Warren Buffett is one of the most widely respected investors in the world. And there's a good reason. With nearly 70 years investing in the public eye, he's produced incredible returns for anyone willing to invest alongside him.

Warren Buffett has sold Bank of America for 12 straight days, for the third time in less than three months, but the prices he sold the stock shows that’s not a coincidence.

A dozen rounds of selling have trimmed Warren Buffett’s stake in Bank of America Corp. to the cusp of a key regulatory threshold, in which he will no longer need to quickly notify the public of his trading.