The long-running mystery around Warren Buffett’s latest stealth investment is finally over. In Berkshire Hathaway’s (NYSE: BRK.B) newest 13F filing, the Oracle of Omaha revealed a fresh stake in UnitedHealth Group Incorporated (NYSE: UNH).

Berkshire Hathaway invests $1.57B in UnitedHealth (UNH), boosting shares by 10.5%. Discover key insights on its challenges, outlook, and analyst ratings.

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.

Warren Buffett's Berkshire Hathaway built a $1.6 billion stake in UnitedHealth last quarter, marking one of its last wagers with the investor as CEO.

Warren Buffett's mystery stock purchase has sparked speculation and a frenzy. The only certain clue is that it's not a bank, insurer, or consumer products company.

The conglomerate sold Apple shares during the second quarter, though the iPhone maker remains Berkshire’s largest stockholding.

B stake in UnitedHealth Group Incorporated signals a market shift. Click for why I have now upgraded UNH stock to Buy.

Futures for the Dow Jones Industrial Average and other major stock indexes traded sharply mixed Friday as Wall Street reacted to the U.S. retail sales report. Meanwhile, UnitedHealth GroupUNH soared on the stock market today after famed investor Warren Buffett disclosed a new position.