Except the employer may be the withholder:
http://www.sec.gov/Archives/edgar/data/1318605/000119312510068933/dex103a.htm
"7. EXERCISE...
(b) By exercising your option you agree that, as a condition to any exercise of your option, the Company may require you to enter into an arrangement providing for the payment by you to the Company of any tax withholding obligation of the Company arising by reason of (1) the exercise of your option, (2) the lapse of any substantial risk of forfeiture to which the shares of Common Stock are subject at the time of exercise, or (3) the disposition of shares of Common Stock acquired upon such exercise....
10. WITHHOLDING OBLIGATIONS.
(a) At the time you exercise your option, in whole or in part, or at any time thereafter as requested by the Company, you hereby authorize withholding from payroll and any other amounts payable to you, and otherwise agree to make adequate provision for (including by means of a cashless or broker-assisted exercise), any sums required to satisfy the federal, state, local and foreign tax withholding obligations of the Company or an Affiliate, if any, which arise in connection with your option.
(b) Upon your request and subject to compliance with any applicable conditions or restrictions of law, the Company may withhold from fully vested shares of Common Stock otherwise issuable to you upon the exercise of your option a number of whole shares of Common Stock having a Fair Market Value, determined by the Company as of the date of exercise, not in excess of the minimum amount of tax required to be withheld by law. If the date of determination of any tax withholding obligation is deferred to a date later than the date of exercise of your option, share withholding pursuant to the preceding sentence shall not be permitted unless you make a proper and timely election under Section 83(b) of the Code, covering the aggregate number of shares of Common Stock acquired upon such exercise with respect to which such determination is otherwise deferred, to accelerate the determination of such tax withholding obligation to the date of exercise of your option. Notwithstanding the filing of such election, shares of Common Stock shall be withheld solely from fully vested shares of Common Stock determined as of the date of exercise of your option that are otherwise issuable to you upon such exercise. Any adverse consequences to you arising in connection with such share withholding procedure shall be your sole responsibility...
14. ISO EXERCISE LIMITATION.
(a) If your option is an incentive stock option, the aggregate Fair Market Value of the shares of Common Stock with respect to which you may exercise your option for the first time during any calendar year, when added to the aggregate Fair Market Value of the shares of Common Stock subject to any other options designated as Incentive Stock Options and granted to you under any stock option plan of the Company or an Affiliate prior to the Date of Grant with respect to which such options are exercisable for the first time during the same calendar year, shall not exceed $100,000 (the “ISO Exercise Limitation”) unless applicable law requires that your option be exercisable sooner.1
(b) Notwithstanding the provisions of paragraph 4(a), if the ISO Exercise Limitation would prevent you from exercising your option as to vested shares, then the ISO
Exercise Limitation shall terminate as to such vested shares as such shares vest, and you may exercise your option as to such vested shares. Upon such termination of the ISO Exercise Limitation, your option shall be deemed a Nonstatutory Stock Option to the extent of the number of vested shares of Common Stock subject to your option that would otherwise exceed the ISO Exercise Limitation."
When Elon exercises the remainder of the 2009 grant, there might be a temporary $450 million increase in the cash balance depending on the proximity to quarter-end.
Mods: Apologies if the above is too much in the weeds for ST Price discussion. Delete/move as you wish