Domark Software Ltd. was a subsidiary of Domark Group Limited. It was founded in 1990 as evidenced by that name's appearance on game covers and in credits. Domark Group Ltd began appearing at about the same time, so Domark as a whole may have undergone a restructuring.
In October 1995 the entire Domark conglomerate was acquired by Eidos, along with several other companies. Many of the Domark executives and employees went to work for the new Eidos regime. The Domark name continued to be used until mid-1996 when it was finally changed to Eidos Interactive Limited, and Domark was no more.