| Abbreviation | Definition |
|---|---|
| AROW | Arrow Financial Corporation |
| AROYF | A G Armeno Mines & Minerals, Inc. |
| ARQL | Arqule, Inc. |
| ARRO | Arrow International, Inc. |
| ARSC | Aris Corporation |
| ARSD | Arabian Shield Development Company |
| ARSI | Air Rite Systems International, Inc. |
| ARTC | Arthrocare Corporation |
| ARTG | Art Technology Group, Inc. |
| ARTI | Artisan Components, Inc. |
| ARTL | Aristotle Corporation |
| ARTM | American Nortel Communications, Inc. |
| ARTNA | Artesian Resources Corporation Class A |
| ARTNB | Artesian Resources Corporation Class B |
| ARTT | Advanced Radio Telecom |
| ARTW | Arts Way Manufacturing Company, Inc. |
| ARVL | Arval Holdings, Inc. |
| ARVX | Aerovox, Inc. |
| ARWA | American Railway Systems |
| ARWM | Arrow Magnolia International, Inc. |