Okla. Stat. tit. 18, § 1042

ISSUANCE OF ADDITIONAL STOCK; WHEN AND BY WHOM The directors, at any time and from time to time, if all of the shares of capital stock which the corporation is authorized by its certificate of incorporation to issue have not been issued, subscribed for, or otherwise committed to be issued, may issue or take subscriptions for additional shares of its capital stock up to the amount authorized in its certificate of incorporation.