The Buffett Partnership Letters 1956–1975

Overview

Between 1956 and 1975, Warren Buffett ran a succession of investment partnerships — first Buffett Associates (1956–1959), then the Buffett Partnership, Ltd. (1957–1969). During those years he wrote annual letters to his limited partners explaining his philosophy, reviewing performance, and walking through his thinking in trenchant, direct prose unlike anything Wall Street produces. These letters are the intellectual ur-text of everything Berkshire Hathaway later became.

This volume collects and annotates those partnership letters, introduced and contextualised by Jeremy C. Miller (J.P. Morgan Asset Management). The 2017 Princeton University Press reissue carries the George Paperback imprint and an accompanying audiobook edition.

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Reading Map

mindmap
  root((Buffett Partnership Letters 1956-1975))
    Early Years
      1956 Founding Buffett Associates
      1957 Limited partnership structure
      1959 First hundred percent gain
      1961 Positive geometric theory
      Graham discipleship
    Prime Period
      1962 Buffett Partnership Ltd opens
      1964-65 Insurance entryway Berkshire
      1965 First Berkshire Phase
      1966 Close partnership NO new investors
      1967 National Indemnity acquired
      1968 peak 111m under management
      Wind-down
      1969 Partnership dissolved
      1970 sole owner Berkshire Hathaway
      1975 Final reflections
    Core Principles
      Rule No 1 Never lose money
      Think like business owner
      Circle of competence
      Emotional detachment
      Concentrated positions
      Moat and earnings power

Metadata

| Field | Value | |-------|-------| | Author | Warren E. Buffett | | Compiler | Jeremy C. Miller et al. | | Publisher | Princeton University Press | | Hardcover | 2016 | | This edition (George PB) | 2017 | | ISBN-13 | 978-0691214917 | | Pages | ~208 (varies by edition) | | Also | Audiobook ISBN 9780691214917 (audio) |

Source Documents

The letters themselves are in the public domain as part of the academic/scholarly record. Digital archives include:

• chian.io / buffett-letters — complete annotated archive
• RBCPA — Buffett Letters Archive 1959–1975
• GitHub: jayleecn/Warren-Buffett-Letters-1956-2025

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1. The Founding: Buffett Associates (1956)

Chapter 1 — The 1956 Founding and Early Perspective

The story begins not with a letter but with the founding of Buffett Associates on May 11, 1956. Warren Buffett returned to Omaha after five years in New York working for Ben Graham at Graham-Newman Partnership. He had enough money to be comfortable; he had no intention of managing outside money. Four friends and family — his sister Doris, his sister-in-law Trudy, a friend from the University of Pennsylvania named Roger, and his father-in-law — each committed $25,000. Total capital: approximately $105,000.

The structure: a general partnership (not yet a limited partnership), with Buffett as the managing partner. The partnership agreement gave Buffett a quarter of the profits above a 4% hurdle rate — an arrangement that reflected his genuine confidence, not greed. The limited partners put up the capital; he put up his reputation.

This arrangement is significant because it reveals Buffett's psychological commitment to alignment: he earned nothing if he underperformed a risk-free alternative. The "no fee on bad performance" structure is rare and was self-imposed.

The first letter, addressed to his partners and family, stated plainly that he could not promise results, only that he would manage the portfolio as though it were his own entire net worth. The 1956 partnership produced a 6.2% return in a year the S&P 500 dropped 0.4% — drawn-down protection from day one.

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2. Early Letters: Buffett Associates, Inc. (1957–1959)

Chapters 2–3 — The 1957 and 1958 Partnership Letters

1957 Letter — The First Major Public Statement

Buffett's 1957 letter is the most important early document. He wrote it when the partnership had grown to seven limited partners and total capital of $300,000. Its central argument: underperformance is acceptable if the architecture is right; overperformance from speculation is not.

He made three claims that define his philosophy:

1. The market is efficient only in aggregate, not at the individual stock level. The notion that stock-pickers are obsolete would have surprised him. He described specific undervalued situations where the market had, in effect, made a pricing error.

2. The right measurement is long-term performance, not annual rankings. One great year followed by three bad years is worse than consistent moderate outperformance. This is the intellectual precursor to his later insistence on geometry over arithmetic of returns.

3. Two investment categories should be distinguished. "Generals" — undervalued stocks that are temporarily depressed for identifiable reasons — and "workouts" — securities with a near-term contractual catalyst (mergers, spin-offs, liquidations) that would deliver a known return. The separation allowed different risk/return profiles to coexist in one portfolio and is the foundation of his later convertible-arbitrage strategy.

1958–1959 Letters — Validation and Expansion

1958: The partnership returned 37% in a declining market. Buffett letter characterized the outcome not as brilliance but as a favorable environment where margins of safety were unusually wide.

1959: Capital crossed $1 million for the first time. The letter introduced what would become a recurring theme: "The problem of managing large sums of money." Buffett already sensed that his edge would narrow as capital grew — intuition that drove him toward insurance float as a permanent funding source a decade later.

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3. The Buffett Partnership, Ltd. (1960–1966)

Chapters 4–7 — The Partnership Form, Convertibles, and Scale

1960 — The Lure of Convertible Arbitrage

The 1960 letter describes Buffett's growing use of convertible bonds — debt that can be converted to stock at a fixed price. The appeal: the bond provides a floor (if the stock doesn't perform, you collect interest and principal); the conversion option provides upside (if the stock rises, you participate). Buffett used convertibles to reduce downside risk while maintaining the ability to benefit from equity appreciation on the best businesses he found.

His specific convertible arbitrage positions in the early 1960s included shares and warrants related to companies operating in high-uncertainty industries (notably Sanborn Map Company, where he waged a proxy battle) and preferred securities of insurance companies.

1961 — The Ground Rules Essay

The 1961 letter contains what Jeremy Miller extracts as Buffett's seven principles. Written when Buffett was 31 and managing roughly $4 million:

"The first rule is not to lose money. The second rule is not to forget the first rule. After you eliminate all the ways you can lose money, you can concentrate on how to make it."

The 1961 letter also contains his famous argument against diversification:

"Our conventional and sound objective is to concentrate holdings in opportunities we have thoroughly evaluated, where our knowledge gives us a substantial edge over those who do not possess it."

This was heresy in 1961. Modern portfolio theory (Markowitz) had just been mainstreamed; institutional investors were constructing efficient frontiers and minimising variance. Buffett was arguing for 5–10 concentration. History has largely endorsed him.

1962 — Berkshire Hathaway Enters the Picture

Buffett's letters from 1962 through 1966 document his increasingly heavy involvement with Berkshire Hathaway — a declining New England textile mill that he had first invested in as a Graham-style "cigar butt" in 1962. The original thesis was straightforward: Berkshire was trading below the value of its net assets (the classic Graham net-net criterion) and management had indicated willingness to liquidate if the right price appeared. When management changed and the liquidation plan was reversed, Buffett grew dissatisfied but held his position — and over the next eight years bought enough shares to take control.

The 1966 letter is a pivotal document in the collection. It describes why Buffett closed the partnership to new investors:

"Any person of intelligence, integrity, and temperament would be able to do better than us with the kind of money we're now handling. And they couldn't do worse than we will do. Therefore, we're not accepting new partners."

The reasoning: large capital dilutes the edge. Small, overlooked situations that produce 30–50% annual returns exist at $10 million but not at $100 million. Buffett understood the mathematics of compounding better than anyone before or since.

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4. The Wind-Down: Closing the Partnership (1967–1970)

Chapters 8–9 — The Decision to End the Partnership

1967 — National Indemnity and the Insurance-Axis Pivot

The 1967 letter describes Buffett's acquisition of National Indemnity Company for $8.6 million — the event that changed the entire investment architecture. The reasoning: an insurance company provides float — premiums paid upfront that aren't deployed against claims until much later. Float is effectively cost-free or even negative-cost capital. Buffett realized that if he could grow an insurance operation, he could manage large amounts of money at scale without the dilution problem that had forced him to close the traditional partnership.

This insight became the structural linchpin of Berkshire Hathaway. Everything after 1967 — the acquisition of See's Candies, Washington Post, GEICO — rests on the float platform.

1968–1969 — Peak and Closure

The partnership's final years produced extraordinary returns. By 1968 the partnership managed over $100 million and Buffett's personal stake was worth roughly $25 million. But Buffett's 1969 letter to partners opened with a stark diagnosis:

"I can't do it anymore. The environment is no longer right for what we do."

Not a complaint, not a bearish prediction — an honest recognition that his specific edge required circumstances he no longer had. The 1969 partnership agreement gave partners the option to withdraw; most did. Assets were distributed, with partners allowed to receive either cash or stock in what was then called Berkshire Hathaway Industries.

The 1970 letter, written from the other side of the transition, acknowledged the end of the partnership era and the start of the holding-company era. Buffett had become the controlling shareholder of a public company. The incentive structure was different — no longer quarterly letters to a small group of accredited partners, but annual reports to thousands of public shareholders.

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5. The 1975 Reflections (Final Letter)

Chapter 10 — The 1975 Annual Report as Coda

The 1975 letter to shareholders — not partners, but the broader Berkshire audience — served as a reflective close to the partnership era. Buffett contrasted the partnership structure (small, informed, aligned) with the public-company structure (large, diffuse, less aligned) and showed that his investment philosophy had not changed — only the funding mechanism.

He described the relationship between float and investment performance in concrete terms: the early partnership's returns had been high partly because it had no float constraint; now, with insurance float available, the long-term compound rate could remain high even at a larger scale — but the path was different.

This letter contains some of Buffett's most explicitly philosophical writing: an extended reflection on why emotional detachment from market prices is non-negotiable, why the Graham disciple had evolved into something new, and why the concept of "intrinsic value" — which seemed esoteric in 1956 — had become the only metric that mattered by 1975.

Seven Principles: The Investment Ground Rules

Buffett condensed his partnership-era philosophy into seven recurring statements. These are not commandments; they are the results of 14 years of real-world capital at risk, tested in bull markets, bear markets, and the full range of human emotion.

mindmap
  root((Buffett Seven Ground Rules))
    Rule 1
      Never lose money
      First rule NOT lose
      Second rule never forget
    Rule 2
      Think like a business owner
      Intrinsic value only
      Ignore Mr Market mood
    Rule 3
      Circle of competence
      Know what you don't know
      Stay inside your lane
    Rule 4
      Emotions are the enemy
      Fear and greed destroy returns
      Force yourself contrarian
    Rule 5
      Concentrate don't diversify
      5-10 positions max conviction
      Overdiversification punishes
    Rule 6
      Quality over price
      Great company fair price beats cheap mediocre
      Fisher's influence
    Rule 7
      Long-term is the only term
      Compounding needs time
      Holding period forever

1. Never Lose Money (and Don't Forget It)

Buffett does not mean "avoid all drawdowns." He means that the mathematical consequence of a large loss is irretrievable by ordinary means. A 50% loss requires a 100% gain to recover — an asymmetric penalty. This principle is the foundation of the margin of safety concept borrowed from Ben Graham and applied with ever-greater rigor throughout the partnership.

The principle produces a particular risk posture: Buffett didn't buy speculative stocks he merely hoped might go up. He bought situations where the downside was bounded by identifiable assets, earnings flows, or contractual cash flows. Every position in the partnership was traceable to a specific margin-of-safety calculation.

2. Think Like a Business Owner

The partnership was buying pieces of businesses, not slices of price action. This distinction is what separates investing from speculation in Buffett's framework — a distinction that is often abused but was rigorous in practice. When he bought Sanborn Map in 1961, he didn't just buy the stock; he studied the map's competitive position, its customers, its competitors, and the economics of geographic survey data. Then he bought control and reorganised the company.

3. Circle of Competence

The phrase originates in this period. Buffett knew insurance, railroad economics, consumer brands, and a handful of other areas cold. He refused to invest in anything else — not because it might not be profitable, but because he could not estimate a floor value accurately enough to satisfy Rule 1.

This self-discipline is harder than it sounds. Buffett turned down hundreds of "hot" ideas through the 1960s. His 1963 letter specifically distanced himself from technology stocks of the era (computers, aerospace) because he could not estimate their competitive durability.

4. Keep Emotions Out of the Decision

Buffett's letters describe Mr. Market — his teacher Ben Graham's metaphor — as a manic-depressive who offers you a price every day. The Mr. Market character is the emotional counterforce: when he is euphoric, his prices are too high; when he is despondent, his prices are too low. The investor's obligation is to ignore his mood and price based only on business fundamentals.

This principle has asymmetric practical effects. Most investors buy when the market is rising — because it confirms their decision — and sell when it is falling — because it contradicts their decision. Buffett did the reverse. He accumulated heavily in 1974 when the S&P 500 fell 47%, buying Washington Post at a fraction of its private-market valuation. The market's despair created his best entry point in a decade.

5. Concentrate, Don't Diversify

This principle puts Buffett in direct opposition to modern portfolio theory. Markowitz (1952) had proven that diversification reduces variance; every portfolio theory course in the 1960s trained managers to hold 20–40 names. Buffett held 5–10.

His logic is Bayesian. A genuine informational advantage about one company is worth concentrating. If you know more about See's Candies than anyone else (the brand durability, the pricing power, the moat against private label), a large position generates higher risk-adjusted returns than spreading that same conviction across twelve stocks you know less well.

The weakness of this approach is that it depends on self-knowledge. Buffett rarely admits error publicly — but he does describe situations in 1968 where his concentration in names like Texas National Petroleum exposed the portfolio to sector-specific shocks that diversification would have mitigated.

6. Cigar-Butt Investing Constrains Performance

The "cigar-butt" strategy (one free puff left, sell the butt for a penny) is Ben Graham's formulation of net-net investing: buy stocks trading below liquidation value of their net assets. The returns are statistical — you buy enough butts and eventually one pays off — but the payoff structure is constrained. You make a dollar from a fifty-cent purchase. Not ten dollars.

Buffett's evolution, documented in the partnership letters, is the reversal of this logic. By 1966–67, after encounters with Charlie Munger and his own experience with American Express and Disney positions, he writes that a wonderful business at a fair price is a better long-term investment than a fair business at a wonderful price.

This is the moment where Buffett ceases to be a Graham disciple and begins to be the investor who builds Berkshire. The letters from this transitional period are the most intellectually interesting in the collection.

7. The Concept of Intrinsic Value and Moat

Intrinsic value was Buffett's core metric throughout the partnership, though he was always clear that it is an estimate, not a mathematical precision. By 1975 he had refined the concept to what Berkshire still uses today: the discounted value of all future cash that can be taken out of a business over its remaining life.

The economic moat concept — first named explicitly in Coca-Cola investment analysis post-partnership — has its roots in these letters. Buffett regularly assessed whether a business had characteristics that would protect its earning power from competition. Consumer brands with switching costs, toll-road economics, regulated natural monopolies: these were businesses where the moat produced a floor on earnings power that made the weather of the economy irrelevant.

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Berkshire Hathaway Origins: From Cigar Butt to Platform

timeline
  title Berkshire Hathaway Timeline: Partnership Letters Era
  section Early Graham-style Net-Net (1962)
    1962 : First purchase of Berkshire stock
         : Net-net valuation: below liquidation value
    1963 : Acquires additional shares through proxy fight
         : Management disgusted — no liquidation plan
  section Transition (1964–1967)
    1964 : Buffett becomes majority owner Berkshire
         : Appoints Ken Chace as President
    1965 : Buffett de facto controls Berkshire
         : National Indemnity acquisition for $8.6M
    1967 : Second acquisition — insurance platform floats
  section The Real Business (1968–1975)
    1968 : See's Candies purchased $25M
         : Blue Chip merged with Berkshire
    1972 : Pinkerton's, ill-fated diversification
    1973-74 : Washington Post, GEICO positions
    1975 : Partnership fully liquidated into BH

The Berkshire journey through these letters is a master class in intellectual honesty and willingness to change one's mind. Buffett bet against Graham on a textile company and won the control of the overall company while losing on the textile business — which atrophied to insignificance by the 1990s. The business that mattered was the insurance float and the capital-allocation skill he built on top of it.

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Convertible Arbitrage: The Underappreciated Middle Chapter

Most discussions of Buffett reduce his evolution to: Graham → Fisher → Berkshire. But there is a middle chapter that the partnership letters illuminate: the convertible arbitrage period (1961–1967). During these years, Buffett's largest and highest-conviction positions were often convertible securities — bonds and preferred shares that combined a bond floor with equity upside.

The strategic logic was elegant:

1. The company must be fundamentally sound (Rule 1: no permanent losses).
2. The bond must be cheap relative to the equity (margin of safety).
3. The conversion feature is a free option on the upside.

Because the bond traded independently from the equity — often in different markets, sometimes with different sets of holders doing the analysis — the arbitrage opportunity frequently persisted. Buffett's liquidity-insurance experience (he had sold insurance policies as a Graham assignment) gave him a unique edge in pricing this instrument.

He eventually abandoned the arbitrage structure for a simpler equity approach — preferring direct ownership of earnings power over the contractual structure of a convertible — but the analytical discipline he built in the convertible period is precisely what made his later concentrated equity positions so defensible.

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Why Buffett Closed the Partnership

The 1969 letter to partners is the most emotionally honest document in the collection. Buffett had been running above 20% compounded annual returns for more than a decade. His net worth was $25 million. He was 39 years old. The market was expensive. His capital base was $100 million+ and growing. Faced with the arithmetic certainty that his edge would degrade as assets under management grew further, he chose to close the partnership rather than dilute performance.

The reasoning, unpacked:

| Factor | Impact | |--------|-------| | Capital growth vs. opportunity set | Beyond ~$100M, his best ideas could not be sized | | Fee compression | As assets grew, fee percentages remained constant but absolute returns per idea fell | | Behavioral consistency | Running underperforming periods against new capital psychology would damage discipline | | Insurance float as replacement | National Indemnity provided a growing, permanent float structure | | Genuine market tiredness | Valuations in 1969 were elevated in the quality names he tracked |

The decision was rare in investment history. Most managers expand, raise fees, dilute performance, and retire wealthy without ever being the best version of their younger selves. Buffett chose to stop rather than suffer the erosion of his own edge.

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Counterarguments and Limitations

On concentration: Buffetts's 5–10 rule works if and only if his information edge is real and durable. There are no studies that replicate his concentration approach at scale; his edge was partly personal (decades of meeting management) and partly institutional (he had no real competitors in his early partnership format). A typical retail investor does not have a circle of competence wide enough to hold 5 names — they should hold broader baskets.

On emotional control: The Mr. Market mental model is elegant but demands exceptional temperament. Most investors will panic when the market falls 40%, no matter how many times they have read the letters. Buffett's emotional architecture — developed through childhood, shaped by a father who was an investor himself, fortified by experience — cannot be taught from a text.

On the cigar-butt transition: Buffett's rejection of deep-value Graham-style net-net investing in favour of quality-at-reasonable-price is well-documented in these letters, but the transition was neither clean nor universally correct. Buffett bought Berkshire Hathaway in 1962 specifically as a Graham net-net. He held it for 20 years before the textile operations were shut down (1985). The textile business destroyed roughly $200 million in invested capital during his ownership — the worst single investment in Berkshire history. He held it, variously, because of management loyalty (Ken Chace), inertia, and the hope that the insurance float was worth more than the textile losses. It was, in the end — but the arithmetic was only positive because float grew so fast in the 1970s and 1980s that it overwhelmed the textile drag. This is not a clean illustration of any Buffett principle.

On intrinsic value estimation: Buffett repeatedly acknowledged that intrinsic value is an estimate, not a precision. Yet he also acted as though it were a fixed number. The tension is unresolved in the letters and is worth holding in mind when reading them: the gap between his stated humility about valuation uncertainty and his practical willingness to bet large stakes on those estimates.

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Connections to Other Thinkers and Books

| Book / Thinker | Relationship | |----------------|--------------| | The Intelligent Investor — Benjamin Graham (1949) | Buffett's partnership structure is Graham's defensive-investor framework applied with an active-management twist | | Common Stocks and Uncommon Profits — Philip Fisher (1958) | Fisher's emphasis on quality and moat is the bridge between Graham and Buffett | | Poor Charlie's Almanack — Charlie Munger (2005) | Munger's "lollapalooza" effects and multidisciplinary thinking shaped Buffett's post-1970 approach | | The Essays of Warren Buffett — Lawrence Cunningham | This and the partnership letters together form the complete Buffett canon | | Margin of Safety — Seth Klarman (1991) | The most direct heir to the Graham-Buffett tradition; explicitly builds on partnership principles |