[ad_1] Warren Buffett’s Berkshire Hathaway Inc. said it has bought another 9.9 million shares westerners Petroleum Corp, giving it a 17.4% stake in the oil company. Berkshire It paid approximately $582 million for shares purchased between Wednesday and Friday, according to a Friday night filing with the U.S. Securities and Exchange Commission. Buffett’s company is the largest shareholder of Occidental, which now holds 163.4 million shares worth about $9.9 billion. Its stake is roughly 60% higher than that of Vanguard, the next largest shareholder, according to Refinitiv data. Berkshire has…