
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 ended Q2 holding five million shares, valued at about $1.6 billion, a position it likely began building quietly in the prior quarter after requesting permission from regulators to accumulate shares without triggering a rush of buying.
The news sent UnitedHealth shares soaring more than 10% in after-hours trading on Thursday. While the choice might seem unexpected given the company’s battered reputation in 2025, it fits perfectly into Buffett’s playbook.