Warren Buffett has proven to be one of the best investors ever. Since taking over as chief executive officer of Berkshire Hathaway in 1965, Buffett has delivered returns of 20% compounded annually. Put differently, if you had invested $1,000 in the company when Buffett took over, that investment would be worth $3,787,564 at the end of last year! 

This track record of long-term success is why investors eagerly await Berkshire Hathaway's quarterly form 13-F. The Securities and Exchange Commission requires institutional investors to file a form 13-F, which discloses their quarterly securities trading activity.

Berkshire Hathaway completely closed out of three of its holdings in the second quarter, and one stock in that group was Marsh McLennan (NYSE: MMC). Berkshire first bought the insurance broker in the fourth quarter of 2020. Here we'll explore why Buffett sold and whether investors should follow his lead.

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Source Fool.com