Okla. Stat. tit. 36, § 36-2691.15: Tax exemption

Every corporation doing business pursuant to this article is

hereby declared to be a nonprofit, charitable and benevolent

institution and to be exempt from state, county, district, municipal

and school taxes, including the taxes prescribed by the Oklahoma

Insurance Code, excepting only the fees prescribed by Section 321 of

Title 36 of the Oklahoma Statutes, and taxes on real and tangible

personal property situated within this state.