Okla. Stat. tit. 18, § 381.29

At any meeting of the members or stockholders of an association or federal association voting may be in person or by proxy appointing a person or group to cast the votes of the member or stockholder, provided that no proxy shall be eligible to be voted at any meeting unless such proxy shall have been filed with the association at least five (5) days prior to the date of the meeting. Unless otherwise specified in the proxy, every proxy shall continue in force from year to year until revoked by a writing duly delivered to the secretary or until superseded by a subsequent proxy. Laws 1970, c. 101, § 29, eff. June 1, 1970; Laws 1978, c. 168, § 7, eff. July 1, 1979.