
Warren Buffett's Berkshire Hathaway is going heavy on oil and gas exploration and production company Occidental Petroleum (NYSE: OXY), having bought 7.26 million shares of the company at prices hovering around $60 since June 5, according to the Omaha-based company's latest Form 4 filings with the US Securities and Exchange Commission.
Buffett now holds 255.28 million company stocks worth $15.28 billion, making Occidental Petroleum the six-largest stock holding in his over $300 billion portfolio with a 4.62% exposure.