Okla. Stat. tit. 14A, § 3-313
Not later than thirty (30) days after the date on which a residential mortgage loan is sold or otherwise transferred or assigned to a third party, the creditor that is the new owner or assignee of the debt shall notify the borrower in writing of such transfer, including:
Laws 2012, HB 2742, c. 172, § 8, emerg. eff. July 1, 2012.