Warren Buffett's favorite holding period is forever, as he often remarks, but it doesn't always work out that way. In reality, the Oracle of Omaha and his team sell stocks regularly, and for a variety of reasons. In fact, of the nine major stock positions in Berkshire Hathaway's (NYSE: BRK-A) (NYSE: BRK-B) portfolio 25 years ago, only three remain today.However, there are right and wrong reasons to sell stocks, and Warren Buffett's past comments, as well as Berkshire's actions, can help guide you in the right direction.Image source: The Motley Fool.Continue reading