It's options expiration week too, and you see the price driven down to wipe out all the call option holders... Look at the yahoo options page for NSM and you will see what i mean. If there's no shares to borrow for shorting then I suspect the institutional big boys are doing naked short selling or borrowing phantom shares to sell. Fiscal cliff is an excuse to shakeout weak players I.e. retail investors before the correction ends IMHO. This pattern has happened time and time again and I don't see any difference this time.