With the latest buy, Berkshire has about 255.3 million shares in Occidental Petroleum, bringing Berkshire's stake to 28.8%. Occidental Petroleum is Berkshire's sixthlargest holding. pourounnummennummunummunummunummunummunummunummunumman was and the world on the world of the world of the world of the world TradingView Warren Buffett's Berkshire Hathaway has boosted its stake in Occidental Petroleum to almost 29%. Berkshire bought Occidental Petroleum shares every trading day from June 5 to June 17, adding a ...