The main office was later moved to Ponca City, Oklahoma, when in 1929, Marland Oil Company (founded by exploration pioneer E. W. Marland) acquired the Continental Oil Company.
Kantor pusatnya kemudian pindah ke Ponca City, Oklahoma, ketika pada tahun 1929, Marland Oil Company (didirikan oleh E. W. Marland) mengambil alih Continental Oil Company.