How Warren Buffett Beat the S&P 500

In brief

Warren Buffett and Berkshire Hathaway beat the S&P 500 over an extraordinary period, but not through a single stock-picking formula and not every year.

Berkshire’s own 2025 annual report shows a 19.7% compounded annual gain in per-share market value from 1965 through 2025, compared with 10.5% for the S&P 500 including dividends. Compounding those different rates for six decades produced a vast difference in ending wealth. The same issuer table shows that Berkshire sometimes trailed the index—occasionally by a wide margin.

My reading of the evidence is that Buffett’s result was not adequately explained by luck alone. It came from a rare combination of:

• buying understandable businesses at prices below a conservative estimate of value;
• evolving from statistically cheap “cigar butts” toward high-quality companies with durable economics;
• concentrating capital when conviction and opportunity were unusually strong;
• holding successful businesses for long periods, reducing turnover and allowing deferred taxes to compound;
• using insurance float as a scalable source of financing while maintaining exceptional liquidity;
• acquiring entire businesses and allocating their cash across Berkshire; and
• having the temperament and organizational freedom to remain patient during market extremes.

Luck still mattered. Buffett has repeatedly acknowledged the advantages of where and when he was born. Favorable circumstances, exceptional partners—especially Charlie Munger—and the path by which Berkshire obtained insurance float were not inevitable. The fairest conclusion is therefore skill operating through a favorable but uncertain historical path, not luck versus skill as mutually exclusive explanations.

First, define what “Buffett’s portfolio” means

There are three related records that are often blended together:

1. Buffett Partnership performance before Berkshire became his main vehicle;
2. Berkshire Hathaway stock, which represents operating subsidiaries, insurance operations, cash, fixed-income assets, listed stocks, taxes, liabilities, and capital-allocation decisions; and
3. Berkshire’s reported U.S. equity holdings, a delayed Form 13F snapshot that excludes much of the company.

The 40-year charts in this article compare Berkshire’s per-share market-value return with the S&P 500 total return, using the annual figures Berkshire publishes. They do not backtest today’s Apple-, American Express-, or Coca-Cola-heavy 13F holdings into years when Berkshire did not own those positions.

That distinction is essential. Berkshire is a corporation, not a mutual fund. Its shareholder return reflects far more than its visible stock portfolio.

The 40-year comparison: 1986–2025

The official annual-return table allows a consistent comparison across 40 complete calendar years. Compounding the reported figures from 1986 through 2025 produces the following illustrative, before-tax result:

Measure	Berkshire	S&P 500 with dividends
Hypothetical starting value	$10,000	$10,000
Hypothetical ending value	About $3.05 million	About $769,328
Annualized return calculated from displayed figures	About 15.4%	About 11.5%
Calendar years ahead of the other series	25	15

These calculations use annual returns rounded to one decimal place in Berkshire Hathaway’s 2025 Annual Report. They may differ slightly from calculations based on unrounded daily data.

The larger lesson is not that Berkshire won every year. It did not. Berkshire substantially trailed during parts of the late-1990s technology boom and in several growth-led markets after the financial crisis. The historical advantage came from the combined magnitude and sequence of many gains and losses across decades.

From Omaha to the “Oracle of Omaha”

Buffett was born in Omaha, Nebraska, in 1930 and built his career far from Wall Street’s physical center. The financial press eventually attached “Oracle of Omaha” to his reputation for investment judgment and the location that remained his home and Berkshire’s headquarters. The nickname is useful shorthand, but it can make a long institutional history sound like one person predicting markets.

Buffett’s intellectual starting point was Benjamin Graham. Graham’s discipline emphasized buying securities for less than a conservative estimate of underlying value and demanding a margin of safety. Early Buffett investments often followed the cigar-butt pattern: an unattractive or declining company bought cheaply enough to offer one remaining economic “puff.”

Buffett formed investment partnerships in the 1950s. One of their purchases was Berkshire Hathaway, a New England textile manufacturer. In the 2014 shareholder letter, Buffett reconstructed the episode with unusual candor. Berkshire was a poor business, and an emotional dispute over a tender price contributed to his decision to take control in 1965. He later described the purchase as a major mistake.

That mistake became the legal shell for a radically different enterprise.

Berkshire Hathaway before Buffett

The Berkshire name did not begin as an investment company. The 2021 annual report traces the modern company to the 1955 merger of Berkshire Fine Spinning Associates and Hathaway Manufacturing. The combined textile operation faced relentless competitive pressure.

Buffett initially approached Berkshire as a cheap security whose mills were being closed and whose capital might be released. After gaining control, he kept the textile operation alive for years, but its economics continued to disappoint. Berkshire eventually exited textiles in 1985.

The transformation had already begun elsewhere. Berkshire bought National Indemnity in 1967, establishing insurance as a core source of operating earnings and investable float. It acquired See’s Candies in 1972, a transaction often associated with Charlie Munger’s influence on Buffett’s thinking. See’s did not look statistically cheap relative to its tangible assets, but its brand, customer loyalty, and pricing power allowed it to earn attractive returns without requiring comparable amounts of new capital.

That experience helped move Berkshire from buying mediocre businesses at very cheap prices toward buying excellent businesses at sensible prices.

Over time, Berkshire became a decentralized conglomerate spanning insurance, rail transport, energy, manufacturing, service, and retail, while retaining a large portfolio of listed securities. The company’s form matters: cash generated by one subsidiary can be redeployed into another business, a public stock, an acquisition, Treasury bills, or Berkshire’s own shares.

The strategy was broader than value-stock screening

Buffett is called a value investor, but “buy stocks with low price-to-book ratios” is an incomplete description. His process evolved, and Berkshire’s scale required it to evolve again.

1. Treat a stock as part ownership of a business

The central question is not whether a ticker will rise next quarter. It is what the underlying business can earn over time, how much capital it requires, how durable those economics are, and whether the purchase price leaves a margin for error.

This business-owner orientation supports patience. If the business continues to compound intrinsic value, daily market quotations become offers rather than instructions.

2. Stay within a circle of competence

Buffett has repeatedly emphasized understanding the economics of a business before investing. The circle need not be large; its boundary needs to be honest.

This principle reduces some forms of error but creates others. Avoiding industries that are difficult to understand can mean missing major winners. Berkshire’s record includes periods when investors concluded Buffett had fallen behind a changed market. Discipline and opportunity cost coexist.

3. Prefer durable economics and capable managers

The mature Berkshire approach seeks businesses with sustainable competitive advantages, attractive returns on capital, dependable cash generation, and managers who treat owners’ capital carefully.

The 2025 Berkshire letter summarizes the continuing capital-allocation framework: understand the business, seek durable advantages and long-term prospects, partner with high-integrity leaders, concentrate in high-conviction ideas, and allow compounding to unfold.

4. Concentrate when the odds appear favorable

Berkshire has often allowed a small number of positions or businesses to drive a large share of value. Concentration magnifies the benefit of being right and the damage from being wrong.

This is not a beginner-friendly instruction to own only a few stocks. Buffett developed unusual analytical skill, access, experience, and loss tolerance. Berkshire also surrounds concentrated equity positions with operating businesses, large liquidity reserves, and insurance risk controls that an individual portfolio may not possess.

5. Hold, defer taxes, and minimize unnecessary activity

Long holding periods permit business earnings to compound while deferring capital-gains taxes on unrealized appreciation. Low turnover also limits trading costs and the behavioral mistakes that can accompany constant decision-making.

Holding is not the same as refusing to update a thesis. Berkshire has sold major positions. The advantage is the absence of a requirement to trade merely because a quarter ended or a benchmark changed.

6. Allocate capital across multiple channels

Buffett’s job at Berkshire was not simply choosing stocks. It included deciding among:

• reinvesting in existing subsidiaries;
• acquiring entire companies;
• buying minority stakes in public companies;
• holding cash and Treasury securities;
• repurchasing Berkshire shares below a conservative estimate of intrinsic value; and
• occasionally returning capital through other means.

This flexibility is a major difference from a fully invested equity fund.

Insurance float: an important advantage with real risk

Insurance premiums are generally received before claims are paid. The funds held in the interval are called float. If underwriting is profitable, an insurer may effectively be paid to hold capital that can be invested until claims come due.

Berkshire built large insurance operations, including National Indemnity, GEICO, and reinsurance businesses. Float gave Berkshire a form of financing that differed from an ordinary margin loan: it was tied to insurance liabilities, could be long-lived, and historically was often low-cost.

Float is not free money. Claims can arrive unexpectedly, catastrophe losses can be severe, and poor underwriting can make financing extremely expensive. Berkshire’s ability to use float depended on underwriting discipline, liquidity, creditworthiness, and a willingness to hold enough safe assets to survive adverse scenarios.

This is one reason a retail investor cannot reproduce Buffett merely by borrowing to buy “quality” stocks. The financing structure and survival constraints matter as much as the selected securities.

Was it skill, luck, leverage, or factors?

A serious answer has to allow more than one cause.

The case against pure luck

Andrea Frazzini, David Kabiller, and Lasse Heje Pedersen examined Berkshire in “Buffett’s Alpha”. Their study found an exceptional long-term risk-adjusted record and argued that Buffett’s returns were associated with buying stocks that were relatively cheap, safe, and high quality, then applying moderate leverage. They also found that Berkshire’s public stocks performed especially well in their decomposition.

Gerald Martin and John Puthenpurackal studied Berkshire’s equity portfolio in “Imitation Is the Sincerest Form of Flattery”. Their evidence supported investment skill rather than a simple chance explanation and cautioned against reducing Berkshire to a conventional low-multiple value portfolio.

These studies do not prove that every decision was skillful or that the record could be repeated. They do make “he was merely the survivor of a coin-flipping contest” an incomplete explanation.

What factor analysis explains

Academic factor analysis can identify repeatable characteristics in Berkshire’s holdings and returns:

• lower market beta than a highly speculative portfolio;
• preference for profitable, financially stable businesses;
• value sensitivity, though not always a simple low-price-to-book tilt;
• concentration; and
• leverage that magnified the return of the underlying assets.

Calling these “factors” does not erase skill. Buffett applied the ideas before quality and defensive factors were packaged as investable products, maintained them for decades, and built an organization capable of financing and surviving the strategy.

At the same time, factor evidence demystifies the result. Berkshire’s record was not generated by clairvoyant market timing. Much of it can be understood as disciplined exposure to economically sensible characteristics, careful financing, and unusually long implementation.

Where luck enters

Luck influenced the opportunity set and the path:

• Buffett was born in the United States during a period of extraordinary long-run economic growth;
• he encountered Graham and later Munger;
• Berkshire gained access to scalable insurance float;
• specific acquisitions and counterparties became available at particular moments;
• some concentrated investments succeeded far beyond what could have been known with certainty; and
• Berkshire survived the mistakes and drawdowns that could have ended a more fragile operation.

Buffett himself has acknowledged his favorable “ovarian lottery.” Recognizing luck does not negate preparation or judgment. It prevents hindsight from turning uncertain decisions into inevitable outcomes.

The role of Charlie Munger

Any history centered only on Buffett is incomplete. Charlie Munger pushed Berkshire toward businesses with superior economics rather than bargains defined only by liquidation value or accounting assets.

The shift can be summarized as moving from cheapness first to quality at a rational price. See’s Candies became the durable teaching example: an intangible franchise could be worth far more than its recorded tangible capital because customers accepted price increases and the business generated cash without demanding heavy reinvestment.

Munger also reinforced Berkshire’s preference for simple incentives, decentralized management, rational decision-making, and avoidance of permanent capital loss. The partnership mattered not because the two men agreed on everything, but because Munger changed the kinds of businesses Berkshire was willing to value highly.

Berkshire’s failures are part of the explanation

The clean myth says Buffett always identified wonderful businesses and held them forever. The historical record is messier:

• Berkshire itself began as a value trap and remained in textiles too long;
• some acquisitions consumed capital without producing the expected economics;
• Berkshire sometimes paid too much;
• concentrated positions suffered large drawdowns;
• avoiding unfamiliar technology protected Berkshire in some periods and created opportunity costs in others; and
• the company’s scale increasingly limited the universe of investments large enough to matter.

Studying failure helps explain the success. Buffett and Munger were willing to discuss mistakes publicly, revise their framework, and avoid repeating certain categories of error. A strategy is more robust when it includes a process for learning, not merely a list of famous winners.

Why the advantage became harder to sustain

Size is the natural enemy of exceptional percentage returns. A small partnership can buy overlooked securities that would be irrelevant to Berkshire. A company with hundreds of billions of dollars to deploy needs opportunities large enough to move total value.

Berkshire’s own communications have repeatedly warned that past rates are not repeatable at current scale. The 2025 annual report’s 19.7% rate describes history, not management guidance.

Market structure also changed. Information became faster and more widely distributed, institutions grew, factor strategies became common, and Berkshire’s methods became famous. None of that makes markets perfectly efficient, but it makes obvious bargains harder to exploit with enormous sums.

What an individual investor can—and cannot—copy

An investor can reasonably borrow principles:

• think in years rather than headlines;
• understand what is owned;
• distinguish price from value;
• control fees, taxes, and turnover;
• demand financial resilience;
• avoid forced selling;
• keep a written thesis and update it when facts change; and
• wait when no opportunity offers an adequate margin of safety.

What is difficult or dangerous to copy:

• Berkshire’s insurance-funded leverage;
• its access to negotiated preferred securities and private transactions;
• its ability to buy entire companies;
• extreme concentration without comparable analytical depth and financial reserves;
• Berkshire’s tax and corporate structure; and
• the benefit of permanent capital with shareholders trained to tolerate long periods of relative underperformance.

For many people, Buffett’s most practical public advice remains low-cost index investing. Admiring an exceptional active investor does not imply that every investor should attempt to select individual stocks.

My conclusion: not magic, not a template, and not merely luck

Buffett mostly beat the S&P 500 because he combined business analysis, valuation discipline, concentration, patience, tax-aware holding, and unusually effective capital allocation inside a structure supported by insurance float and permanent capital.

The record includes luck, but luck alone does not explain the consistency, magnitude, institutional design, or documented investment characteristics. Skill is the stronger explanation—provided “skill” includes building a system that could finance good assets, withstand bad periods, learn from mistakes, and keep compounding.

The wrong lesson is that anyone can reproduce Berkshire by copying its latest 13F filing or buying a handful of companies Buffett once owned. The better lesson is that process, financing, temperament, incentives, and time horizon shape results alongside security selection.