Warren Buffett’s 1963 acquisition of American Express shares remains a seminal moment in the evolution of value investing, marking a transition from Ben Graham’s quantitative net-net approach to a more nuanced focus on durable competitive advantages. The investment was precipitated by the Salad Oil Scandal, a massive fraud orchestrated by Anthony De Angelis of the Allied Crude Vegetable Oil Refining Company. By leveraging fraudulent warehouse receipts for soybean oil that was largely non-existent—tanks were filled with water and topped with a thin layer of oil to fool inspectors—De Angelis secured loans that eventually collapsed, leaving American Express’s warehousing subsidiary liable for approximately 150 million dollars in claims.
The market reaction was swift and severe. American Express stock, which had traded near 60 dollars per share in late 1963, plummeted to 35 dollars by early 1964, representing a decline of roughly 42 percent. At the time, the potential 150 million dollar liability loomed over a company that earned only about 12.5 million dollars annually. To many institutional investors, the company appeared potentially insolvent or, at the very least, faced years of legal paralysis. However, Buffett’s analytical framework focused on the distinction between a one-time balance sheet shock and the ongoing cash-generation power of the core franchise. He recognized that while the warehousing subsidiary was compromised, the American Express Traveler’s Cheque and the nascent credit card business remained fundamentally sound.
Buffett’s research methodology for this trade was notably qualitative and observational. He spent time at restaurants and drugstores in Omaha, observing whether consumers and merchants were still accepting American Express traveler’s checks and credit cards. His findings confirmed that the brand’s utility and trust remained intact despite the corporate-level legal turmoil. This indicated that the company’s moat—its network effect and consumer trust—was not impaired. From a quantitative perspective, Buffett identified that the company’s float—the interest-free capital held between the purchase and redemption of traveler’s checks—provided a massive, low-cost capital base that the market was discounting due to the scandal. At the time, American Express held a 66 percent market share in traveler’s checks, a dominant position that competitors like Bank of America had failed to erode over decades.
In an extraordinary display of conviction, Buffett committed 13 million dollars to the position, representing 40 percent of the total assets of the Buffett Partnership. This level of concentration is rare in modern portfolio management but was justified by the asymmetric risk-reward profile Buffett identified. He calculated that even if the full 150 million dollar liability were realized, the company’s earning power and brand equity would allow it to recover over a multi-year horizon. The actual settlement ended up being significantly lower, around 60 million dollars, which the company was able to absorb through earnings and reserves without permanent damage to its capital structure.
The results were transformative for the partnership. By 1967, the stock had tripled from Buffett’s entry price, vindicating his thesis that the market often overreacts to legal uncertainty when the underlying economic engine remains functional. For contemporary portfolio managers, the American Express case study offers two critical lessons. First, it highlights the importance of distinguishing between risk, which is the probability of permanent capital loss, and uncertainty, which is a lack of clarity regarding a specific event. Second, it underscores the value of concentrated bets when a high-quality business with a dominant market share experiences a temporary, non-systemic crisis. The 1963 investment remains a textbook example of how a margin of safety can be found not just in tangible assets, but in the enduring strength of a consumer franchise.