When he dies, Warren Buffett wants 90% of wife’s inheritance put into 1 investment. Here’s what it is, and how to get it

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Legendary investor Warren Buffett has generated substantial returns for the shareholders of his company, Berkshire Hathaway. From 1964 to 2025, Berkshire delivered an overall gain of 6,099,294% (1). That's over six million percent.

Given that astonishing track record, you might assume that Buffett would want this successful trajectory to continue through his estate after his passing. However, the Oracle of Omaha has a different plan in mind.

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In his 2013 letter to Berkshire shareholders, Buffett shed light on the directives he has included in his will.

"One bequest provides that cash will be delivered to a trustee for my wife's benefit," he wrote (2). "My advice to the trustee could not be more simple: Put 10% of the cash in short-term government bonds and 90% in a very low-cost S&P 500 index fund."