It's been a year of historic change for Berkshire Hathaway (NYSE:BRKA)(NYSE:BRKB) and its shareholders. Longtime CEO Warren Buffett retired at the end of last year, handing the reins to the company's day-to-day operations and its closely followed $362 billion investment portfolio to Greg Abel. But while some things have changed -- Abel dumped 16 of Berkshire's non-core positions in the first quarter -- one core principle has remained the same: portfolio concentration. As of the end of October, seven standout stocks accounted for nearly 71% ($255.2 billion) of Berkshire's portfolio: Several of Warren Buffett's legacy holdings remain pillars of Berkshire Hathaway's portfolio. Image source: Getty Images.
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