Jan 10, 2008 Warren Buffett's Berkshire Hathaway Inc. bought 29,600 more shares of Burlington Northern Santa Fe stock, giving Berkshire ownership of 17.4 percent of the nation's second-largest railroad. Buffett's company now owns 60.9 million shares of Burlington Northern Santa Fe Inc., which is based in Fort Worth, Texas. Its shares rose $2.21, or 2.8 percent, to $80.06 Thursday. Read More..