This excerpt taken from the MENT 10-Q filed Sep 7, 2007.
1. SHARES SUBJECT TO PLAN.
1.1 Awards granted under this Plan shall be for authorized but unissued or reacquired Common Stock of Mentor Graphics.
1.2 Awards may be granted under the Plan for a total of not more than 1,500,000 shares of Common Stock, subject to adjustment under section 12. Shares subject to options that are terminated or expire without being exercised, other than options that are surrendered upon exercise of a related stock appreciation right, shall be added to the shares remaining for future options.