| 1 | HCH | Hellis Avia Charter | Callsign: Hellisavia, | MD | AVCODES |
| 2 | HCH | Helicopteros del Caribe, C.A. (HELICA) | Callsign: Helica, | YV | AVCODES |
| 3 | HCHK | HAPCHUK INC | | | SCAC4 |
| 4 | HCHS | HIRSCHFELD STEEL CO INC | | | SCAC4 |
| 5 | HCHT | HUACHUCA TRANSFER CO | | | SCAC4 |
| 6 | HCHU | HENGCHENG INTERNATIONAL SUPPLY CHAIN CO., LTD | | PRC | BIC |
| 7 | HCHU | HUNCHUN FANHAI INTERNATIONAL FORWAR | | | SCAC4 |
| 8 | HCHX | Heyden Chemical Corp. | 7/1930-1/1946; 4/1947 (not listed) | | NAKINA |
| 9 | HCHX | Heyden Chemical Corp. | Apr-38 | | NRHS |
| 10 | HCHX | HEYDEN CHEMICAL CORP. | | | PWRC |
| 11 | HCHY | HERNDON, C HAYNE | | | SCAC4 |
