Since Warren Buffett has added Todd Combs and Ted Weschler as investment officers to co-manage Berkshire's massive stock portfolio, investors don't typically know for sure who makes the final decision on any one stock purchase or sale. But the Domino's addition has some of the markings of a Buffett-led purchase.

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.