Warren Buffett's Berkshire Hathaway just revealed positions in Kroger, a biotech and these others

Warren Buffett, chairman and CEO of Berkshire Hathaway Inc
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Warren Buffett's Berkshire Hathaway revealed it owned 18.9 million shares of Kroger at the end of the fourth quarter, sending shares of the grocery story surging in after-hours trading. Here's what else the Oracle of Omaha is betting on:

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