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| Name | Business Type(s) | Company Type(s) | Country of Office | Status |
| Underground Development | [[Subsidiary of Activision]] | |||
| Unigine Corp | ||||
| United Front Games | dev | |||
| Universomo | [[Private (subsidiary of THQ)]] | |||
| Unknown Worlds Entertainment | ||||
| Unterhaltungssoftware Selbstkontrolle | Content Rating |
| ||||||||