Okla. Stat. tit. 36, § 36-2617: Tax exemption

Every corporation doing business pursuant to this article is

hereby declared to be a not-for-profit institution and to be exempt

from state, county, district, municipal and school tax, including

the taxes prescribed by this Code, and excepting only the fees

prescribed by Article 3 of the Insurance Code (Insurance Department

and Insurance Commissioner), the premium tax levied pursuant to

Article 6 of the Insurance Code (Authorization of Insurers and

General Requirements), and taxes on real and tangible personal

property situate within this state.