48 years · 5 decades · 1 philosophy
Buffett took over a dying textile business and methodically pivoted toward insurance. He introduced what would become his signature metric — return on equity — arguing that raw earnings-per-share growth was meaningless without context of the capital deployed to produce it.
He openly admitted textile mistakes and praised manager Ken Chace, whose operational discipline generated the cash that funded insurance acquisitions. This era also saw Buffett buying stocks like a business analyst, not a trader — holding Washington Post shares even as they fell 25%.
Insurance "float" — premiums collected before claims are paid — became Berkshire's central financing engine. Buffett explained that if underwriting was disciplined, this float was essentially free money to invest. By 1987, seven core businesses were generating ~57% returns on equity.
In 1985 he closed the textile mills and blamed himself for waiting too long. He also coined what became his M&A touchstone — managers who overpay for acquisitions are like princesses who kiss toads expecting princes, wasting shareholder money on wishful thinking.
Charlie Munger's influence pushed Buffett fully away from Graham-style "cigar butt" bargain hunting. The 1990s letters developed the concept of "economic moats" — durable competitive advantages like brand strength, switching costs, or network effects that protect returns over decades. See's Candy became his favourite textbook example: bought for $25M in 1972, it required almost no capital reinvestment yet grew earnings relentlessly.
In 1995 Berkshire completed its full buyout of GEICO — a 50-year love affair Buffett traced back to a cold Saturday morning visit in 1951. He paid $2.3 billion for the other half, calling it steep but justified by GEICO's structural cost advantage in auto insurance.
As tech stocks soared, Buffett repeatedly warned shareholders that Berkshire would underperform in speculative markets — not because he was wrong, but because he refused to buy what he couldn't value. In 1998 he formally published his "Owner's Manual" — 13 principles defining the partnership between Berkshire management and shareholders. He also wrote some of his most vivid prose about intrinsic value vs. book value.
He also warned about using stock to pay for acquisitions — calling his Dexter Shoe deal (paid in Berkshire stock) one of his worst mistakes, because the stock he gave away kept compounding magnificently while the business he received collapsed.
The dot-com collapse validated Buffett's 1990s caution. His 2001 letter opened with unusual gravity after 9/11 — he noted that insurance is the ultimate test of character, and Berkshire paid its claims promptly despite massive losses. He wrote extensively about how derivatives had become "financial weapons of mass destruction," warning that their complexity masked real counterparty risk long before 2008 proved him right.
He also began quantifying Berkshire's four-part structure: insurance float, owned businesses, equity investments, and finance subsidiaries — giving shareholders a framework to estimate intrinsic value themselves rather than relying on book value alone.
Buffett's 2008 crisis response was his most celebrated decade act. While markets panicked, he deployed Berkshire's cash into Goldman Sachs preferred stock (5B at 10% yield), General Electric, and other distressed names. He wrote a famous New York Times op-ed — "Buy American. I Am." — urging others to do the same. In 2009 Berkshire made its largest acquisition ever: BNSF Railway for $26 billion, a bet on the long-run American economy.
He also admitted that he had missed the severity of housing-related losses and owned too many financial stocks. Intellectual honesty remained his defining personal trait across 30+ letters.
Berkshire's sheer scale became the primary strategic constraint. With $500B+ in assets, elephant-sized acquisitions were the only way to move the needle. In his landmark 2014 "50th anniversary" letter, Buffett looked back at the full arc of Berkshire's transformation — from failing textile mill to one of the most valuable companies on Earth — and credited five "key decisions": insurance float, decentralized management, avoiding leverage, retaining earnings, and picking the right people.
He began advocating index funds openly for ordinary investors, saying that the S&P 500 with low costs would beat the vast majority of active fund managers over 10-year periods. He proposed a famous bet — $1 million on the S&P vs. a hedge fund of funds — and won it handily by 2017.
Buffett's biggest 2010s investment wasn't in insurance or railways — it was Apple, a consumer brand with extraordinary switching costs and loyalty. He came to see Apple less as a tech company and more as a consumer-staples business with unmatched pricing power. By 2018 it was Berkshire's largest single position. He also embraced share buybacks aggressively — arguing that when Berkshire trades below intrinsic value, buying back stock is the highest-return capital allocation available.
Succession planning became explicit. He identified Greg Abel for non-insurance operations and Ajit Jain for insurance as the two pillars of Berkshire's next generation.
Buffett's 2020 letter opened with COVID's shadow but refused to predict the trajectory of the pandemic or economy — instead reaffirming Berkshire's core promise: it will never need government help, never require debt markets, and will always be able to meet obligations. He discussed Berkshire's buyback activity (the largest ever at $24.7 billion in 2020) as evidence of conviction in intrinsic value. He also introduced a novel Japan strategy: buying stakes in five major Japanese trading houses — patient, diversified bets on businesses trading below replacement value.
The 2023 letter opened with a moving tribute to Charlie Munger, who died in November 2023 aged 99. Buffett called him the true "architect" of Berkshire while calling himself the "general contractor." He noted Charlie corrected him in 1965 — "abandon everything Ben Graham taught you" — and every correction since then made Berkshire richer. By 2024, Berkshire held over $300 billion in cash — a signal of scarcity of good opportunities at sensible prices, not pessimism about America.
In 2025 Buffett announced he would retire as CEO at year end, with Greg Abel taking over. The 2025 letter — written by Greg Abel — committed to preserving Berkshire's culture of partnership, decentralisation, and extreme financial conservatism. Buffett stays on as Chairman.