Warren Buffett is helping revive shares of beleaguered UnitedHealthcare Group after taking a $1.6 billion stake in the company, according to filings with the Securities and Exchange Commission.UnitedHealth shares clocked the largest one-day percent increase since March 2020, as tracked by Dow Jones Market Data Group. For the week, shares rose over 21%, the best week since May 2009. Still, the stock is down more than 50% over the past 12 months. Investors, taking a cue from Buffett’s interest in healthcare, also piled into Vanguard Health Care Index Fund ETF Shares and The Health Care Select Se...

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