Warren Buffett's Successor, Greg Abel, Has Over $42 Billion of Berkshire Hathaway's Capital Invested in 3 Virtual Monopolies

Key Points Warren Buffett retired as Berkshire’s CEO on Dec. 31, handing the keys to the company’s $358 billion investment portfolio to Greg Abel. As of Sept. 25, more than $42 billion of Berkshire’s invested capital could be traced to a trio of companies with virtual or legal monopolies. All three companies possess well-defined competitive advantages that can boost their margins and generate predictable operating cash flow. 10 stocks we like better than Alphabet › It's been a year of historic change for shareholders of Berkshire Hathaway (NYSE:BRKA) (NYSE:BRKB) . On Dec.