From Motley Fool:
Warren Buffett loves buying great stocks at fair prices, but he doesn’t hold onto every stock he buys forever. Sometimes, he’ll sell stocks after he’s made a healthy profit. Other times, he’ll sell because something has changed to make the company less attractive to him.
Knowing what stocks Buffett’s selling can be important because his investment company, Berkshire Hathaway, is so big that when he sells, it can cause share prices to drop. That’s a risk investors might not want to take!