The Sumpal was soon assimilated into the Royal Dutch, and the Muara Enim Co. and the Musi Ilir Co. were also assimilated into the Royal Dutch, in 1904 and in 1906, respectively.
Sumpal segera melebur ke dalam Royal Dutch, dan Muara Enim Co dan Musi Ilir Co juga melebur ke dalam Royal Dutch, masing-masing pada tahun 1904 dan 1906.