For a corporation incorporated on or after October 1, 1995, unless the charter expressly grants such rights to the stockholder, a stockholder does not have any preemptive right to subscribe to: Any additional issue of stock; or Any security convertible into an additional issue of stock. For a corporation incorporated before October 1, 1995, a stockholder shall have preemptive rights as and to the extent in existence before October 1, 1995, unless and until expressly changed or terminated by charter amendment. A stockholder to whom a preemptive right has been granted may waive the preemptive right. A written waiver of a preemptive right is irrevocable even though it is not supported by consideration.