With help from $10 billion of funding from Berkshire Hathaway ( BRK.B ) CEO Warren Buffett, Occidental Petroleum ( OXY, $45.06) acquired Anadarko Petroleum. It essentially yanked the company away from Chevron ( CVX ), which had bid $33 billion – an offer Anadarko accepted, but then reconsidered after Occidental stepped in. The cash-and-stock transaction was valued at $55 billion, including the assumption of Anadarko's debt. The deal terms: $59 per share in cash and 0.2934 OXY shares for every Anadarko share.