Buffett Just Tightened His Grip on Occidental. That’s Not a Coincidence. When Warren Buffett keeps buying the same stock—year after year—you don’t ignore it. You pay attention. And right now, he’s practically wrapping Berkshire Hathaway around Occidental Petroleum. As of early 2025, Berkshire owns roughly 28% of OXY’s common stock—about 264.9 million shares. Factor in…