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Sphere, Inc. was an American video game developer formed from the 1987 acquisition and merger of Nexa Corporation and Spectrum HoloByte by British print publisher Pergamon Press. The company would later regain its independence in September 1992, renaming itself back to Spectrum HoloByte (and with Nexa Corporation remaining permanently merged.)
- Main article: Spectrum HoloByte.
In early 1987, Nexa Corporation and Spectrum HoloByte were acquired by British print publisher Pergamon Press and merged into a new company, Sphere, with its games generally still marketed under the Spectrum HoloByte name.
After the death of Pergamon Press founder Robert Maxwell in November 1991, the publisher's subsidiaries encountered significant financial difficulties in the inter-business conflicts and infighting that followed. Regardless, Nexa Corporation founder Gilman Louie was able to keep Sphere in business, and in September 1992 established the company as an independent entity; in the process, the company was renamed back to Spectrum HoloByte.