Billionaire Warren Buffett's company bought another 3.26 million shares of Burlington Northern Santa Fe Corp. stock, increasing its stake to 67.9 million shares.
Buffett's Berkshire Hathaway Inc. now controls nearly 20 percent of the nation's second-largest railroad. Documents filed with the Securities and Exchange Commission Wednesday show Berkshire completed its latest purchases on Monday and Tuesday.
Berkshire officials don't typically comment on the Omaha company's stock holdings. But previously, Buffett has said railroads have good long-term prospects and are healthier today than in past years.
Berkshire owns insurance, furniture and jewelry companies, utilities and a corporate jet firm, and has major stock investments.