Warren Buffett Just Invested $3.9 Billion in 12 Stocks. Here's the Best of the Bunch. Buffett and his team bought 12 stocks in Q2, including initiating three new positions. The best of the bunch appears to be Buffett's biggest purchase in Q2.

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Berkshire Hathaway's $1.6 billion stake in UnitedHealth Group is helping to lift the Dow Jones Industrial Average to a new record as investors pile into healthcare sector funds.