Warren Buffett revealed stakes in Kroger and Biogen, and the news added $2.5 billion to their market values

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· *Warren Buffett's Berkshire Hathaway disclosed stakes in Kroger and Biogen on Friday.*
· *The famed investor spent about $740 million on shares in the supermarket and biopharmaceuticals giants last quarter.*
· *News of the famed investor's backing added $2.5 billion to the pair's combined market cap in after-hours...