Okla. Stat. tit. 36, § 36-1614: Corporate obligations

A. An insurer may invest in bonds, debentures, notes and other

evidences of indebtedness issued, assumed or guaranteed by any

solvent institutions created or existing under the laws of the

United States or of any state, district or territory thereof, which

are not in default as to principal or interest.

B. An insurer may invest in fixed interest bearing obligations,

other than those described in subsection A of this section, of such

institutions if not in default.