Okla. Stat. tit. 19, § 952.2

All costs and expenses for the selection and compensation of actuarial consultants, investment managers, financial consultants, institutional custodian services, commissions or other costs resulting from the purchase, sale or other transfer of assets, and all costs and expenses related to those services provided in accordance with Section 953.1 of this title shall be paid from the retirement fund except as otherwise provided in Section 956.2 of this title.