Warren Buffett’s Berkshire Hathaway recently invested $610 million in Occidental Petroleum (OXY), Sirius XM (SIRI), and VeriSign (VRSN). While each stock has potential, Occidental Petroleum stands out as the best pick due to Buffett’s massive stake and the stock’s undervaluation. Learn why Buffett is bullish on these stocks and which one might be the best investment for you!