language gaps, or loss of trust.
• Inactivity protocol. Replace "I am doing nothing" with "I re-underwrote the thesis and chose not to sell."
• No leverage. The public Sleep record does not require leverage for success; an individual can keep the same constraint.
• Attention discipline. Keep a terminal-portfolio watchlist of excellent businesses and wait for valuation dislocations.
• Sufficiency discipline. Use the X-Amount idea to avoid turning investing into status competition (X-Amount).

What Cannot Be Fully Replicated

Several parts of the Nomad environment are not portable.

• The exact portfolio path. Amazon, Costco, Berkshire, Liberty Global, AirAsia, Stagecoach, Matichon, Union Cement, and other situations came from a specific historical opportunity set. Copying the final visible 13F misses the process that created it.
• Private partnership alignment. Nomad's LP base, reporting cadence, and closure option cannot be reproduced by every individual or public-fund manager.
• Co-manager judgment. The public record is Sleep/Zakaria co-authored; an individual studying Nick Sleep alone should not erase Qais Zakaria's role (Nomad letters).
• Global sourcing and execution. Some gains and mistakes came from less trafficked non-U.S. securities where local knowledge, liquidity, tax, custody, and political context mattered.
• Exact economics. Public evidence does not reveal full costs, sizes, realized P&L, cash levels, foreign holdings, private vehicles, or investor-level outcomes.
• Temperament under career pressure. An individual can choose patience, but professional managers face business risk, redemptions, rankings, and client demands. Nomad's structure was part of the edge.
• Legal/regulatory certainty. Public checks can reduce obvious red-flag risk, not prove the absence of every issue.

A Practical Adaptation Checklist

For an individual investor, the Sleep/Zakaria model can be adapted into a checklist:

1. What is the company's customer promise, and is it improving because of scale?
2. Who gets the surplus: customers, employees, suppliers, managers, or shareholders?
3. What is the likely destination if today's incentives persist?
4. What evidence comes from primary sources rather than commentary?
5. How could the denominator change through dilution, losses, recapitalization, or leverage?
6. What would prove that management had broken trust?
7. What position size can be held through a 40%-plus mark-to-market decline without forced selling?
8. Is liquidity real enough for the desired size?
9. What is the sell rule before the stock goes up or down?
10. Is the investor copying a famous final portfolio, or reproducing the underlying evidence process?

The highest-quality transfer is behavioral and analytical, not mimetic. Sleep's public record points toward fewer, better-understood businesses; patient capital; skepticism toward cheapness without knowability; and respect for customer trust. The non-transferable parts are equally important: private ledgers are missing, 13F data is incomplete, the letters are curated first-party material, and the best-known portfolio names were the outcome of a long process rather than the process itself.

As of: 2026-07-04T10:25:52Z

Evidence note

This synthesis is based on completed Nick Sleep Canon files A-F, fresh primary checks, and the five research lanes run for T0315. The dependency gap is explicit: T0314 mental-models.md was still freshly claimed and unavailable on main when this H task closed, so decision-checklist and transferability conclusions below are reconstructed only from profile, philosophy, trades, mistakes, own-words, key-writings, source-map, and primary records. Refresh this file after T0314 lands.

The core investment record evidence remains manager-authored and co-authored by Nick Sleep and Qais Zakaria. The approved public source for the Nomad letters is I.G.Y. Foundation's site, whose preamble says earlier copies circulated without approval and that the public PDF was lightly privacy-edited (I.G.Y. preamble; approved Nomad letters PDF). Treat the letters as excellent process evidence, good but self-reported return evidence, and incomplete trade-ledger evidence.

Executive brief

Nick Sleep's place in the Canon is not "the investor who bought Amazon and Costco." It is the investor who converted a global value partnership into a patient ownership system for rare businesses that shared scale benefits with customers. Nomad began with bargain hunting, capital-cycle thinking, and global neglected securities, then evolved toward what Sleep and Zakaria called "destination" analysis: underwrite where the business system can go if its culture, customer proposition, reinvestment, and scale advantages keep compounding (investment philosophy file; Nomad letters).

The reported record was exceptional. From 10 September 2001 through 31 December 2013, Nomad reported +921.1% cumulative return before performance fees, +18.4% annualized after fees, versus +6.5% annualized for MSCI World Net USD. Those figures come from the letters rather than a public audited database, and investor-specific results could differ by subscription timing, fees, currency, and vehicle (profile file; Nomad letters). Still, the record is directionally supported by visible late-stage holdings: Sleep, Zakaria's Q4 2013 13F showed Amazon, Costco, Berkshire Hathaway, and Liberty Global as the main U.S.-reportable positions, while the Q2 2014 13F said the firm no longer exercised investment discretion over 13F securities after the wind-down (SEC Q4 2013 13F text; SEC Q2 2014 13F cover). A 13F is only a U.S. long-equity snapshot, not a full portfolio, AUM, cost basis, cash, short, tax, or realized-P&L record (SEC 13F FAQ).

Sleep's best evidence is the fit between thesis and behavior. Amazon and Costco were not merely cheap; they used scale to lower prices, improve service, increase loyalty, and deepen the moat. Costco filings from the early 2000s show the low-margin, high-renewal membership economics that made the thesis testable, and Amazon's 2008 results showed growth and cash generation through crisis conditions (Costco 2002 10-K; Costco 2004 10-K; Amazon 2008 release). The same frame also explains why Stagecoach became a profitable mistake: Nomad sold after the original value gap closed, then concluded that the better lesson was to re-underwrite the destination rather than sell a compounding system just because the first appraisal had worked (greatest trades file; mistakes file).

The anti-hagiography matters. Nomad fell -45.3% in 2008 versus -40.7% for MSCI World in the same table, then rebounded strongly in later years; the lesson is not downside protection, but capital-duration fit and the ability to hold a concentrated portfolio through mark-to-market pain (Nomad letters). Conseco, MBIA, AirAsia, Matichon, and Union Cement show the limits: cheapness can be swamped by leverage or unknowable per-share value; a "scale shared" pattern can be harder in capital-intensive cyclicals; local politics and illiquidity can dominate; and a correct small-cap idea that cannot be sized may barely move the fund (mistakes file; MBIA 2008 results; Holcim Q3 2004 report).

Sleep's final act is also part of the edge. Nomad was closed and capital was returned rather than converted into an asset-gathering machine. The 2021 I.G.Y. postamble says regulation, independence, and the sense that the process had become repeatable contributed to closure, while also admitting that selling the portfolio "felt wrong" (I.G.Y. postamble). After Nomad, Sleep's public footprint moved toward I.G.Y. Foundation and personal/company vehicles. As of this run, Charity Commission records list I.G.Y. Foundation as up to date, Sleep as chair, and the year ended 31 March 2025 with income of GBP106,025 and expenditure of GBP4,992,764; Companies House lists I.G.Y. Limited and Sleep, Zakaria and Company, Ltd. as active (Charity Commission full print; I.G.Y. Limited Companies House; Sleep Zakaria Companies House).

The transferable core is powerful but narrow: learn to identify customer-first compounding systems, appraise them over long horizons, size only what you can understand and endure, and build a capital base that lets inactivity become an edge. The non-transferable parts are just as important: the co-manager partnership with Qais Zakaria, private-fund client selection, early sourcing, willingness to hold a terminal portfolio, wealth sufficiency, and a rare period in which Amazon, Costco, and Berkshire all compounded beautifully.

10 transferable lessons, ranked

1. Underwrite the destination, not the snapshot. Sleep's most portable analytical move is to ask what a business system can become if incentives, culture, customer behavior, and reinvestment keep compounding. That is why the mature Nomad letters moved beyond low multiples into Amazon, Costco, Berkshire/GEICO, and other companies where today's earnings understated future destination value (investment philosophy file; Nomad letters).

2. Look for scale economies shared with customers. Generic scale can become complacency or monopoly extraction. Sleep's better test was whether scale savings were recycled into lower prices, better service, and stronger customer trust. Costco's low margins and membership renewal economics, Amazon's customer proposition, and GEICO's low-cost insurance model all fit this pattern (Short-term vs Long-term; Costco 2004 10-K; greatest trades file).

3. The rare great business deserves a different sell discipline. Stagecoach taught Nomad that selling simply because the initial discount closed could be a larger error than holding through volatility. The right question is not "has it reached my old target?" but "has the destination changed, and is the current price still wrong enough?" (mistakes file; Nomad letters).

4. Inactivity is an output of work, not a personality pose. Nomad's later edge came from research strong enough to support long visible inactivity. Holding Amazon and Costco through price moves required prior understanding, explicit partner communication, and a client base that could tolerate boredom and fear (in their own words file; Nomad letters).

5. Partner fit is risk management. A long-duration strategy can be destroyed by short-duration capital. Nomad's warnings about concentration, volatility, and unsuitable short-horizon investors were not marketing footnotes; they were part of the investment process (investment philosophy file; profile file).

6. Price discipline survives the quality turn. Sleep did not abandon value investing. He lengthened the appraisal period. The lesson is not to buy famous compounders at any price, but to estimate future free cash flow, durability, and reinvestment runway better than a market focused on current margins or current multiples (investment philosophy file; key writings file).

7. Capacity is part of the thesis. Union Cement appears to have been analytically right but too small and illiquid to matter much. A fivefold idea that can only become a tiny position is not the same portfolio asset as a scalable compounder that can absorb capital (greatest trades file; Holcim Q2 2004 report).

8. Avoid false precision in opaque financials. Conseco and MBIA set the boundary around cheapness. When leverage, credit loss estimates, dilution, recapitalization, or accounting complexity make per-share value unstable, the apparent discount may be an illusion (mistakes file; ALTA on Conseco bankruptcy; MBIA 2008 results).

9. Closure can be rational capital allocation. Nomad's wind-down is a governance lesson. Sleep and Zakaria chose not to maximize asset-management enterprise value once the structure no longer fit their desired life, regulation, independence, and purpose. This is rare, and it also creates a large opportunity-cost question because the sold businesses kept compounding (I.G.Y. postamble; profile file).

10. Define sufficiency before success distorts the game. I.G.Y.'s "X-Amount" idea reframes wealth as a threshold beyond which additional capital should be separated and redeployed with purpose. For investors, this is not sentimental; it changes risk appetite, fee incentives, client selection, and the willingness to stop (X-Amount; I.G.Y. Foundation).

Style taxonomy tags

• Concentrated global quality compounding
• Evolved value investor
• Scale economies shared with customers
• Destination analysis
• Patient ownership / low turnover
• Long-only public equities
• Capital-cycle influence
• Customer-value flywheels
• Primary-data and first-principles research
• Benchmark-agnostic absolute return
• Partner-fit / private-fund structure
• Anti-leverage and anti-financial-engineering bias
• Capacity and liquidity discipline
• Self-reported record / 13F-opacity caveat
• Wealth sufficiency and post-fund philanthropy

Regime dependence

Sleep's mature method works best when markets underprice duration. The ideal setup is a business whose current earnings look ordinary or depressed because management is deliberately sharing scale benefits with customers, but whose customer trust, unit economics, and reinvestment runway can make future value much larger. Low portfolio turnover, private-client patience, and low leverage give the investor time to let that gap close. Amazon in the late 2000s and Costco in the early 2000s were unusually fertile examples because both companies were using customer value as a strategic weapon while many investors still penalized low margins or reinvestment (Amazon 2008 release; Costco 2002 10-K; Short-term vs Long-term).

The strategy struggles when valuation already capitalizes perfection, when business destination is unknowable, or when financing conditions matter more than customer reciprocity. MBIA looked statistically cheap but credit loss, dilution, and capital-structure uncertainty made per-share value too hard to estimate. AirAsia suggested that sharing scale with customers can be harder to translate in airlines, where fuel, capacity, regulation, and cyclicality can dominate. Matichon shows political and local-governance risk; Union Cement shows that correct analysis without liquidity can be economically minor (mistakes file; APO Matichon/GMM report; Holcim Q3 2004 report).

The vehicle regime is equally important. Nomad could look very wrong for long stretches because its capital was selected and educated for that possibility. The 2008 drawdown proves that the method did not avoid market pain; it survived pain because the business thesis, client base, and managers' own capital allowed patience. That makes the method dangerous for investors who copy the visible holdings through delayed 13Fs without copying the vehicle, research, sizing, cash needs, and temperament (Nomad letters; SEC 13F FAQ).

The closure regime is the final nuance. Nomad's best businesses continued compounding after the fund closed, and I.G.Y.'s own postamble says liquidation felt wrong. A pure compounding-maximizer might have sought permanent capital or a family-office-style continuation. Sleep and Zakaria instead prioritized independence, regulation, repetition, and sufficiency. That decision is coherent with the life philosophy but complicates claims that the investment process was simply "buy and never sell" (I.G.Y. postamble; X-Amount).

Closest and most-opposite investors already in repo

Closest: Charlie Munger. Munger is the closest temperament and philosophy analogue: business quality over statistical cheapness, simple ideas taken seriously, inactivity, incentives, and anti-agency thinking. Sleep's method feels like Munger's quality-value doctrine translated into a private global equity partnership.

Also close: Warren Buffett. Buffett is the main ancestor through business-owner thinking, Berkshire/GEICO, quality compounding, and patience. The structural difference is crucial: Buffett had permanent capital, insurance float, tax deferral, and control optionality; Sleep had a redeemable partnership that eventually returned capital.

Also close: Terry Smith. Smith is the closest public-fund analogue. Both prefer high-quality businesses, low turnover, and compounding over activity. Smith is more accounting-forensic and formulaic around cash returns; Sleep is more destination-analysis and customer-system oriented, and his partnership closed rather than becoming a mass public franchise.

Also close: Li Lu. Li Lu shares the Buffett-Munger lineage, concentration, private partnership structure, and long-horizon quality value. The difference is domain and framing: Li Lu is more China/Asia and civilization-level in his opportunity set; Sleep is more customer-value flywheel and scale-sharing focused.

Near miss: Mohnish Pabrai. Pabrai is close by cloning discipline, concentration, Dhandho downside focus, and public admiration for Sleep. He is a near miss rather than the closest peer because his documented edge leans more toward dislocation, cyclicals, cloning, and special-situation value than Sleep's mature terminal-portfolio compounding model.

Most opposite: Jack Bogle. Bogle is the philosophical opposite because he argued that broad, low-cost market ownership is the rational default when active edge is rare. Sleep's record argues that concentrated active ownership can win when the investor identifies rare systems and has the patience to hold them. Both dislike needless trading and fees; they draw opposite conclusions from that humility.

Most opposite in method: Jim Simons. Simons' edge is statistical, high-volume, model-driven, and detached from business narrative. Sleep's edge is qualitative, sparse, owner-minded, and built around incentives, customers, culture, and time.

Most opposite in operating style: George Soros and Stanley Druckenmiller. Soros and Druckenmiller are concentrated like Sleep, but the concentration is liquid macro, reflexive, reversible, and price-feedback sensitive. Sleep's concentration is long-term business ownership designed to ignore most price feedback.

Most opposite in fundamental orientation: Jim Chanos. Chanos studies businesses to find decay, accounting strain, fraud, and negative optionality. Sleep studies businesses to find customer trust, shared scale, and positive optionality. Both care about business reality, but they aim the research process in opposite directions.

Luck vs skill

The skill component is real. The letters show a repeated pattern: identify a business system, check whether customer value and scale reinforce each other, avoid financial structures where per-share value is unknowable, communicate honestly with partners, and hold through discomfort when the thesis remains intact. Amazon, Costco, Berkshire/GEICO, and Stagecoach are not random tickers in retrospect; they sit inside a coherent learning loop from cheapness toward duration and quality (Nomad letters; greatest trades file; mistakes file).

The luck and path dependence are also real. The largest visible outcomes came from owning extraordinary compounders during a period when those businesses became much larger and more admired. Sleep and Zakaria themselves cautioned that managers mostly catch better waves rather than create the wealth. Public evidence still does not provide exact position-level P&L, average cost, full non-U.S. holdings, full AUM, or audited LP-level returns. The late 13Fs are useful clues, not the ledger (SEC Q4 2013 13F text; SEC 13F FAQ).

The best synthesis is that Sleep's edge was behavioral and structural as much as analytical. Many investors can repeat the phrase "scale economics shared"; few can identify the rare cases early enough, buy enough, avoid overpaying, survive a -45% year, resist action after a stock doubles, and stop the asset-management game after success. That whole system, not a single stock pick, is the durable lesson.

Unresolved questions

• Refresh after T0314 mental-models.md closes. This file should inherit any sharper checklist, mental model taxonomy, or process reconstruction from that task rather than treating A-F reconstruction as final.
• Obtain audited partnership statements, schedules of investments, offering documents, or LP letters that verify investor-level returns, fees, AUM, cash, non-U.S. holdings, and realized/unrealized P&L.
• Separate Nick Sleep's individual contribution from Qais Zakaria's contribution. The Nomad letters and record are co-authored and co-managed unless a source specifically attributes a view to one person.
• Verify exact trade economics for Amazon, Costco, Stagecoach, Union Cement, Matichon, AirAsia, Conseco, and MBIA. The current record supports process and broad outcomes better than exact dollar P&L.
• Deepen legal/regulatory checks across FCA, SEC, Cayman/offshore vehicle records, UK Companies House filings, Charity Commission filings, and litigation databases. Current primary checks found no high-confidence enforcement red flag, but this is not a full legal opinion (SEC ADV; FCA Register overview).
• Clarify the relationship between I.G.Y. Foundation, I.G.Y. Limited, post-Nomad 13F filings, and any charitable funding or personal-investment vehicles. These should not be treated as a continuation of Nomad's public performance record without direct evidence (I.G.Y. Limited Companies House; Charity Commission full print).
• Re-check the forthcoming print edition of The Nomad Letters after official publication. Current metadata conflicts should not be used for page citations or unavailable-book claims (key writings file).

Started for Task A-profile on 2026-07-03T23:58:44Z.

Ranked source map

1. I.G.Y. Foundation, approved Nomad Investment Partnership letters PDF - Core primary source for the profile: launch date, semiannual letters, investment evolution, performance tables, fee discussion, legal footnotes, mistakes, portfolio examples, and the final 2013 record. Use this approved version over bootleg copies.
2. I.G.Y. Foundation preamble - Official provenance statement for the 2021 publication of the letters. Useful for the date range, privacy edits, approved-source preference, and the stated evolution from cigar-butt investing to near-permanent holdings.
3. I.G.Y. Foundation postamble - Best first-party source for why Nomad closed: regulation, the burden of justifying action and inaction, the feeling that the investment process had been fully mined, and the pull toward independence and philanthropy.
4. I.G.Y. Foundation homepage - Concise first-party source connecting Nick Sleep, Qais Zakaria, Nomad profits, and the creation of I.G.Y. as Nick Sleep's charitable foundation.
5. I.G.Y. Foundation, "Short-term vs Long-term" - Key first-party post-Nomad philosophy source for customer-first compounding, primary-data / first-principles thinking, patience, trust, and "scale economics shared."
6. I.G.Y. Foundation, "X-Amount" - First-party source for Sleep's post-investing view of sufficiency, wealth, identity, and philanthropy after investment success.
7. I.G.Y. Foundation, "Our Guiding Principles" - First-party source for I.G.Y.'s allocation principles: quiet/rational capital reallocation, long-term impact, low profile, own work, and rational fact-based discussion.
8. Companies House, Sleep, Zakaria and Company overview - Primary corporate source for incorporation date, active status, registered office, SIC code, and previous company names.
9. Companies House, Sleep, Zakaria and Company officers - Primary source for Sleep and Zakaria as active officers, Sleep's month/year of birth, nationality, residence, and 10 April 2006 appointment date.
10. Companies House, Nicholas David Mark Sleep appointments - Primary source for Sleep's active I.G.Y. Limited and Sleep Zakaria appointments plus resigned youth-charity roles.
11. Companies House, I.G.Y. Limited overview - Primary corporate source for I.G.Y. Limited's incorporation date, active status, registered office, accounts dates, and SIC 64991 security dealing on own account.
12. Charity Commission, I.G.Y. Foundation full register - Primary source for charity number 1155564, CIO registration, Nick Sleep as chair from 18 December 2013, trustee remuneration status, and 2025 income/expenditure.
13. SEC 13F cover page, Sleep Zakaria, 30 June 2014 - Primary closeout filing showing Sleep Zakaria no longer exercised investment discretion over 13F securities and would stop filing future holdings reports.
14. SEC 13F information table, Sleep Zakaria amendment, 30 September 2013 - Primary filing evidence for late Nomad U.S.-reportable concentration in Amazon, Costco, Berkshire Hathaway Class A, and Liberty Global Class A; useful but not full AUM.
15. SEC Form ADV, Sleep Zakaria & Company Ltd., 2015 snapshot - Primary U.S. adviser-record source for CRD 159933, SEC file 802-75321, London principal office, and withdrawn FCA registration field. Use as regulatory identity evidence, not as performance evidence.
16. SEC 13F cover page, I.G.Y. Limited, Q1 2026 - Current primary filing tying I.G.Y. Limited, Burnsall Street, and N. Sleep as director to a U.S. 13F report for the quarter ended 31 March 2026.
17. SEC 13F information table, I.G.Y. Limited, Q1 2026 - Current primary source for I.G.Y. Limited's 2026 U.S.-reportable holdings in Amazon, Berkshire Hathaway Class A, and Costco with total reportable value of about USD 235.3m.
18. SEC TIFF filing, 2007 - External primary-ish corroboration for Sleep's Marathon tenure and the Nomad Investment Company description; useful for biography and vehicle cross-checking.
19. SEC TIFF prospectus supplement, 2008 - External fund-document source describing Nomad Investment Company Ltd. as a concentrated global long-only equity vehicle; useful vehicle corroboration.
20. Kyobo author biography for Nick Sleep - Secondary biography source for education and early-career sequence; useful only with caveat until primary biography or direct interview confirmation is found.
21. Colossus Founders episode #364 page - Secondary narrative source for Sleep/Zakaria background and partnership design, largely downstream of William Green and the letters. Use as context, not as authority for hard facts.
22. Google Books metadata for William Green, Richer, Wiser, Happier - Bibliographic support for a major secondary source recommended by Sleep/Zakaria in the I.G.Y. postamble; profile claims should be page-checked before relying on it.
23. Hosking Partners, "The Capital Cycle Way" - Useful secondary context for the Marathon/Hosking capital-cycle tradition that shaped Sleep's early formation; not a primary source for Nomad returns.
24. Investment Masters Class, "Learning from Nicholas Sleep" - Practitioner synthesis that helps locate themes and letter passages, but should be treated as a guide back to the primary letters.
25. Morgan Stanley / Michael Mauboussin, "Birth, Death, and Wealth Creation" - Independent institutional context for concentration, long-horizon compounding, and wealth creation; useful for later synthesis but not necessary for core biographical facts.

Task A caveats

• The approved Nomad letters are the dominant source, but they remain a republished, privacy-edited letter archive rather than a public audited fund-record database.
• The famous +921.1% cumulative Nomad figure is before performance fees. The final table's 18.4% annualized figure is after performance fees for an inception investor, but individual net results varied by subscription date.
• Public AUM was not primary-verified. 13F values are U.S.-reportable long holdings, not full assets, not NAV, and not total economic exposure.
• Education, early jobs, and some pre-Marathon biographical details are secondary and need page-level or primary verification.
• The current I.G.Y. Limited 13F should not be treated as Nick Sleep's personal net worth, foundation assets, or post-Nomad fund performance.
• Public legal/regulatory searches found no surfaced SEC/FCA/litigation red flag for Sleep, Zakaria, Sleep Zakaria, or Nomad, but this was a public-web and official-source sweep, not a full legal opinion.
• Value Investor Insight's 2005 Costco interview, FT coverage, and some circulating Nomad PDFs were not used as core authorities because available copies were paywalled, mirrored, or otherwise not clean primary sources in this run.

Task B - investment philosophy sources (2026-07-04T00:13:22Z)

26. IGY Foundation: Nomad Partnership Letters landing page - Official first-party archive for the approved Nomad letters; use this page and the IGY-hosted PDF rather than bootleg copies.
27. IGY Foundation: Preamble - First-party provenance note explaining that the letters were originally private, later approved for publication, lightly edited mainly for privacy, and should be attributed to the IGY version.
28. IGY approved Nomad letters PDF, 2001-2014 - Core primary source for Sleep/Zakaria's philosophy, process, performance table, portfolio evolution, mistakes, and closure narrative.
29. IGY alternate Nomad letters PDF, 2001-2014 - Alternate IGY-hosted PDF copy used to cross-check pagination/text where search results pointed to this file.
30. IGY Foundation: Postamble - First-party explanation of the wind-down: liquidation, return of capital, regulation, discomfort with ongoing justification, and desire for independence/philanthropy.
31. IGY Foundation: Short-term vs Long-term - First-party post-Nomad note useful for psychology, primary data, win-win orientation, quality, patience, and long-term framing.
32. Bishop Rock mirror: Nomad 2001 interim/annual letter - Near-primary mirror of the inaugural letter; useful for early global value criteria, absolute-return orientation, cash patience, and detective-work research language.
33. Bishop Rock mirror: Nomad 2003 annual letter - Near-primary source for explicit rejection of leverage, shorts, derivatives, CFDs, synthetics, and financial engineering.
34. Bishop Rock mirror: Nomad 2004 annual letter - Near-primary source for rejecting crude growth/value labels and defining valuation through future free cash flow.
35. Bishop Rock mirror: Nomad 2004 interim letter - Near-primary source introducing the "terminal portfolio" idea and the shift toward long-duration compounding businesses.
36. Bishop Rock mirror: Nomad 2006 annual letter - Near-primary source for benchmark rejection, circle-of-competence risk, and over-diversification critique.
37. Bishop Rock mirror: Nomad 2008 interim letter - Near-primary source for MBIA sell discipline, dilution/per-share value uncertainty, and position-sizing limits where Nomad could not recapitalize a business.
38. Bishop Rock mirror: Nomad 2012 annual letter - Near-primary source for investor-fit warnings around concentration, volatility, time horizon, and principal-agent mismatch.
39. SEC AdviserInfo Form ADV: Sleep Zakaria & Company Ltd, CRD 159933, filed June 29, 2015 - Primary regulatory source identifying Sleep Zakaria, SEC exempt-reporting-adviser file 802-75321, Qais Zakaria signature, and withdrawn FCA registration note.
40. SEC 13F cover: Sleep, Zakaria & Co Ltd, Q1 2014 - Primary source for the late public U.S. reportable sleeve value of $1.499591 billion and included Nomad manager reference.
41. SEC 13F table: Sleep, Zakaria & Co Ltd, Q1 2014 - Primary source for reported Amazon, Costco, Berkshire Hathaway A, and Liberty Global holdings; 13F incompleteness caveat applies.
42. SEC 13F cover: Sleep, Zakaria & Co Ltd, Q2 2014 - Primary source stating the firm no longer exercised investment discretion over 13F securities and would stop filing holdings reports.
43. SEC filing detail: Nomad Investment Partnership LP, 2014 - Primary SEC index useful for distinguishing Nomad Investment Partnership LP from Sleep Zakaria as reporting manager.
44. Companies House: Sleep, Zakaria and Company Ltd - Official UK company status, incorporation date, active status, accounts date, SIC code, and name history; Companies House accuracy caveat applies.
45. Companies House: Nicholas David Mark Sleep appointments - Official source for Sleep's active directorships in Sleep Zakaria and I.G.Y. Limited plus date of birth month/year.
46. Companies House: Sleep Zakaria officers - Official source confirming active officers/directors including Nicholas Sleep and Qais Zakaria.
47. Companies House: I.G.Y. Limited - Official source for Sleep's post-Nomad investment-related company incorporated in March 2014.
48. Charity Commission: IGY Foundation, charity number 1155564 - Official charity status, activities, trustee list, income/expenditure, and Nick Sleep chair role.
49. SEC 13F cover: I.G.Y. Limited, Q1 2026 - Current public regulatory filing for I.G.Y. Limited signed by N. Sleep; 13F incompleteness caveat applies.
50. SEC 13F table: I.G.Y. Limited, Q1 2026 - Current public table showing Amazon, Berkshire Hathaway A, and Costco with reported value around $235.3 million.
51. Costco 2002 Form 10-K - Primary company source corroborating the low-price, limited-selection, warehouse-membership economics that made Costco a scale-economies-shared case.
52. Aviation Strategy: AirAsia, March 2008 - Independent industry source for AirAsia opportunity and risk context during Nomad ownership; useful counterweight to manager optimism.
53. Aviation Strategy: AirAsia, February 2009 - Independent industry source for AirAsia expansion, downturn, fuel/competition, and operating-risk context.
54. ASU summary: Hendrik Bessembinder, "Do Stocks Outperform Treasury Bills?" - Research context for why hunting for extreme long-term winners can be rational yet hard to replicate.
55. Mauboussin and Callahan: Understanding the Paradox of Skill - Research context for skill-versus-luck framing in a competitive field.
56. Acquirer's Multiple: Value After Hours S08E01 transcript, 2026 - Practitioner critique of copying famous investors without matching strategy, skill, temperament, and opportunity set.
57. MOI Global: Mohnish Pabrai on lessons from Nick Sleep, 2021 - Secondary/practitioner lead on Sleep's concentration and lessons; useful only as interpretive context because core evidence should remain the letters and filings.
58. Quartr: Nomad's Costco investment - Secondary walkthrough of Costco passages; useful as a reading guide but not a substitute for Nomad letters and Costco filings.
59. Investment Masters Class: Learning from Nicholas Sleep - Secondary analysis of terminal portfolio and scale-economies-shared themes; useful for triangulation, not primary evidence.

Negative search log for Task B

• Searched SEC enforcement/litigation, FCA final-notice/news, Justia, Casetext, CourtListener, and broad web queries for "Sleep Zakaria", "Sleep, Zakaria & Co", "Nomad Investment Partnership", "Nick Sleep" with lawsuit, litigation, enforcement, sanction, fine, criticism, luck, and survivorship terms.
• No credible public SEC enforcement, FCA final notice, or litigation result tied to Nick Sleep, Qais Zakaria, Sleep Zakaria and Company Ltd, or Nomad Investment Partnership was found in the reviewed sources as of 2026-07-04.
• Caveat: this is a public-web and official-register check, not a full legal opinion; "no result found" is negative evidence rather than proof of absence.

Task C - greatest-trades sources (2026-07-04T01:37:27Z)

60. IGY approved Nomad letters PDF, 2001-2014 - Core primary source for Amazon, Costco, Stagecoach, Berkshire/GEICO, AirAsia, Matichon, Union Cement, performance path, 2008 drawdown, closure-era portfolio language, and trade-level caveats.
61. IGY Foundation: Postamble - First-party source for liquidation and return of partner funds a few months after the December 2013 letter; important for exit limitations.
62. SEC Form 13F FAQ - Primary regulatory context for what 13F does and does not show; used to caveat all late holding percentages.
63. Sleep Zakaria 13F, Q4 2013 - Primary late-Nomad filing showing Amazon, Costco, Berkshire Hathaway A, and Liberty Global values and share counts at 31 December 2013.
64. Sleep Zakaria 13F, Q1 2014 - Primary post-year-end snapshot used to show Amazon, Costco, Berkshire, and Liberty Global remained visible before discretion ended.
65. Sleep Zakaria 13F, Q2 2014 - Primary closeout filing stating Sleep Zakaria no longer exercised investment discretion over 13F securities and would stop filing holdings reports.
66. Amazon 2001 annual report - Primary company source for Amazon's early low-price, customer, and free-cash-flow framing.
67. Amazon 2006 Form 10-K - Primary company filing corroborating free shipping, Prime, price reductions, and reinvestment pressure during Nomad's Amazon ownership.
68. Costco 2006 annual report - Primary company source for Costco's membership economics, renewal rates, limited-selection low-price model, and low-margin design.
69. Berkshire Hathaway 1995 annual report - Primary source for Berkshire/GEICO direct-cost advantage and the model Nomad used to understand scale economies shared.
70. Berkshire Hathaway 1996 annual report - Primary source for GEICO's low-cost/low-price/customer-growth loop.
71. Berkshire Hathaway 2004 annual report - Primary source for Berkshire/GEICO scale and profitability context during Nomad's study period.
72. AirAsia 2005 annual report extract - Primary company source for AirAsia passenger growth, route expansion, and low unit-cost claims.
73. Aviation Strategy: AirAsia, March 2008 - Independent industry source for AirAsia stress, fuel, competition, and aircraft-order context.
74. Aviation Strategy: AirAsia, February 2009 - Independent industry source for AirAsia expansion through downturn and operating risk.
75. Stagecoach 2003 annual report - Primary company source for Stagecoach's post-Coach USA balance-sheet and operating context near Nomad's entry.
76. Stagecoach 2005 annual report - Primary company source corroborating UK Bus strength, margins, cash generation, megabus expansion, and capital returns after Nomad's purchase.
77. The Guardian: Stagecoach in GBP500m US shock, 2002 - Contemporaneous press source for Stagecoach's late-2002 stress and market sentiment.
78. OFT Stagecoach/CityLink decision, 2006 - Regulatory context on megabus/CityLink competition and consumer effects after Stagecoach's recovery.
79. Voice of America: Public Outcry Halts Purchase of Independent Thai Newspaper Group, 2005 - Independent source for the Matichon/GMM Grammy takeover controversy and media-freedom context.
80. Morgan Stanley / Mauboussin and Callahan: Birth, Death, and Wealth Creation - Context source for survivorship, skew, and why finding extreme long-term stock winners is harder than hindsight suggests.

Task C caveats

• Exact trade-level purchase dates, average costs, realized exit prices, and dollar P&L are not public for most Nomad holdings; the greatest-trades file marks these gaps rather than inferring false precision.
• Amazon and Costco late weights can be approximated only within the reported 13F sleeve, not full Nomad NAV.
• AirAsia, Matichon, Union Cement, and other non-U.S. holdings are largely absent from 13F data, so the approved Nomad letters remain the principal source.
• The 2013 performance table is a manager-letter record, not a public audited return database; the file uses it with explicit caveats.
• No fresh public legal/enforcement red flag tied to these trades was found in the sources checked for Task C; this remains a public-source check, not a legal opinion.

Task E - own-words sources (2026-07-04T03:28:33Z)

81. IGY Foundation: Nomad Partnership Letters landing page - Official landing page for the approved public letter archive; use this and the IGY-hosted PDF ahead of mirror copies.
82. IGY approved Nomad letters PDF, 2001-2014 - Canonical first-party quote source for Sleep/Zakaria's partnership letters; snippets in the Task E file are intentionally short and attributed to both authors.
83. IGY Foundation: Preamble - First-party provenance and source-hygiene note; useful for approved-version language, publication rationale, and the authors' summary of the investment arc.
84. IGY Foundation: Postamble - First-party retrospective on the final letter, liquidation, why Nomad closed, and the turn toward independence and philanthropy.
85. IGY Foundation: X-Amount - Nick Sleep first-party essay on sufficiency, surplus wealth, identity, and charitable purpose after investment success.
86. IGY Foundation: Short-term vs Long-term - Nick Sleep first-party 2022 checklist tying long-term thinking to patience, primary data, quality, customer systems, trust, and philanthropy.
87. IGY Foundation: Our Guiding Principles - First-party foundation operating principles: low profile, own work, partnership mindset, patient evaluation, and willingness to fund platforms.
88. IGY Foundation: What Are We Looking For? - First-party charity-selection page; useful for root-cause, founder-led, simple, scalable, and non-control-oriented giving criteria.
89. IGY Foundation homepage - First-party source connecting Nomad profits, Nick Sleep, and the I.G.Y. Foundation, plus the International Geophysical Year naming metaphor.
90. Value Investor Insight 2005 issue archive - Official archive confirms the Feb. 22, 2005 issue featured Nicholas Sleep and Costco; full article access remains paywalled, so Task E does not quote third-party mirrors.
91. Colossus Founders #364: Nick & Zak's Excellent Adventure - Secondary podcast based on William Green's chapter; useful narrative context but not a direct Sleep/Zakaria quote source.
92. Colossus Founders #365: Nick Sleep's Letters - Secondary commentary on the approved letters; verify all cited lines against IGY before reuse.
93. The Investor's Podcast Network RWH057, Celebrating Warren Buffett - Potential primary audio excerpt source involving Nick Sleep, but public transcript is partial/gated; do not quote without audio or full transcript verification.
94. William Green author bio - Strong secondary context for Green's interview base and investor coverage; use with page numbers when citing Richer, Wiser, Happier.
95. Google Books metadata: Richer, Wiser, Happier - Bibliographic support for the Green book; page-level checks required before using direct quotes.
96. MOI Global: Mohnish Pabrai on His Evolution as an Investor, Lessons from Nick Sleep - Secondary/practitioner validation of Sleep's influence; Pabrai's comments are not Sleep's words.
97. The Investor's Podcast Network: Value Investing in 2021 with Mohnish Pabrai - Secondary transcript/source for Pabrai's interpretation; useful for influence mapping, not direct attribution.
98. SEC 13F cover: Sleep, Zakaria & Co Ltd, Q2 2014 - Primary filing source for post-closure filing status and investment-discretion caveat; not an own-words philosophy source.
99. SEC Form ADV: Sleep Zakaria & Company Ltd, CRD 159933 - Primary adviser-record source for entity/regulatory identity; useful for legal hygiene, not quote content.
100. Companies House: Sleep, Zakaria and Company Ltd - Primary registry source for entity status and corporate-history hygiene.
101. Charity Commission: I.G.Y. Foundation full register - Primary charity-register source for I.G.Y. Foundation, trustee role, and current charity status.

Task E caveats

• Most quotable Nomad material is co-authored by Nick Sleep and Qais Zakaria. Attribute letter snippets to both unless a source specifically identifies Sleep alone.
• The Task E file uses unusually short snippets because the approved letters are a copyrighted public PDF and the Canon should point readers to the original rather than reproduce the archive.
• Value Investor Insight's 2005 Costco item is important but was not quoted because the official issue was not accessible in full during this run and mirror copies carry provenance/copyright risk.
• Founders, William Green, Pabrai, Quartr, Investment Masters Class, and similar materials are useful secondary interpretation. They should not be treated as Sleep's own words unless the exact quote is independently traced.
• A circulating line about the best investors not being investors was intentionally omitted because it was not found in the approved IGY PDF during this run.
• Public legal/regulatory checks during A/B/C/E did not surface a credible SEC/FCA/litigation red flag for Sleep, Zakaria, Sleep Zakaria, or Nomad. This is a public-source check, not proof of absence or a legal opinion.

Task D - mistakes-and-losses sources (2026-07-04T07:36:14Z)

102. IGY approved Nomad letters PDF, 2001-2014 - Core first-party source for the 2008 drawdown, Conseco, Stagecoach, Union Cement, MBIA, AirAsia, Matichon, final performance table, closure letter, and self-described process changes.
103. IGY Foundation: Preamble - First-party provenance note for the approved public release and privacy edits; used to caveat the letters as curated manager-authored evidence.
104. IGY Foundation: Postamble - First-party retrospective on liquidation, returning capital, regulatory burden, discomfort with repeated justification, and independence/philanthropy.
105. IGY Foundation: X-Amount - Nick Sleep first-party essay on sufficiency, surplus wealth, identity, and post-Nomad purpose.
106. IGY Foundation: Short-term vs Long-term - First-party post-Nomad note used for long-term/customer-first framing and process continuity.
107. Stagecoach 2003 annual report - Primary company source for Coach USA write-downs, statutory loss, restructuring, debt reduction, and recovery context near Nomad's entry.
108. Stagecoach 2005 annual report - Primary company source for UK Bus strength, margin/cash-flow recovery, megabus expansion, and the improving destination Nomad sold too early.
109. Stagecoach 2006 annual report - Primary company source for EPS growth, net debt reduction, and North America continuing revenue recovery after the stressed entry period.
110. The Guardian: Stagecoach in GBP500m US shock, 2002 - Contemporaneous press context for Stagecoach's market stress and Coach USA shock.
111. AirAsia 2008 annual report - Primary company source for passenger/revenue growth, RM497m net loss, net debt, and the dual stress/growth context around Nomad's AirAsia thesis.
112. Aviation Strategy: AirAsia, March 2008 - Independent industry source for fuel, competition, airport capacity, and risk context around AirAsia.
113. Aviation Strategy: AirAsia, February 2009 - Independent industry source for AirAsia share-price stress, Nomad buying context, expansion, and failed Tune Air financing.
114. Voice of America: Public Outcry Halts Purchase of Independent Thai Newspaper Group, 2005 - Independent source for Matichon political/media-freedom takeover context.
115. MBIA 2008 results press release - Primary company source for 2008 loss, adjusted book-value pressure, CDO/mortgage stress, and restructuring context behind MBIA uncertainty.
116. SEC Sleep Zakaria 13F, Q2 2014 text filing - Primary closeout filing stating Sleep Zakaria no longer exercised investment discretion over 13F securities and would stop filing holdings reports.
117. SEC I.G.Y. Limited 13F information table, Q1 2026 - Current primary 13F table for I.G.Y. Limited; used only to caveat post-Nomad visibility, not to extend Nomad performance.
118. SEC Form 13F FAQ - Primary regulatory source for 13F limitations: U.S.-listed long reportable securities rather than complete portfolios or AUM.
119. SEC Form ADV: Sleep Zakaria & Company Ltd, CRD 159933 - Primary adviser-record source for entity identity, SEC exempt-reporting-adviser file, Qais Zakaria signature, and withdrawn FCA-registration notation.
120. Companies House: Sleep, Zakaria and Company Ltd overview - Official UK registry source for active company status and business classification.
121. Companies House: Sleep Zakaria officers - Official UK registry source for Nicholas Sleep and Qais Zakaria as active officers/directors.
122. Charity Commission: I.G.Y. Foundation full register - Official charity-register source for I.G.Y. Foundation status, activity, and trustee context.
123. William Green: Richer, Wiser, Happier page - Secondary context for Sleep/Zakaria reputation, temperament, and life-design interpretation; not used as primary trade evidence.
124. Top Traders Unplugged: William Green episode, 2024 - Secondary source for transferability and survivorship cautions around learning from elite investors.
125. Acquirer's Multiple: Nick Sleep investing masterclass, 2023 - Practitioner secondary source used only for interpretive/transferability critique, not for hard facts.

Task D caveats

• Conseco, Stagecoach, Union Cement, and several trade-level P&L figures remain manager-letter-only in this run; the mistakes file labels these as single-source where appropriate.
• The 2008 loss is a calendar-year manager-reported figure, not a verified peak-to-trough drawdown or independently published audited return series.
• 13F filings do not show non-U.S. holdings, shorts, derivatives, cash, total NAV, tax effects, investor-specific economics, or full post-Nomad ownership.
• Letter material is generally co-authored by Nick Sleep and Qais Zakaria; attribute process admissions to both unless a source singles out Sleep.
• Public legal/regulatory searches found no direct SEC enforcement, FCA final notice, or litigation red flag in reviewed sources as of 2026-07-04T07:36:14Z; this is negative public-source evidence, not a legal opinion.

Negative search log for Task D

• Searched and reviewed SEC filings/ADV records, Companies House, Charity Commission, FCA register context, broad web, and secondary commentary for Nick Sleep, Qais Zakaria, Sleep Zakaria, Nomad Investment Partnership, enforcement, litigation, lawsuit, sanction, final notice, criticism, survivorship, and transferability terms.
• No credible public enforcement/litigation red flag surfaced for Sleep, Zakaria, Sleep Zakaria, or Nomad in the reviewed official and broad-web sources.
• Main unresolved gaps are trade-ledger gaps, not scandal gaps: exact position sizes, purchase/sale schedules, realized P&L, taxes, non-U.S. holdings, and investor-specific net economics remain private.

Task F - key-writings sources (2026-07-04T09:41:57Z)

126. I.G.Y. Foundation, Nomad Partnership Letters landing page - https://igyfoundation.org.uk/nomad-partnership-letters/ — Primary landing page for the approved public Nomad archive and source-control context.
127. I.G.Y. Foundation, Nomad Partnership Letters PDF, September 2021 - https://igyfoundation.org.uk/wp-content/uploads/2021/09/Nomad_Partnership_Letters_1-1.pdf — Primary approved PDF used for the main letters and the separate 3 June 2014 Sleep letter to Warren Buffett.
128. I.G.Y. Foundation, Full Collection Nomad Letters PDF, March 2021 - https://igyfoundation.org.uk/wp-content/uploads/2021/03/Full_Collection_Nomad_Letters_.pdf — Earlier approved archive; useful to flag pagination/content differences from the September 2021 PDF.
129. I.G.Y. Foundation, Preamble - https://igyfoundation.org.uk/preamble/ — Primary provenance and attribution statement for the public release.
130. I.G.Y. Foundation, Postamble - https://igyfoundation.org.uk/postamble/ — Primary explanation of Nomad closure, capital return, independence, and philanthropy.
131. I.G.Y. Foundation, X-Amount - https://igyfoundation.org.uk/xamount/ — Sleep-signed post-Nomad essay on sufficiency and capital purpose.
132. I.G.Y. Foundation, Short-term vs Long-term - https://igyfoundation.org.uk/short-term-v-long-term/ — Sleep-signed essay extending long-term thinking beyond the fund wrapper.
133. I.G.Y. Foundation homepage - https://igyfoundation.org.uk/ — Primary foundation positioning; also points readers toward William Green.
134. I.G.Y. Foundation principles - https://igyfoundation.org.uk/principles/ — Primary operating-principles page for post-Nomad philanthropy.
135. I.G.Y. Foundation, What Are We Looking For? - https://igyfoundation.org.uk/what-are-we-looking-for/ — Primary grant-selection and partnership posture page.
136. Value Investor Insight 2005 archive - https://valueinvestorinsight.com/BrowseByYear_Issues.aspx?Year=2005 — Publisher archive confirming the 22 February 2005 Nicholas Sleep/Costco issue; full text is paywalled/issue-gated.
137. SEC Form ADV for Sleep Zakaria and Company, Ltd. - https://reports.adviserinfo.sec.gov/reports/ADV/159933/PDF/159933.pdf — Final 2015 exempt-reporting-adviser record used for regulatory posture, not current authorization.
138. SEC Sleep Zakaria Q1 2014 13F cover page - https://www.sec.gov/Archives/edgar/data/1384801/000091957414002966/xslForm13F_X01/primary_doc.xml — Late Nomad-era U.S.-reportable holdings context.
139. SEC Sleep Zakaria Q2 2014 13F cover page - https://www.sec.gov/Archives/edgar/data/1384801/000091957414004574/xslForm13F_X01/primary_doc.xml — Cessation/late reporting context near closure.
140. SEC Form 13F FAQ - https://www.sec.gov/rules-regulations/staff-guidance/division-investment-management-frequently-asked-questions/frequently-asked-questions-about-form-13f — Official limitation source for 13F scope and interpretation.
141. Investor.gov Form 13F explainer - https://www.investor.gov/introduction-investing/investing-basics/glossary/form-13f-reports-filed-institutional-investment — Retail-investor explanation of what 13F reports do and do not show.
142. SEC I.G.Y. Limited Q1 2026 13F filing index - https://www.sec.gov/Archives/edgar/data/1811472/000091957426002858/0000919574-26-002858-index.html — Current I.G.Y. Limited 13F filing context; not AUM/personal wealth/charity corpus.
143. Companies House Sleep Zakaria and Company Limited - https://find-and-update.company-information.service.gov.uk/company/05636487 — UK corporate record; corporate status only, not FCA authorization.
144. Companies House I.G.Y. Limited filing history - https://find-and-update.company-information.service.gov.uk/company/08937386/filing-history — UK corporate record and recent address/filing context for I.G.Y. Limited.
145. Charity Commission I.G.Y. Foundation full register print - https://register-of-charities.charitycommission.gov.uk/en/charity-search/-/charity-details/5043661/full-print — Primary UK charity-registration source.
146. Foundation Practice Rating 2023 results table - https://foundationpracticerating.org.uk/results-table-2023/ — Third-party governance-practice ratings: IGY Foundation C diversity, D accountability, A transparency, C overall.
147. William Green, Richer, Wiser, Happier book page - https://williamgreenwrites.com/richer-wiser-happier/ — Best serious secondary source for Sleep/Zakaria temperament and life-design interpretation.
148. William Green bio - https://williamgreenwrites.com/bio/ — Author/background support for Green's access and role.
149. Investing by the Books transcript with William Green - https://matslarsson.squarespace.com/s/IBB-Author-Interview-transcript-of-conversation-with-William-Green.pdf — Secondary interview transcript explaining Green's Sleep/Zakaria interpretation.
150. Top Traders Unplugged interview with William Green - https://www.toptradersunplugged.com/podcast/ttu119-the-secret-to-becoming-richer-wiser-happier-ft-william-green/ — Secondary author interview; use as orientation, not primary Sleep/Zakaria evidence.
151. Investment Masters Class, Learning from Nicholas Sleep - https://mastersinvest.com/newblog/2020/9/16/learning-from-nicholas-sleep — Practitioner synthesis; useful map but not authoritative for hard facts.
152. Morgan Stanley / Michael Mauboussin, Measuring the Moat - https://www.morganstanley.com/im/publication/insights/articles/article_measuringthemoat.pdf — Reception-history source for scale-economies-shared/moat language.
153. Colossus Founders episode 364 - https://colossus.com/episode/364-nick-zaks-excellent-adventure-how-nick-sleep-and-qais-zaharia-built-their-investment-partnership/ — Accessible secondary narrative downstream of Green; note slug misspells Zakaria.
154. Colossus Founders episode 365 - https://colossus.com/episode/365-nick-sleeps-letters-the-full-collection-of-the-nomad-investment-partnership-letters-to-partners/ — Secondary read-through of the Nomad letter collection.
155. The Investor's Podcast Network TIP492 - https://www.theinvestorspodcast.com/episodes/the-best-investor-youve-never-heard-of/ — Structured secondary overview; verify claims against primary letters.
156. The Investor's Podcast Network TIP676 - https://www.theinvestorspodcast.com/episodes/richer-wiser-happier-q4-2024-w-stig-brodersen-william-green/ — Later Green-related reception source.
157. Google Books, Nomad Letters metadata - https://books.google.com/books/about/Nomad_Letters.html?id=KPlo0QEACAAJ — Forthcoming print-edition metadata; conflicts with other retail pages.
158. Skylight Books, Nomad Letters metadata - https://skylightbooks.com/book/9781953953599 — Retail metadata showing December 1, 2026, 336 pages, Stripe Press.
159. Amazon, Nomad Letters metadata - https://www.amazon.com/Nomad-Letters-Collection-Investment-Partnership/dp/195395359X — Retail metadata showing December 1, 2026 release and 336 pages; not an available source for substantive claims.

Task F caveats

• The primary corpus is partly co-authored: Nomad letters, preamble, and postamble are Sleep/Zakaria; later Sleep-signed I.G.Y. essays still reflect the partnership context where the text says so.
• The March 2021 and September 2021 I.G.Y. PDFs differ; cite the September 2021 PDF for the separate June 2014 Buffett letter.
• 13F filings are reportable-securities tables only, not AUM, personal wealth, charity corpus, full portfolios, cash, taxes, shorts, private holdings, or investor-specific returns.
• Value Investor Insight is publisher-confirmed for provenance, but the full 2005 issue remains paywalled/issue-gated; do not quote mirrored copies without checking an official scan.
• Forthcoming print-edition metadata is conflicting and post-dates this run; treat it as a watch item until an official publisher page or the book itself is available.
• Public-source searches did not surface enforcement/litigation against Sleep, Zakaria, Sleep Zakaria, or Nomad; that is negative public-source evidence, not a legal opinion.
• I.G.Y.'s low-profile grant style is source-supported, but the Foundation Practice Rating 2023 accountability score is a governance-practice caveat.

Task H - synthesis sources (2026-07-04T10:41:19Z)

160. I.G.Y. Foundation, Preamble - https://igyfoundation.org.uk/preamble/ — Approved-source control for the public Nomad archive and co-authored Sleep/Zakaria framing.
161. I.G.Y. Foundation, Full Collection Nomad Letters PDF, March 2021 - https://igyfoundation.org.uk/wp-content/uploads/2021/03/Full_Collection_Nomad_Letters_.pdf — Primary source for final return table, 2008 drawdown, philosophy, mistakes, fund structure, closure, and legal-footnote caveats.
162. I.G.Y. Foundation, Nomad Partnership Letters PDF, September 2021 - https://igyfoundation.org.uk/wp-content/uploads/2021/09/Nomad_Partnership_Letters_1-1.pdf — Alternate approved I.G.Y. PDF used to cross-check the public corpus and the separate Buffett-letter item from Task F.
163. I.G.Y. Foundation, Short-term vs Long-term - https://igyfoundation.org.uk/short-term-v-long-term/ — Sleep-signed post-Nomad essay tying Costco/Berkshire/Amazon to long-term customer surplus and trust.
164. I.G.Y. Foundation, Postamble - https://igyfoundation.org.uk/postamble/ — Primary first-party explanation of Nomad's closure, capital return, independence, regulation, and philanthropy.
165. I.G.Y. Foundation, X-Amount - https://igyfoundation.org.uk/xamount/ — Sleep-signed source for sufficiency and post-Nomad capital-purpose lesson.
166. I.G.Y. Foundation homepage - https://igyfoundation.org.uk/ — First-party context connecting Nomad profits, Nick Sleep, Qais Zakaria, and I.G.Y. Foundation.
167. Sleep Zakaria Q4 2013 amended 13F text - https://www.sec.gov/Archives/edgar/data/1384801/000091957414002970/0000919574-14-002970.txt — Primary SEC support for late U.S.-reportable concentration and 13F-only caveat.
168. Sleep Zakaria Q2 2014 13F cover page - https://www.sec.gov/Archives/edgar/data/1384801/000091957414004574/xslForm13F_X01/primary_doc.xml — Primary SEC source confirming cessation of 13F discretion after Nomad closure.
169. SEC Form 13F FAQ - https://www.sec.gov/rules-regulations/staff-guidance/division-investment-management-frequently-asked-questions/frequently-asked-questions-about-form-13f — Official limitation source for 13F scope.
170. SEC Form ADV Sleep Zakaria - https://reports.adviserinfo.sec.gov/reports/ADV/159933/PDF/159933.pdf — Primary regulatory identity source; not performance evidence.
171. Companies House Sleep Zakaria overview - https://find-and-update.company-information.service.gov.uk/company/05636487 — Current corporate-status check.
172. Companies House I.G.Y. Limited overview - https://find-and-update.company-information.service.gov.uk/company/08937386 — Current corporate-status check for the post-Nomad I.G.Y. vehicle cited in the synthesis.
173. Charity Commission I.G.Y. Foundation full register - https://register-of-charities.charitycommission.gov.uk/en/charity-search/-/charity-details/5043661/full-print — Current charity status, trustee, income, and expenditure context.
174. Costco 2002 Form 10-K - https://www.sec.gov/Archives/edgar/data/909832/000103221002001631/d10k.htm — Primary company context for Costco scale/membership/low-price economics used as a teaching case.
175. Costco 2004 Form 10-K - https://www.sec.gov/Archives/edgar/data/909832/000119312505223245/d10k.htm — Primary company context for Costco renewal economics and low-margin membership model.
176. Amazon 2008 fourth-quarter release - https://press.aboutamazon.com/2009/1/amazon-com-announces-fourth-quarter-sales-up-18-to-6-70-billion-2008-free-cash-flow-grows-16-to-1-36-billion — Primary company source for Amazon crisis-period sales and free-cash-flow context.
177. MBIA 2008 results - https://investor.mbia.com/investor-relations/press-releases/press-release-details/2009/MBIA-Inc-Reports-Full-Year-and-Fourth-Quarter-2008-Results/default.aspx — Primary support for MBIA opacity/dilution-risk boundary.
178. ALTA, Conseco bankruptcy - https://www.alta.org/news-and-publications/news/20021219-Conseco-Bankruptcy-Among-Largest-in-US-History — Independent context for Conseco leverage and bankruptcy risk.
179. Holcim Q2 2004 report - https://www.holcim.com/sites/holcim/files/documents/holcim_q2_2004_report-en.pdf — Primary issuer context for Union Cement/Holcim sizing and capacity lesson.
180. Holcim Q3 2004 report - https://www.holcim.com/sites/holcim/files/documents/holcim_q3_2004_report-en.pdf — Primary issuer context for Union Cement/Holcim and non-U.S. holding caveats.
181. APO Matichon/GMM report - https://www.apo-tokyo.org/wp-content/uploads/2014/07/ind-38-m_a.pdf — Independent political/media-control context for Matichon/GMM.
182. FCA Financial Services Register overview - https://www.fca.org.uk/firms/financial-services-register — Official context for future FCA-register/legal-status checks.
183. Amazon Nomad Letters metadata - https://www.amazon.com/Nomad-Letters-Collection-Investment-Partnership/dp/195395359X — Forthcoming print-edition metadata watch item, not substantive source.

Task H caveats

• T0314 mental-models remained freshly claimed/missing during this run; refresh H after G lands.
• Nomad figures are manager-letter-derived and not a public audited fund database, even though letters cite administrator/auditor support.
• 13F filings are reportable U.S. securities only, not NAV/AUM/net worth/charity corpus/full portfolio.
• Sleep/Zakaria attribution remains co-authored unless a source singles out Sleep.
• No public enforcement/litigation red flag surfaced in checked sources as of 2026-07-04; negative evidence, not legal opinion.

Task G - mental-models sources (2026-07-04T13:33:10Z)

184. I.G.Y. Foundation, Preamble - https://igyfoundation.org.uk/preamble/ — Approved-source control for the public Nomad archive; used for provenance, co-authorship, and edited-public-release caveats.
185. I.G.Y. Foundation, Full Collection Nomad Letters PDF, March 2021 - https://igyfoundation.org.uk/wp-content/uploads/2021/03/Full_Collection_Nomad_Letters_.pdf — Core primary corpus for scale economies shared, terminal portfolio, destination analysis, inactivity, partner fit, mistakes, 2008 result, and closure context.
186. I.G.Y. Foundation, Nomad Partnership Letters PDF, September 2021 - https://igyfoundation.org.uk/wp-content/uploads/2021/09/Nomad_Partnership_Letters_1-1.pdf — Alternate approved I.G.Y. PDF used as a cross-check for the public Nomad corpus.
187. I.G.Y. Foundation, Nomad Partnership Letters landing page - https://igyfoundation.org.uk/nomad-partnership-letters/ — Primary landing page for the approved archive and public-source control.
188. I.G.Y. Foundation, Short-term vs Long-term - https://igyfoundation.org.uk/short-term-v-long-term/ — Sleep-signed source for long-term orientation, trust, primary data, ownership, and scale-economies-shared continuity after Nomad.
189. I.G.Y. Foundation, Postamble - https://igyfoundation.org.uk/postamble/ — Primary first-party explanation of Nomad liquidation, capital return, regulatory burden, autonomy, and philanthropy.
190. I.G.Y. Foundation, X-Amount - https://igyfoundation.org.uk/xamount/ — Sleep-signed source for sufficiency, surplus wealth, identity, and post-Nomad capital-purpose mental model.
191. I.G.Y. Foundation homepage - https://igyfoundation.org.uk/ — First-party context connecting Nomad, Sleep/Zakaria profits, and I.G.Y. Foundation.
192. I.G.Y. Foundation principles - https://igyfoundation.org.uk/principles/ — First-party operating-principles source for low-profile work, own-work diligence, partnership posture, and test-then-scale behavior.
193. I.G.Y. Foundation, What Are We Looking For? - https://igyfoundation.org.uk/what-are-we-looking-for/ — First-party source for root-cause, founder-led, long-duration philanthropic filters that echo the investing framework.
194. Costco 2002 Form 10-K - https://www.sec.gov/Archives/edgar/data/909832/000103221002001631/d10k.htm — Primary company support for membership, low prices, inventory turnover, limited selection, and scale-shared economics.
195. Costco 2006 annual report - https://s201.q4cdn.com/287523651/files/doc_financials/2006/ar/Annual_report_2006.pdf — Primary company support for Costco's continuing warehouse/membership economics.
196. Amazon 2001 annual report - https://s2.q4cdn.com/299287126/files/doc_financials/annual/2001annualreport.pdf — Primary company source for early customer-experience, growth, and lower-unit-cost flywheel evidence.
197. Amazon 2006 Form 10-K - https://www.sec.gov/Archives/edgar/data/1018724/000119312507034081/d10k.htm — Primary company source for Prime/free-shipping and reinvestment context.
198. Amazon 2008 Q4 release - https://press.aboutamazon.com/2009/1/amazon-com-announces-fourth-quarter-sales-up-18-to-6-70-billion-2008-free-cash-flow-grows-16-to-1-36-billion — Primary company source for crisis-period sales and free-cash-flow context.
199. Berkshire Hathaway 1996 annual report - https://www.berkshirehathaway.com/1996ar/1996.html — Primary company source for GEICO low-cost/low-price/customer-retention analogy.
200. Berkshire Hathaway 2004 annual report - https://www.berkshirehathaway.com/2004ar/2004ar.pdf — Primary Berkshire context for long-term ownership and operating-business comparison.
201. Sleep Zakaria Q4 2013 amended 13F text - https://www.sec.gov/Archives/edgar/data/1384801/000091957414002970/0000919574-14-002970.txt — Primary SEC support for late visible U.S.-reportable Amazon, Costco, Berkshire, and Liberty Global concentration.
202. Sleep Zakaria Q1 2014 13F text - https://www.sec.gov/Archives/edgar/data/1384801/000091957414002966/0000919574-14-002966.txt — Primary SEC support for late visible U.S.-reportable holdings near closure.
203. Sleep Zakaria Q2 2014 13F cover page - https://www.sec.gov/Archives/edgar/data/1384801/000091957414004574/xslForm13F_X01/primary_doc.xml — Primary SEC source confirming cessation of 13F discretion after Nomad closure.
204. Sleep Zakaria Q2 2014 13F text - https://www.sec.gov/Archives/edgar/data/1384801/000091957414004574/0000919574-14-004574.txt — Primary closeout filing context for why later cloning from Sleep Zakaria 13Fs is impossible.
205. SEC Form 13F FAQ - https://www.sec.gov/rules-regulations/staff-guidance/division-investment-management-frequently-asked-questions/frequently-asked-questions-about-form-13f — Official limitation source for 13F scope, foreign managers, and reportable-securities caveats.
206. I.G.Y. Limited Q1 2026 13F cover page - https://www.sec.gov/Archives/edgar/data/1811472/000091957426002858/xslForm13F_X02/primary_doc.xml — Current 13F source signed by N. Sleep; used only for post-Nomad visibility caveats.
207. I.G.Y. Limited Q1 2026 13F information table - https://www.sec.gov/Archives/edgar/data/1811472/000091957426002858/xslForm13F_X02/infotable.xml — Current reported Amazon, Berkshire, and Costco table; not Nomad performance, personal net worth, AUM, or charity corpus.
208. SEC Form ADV for Sleep Zakaria and Company, Ltd. - https://reports.adviserinfo.sec.gov/reports/ADV/159933/PDF/159933.pdf — Primary regulatory record for Sleep Zakaria identity and withdrawn FCA-registration notation.
209. Companies House: Sleep, Zakaria and Company Ltd overview - https://find-and-update.company-information.service.gov.uk/company/05636487 — Official UK corporate-status source; status only, not authorization or performance.
210. Companies House: Sleep Zakaria officers - https://find-and-update.company-information.service.gov.uk/company/05636487/officers — Official officer record for Nicholas Sleep and Qais Zakaria.
211. Companies House: I.G.Y. Limited overview - https://find-and-update.company-information.service.gov.uk/company/08937386 — Official UK corporate-status source for post-Nomad I.G.Y. Limited.
212. Companies House: Nicholas Sleep appointments - https://find-and-update.company-information.service.gov.uk/officers/FsRTdwByRkhyDjM3wUaKjP44B6I/appointments — Official current appointment source; not proof of operational role level.
213. Charity Commission: I.G.Y. Foundation full register - https://register-of-charities.charitycommission.gov.uk/en/charity-search/-/charity-details/5043661/full-print — Official charity-register source for current I.G.Y. status, trustees, income, expenditure, and reporting posture.
214. Stagecoach 2003 annual report - https://www.annualreports.com/HostedData/AnnualReportArchive/s/LSE_SGC.L_2003.pdf — Primary company context for stress, Coach USA write-downs, debt reduction, and recovery evidence around the Stagecoach lesson.
215. Stagecoach 2005 annual report - https://www.annualreports.com/HostedData/AnnualReportArchive/s/LSE_SGC.L_2005.pdf — Primary company context for the continuing recovery that makes the premature-sale lesson operational.
216. Aviation Strategy, AirAsia March 2008 - https://aviationstrategy.aero/newsletter/Mar-2008/1/Tough-times-ahead-for-AirAsia-Group — Independent industry source for fuel, financing, capacity, competition, and cyclicality risk around AirAsia.
217. Aviation Strategy, AirAsia February 2009 - https://aviationstrategy.aero/newsletter/Feb-2009/2/AirAsia%3Aexpanding-out-of-the-downturn — Independent industry source for downturn stress and expansion-financing context.
218. Holcim Q2 2004 report - https://www.holcim.com/sites/holcim/files/documents/holcim_q2_2004_report-en.pdf — Primary issuer context for Union Cement/Holcim transaction and capacity lesson.
219. Holcim Q3 2004 report - https://www.holcim.com/sites/holcim/files/documents/holcim_q3_2004_report-en.pdf — Primary issuer context for Union Cement/Holcim ownership developments.
220. MBIA 2008 results - https://investor.mbia.com/investor-relations/press-releases/press-release-details/2009/MBIA-Inc-Reports-Full-Year-and-Fourth-Quarter-2008-Results/default.aspx — Primary company support for MBIA loss, restructuring, insured-derivative stress, and dilution/knowability risk.
221. ALTA, Conseco bankruptcy - https://www.alta.org/news-and-publications/news/20021219-Conseco-Bankruptcy-Among-Largest-in-US-History — Independent context for Conseco leverage, bankruptcy, and old-equity impairment.
222. Voice of America: Matichon/GMM Grammy, 2005 - https://www.voanews.com/a/a-13-2005-09-22-voa29/310345.html — Independent context for Matichon political/media-freedom takeover risk.
223. William Green, Richer, Wiser, Happier book page - https://williamgreenwrites.com/richer-wiser-happier/ — Best serious secondary source for Sleep/Zakaria temperament, life-design interpretation, and reception; not used for hard trade facts.
224. Investing by the Books transcript with William Green - https://matslarsson.squarespace.com/s/IBB-Author-Interview-transcript-of-conversation-with-William-Green.pdf — Secondary interpretation of information diet, destination thinking, and temperament.
225. Value Investor Insight 2005 archive - https://valueinvestorinsight.com/BrowseByYear_Issues.aspx?Year=2005 — Publisher provenance for the Nicholas Sleep/Costco interview; full text remains gated and was not quoted.
226. MOI Global / Mohnish Pabrai, 2021 - https://moiglobal.com/mohnish-pabrai-202101/ — Secondary transferability context; used only as interpretation, not Sleep primary evidence.
227. Investment Masters Class, Learning from Nicholas Sleep - https://mastersinvest.com/newblog/2020/9/16/learning-from-nicholas-sleep — Practitioner synthesis used for source orientation; claims checked against primary sources.
228. Morgan Stanley / Michael Mauboussin, Measuring the Moat - https://www.morganstanley.com/im/publication/insights/articles/article_measuringthemoat.pdf — Reception-history source for scale-economies-shared/moat language.
229. Colossus Founders episode 365 - https://colossus.com/episode/365-nick-sleeps-letters-the-full-collection-of-the-nomad-investment-partnership-letters-to-partners/ — Secondary read-through of the letter collection; not used for hard figures.
230. Costco 2004 Form 10-K - https://www.sec.gov/Archives/edgar/data/909832/000119312505223245/d10k.htm — Primary Costco source cited in the mental-models file for low-price, high-volume, membership-warehouse economics.
231. Costco 2024 Form 10-K - https://www.sec.gov/Archives/edgar/data/909832/000090983224000049/cost-20240901.htm — Current primary Costco source used only to describe durable warehouse/membership economics, not Nomad-era returns.
232. Amazon 2023 Form 10-K - https://www.sec.gov/Archives/edgar/data/1018724/000101872424000008/amzn-20231231.htm — Current primary Amazon source used only to show continuing customer/reinvestment categories, not Nomad-era valuation.
233. Berkshire Hathaway 2013 annual report - https://www.berkshirehathaway.com/2013ar/2013ar.pdf — Primary Berkshire source used for decentralized ownership and long-duration capital-allocation context.
234. CNO/Conseco reorganization release - https://ir.cnoinc.com/news/news-details/2003/Conseco-Inc-Announces-Confirmation-of-Plan-of-Reorganization/default.aspx — Primary company source for Conseco plan confirmation and old-equity impairment context.
235. SEC administrative proceeding, Conseco, 2004 - https://www.sec.gov/enforcement-litigation/administrative-proceedings/34-49392 — Official SEC source used for Conseco accounting/enforcement context; not tied to Sleep/Zakaria wrongdoing.
236. MBIA financial update, first nine months 2008 - https://investor.mbia.com/investor-relations/press-releases/press-release-details/2008/MBIA-Inc-Provides-Financial-Update-and-Reports-Financial-Results-for-First-Nine-Months-of-2008/default.aspx — Primary company source for interim 2008 loss/capital pressure and denominator-uncertainty context.
237. MBIA letter to owners, March 18, 2009 - https://s22.q4cdn.com/567650046/files/doc_downloads/letters/Letter_2_Owners_3182009.pdf — Primary company letter used for recapitalization/per-share value uncertainty context.
238. Holcim 2004 annual report - https://www.holcim.com/sites/holcim/files/documents/holcim_annual_report_2004-en.pdf — Primary issuer source for Union Cement/Holcim transaction and capacity/illiquidity lesson.
239. Capital A / AirAsia 2008 annual report - https://www.capitala.com/misc/ar2008.pdf — Primary company source for AirAsia growth and stress context in the capital-intensive cyclicals failure-mode discussion.
240. IDE/JETRO, Asian Economic Yearbook 2006 Thailand chapter - https://www.ide.go.jp/library/English/Publish/Books/Eng_Books/Yearbook/pdf/2006_13.pdf — Independent source for Thai political/media context around Matichon/GMM risk.
241. FCA Financial Services Register overview - https://www.fca.org.uk/firms/financial-services-register — Official context for current/previous authorization checks; used as legal-status caveat, not proof of current authorization.

Task G caveats

• Nomad letters, preamble, and postamble are Sleep/Zakaria co-authored unless a source singles out Sleep; later I.G.Y. essays are Sleep-signed where the page says so.
• Nomad trade figures and 2008 return/drawdown data are manager-letter-derived, not a public trade ledger; exact costs, sale dates, taxes, cash, and investor-level net economics remain private.
• 13F filings are reportable U.S. securities only and do not show full AUM/NAV, non-U.S. holdings, cash, shorts, derivatives, private holdings, tax effects, personal net worth, or charity corpus.
• I.G.Y. Limited's Q1 2026 13F is a current public snapshot signed by N. Sleep, not a continuation of Nomad performance, a public fund, or a complete wealth statement.
• Value Investor Insight's 2005 Costco issue is publisher-confirmed but full text remains gated; no mirrored or unofficial quote was used in the mental-models file.
• Public-source legal/regulatory checks found no direct SEC enforcement action, FCA final notice, DOJ action, or litigation red flag tied to Nick Sleep, Qais Zakaria, Sleep Zakaria and Company Ltd., or Nomad Investment Partnership as of 2026-07-04T13:33:10Z; this is negative public-source evidence, not legal advice or proof of absence.
• The existing Task H caveat saying T0314 was missing is a historical note from the prior run. This Task G closes the missing mental-models file but does not refresh synthesis.md because T0314 does not require editing synthesis.