Well, KCG did jump 60 percent the next day. Then it fell back 25 percent from there and has been dead every since. I bought and sold quickly.
One thing I have learned about individual stocks. When something goes wrong it usually affects the stock for A LONG TIME TO COME. So never hold onto these. And this is also the reason to not buy low PE stocks. If they are low, then they are low for a reason. And my reason is wall-street does not like it. So always go fine something else to buy or do what I do. Never buy until a disastor strikes. I love disastors. :) It is called when good companies go on sale. :)