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system
why would people sell a stock below the current price?
user
occassionaly a trader will make a blatant mistake. a customer calls to buy 100 shares at $10, and the trader by mistake enters "10 shares at $100". you get one very happy seller :-) in the usa, it doesn't happen often for sales, because if the trader offers to sell 10 shares at $100, there will be nobody accepting the other.  in japan, with one dollar equal to 120 yen, the same mistake would mean that someone wanted to sell 100 shares at 1200 yen, and the trader enters 1200 shares for 100 yen, then you will get a happy buyer, and a massive loss.
assistant