Buffett's Berkshire Hathaway Increases Stake in Occidental Petroleum.

Berkshire Hathaway, the company owned by billionaire Warren Buffett, has purchased over $200 million worth of Occidental Petroleum's shares in the past week, giving it control of 23.6% of the oil producer's stock. Berkshire now owns nearly $13 billion worth of Occidental's common shares outright, as well as $10 billion worth of preferred Occidental shares and warrants to buy another 83.9 million shares. Buffett has not commented on how many shares he might be interested in buying, and did not address the investment in his annual letter to shareholders last month.