The Letter That Ended an Era
In the spring of 2014, a handwritten letter arrived at the offices of Berkshire Hathaway in Omaha, Nebraska. It was addressed to
Warren Buffett, and it began with the kind of sentence that nobody in the professional money management industry writes: "Dear Mr. Buffett, after 13 happy years of running the Nomad Investment Partnership, Zak and I have decided to close the fund." The author was Nick Sleep, a forty-six-year-old Englishman who had just spent thirteen years compiling one of the most extraordinary investment records in modern history — a net return of 921.1% from inception to close, roughly 18.4% annualized after fees, during a period that encompassed the dot-com aftermath, the global financial crisis, and the slow grinding recovery that followed. He was writing to say thank you and goodbye. Not goodbye to Buffett personally, but to the entire enterprise of professional investing. He and his partner, Qais Zakaria — "Zak" — were returning every dollar to their clients, winding down the fund, and walking away from a business that was generating tens of millions of dollars in annual fees. They were, in the parlance of the industry, leaving money on the table. An obscene amount of it.
The letter is tender, almost disarmingly so. Sleep thanks Buffett for Berkshire's contribution to Nomad's returns and notes that the fund made "around $2 billion" for its clients, who were "predominantly charities and educational endowments." He calls this "capitalism working well." Then he reveals his plans: Zak has his charitable causes, and Sleep himself intends to establish a center providing respite care. There is no mention of a next fund, no hint of a family office, no quiet repositioning into the advisory ecosystem that absorbs retired fund managers like a sponge. The letter reads less like a retirement announcement than a valediction — a man settling his accounts, not with money but with meaning.
This is the paradox at the center of Nick Sleep's life, and the reason his name circulates among a certain kind of investor with the reverence usually reserved for religious figures or dead poets. He built a fortune by identifying businesses that sacrificed short-term profits for long-term compounding, and then he sacrificed his own compounding machine — the fund itself — because he believed there was something better to do with his time. The philosophy and the biography rhyme so precisely that it is almost suspicious.
By the Numbers
The Nomad Investment Partnership
921.1%Cumulative net return (2001–2013)
~18.4%Annualized net return after fees
~$2BApproximate profit generated for clients
13Years of operation
10Core holdings at any given time
$0Management fees charged in final years (performance only)
Geology, Geography, and the Art of Misfit Careers
Nick Sleep wanted to stay in Edinburgh. This is how the story starts — not with a childhood dream of markets or a precocious talent for numbers, but with a geographical preference. He had studied geology at university, then switched to geography, which is either a sign of intellectual restlessness or a young man who hadn't yet found his vocation. His pre-finance employment history is a collection of seeming non sequiturs: he worked in a department store, at an information technology firm, and — most improbably — as a sponsored windsurfer. None of these experiences, on paper, suggested a future in capital allocation. All of them, in retrospect, revealed something about the man: a comfort with being far from the center of things, a willingness to look foolish, and a habit of following curiosity rather than convention.
Edinburgh, as it happens, had a deep and somewhat underappreciated tradition of fund management. Sleep noticed this the way a geographer might notice a particular stratum of rock — not because anyone told him to look, but because he was paying attention to the landscape. He picked up an obscure book called
Investment Trust Explained and read it with the same empirical interest he might have brought to plate tectonics. "I like the sense of it being an intellectual investigation," he said later, which is both perfectly apt and slightly odd — the word "investigation" suggesting something forensic, patient, almost archaeological, rather than the adrenaline-soaked trading floor that the public imagines when it thinks about investing.
He landed a trainee analyst position at a small Scottish fund company. He was not abundantly qualified. But what Sleep brought to the role — what no credential could have conferred — was a mind that had been trained to think in systems and time scales that dwarfed the quarterly earnings cycle. Geology teaches you to read landscapes as records of processes operating over millions of years. Geography teaches you that human activity is shaped by terrain, climate, and the distribution of resources in ways that are often invisible to the people living inside them. Both disciplines reward patience and pattern recognition over speed and certainty. Both demand comfort with ambiguity. Sleep had, without knowing it, been preparing for a career in long-term investing his entire adult life.
The Invention of Nomad
The Nomad Investment Partnership was established in September 2001 — a launch date that, in hindsight, looks either heroically contrarian or accidentally fortunate, given that the September 11 attacks had just cratered global markets and created the kind of widespread panic that value investors live for. Sleep and his partner Qais Zakaria operated under the umbrella of Marathon Asset Management, a London-based firm with its own distinguished pedigree in long-duration, fundamentals-driven investing. Marathon provided the institutional scaffolding; Sleep and Zakaria provided the intellectual engine.
Qais Zakaria — Zak — is the less visible half of the partnership, which is saying something given that Sleep himself is nearly invisible by the standards of the hedge fund industry. Where Sleep was the geographer-turned-analyst, Zak brought a complementary rigor: quantitative, methodical, deeply versed in the mechanics of business analysis. The two men functioned as a single organism of thought, their partnership the kind of genuine intellectual marriage that is far rarer in finance than the industry's fondness for "team" language would suggest. Sleep did much of the writing — the annual letters to partners, which would eventually become the primary vehicle through which the world came to know Nomad's philosophy — but the thinking was joint, recursive, and impossible to cleanly attribute.
The fund's structure was unusual from the start. Nomad charged lower fees than the industry norm and would eventually move to a model where Sleep and Zakaria took no management fee at all, earning only a share of profits above a hurdle rate. This was not charity; it was alignment. Sleep understood, with a clarity that bordered on obsession, that the structure of incentives determines the behavior of systems. If you charge a management fee based on assets under management, you are incentivized to gather assets, not to generate returns. If you charge only for performance, you are incentivized to own the best businesses and hold them for as long as they compound. The fee structure was not a marketing gimmick. It was the philosophy made structural.
The fund was small by industry standards — never much more than a few hundred million dollars — and Sleep actively resisted growing it. He turned away capital. He limited the number of investors. He wrote long, discursive, intellectually ambitious letters to the partners he did accept, letters that read less like quarterly updates and more like chapters of an ongoing book about the nature of value, the psychology of markets, and the moral architecture of capitalism. Each letter was a kind of argument — rigorously sourced, laced with dry humor, and always circling back to a handful of core ideas that Sleep refined year over year with the patience of a sculptor working in stone.
Destination Analysis and the Shape of [Compounding](/mental-models/compounding)
The central intellectual contribution of Nick Sleep's career — the idea that distinguishes him from the hundreds of other intelligent, well-read value investors who cite Buffett and Munger — is what he called "destination analysis." The concept is deceptively simple, almost tautological when stated plainly: instead of asking what a business is worth today, ask what it will look like in ten or twenty years if current trends continue. Where is it going? What does the destination look like? And — crucially — does the market systematically undervalue businesses whose destinations are dramatically different from their current states?
The answer, Sleep argued, was yes. And the reason was structural, rooted in the incentives and time horizons of the professional investment industry. Most fund managers are evaluated quarterly or annually. Their clients — pension funds, endowments, funds of funds — evaluate them on rolling three- to five-year periods. The entire apparatus of professional money management is designed to reward people who are roughly right over short periods and punish people who are precisely right over long ones. A fund manager who buys a stock that declines 30% over two years before compounding at 25% annually for the next decade will, in many cases, be fired before the compounding begins.
Sleep saw this not as a bug but as an opportunity. If the professional investment industry is structurally incapable of holding positions for the time periods over which the most extraordinary businesses compound, then the patient investor faces less competition than the theory of efficient markets would suggest. The market is not irrational. It is rational within the constraints of its participants' incentive structures. But those constraints create exploitable gaps for anyone willing to operate outside them.
The real work is done by you and the good people at Berkshire. The purpose of this letter is to say a very big thank you, and let you know that you have made a real difference.
Destination analysis, in practice, led Sleep to a very small number of businesses that shared a particular structural feature: they systematically reinvested efficiency gains back into lower prices for customers, creating a flywheel of growing volume, declining unit costs, and deepening competitive advantage. Sleep called this "scale economics shared" — the willingness to pass savings along to consumers rather than capture them as profits. It was, in his framing, a business model disguised as an act of generosity. Or perhaps it was generosity that happened to be the optimal business strategy. The distinction mattered less than the outcome: these businesses compounded at extraordinary rates over long periods because their competitive advantages grew stronger with scale rather than weaker.
The Costco Conviction
The clearest expression of Sleep's philosophy in action was Nomad's investment in Costco Wholesale, the Issaquah, Washington–based membership warehouse retailer that Jim Sinegal and Jeffrey Brotman founded in 1983 after Sinegal had spent years studying at the feet of
Sol Price, the maverick retailer who invented the warehouse club format with FedMart and then Price Club. Sinegal — a compact, intensely focused man who started his retail career at eighteen, unloading mattresses at FedMart — had absorbed Price's foundational insight: that a retailer could generate extraordinary loyalty and volume by operating on razor-thin margins, charging a membership fee that created a commitment device, and relentlessly driving down costs in ways that benefited the customer rather than the shareholder.
Sleep recognized in Costco the purest embodiment of scale economics shared that existed in public markets. The company's average markup on goods was roughly 11%, capped at 14% by corporate policy — compared to 25% or more at conventional retailers and 50% or more at specialty stores. The membership fee, not the product margin, was where Costco made its money. This created an elegant structural loop: lower prices attracted more members, more members generated more fee revenue, more fee revenue funded further investment in lower prices, and the cycle repeated with increasing force. The destination, Sleep argued, was a company that would grow larger, more efficient, and more beloved by its customers for decades — and the market was pricing it as though it were an ordinary retailer facing ordinary competitive pressures.
Nomad built a massive position. At various points, Costco represented one of the fund's largest holdings. Sleep held it through periods when the stock went nowhere, through periods when Wall Street analysts complained about the company's unwillingness to raise margins (the perennial criticism of Costco, and the one that most perfectly illustrated the gap between short-term and long-term thinking), and through the 2008 financial crisis, when the stock declined along with everything else. He held it because the destination hadn't changed. The flywheel was still spinning. The scale economics were still being shared.
The Costco investment is instructive not just for its returns — which were enormous — but for what it reveals about Sleep's temperament. Most value investors talk about patience. Sleep practiced it to a degree that bordered on the pathological. Doing nothing, in his framework, was not passivity but the highest form of activity. It required constant re-evaluation of the thesis, constant resistance to the market's invitation to trade, and constant faith that the passage of time was an ally rather than an enemy. The hardest thing in investing, Sleep once suggested, is not finding the right answer but sitting with it long enough for it to work.
The Amazon Bet
If Costco was the purest expression of Sleep's philosophy, Amazon was its most audacious application. In the early-to-mid 2000s, Amazon was widely viewed by the professional investment community as an overvalued internet stock that had survived the dot-com bust through a combination of
Jeff Bezos's relentless optimism and Wall Street's residual appetite for growth stories. The company was not consistently profitable. Its free cash flow was erratic. Its business model — selling books and consumer goods online at prices that often appeared to be below cost — struck many traditional value investors as fundamentally unsound.
Sleep saw something different. He saw Costco, but for the internet. He saw scale economics shared — the same structural flywheel of lower prices, higher volume, lower unit costs, and deeper competitive advantage — operating in a new medium with dramatically lower marginal costs and dramatically higher potential scale. Bezos was, in Sleep's analysis, running the Sol Price playbook in digital form, reinvesting every dollar of efficiency gain back into the customer experience rather than reporting it as profit. The market, fixated on quarterly earnings and near-term profitability, was systematically undervaluing a business whose destination was total retail dominance.
Nomad began building a position in Amazon when the stock was trading in the low hundreds — a price that, adjusted for subsequent stock splits, represents a fraction of its eventual value. Sleep held it through years of skepticism from the value investing community, many of whom regarded Amazon as the antithesis of value investing: unprofitable, capital-intensive, and priced on faith rather than fundamentals. Sleep's response was characteristically quiet. He didn't argue. He just held. The letters to partners occasionally referenced Amazon's expanding competitive position, but without the triumphalism that a lesser investor might have indulged. The stock would do what the business did. The business was doing extraordinary things.
The Amazon investment was, in many ways, the defining bet of Sleep's career — not because it generated the most money (though it almost certainly did) but because it required the most intellectual courage. To own Amazon as a self-identified value investor in the mid-2000s was to court ridicule from your own tribe. It demanded a willingness to think from first principles rather than from category labels, to recognize that "value" was not a style but a mathematical relationship between price and long-term cash flows, regardless of whether the business in question looked like a "value stock" by traditional metrics. Sleep grasped this earlier and more completely than almost anyone in the professional investment community. It was, in the language of his own framework, a destination analysis that almost nobody else was willing to perform.
As time goes by, the performance that our clients have received is the capitalization of the success of the firms in which we have invested. In other words, the real work is done by you and the good people at Berkshire.
The Anti-Portfolio Manager
Everything about how Sleep ran Nomad was a deliberate inversion of industry norms, and the inversion was not contrarian posturing — it was the logical conclusion of a simple premise: that the structure of the investment management business is designed to benefit the manager at the expense of the client, and that any manager who genuinely believed in alignment would have to rebuild the structure from the ground up.
Start with portfolio construction. Where most hedge funds held dozens or hundreds of positions — diversifying away conviction and ensuring that no single idea could materially affect returns — Nomad concentrated into roughly ten holdings at any given time. This was not a philosophical abstraction. Ten positions meant that Sleep had to be right about very few things, but he had to be very right. It meant that every new idea had to earn its place not merely by being good but by being better than something already in the portfolio. The opportunity cost discipline was ferocious.
Then the fees. Nomad's fee structure evolved over the fund's life toward an arrangement where Sleep and Zakaria charged no management fee and took only a share of profits above a meaningful hurdle rate. In an industry where the standard "2 and 20" structure (2% of assets annually, plus 20% of profits) generates enormous wealth for managers regardless of whether they outperform, this was radical. It meant that in years when Nomad underperformed, Sleep and Zakaria earned nothing. It meant that the only way they could prosper was if their clients prospered first. The alignment was total, and the message to investors was unmistakable: we eat what we kill.
The letters. Sleep's annual and semi-annual letters to Nomad's partners are, in the considered opinion of many serious investors, the finest body of investment writing produced in the twenty-first century. They are long — sometimes fifteen or twenty pages — and they range freely across economics, psychology, business history, philosophy, and even literary criticism. They cite Bertrand Russell and
Richard Feynman alongside Walmart's annual report. They contain jokes that reward slow reading. They are honest about mistakes in ways that are almost unheard of in an industry built on the careful curation of track records.
What makes the letters extraordinary is not their erudition — plenty of hedge fund managers are well-read — but their cumulative argument. Read sequentially, the Nomad letters constitute a coherent and evolving philosophy of value creation that begins with individual business analysis and expands, year by year, into a theory of how economies work, how institutions decay, how incentives corrupt, and how a small number of businesses manage to resist the gravitational pull of mediocrity through structural features that the market consistently undervalues. The full collection has been published as
The Full Collection of the Nomad Investment Partnership Letters to Partners, and it reads less like a financial document than like the notebook of a deeply original thinker who happened to express himself through portfolio construction.
[Scale](/mental-models/scale) Economics Shared: A Theory of Everything
Sleep's concept of "scale economics shared" deserves extended treatment because it is, in effect, his theory of everything — the single analytical lens through which he interpreted businesses, industries, and the nature of competitive advantage itself.
The idea builds on the familiar concept of economies of scale: as a business grows, its unit costs tend to decline because fixed costs are spread across more units, purchasing power increases, and operational efficiencies compound. This much is standard microeconomics, taught in every introductory business course. What Sleep observed — and what he believed the market systematically failed to price — was the difference between companies that captured those scale benefits as profit and companies that passed them along to customers as lower prices.
The distinction sounds minor. It is not. A company that captures scale benefits as profit reports higher margins as it grows. The stock market rewards higher margins with higher valuations. Analysts upgrade the stock. Institutional investors buy. Everyone is happy — for a while. But the high margins attract competition. New entrants, seeing fat profits, invest to capture a share. The original company's competitive position erodes. The margins compress. The stock declines. The cycle repeats.
A company that shares scale benefits with customers reports flat or declining margins as it grows. The stock market punishes flat margins. Analysts complain. Institutional investors, comparing the company's margins unfavorably with peers, rotate out of the stock. But the low prices repel competition — who wants to enter a market where the dominant player is barely making money? — and attract customers, who shift their spending toward the company offering the best value. Volume grows. Scale increases. Unit costs fall further. More savings are passed along. The competitive advantage deepens not despite the low margins but because of them.
This is the Costco model. This is the Amazon model. This is what Sleep recognized as the most durable form of competitive advantage in capitalism: a business that grows stronger as it grows larger because it is structured to benefit customers rather than shareholders in the short term, thereby benefiting shareholders enormously in the long term. The paradox is real and profound: the companies that try hardest to maximize profits often destroy value over time, while the companies that seem indifferent to profits create the most value. Sleep saw this not as an accident but as a fundamental law of business, as reliable as gravity and as poorly understood.
The Disappearing Man
Nick Sleep does not give interviews. He does not appear on podcasts. He does not maintain a social media presence. He has not, to the public's knowledge, published a single word since the Nomad letters ceased in 2014. In an age when every modestly successful fund manager has a Twitter following, a Substack, and a standing invitation to appear at investment conferences, Sleep's silence is so total that it functions as a kind of statement — a negation so emphatic that it becomes its own form of communication.
This is not the reticence of a man who is shy about his record. The record speaks for itself, and Sleep knows it. It is something more deliberate: a choice to withdraw from the arena of professional opinion-making, a conviction that the best thing a retired investor can do is stop talking about investing. In the farewell letter to Buffett, Sleep wrote that he and Zak were "keen to leave the professional industry behind, and spend our time in more caring pursuits." The word "caring" is doing heavy work in that sentence. It implies that the professional industry is, by definition, uncaring — or at least that it crowds out the capacity for care.
What Sleep has done since 2014 is known only in outline. He mentioned plans to establish a center for respite care. He lives, by most accounts, in the United Kingdom. He reads. He thinks. He does not manage other people's money. The contrast with the post-retirement trajectories of other great investors — Buffett holding court at annual meetings, Soros funding political causes, Druckenmiller appearing on CNBC to opine on the macro environment — could not be starker. Sleep retired, and he meant it.
The disappearance has, predictably, intensified his mystique. The Nomad letters circulate on investment forums like samizdat, photocopied and annotated and passed from analyst to analyst with the reverence accorded to sacred texts. William Green, in his book
Richer, Wiser, Happier, devoted a chapter to Sleep, describing him as one of the investors who "deliberately fly below the radar." The Financial Times called him a "cult figure of investing" and noted that he was "one of few to grasp early promise of internet stocks" — a characterization that captures the paradox of a man who is famous precisely because he wants nothing to do with fame.
The cult has grown, and the materials are scarce.
Nick and Zak's Adventures in Capitalism, a compilation of wisdom from the partnership, circulates among devotees. Podcast episodes analyzing Sleep's letters have attracted hundreds of thousands of listens. Investment firms — NZS Capital among the most prominent, its name a direct homage (N for Nick, Z for Zak, S for Sleep) — have been founded explicitly on intellectual frameworks derived from Sleep's work. He has become, in the decade since his retirement, more influential than he ever was while managing money.
The Problem of Patience
The most commonly extracted lesson from Sleep's career is "be patient," which is both perfectly accurate and almost perfectly useless. Everyone knows that patience is a virtue in investing. The knowledge does not help. Knowing that you should hold Costco through a two-year drawdown and actually holding Costco through a two-year drawdown are experiences separated by an epistemological chasm. The interesting question is not whether patience matters but what makes it possible — what structural, psychological, and philosophical conditions allow a human being to do nothing for years while the world screams at them to act.
Sleep's answer was structural. He built Nomad so that patience was the default rather than the exception. The fee structure removed the incentive to trade. The concentrated portfolio removed the temptation to fiddle with position sizes. The investor base — charities and endowments with genuine long-term horizons — removed the pressure to report short-term results. And the letters, by articulating the philosophy in writing year after year, created a kind of commitment device: having told your partners that you believe in holding for the long term, you are psychologically bound to actually do it, because the alternative is to reveal yourself as a fraud.
But the structural answer is incomplete. Structure enables patience; it does not create the temperament for it. Sleep's patience was rooted in something deeper — a genuine indifference to the opinions of the professional investment community, a willingness to be wrong for long periods in the eyes of the world, and a conviction that the passage of time, far from being an enemy, was the single greatest source of competitive advantage available to an investor. He didn't endure the waiting. He seemed to enjoy it.
There is also, in Sleep's story, a philosophical dimension to patience that transcends investing. The decision to close Nomad was itself a supremely patient act — a willingness to wait until the work was done, to resist the compounding of fees that another decade of operation would have generated, to recognize that enough was enough. Patience, in Sleep's formulation, was not merely a tactic for generating returns. It was a way of being in the world. A refusal to be hurried. An insistence that the most important things — understanding a business, building a partnership, living a meaningful life — cannot be rushed.
What Remains
The Nomad Partnership wound down in 2014. The last letters were written. The capital was returned. The positions — Costco, Amazon, Berkshire Hathaway, and the handful of others that had compounded the fund's wealth — were sold. Two billion dollars had been created for charities and endowments that, one assumes, used the money to fund scholarships and medical research and the thousand other things that endowments fund. Sleep's portion of the proceeds — substantial, though its precise size has never been publicly disclosed — went toward whatever he decided was worth buying with a life freed from the obligation to make more money.
There is something almost unbearably romantic about this ending, and the romanticism should be treated with suspicion. The financial industry is full of people who claim to be above the fray while quietly counting their returns. Sleep's withdrawal from public life makes it impossible to evaluate whether the reality matches the legend. Perhaps he is miserable. Perhaps he is bored. Perhaps the respite care center never materialized. The opacity that he maintains is, among other things, a form of narrative control — by saying nothing, he ensures that others will fill the silence with their most flattering projections.
But the letters remain. They are the artifact, the evidence, the thing that survives the silence. And what the letters reveal, read in sequence over thirteen years, is not merely an investment philosophy but a moral one — a sustained argument that the way you make money matters as much as how much you make, that the structure of institutions determines their behavior more reliably than the intentions of the people inside them, that the businesses most worth owning are the ones that serve their customers first and their shareholders second, and that the best thing an investor can do, having found such businesses, is to get out of the way and let time do its work.
Nick Sleep, somewhere in England, is letting time do its work.
