| Abbreviation | Definition |
|---|---|
| HKZZ | Hong Kong Islands Line |
| HKZZ | Hong Kong Islands Line America, S. A. |
| HLBZ | Hill Brothers Transportation |
| HLCU | Hapag-Lloyd |
| HLCU | Hapag-Lloyd A G |
| HLCX | Helm Financial Corporation |
| HLCX | Helm Leasing |
| HLER | Hamilton & Lake Erie Railway |
| HLEX | Hunstman Polymers Corporation |
| HLGX | Helm Financial Corporation |
| HLLX | Helm Financial Corporation |
| HLLX | Helm Locomotive Leasing |
| HLMX | Helm Financial Corporation |
| HLNE | Hillsboro and North Eastern Railway |
| HLPX | Houston Lighting and Power |
| HLSC | Hampton Railway |
| HLSC | Hampton Railway Incorporated |
| HLTX | Amoco Oil |
| HLXU | Hapag-Lloyd |
| HLXZ | Hapag-Lloyd |