The Oracle of Omaha has jettisoned over 427 million shares of Bank of America since July 2024, but has built up Berkshire's position in a business with well-defined competitive edges for four consecutive quarters.In just under two months, Berkshire Hathaway's (BRK.A 0.30%)(BRK.B 0.20%) billionaire CEO Warren Buffett will retire from overseeing day-to-day operations and hand the reins over to Greg Abel. It'll be a bittersweet moment for Wall Street and Berkshire's shareholders given that the Oracle of Omaha ...