In 1963, business for American Express was booming: half a billion dollars of traveler’s checks were in circulation and over one million people had American Express cards. Then, scandal hit. An Amex warehouse subsidiary had issued receipts to Allied Crude Vegetable Oil Refining for bogus tanks of salad oil. The receipts were used to obtain loans on which Allied subsequently defaulted. When the creditors came to seize their collateral, the bogus tanks were exposed. While perhaps not legally bound, American Express assumed moral responsibility and was on the hook for $150 million – more cash than the company had on hand. Following the incident, American Express stock fell from $60/share to $35.
As Amex’s share price fell, a little-known (at the time) investment manager named Warren Buffet purchased approximately 5% of the company. After determining that the scandal had no negative impact on cardholders’ propensity to use their Amex charge cards, Buffet concluded that the “salad oil scandal” was a one-time event from which the company could easily recover. His conviction was strong – at one point American Express accounted for more than 40% of his portfolio.