Okla. Stat. tit. 36, § 2420

If such mutual benefit association be converted into a stock legal reserve life insurance company each and every policyholder or certificate holder shall have the exclusive right for thirty (30) days after the conversion is approved at the policyholders' meeting and the mailing of the notice thereof to purchase that proportion of the total stock offered for sale as the amount of his insurance bears to the association's total insurance in force at the time of conversion. Any stock not purchased by the policyholders may then be sold by the board of directors. Laws 1957, p. 323, § 2420.