Warren Buffett's Successor, Greg Abel, Has 82% of Berkshire's $360 Billion Portfolio Concentrated in 10 Superstar Stocks

It's officially the beginning of a new era for one of Wall Street's most prized public companies. Warren Buffett's Dec. 31 retirement as CEO of Berkshire Hathaway (NYSE:BRKA)(NYSE:BRKB) paved the way for his protégé, Greg Abel, to take the reins. Although Buffett remains chair of Berkshire's board, it's Abel now overseeing the company's day-to-day operations and its $360 billion investment portfolio. Abel was quick to make his mark, with Berkshire's new boss jettisoning 16 positions from the portfolio in the first quarter. Missed Nvidia in 2009? This Rare Signal Is Flashing Again. In 2009, a "Double Down" signal flashed for a little-known chipmaker called Nvidia.