Warren Buffett’s Berkshire Hathaway disclosed a new position of roughly 5.04 million shares in UnitedHealth Group, valued at about $1.57 billion at the end of June, according to a second-quarter 13F filing with the U.S. Securities and Exchange Commission. The move marks Berkshire’s first significant bet on the health-insurance giant since it sold an earlier holding in 2010. News of the investment sent UnitedHealth shares up about 8% in post-market trading to near $290. The Dow component had lost 46% of its value this year amid rising medical costs, a U.S. Justice Department billing probe, a major cyberattack and the December 2024 killing of a former top executive. The filing showed broader portfolio shifts at Berkshire. The conglomerate trimmed its Apple stake by 20 million shares, continued selling Bank of America stock, and liquidated its position in T-Mobile US. It also revealed new or larger stakes in steelmaker Nucor, homebuilders DR Horton and Lennar, outdoor-advertising firm Lamar Advertising and security-products provider Allegion. Berkshire’s move into UnitedHealth coincides with buying by other prominent investors. David Tepper’s Appaloosa Management increased its UNH holding by 1,300% to about 2.45 million shares valued at roughly $665 million, while Michael Burry’s Scion Asset Management reported UnitedHealth shares and call options worth about $115 million. The combined interest from high-profile money managers has intensified investor focus on the beleaguered insurer.