Politics and Business magazines
- Columbia/HCA Healthcare Corporation
- Columbus McKinnon Corporation
- Comair Holdings Inc.
- Comair Holdings, Inc.
- Combe Inc.
- Comdial Corporation
- Comdisco, Inc.
- Comerica Incorporated
- COMFORCE Corporation
- Cominco Ltd.
- Command Security Corporation
- Commerce Clearing House, Inc.
- Commercial Credit Company
- Commercial Financial Services, Inc.
- Commercial Union plc
- Commercial Vehicle Group, Inc.
- Commodore International Ltd.
- Commonwealth Edison Company
- Commonwealth Energy System
- Commonwealth Telephone Enterprises, Inc.