Not as such. As an example, Steve Jobs ownes 7% the shared of Disney. If tomorrow, he were to sell them all, no matter what the price, there might not be enough people to buy them all, so people who, for the laugh, said they'd buy Disney stock at $0.01 a share would eventually get the shares. Thus the stock price for Disney would drop to $0.01. A similar thing just happened to BitCoin, but rather than shares of Disney being traded, it was bitcoins.
