Berkshire bought 1,277,256 shares of the global pizza delivery chain, which were worth $550 million at the end of the quarter. Domino's shares soared on the news after hours on Thursday, which is typical when Buffett's company buys a new stock. Domino's finished the after-hours session up 7.8%.

Warren Buffett is stockpiling cash. His Berkshire Hathaway holding company continued to sell more than it bought in the third quarter when it offloaded a quarter of its stake in Apple, regulatory filings revealed Thursday.