Warren Buffett's Berkshire Hathaway has added a new stake in NRG Energy, according to a just-released portfolio 'snapshot' of its holdings in U.S. publicly-traded stocks as of June 30. A sharply reduced stake in Anheuser-Busch may have been a bet that InBev's initially unsolicited offer for the U.S. brewer would prove to be unsuccessful. Conoco-Phillips data is kept "confidential."
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