| Abbreviation | Definition |
|---|---|
| GHBX | G. Heileman Brewing Company, Incorporated |
| GHH | Galveston, Houston and Henderson Railroad |
| GHRD | Green Hills Rural Development - Chillicothe-Brunswick Rail Maintenance Authority |
| GHRD | Green Hills Rural Development (Chillicothe-Brunswick Rail Maintenance Authority) |
| GHRX | GHR Energy Corporation |
| GI | Gauge Invariance |
| GIEX | GATX Capital Corporation |
| GIEX | General American Marks (GATX Corporation) |
| GIHX | Cornerstone CandM Incorporated - Gifford Hill and Company |
| GIHX | Gifford-Hill (Hanson) |
| GILX | Gilman Paper |
| GILX | Gilman Paper Company |
| GIMX | GATX Capital Corporation |
| GIMX | General American Marks (GATX Corporation) |
| GIPU | Seacube Container Leasing |
| GITM | Golden Isles Terminal Railroad |
| GITM | Golden Isles Terminal Railroad Incorporated |
| GJ | Greenwich and Johnsonville Railway |
| GJR | Guelph Junction Railway |
| GKLX | Gold Kist |