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OMAHA — Billionaire Warren Buffett’s company bought a nearly $60 million stake in Exxon Mobil Corp., trimmed holdings in oil rival ConocoPhillips and nearly doubled its stake in Wal-Mart Stores Inc. during the latest quarter.
Omaha-based Berkshire Hathaway Inc. disclosed the changes to its $59.7 billion U.S. stock portfolio in a Securities and Exchange Commission filing Monday.



