Berkshire bought 1.28 million shares of the global pizza delivery chain, which were valued at $550 million at the end of the third quarter. And he added more than 400,000 shares of the wholesale distributor of pool equipment. Shares of both companies jumped on news of Buffett's investments.

Berkshire Hathaway initiated these new positions during the third quarter even as it cut back its holdings of big names like Apple and Bank of America.

Warren Buffett's Berkshire Hathaway took stakes in Domino's Pizza and swimming pool supplier Pool Corp. in the third quarter while continuing to trim stakes in longtime holdings Apple and Bank of America.