That might explain why the Bill & Melinda Gates Foundation has Berkshire as its second biggest holding, behind only Microsoft. As of the latest reporting period, the foundation owns 24.6 million shares of Berkshire worth around $10 billion, making up 21% of its total portfolio.

Domino’s is the only sizable new equity holding by Berkshire in the period. Domino’s shares are rising in after-market activity in an apparent reaction to the Berkshire news.

Shares of Domino's Pizza jumped premarket after Warren Buffett’s Berkshire Hathaway disclosed a new position in the chain. The investment conglomerate also took a stake in Pool Corp., and cut its position in Ulta Beauty.