Okla. Stat. tit. 40, § 3-121
If a Professional Employer Organization, or PEO, chooses the option to file quarterly tax returns under the account assigned to its client pursuant to paragraph 2 of subsection A of Section 3-120 of Title 40 of the Oklahoma Statutes, and if the client has an experience history from a previous account assigned to that client that can be used in calculating an earned tax rate pursuant to the provisions of Article 3, Part 1, of the Employment Security Act of 1980, then that experience history shall be transferred to the account assigned to that client as a co-employer of that PEO.
Laws 2016, HB 2253, c. 287, § 12, eff. November 1, 2016.