| Abbreviation | Definition |
|---|---|
| AGRX | Agrifos |
| AGRX | Agrifos LLC |
| AGS | Alabama Great Southern Railroad |
| AGS | Alabama Great Southern Railroad Company |
| AGTX | AmeriGas Propane L. P. |
| AGYX | American Gypsum (Centrex Construction Products) |
| AGYX | Centrex Construction Products Inc (American Gypsum Company) |
| AHCX | Arcadian Corporation |
| AHMX | Altos Homos de Mexico de CV |
| AHMX | Altos Homos de Mexico S. A. de C. V. |
| AHT | Alaska Hydro-Train |
| AHW | Ahnapee and Western Railway (Fox Valley and Western) |
| AHW | Fox Valley and Western Limited |
| AHWZ | Ahnapee and Western Railway (Fox Valley and Western) |
| AHWZ | Fox Valley and Western Limited |
| AICX | Ancor International (Ashland Inc.) |
| AIDU | Albemarle Corporation |
| AIDU | Albermarle Corporation |
| AIEU | Aviation Import Export |
| AIEU | Aviation Import Export Incorporated |