| Abbreviation | Definition |
|---|---|
| HMAX | Huntsman Corporation |
| HMAX | Huntsman Petrochemical |
| HMCR | Huntsville and Madison County Railroad |
| HMCR | Huntsville and Madison County Railroad Authority |
| HMCX | HoltraChem Manufacturing |
| HMCX | HoltraChem Manufacturing Company LLC |
| HMFX | Florida Rock Industries (Vulcan Materials) |
| HMFX | Florida Rock Industries Incorporated |
| HMHU | Hoover Materials Handling Group |
| HMIX | Henkels and McCoy |
| HMIX | Henkels and McCoy Inc |
| HMJX | Helm Financial Corporation |
| HMR | Hoboken Manufacturers |
| HMWX | Heckett MultiServ |
| HN | Hutchinson and Northern Railway |
| HN | Hutchinson and Northern Railway Company |
| HNPU | Navale Et Commerciale Havraise Penninsulaire |
| HNSU | Triton Container International |
| HOCU | Hoegh Container Lines |
| HOCX | Head-On Collision Line |