Warren Buffett. Alex Wong / Getty Images Warren Buffett's Berkshire Hathaway bet $2.1 billion on Bank of America stock in the summer of 2020. The investor's company has nearly doubled its money thanks to the stock surging since then. Berkshire spent less than $15 billion for a stake in the bank worth over $45 billion today. After Warren Buffett failed to scoop up bargains during the pandemic crash last year, critics accused him of losing a step.