Buffett owns more than 10% of Occidental's stock, and with no end in sight to higher oil and gas prices amid rampant inflation, the energy sector has been on fire. Now what Berkshire Hathaway now owns more than 136 million shares of Occidental Petroleum, which after today's jump in price now values those holdings at some $8.4 billion. After all, the newsletter they have run for over a decade, Motley Fool Stock Advisor, has tripled the market.