The Omaha, Nebraska-based conglomerate purchased Occidental shares every trading day from June 5 to Monday, totaling an additional 7.3 million shares with purchase prices slightly under or above $60, filings showed. 'Read every word' Warren Buffett's Berkshire Hathaway has scooped up more shares of Occidental Petroleum over each of the past nine trading sessions, driving his gigantic stake in the Houston-based oil and gas producer to almost 29%, according to regulatory filings. Berkshire also owns $10 billi ...