Okla. Stat. tit. 36, § 613.1

Any insurance company transacting the business of property and casualty insurance in this state shall not be issued a new or renewal certificate of approval unless the company has provided a corporate surety bond or approved alternative security arrangement in an amount determined by the State Insurance Commissioner to be sufficient to provide for the return of unearned premiums if a policy is canceled during the term thereof by an insurance company. The State Insurance Commissioner shall promulgate rules and regulations to implement and carry out the provisions of this section.