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UnitedHealth Group shares soared Friday after legendary investor Warren Buffett revealed a significant stake in the troubled insurer.

The health-care stock ended the day up 12%, its best daily performance since March 2020. UnitedHealth, often viewed as an industry bellwether, also helped lift the Dow Jones Industrial Average to an all-tim intraday high on Friday.

The advance came after Buffett 's conglomerate Berkshire Hathaway revealed a stake of 5 million shares , worth about $1.6 billion, in a filing with the Securities and Exchange Commission. The "Big Short" investor Michael Burry and Appaloosa Management's David Tepper also disclosed sizable stakes in the company, i

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