forgot about your question, perhaps this will help, it's from another stock, but the principle is the same, traded warrants for common stock:
Cashless Exercise: The Holder, at its option, may exercise this Warrant in a cashless exercise transaction pursuant to this subsection (ii) (a “Cashless Exercise”). In order to effect a Cashless Exercise, the Holder shall surrender this Warrant at the principal office of the Company together with an Exercise Form, completed and executed, indicating Holders election to effect a Cashless Exercise, in which event the Company shall issue Holder a number of shares of Common Stock computed using the following formula:
X = Y (A-B)/A
where: X = the number of shares of Common Stock to be issued to Holder.
Y = the number of shares of Common Stock for which this Warrant is being Exercised.
A = the Market Price of one (1) share of Common Stock (for purposes of this Section 3(a)(ii), where “Market Price,” means the Volume Weighted Average Price (as defined herein) of one (1) share of the Company’s Common Stock during the ten (10) consecutive Trading Day period immediately preceding the Date of Exercise.
B = the Exercise Price.
As used herein, the “Volume Weighted Average Price” for any security as of any date means the volume weighted average sale price on The NASDAQ Global Market (“NASDAQ”) as reported by, or based upon data reported by, Bloomberg Financial Markets or an equivalent, reliable reporting service mutually acceptable to and hereafter designated by holders of a majority in interest of the Warrants and the Company (“Bloomberg”) or, if NASDAQ is not the principal trading market for such security, the volume weighted average sale price of such security on the principal securities exchange or trading market where such security is listed or traded
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