Julie Bang / Investopedia The 95-year-old Warren Buffett is stepping down as Berkshire Hathaway's CEO at the end of the year. KEY TAKEAWAYS Berkshire Hathaway has struck a $9.7 billion all-cash deal to buy OxyChem, the petrochemical division of Occidental Petroleum, in the largest acquisition by Warren Buffett’s conglomerate since 2022. Berkshire Hathaway has been focused on selling stakes and growing its cash pile rather than big-ticket purchases in recent years. Berkshire Hathaway (BRK.A, BRK.B) h ...