Berkshire Hathaway's Class A shares have appreciated 3,999,494% since Warren Buffett took over the company in 1965.

Berkshire also added to new buy-ins from the third quarter, namely Domino's Pizza and Pool. Three longer-term holdings that also saw boosts were satellite broadcaster SiriusXM Holdings, energy sector mainstay Occidental Petroleum, and electronic document management company Verisign.

In his 60th annual letter to shareholders released Saturday, the folksy Buffett bragged about footing a record $26.8 billion tax bill.