do they have any other companies under them?
No, however some employees left Insomniac Games to form High Impact Games
Insomniac Games
The company has a close relationship with video game developer Naughty Dog and they often share technology with each other. Some employees left Insomniac Games to form High Impact Games, which later collaborated with Insomniac on "Ratchet & Clank" projects and "". Nathan Fouts, an ex-Insomniac employee, founded his own studio and developed "Weapon of Choice". "HuniePop" was designed by Ryan Koons, who used to be an employee of Insomniac.
when does marvel's spiderman game come out September 7, 2018 can you mention any character from it? Spider man,  Peter Parker, Mary Jane Watson who developed the game? Insomniac Games where is the plot set? New York how was this game received? Generally favorable reviews; It  received praise for its gameplay, graphics, narrative, and characterization, but was criticized for its familiar open-world tropes and lack of innovation. where is the game development company located? Burbank, California. when was it founded? 1994 can you name any founding members? Ted Price what project did this company work on from 1996 to 2000? Spyro the Dragon was there another game which used the same character as the one you just mentioned? Yes  - The Legend of Spyro and Skylanders any other game that they have released? Yes - Ratchet & Clank on what philosophical ground does this company work? Developers are given creative freedom,    the team solves problems together, trust, honest communications between staff members, admitting mistakes can help maximize creativity, company's leaders should be approachable by staff members.
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Insomniac Games [SEP] Related companies
The company has a close relationship with video game developer Naughty Dog and they often share technology with each other. Some employees left Insomniac Games to form High Impact Games, which later collaborated with Insomniac on "Ratchet & Clank" projects and "". Nathan Fouts, an ex-Insomniac employee, founded his own studio and developed "Weapon of Choice". "HuniePop" was designed by Ryan Koons, who used to be an employee of Insomniac.