there's a lockup period, nobody is selling their pre-IPO shares now.
Everything outside of that is subject to lockout periods (and in the case of executives they are also vesting on new stock)
Morgan Stanley & Co. Incorporated may, in its sole discretion, release all or some portion of the shares subject to lock-up agreements prior to expiration of the lock-up period.
Related poll: http://www.wepolls.com/r/462580/Is-it-right-for-Wall-Street-...