Institution
- Continental Aviation1
- Continental Oil Company1
- Cook College1
- Cooper Engineering Company1
- Cosden Oil Company1
- Council for a Livable World1
- Council on Competitiveness (U.S.)1
- Council on Environmental Quality (U.S.)1
- Covington & Burling1
- Crompton & Knowles Corporation1
- Cryopharm Inc.1
- Cuadra Associates1
- Cudahy Packing Company1
- Curie Foundation1
- Curtis Institute of Music1
- Cytotherapeutics1
- České vysoké učení technické v Praze1
- DAS Group, Inc.1
- DDI Corporation1
- DDI Pocket Telephone Inc.1