Billionaire investor Warren Buffett's Berkshire Hathaway Inc. boosted its stake in Burlington Northern Santa Fe Corp., the second-largest U.S. railroad, by 24 percent.
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Berkshire bought 10.1 million more shares of the carrier based in Fort Worth, Texas, from Aug. 23 through today, it said in a regulatory filing. It was already the biggest shareholder in the company based in Omaha, Neb.