Berkshire’s Big Bet on UnitedHealth Berkshire Hathaway’s (NYSE:BRK-A)(NYSE:BRK-B) release yesterday of its latest 13F filing sent ripples through the market as it revealed a new 5 million share stake in UnitedHealth Group (NYSE:UNH) worth approximately $1.

The Oracle of Omaha just took a $1.6 billion stake in the battered healthcare giant, sending shares soaring 9% after hours.

Warren Buffett's Berkshire Hathaway has acquired 5 million shares in UnitedHealth Group , a regulatory filing showed on Thursday, sending the health insurer's stock up 7% in extended trading.