| Cadoppi s.r.l. Italy |
| CAPRARI S.p.A. Italy |
| Caprari S.P.A. Italy |
| CAT PUMPS-High Pressure Pumps & Systems United States |
| CATAG AG Switzerland |
| Chair Man Hi-Tech CO., Ltd Taiwan, Province of China |
| Charles Austen Pumps Ltd United Kingdom |
| Chemquip United Kingdom |
| CLYDEUNION United Kingdom |
| COLOSSUS GROUP China |
| CoorsTek United States |
| Crest Process Engineering Ltd United Kingdom |
| Crest Pumps Ltd United Kingdom |
| Cross Manufacturing Company United Kingdom |
| Curtiss-Wright Corp. United States |