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UnitedHealth shares surged Friday after Warren Buffett’s Berkshire Hathaway revealed a stake in the embattled healthcare giant. Monitor these major chart levels.

Buffett owned UnitedHealth shares before selling his stake in 2010, though his Berkshire Hathaway recently acquired shares.

Leveraged positions in the stock market jumped 18% in one month and topped $1 trillion for the first time. Increasing use of debt to invest can tell us a lot about investors' attitudes. And while this has always been the case,

However, Apple is not the only big position that Buffett has been reducing. He also continues to sell down his stake in Bank of America . Buffett sold about 4% of his remaining Ba

Warren Buffett has authorized $77.8 billion worth of stock buybacks since 2018, double the amount he has ever invested in any other stock. While Berkshire's buyback program remains active, Buffett hasn't pulled the trigger in any of the past four quarters.