Can't figure out National BankOver the last month net change in position for National Bank is -25,659,480. According to stockwatch there are only 14,402,500 shares of HOU. I know ETFs are different than other stocks but I can't say I understand the trading. Every day for as long as I can remember they are the biggest seller. Is it possible to short more shares than exist? or is the 14 million number on stockwatch out of whack?