(Reuters) – Warren Buffett’s Berkshire Hathaway bought around 2.57 million shares of common stock in Occidental Petroleum over June 5-7, according to a U.S. securities filing. Buffett’s company bought additional shares in Occidental’s common stock for more than $150 million and now owns about 250.6 million shares in the energy producer. Occidental shares closed at $59.48 … Read more