Warren Buffett purchases $4.5B stake in Houston energy co. By: Houston Business Journal via Business Journals August 31, 2015 at 08:56 AM EDT Warren Buffett's Berkshire Hathaway Inc. (NYSE: BRK) disclosed a more than 10 percent stake in Houston-based Phillips 66 (NYSE: PSX) on Aug... Read More >> Related Stocks: iPath Dow Jones-Goldman Sachs Crude Oil Fund