Okla. Stat. tit. 11 § 24-111
The bonds herein authorized are hereby made securities in which all public officers and bodies of this state and all political subdivisions, all insurance companies and associations, and other persons carrying on an insurance business, all banks, bankers, trust companies, savings banks and savings associations, including savings and loan associations, building and loan associations, investment companies and other persons carrying on a banking business, all administrators, guardians, executors, trustees and other fiduciaries and all other persons whatsoever who are now or may hereafter be authorized to invest in bonds or other obligations of the state may properly and legally invest funds including capital in their control or belonging to them. The bonds are also hereby made securities which may be deposited with and shall be received by all public officers and bodies of this state and all political subdivisions for any purpose for which deposit of bonds or other obligations of this state is now or may hereafter be authorized.
Okla. Stat. tit. 11, § 24-111