When legendary investor Warren Buffett is exceptionally bullish about a market opportunity, Wall Street listens. That’s why the spotlight is currently on hydrocarbon exploration and production specialist Occidental Petroleum (NYSE:OXY). Buffett’s industrial conglomerate Berkshire Hathaway (NYSE:BRK-A, NYSE:BRK-B) has been aggressively scooping up OXY stock ahead of potentially favorable oil market dynamics.According to CNBC, regulatory filings show that Berkshire “purchased Occidental shares every trading d ...