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."   Read More

What's Buffett buying? The answer appears to be 'not much' in the first quarter of this year, although his stakes in two healthcare companies and Kraft Foods did increase somewhat. Berkshire Hathaway's just-released disclosure of its U.S. stock portfolio holdings as of March 31 does not include any new names.    Read More