Okla. Stat. tit. 36, § 612.2

After November 1, 1987, no insurer who requests to write workers' compensation insurance in this state shall be permitted to transact the business of workers' compensation insurance in this state unless the insurer possesses and maintains a surplus as regards policyholders, as defined in Section 610 of Title 36 of the Oklahoma Statutes, in excess of Five Million Dollars ($5,000,000.00). Should the surplus as regards policyholders fall below Five Million Dollars ($5,000,000.00), the insurer shall not be permitted to write any additional workers' compensation insurance until the surplus meets the statutory requirements as established in this section.