Proxy Statement release today may be the reason for the stock price move:
This looks like an ammendment to stock options in the event of a company takeover.
Automatic Vesting Upon a Change in Control
The Existing Plan provides that the Plan Administrator may, but is not required to, provide for the full or partial automatic vesting and exercisability of one or more outstanding unvested awards under the Existing Plan and the release from restrictions on transfer and repurchase or forfeiture rights of such awards in connection with a corporate transaction or change in control. In addition, the Plan Administrator may, but is not required to, condition any such award vesting and exercisability or release from such limitations upon the subsequent termination of the continuous service of the grantee within a specified period following the effective date of the corporate transaction or change in control, and may provide that any awards so vested or released from such limitations in connection with a change in control shall remain fully exercisable until the expiration or sooner termination of the award.
The Amended Plan would provide for the automatic vesting and exercisability, and the lapsing of all other conditions applicable to vesting and exercisability, of all unvested of all awards under the Amended Plan upon a change in control of the Company, with no action required on the part of the Plan Administrator. Any performance criteria relevant to such awards shall be deemed to have been achieved at the target performance level. The Plan Administrator may provide that awards that remain outstanding after vesting will be assumed or replaced in connection with the change in control. The Plan Administrator may also provide for the cashing out of outstanding and vested options and stock appreciation rights based on the based upon the per-share consideration being paid in connection with such change in control, less the applicable exercise price or base amount. The Amended Plan also modifies the definitions of “Change in Control” and “Corporate Transactions.”
