I worked at a company that was traded public on the NASD. The stock was sitting at 7 5/8. One day, at work, the board members were having a meeting in the "big room" when the president flew out of the meeting and slammed the door. Everyone on the floor heard it. 30 minutes later, the stock was down to 3 3/8. As it turned out, the president, the single largest share holder, was ganged up on somehow during the meeting. When he flew out of the room to his office, he called his broker and order him to dump every single share he owned on the open market as a form of revenge. It turns out his shares were made available to trade to the public a few days before that. The good news was that the stock recovered shortly thereafter but you should of seen the calls that came in. The bad news was that the president was out of work.