This excerpt taken from the ATVI DEF 14A filed Jul 30, 2007.
Shares Available Under the 2007 Plan
Subject to adjustment as provided in the 2007 Plan in the event of stock splits, stock dividends, the issuance of rights and certain other events, the number of shares of Common Stock that may be issued or transferred under the 2007 Plan will not exceed 15,000,000 as such number is increased as described under "2007 Plan Appropriately Sized" above. Under the 2007 Plan:
Shares utilized under the 2007 Plan may be newly issued shares, treasury shares or a combination of the foregoing.
In addition to the aggregate limits described in "Highlights of the 2007 Plan," the 2007 Plan contains the following individual annual grant limitations: