| Abbreviation | Definition |
|---|---|
| ATFI | Allen Temple Foundation Inc |
| ATFI | Applied Thin Films Inc |
| ATFK | Atkinson Freight Lines Corporation |
| ATFL | Agro Tech Foods Limited |
| ATFL | Agro Tech Foods Ltd |
| ATFL | Agro Tech Foods, LTD. |
| ATG | Art Technology Group |
| ATHC | Australian Truck Hire Company |
| ATI | Advanced Training Institute |
| ATI | Allegheny Technologies Inc |
| ATI | American Training International |
| ATI | American Transtech Inc |
| ATI | Array Technologies Inc |
| ATI | Ati Technologies Incorporated |
| ATIC | American Traditions Insurance Company |
| ATIC | American Transit Insurance Company |
| ATII | Asia Tech Image Inc |
| ATIL | Aviation Training International Ltd |
| ATIS | Automatic Taxi Instruction Service |
| ATL | Accredited Testing Laboratory |