Okla. Stat. tit. 85A, § 41

A. Every employer who has secured compensation under the provisions of this act shall keep posted in a conspicuous place in and about the employer's place of business typewritten or printed notices in accordance with a form prescribed by the Commission. The notices shall state that the employer has secured the payment of compensation in accordance with the provisions of this act. B. The notices shall contain the name and address of the carrier, if any, with whom the employer has secured payment of compensation and the date of the expiration of the policy.