(Reuters) – Warren Buffett’s Berkshire Hathaway (NYSE:) bought about 2.57 million shares of Occidental Petroleum (NYSE:) common stock during June 5-7, according to a U.S. securities filing.
Buffett’s company bought additional shares of Occidental common stock for more than $150 million and now owns about 250.6 million shares of the energy producer.
Occidental shares closed at $59.48 on Friday.
As of March, Berkshire owned about 28% of Occidental.
Occidental Petroleum previously announced it had entered into a joint venture with Berkshire Hathaway’s energy unit to mine lithium from a geothermal facility in California.