The clan moved its seat from Shimōsa to Mutsu Province in the early Kamakura period, and were confirmed as daimyō of Sōma Nakamura Domain under the Edo-period Tokugawa shogunate.

He accompanied Yoritomo in the conquest of the Hiraizumi Fujiwara in 1189, and was awarded with estates covering three districts in southern Mutsu: Namekata, Shineha, and Uda.

During the Nanboku-chō period following the fall of the Kamakura shogunate and successive tumult, the Sōma were one of the few clans in Mutsu to remain loyal to the Northern Court.

[2] At the time of the Battle of Sekigahara, the Sōma attempted to remain neutral for fear of the powerful Satake clan to the south, which was allied with Ishida Mitsunari through marriage ties.

The subsequent history of the domain was largely uneventful, and the Sōma clan retained its holdings for the entirety of the Edo period, surviving until the Meiji Restoration.

The Sōma clan hired the famous lawyer Hoshi Tōru to defend their case, which went on for years, as the legal definition of insanity and the qualifications necessary for a doctor to declare a person mentally incompetent were not yet defined in Japanese jurisprudence.

His son, Marquis Sōma Taketane (1889–1936) served in the Imperial Household Ministry and accompanied Prince Yasuhiko Asaka to France, where he became fascinated with golf.