Seven studios helped develop Call of Duty: Modern Warfare 3 - Xfire

According to the game's Steam page, Sledgehammer Games, Treyarch, Infinity Ward, and four other studios helped with the upcoming installment.

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Modern Warfare 3 has a worrying amount of studios working on CoD 2023

Call Of Duty: Modern Warfare 3 Was An Immense Seven Studio Effort - Gameranx

CrossfireX is a Throwback for Fans of Modern Warfare

Call of Duty: Modern Warfare 3 – Seven Studios Involved in Development

New Report Reveals that Modern Warfare 3 Development Time Was Half That of a Normal Call of Duty - IGN

Call of Duty: Modern Warfare III

Crossfire (TV Mini Series 2022) - News - IMDb

Source] mw3-surviv0r - Cheat for survival mode (Steam version)

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Modern Warfare 3' boss says rushed development reports are “inaccurate”