Okla. Stat. tit. 18 § 381.59
At an annual meeting or at any special meeting of the members or stockholders called to consider such action, any association may convert itself into a federal association pursuant to the laws of the United States, as now or hereafter amended, upon a majority vote of the outstanding stock entitled to vote thereon or upon a majority vote of the total number of votes of the members present in person or by proxy. There shall be filed with the State Banking Commissioner a copy of the charter issued to such federal association by the Director of the Office of Thrift Supervision or a certificate showing the organization of such association as a federal association, certified by the Director of the Office of Thrift Supervision. Upon the grant to any association of a charter by the Director of the Office of Thrift Supervision, the association receiving such charter shall cease to be an association incorporated by this state. Upon conversion of any association into a federal association, such federal association shall be deemed to be a continuation of the entity of the association so converted and all property of the converted association, including its rights, titles, and interests in and to all property of whatever kind, whether real, personal, or mixed, and things in action, and every right, privilege, interest, and asset of any conceivable value or benefit then existing or pertaining to it, or which would inure to it, shall immediately by operation of law and without any conveyance or transfer and without any further act or deed remain and be vested in and continue and be the property of such federal association into which the state association has converted itself, and such federal association shall have, hold and enjoy the same in its own right as fully and to the same extent as the same was possessed, held, and enjoyed by the converting association, and such federal association as of the time of the taking effect of such conversion shall continue to have and succeed to all the rights, obligations and relations of the converting association. All pending actions and other judicial proceedings to which the converting state association is a party shall not be deemed to have abated or to have discontinued by reason of such conversion, but may be prosecuted to final judgment, order, or decree in the same manner as if such conversion into such federal association had not been made and such federal association resulting from such conversion may continue such action in its corporate name as a federal association, and any judgment, order or decree may be rendered for or against it which might have been rendered for or against the converting state association theretofore involved in such judicial proceedings.
Okla. Stat. tit. 18, § 381.59