| Abbreviation | Definition |
|---|---|
| ARGNA | Amerigon, Inc. Class A |
| ARGNW | Amerigon, Inc. Warrants |
| ARGO | Argo Bancorp, Inc. |
| ARGX | Arguss Holdings, Inc. |
| ARGY | Argosy Education Group, Inc. |
| ARIA | Ariad Pharmaceuticals, Inc. |
| ARIAW | Ariad Pharmaceuticals, Inc. Warrants |
| ARINA | Arista Investors Corporation Class A |
| ARIS | A R I Network Service, Inc. |
| ARKR | Ark Restaurants Corporation |
| ARLCF | Arel Communications & Software, LTD. |
| ARLP | Alliance Resource Partners |
| ARLRF | Ariel Resources, LTD. |
| ARLWF | Arel Communications & Software, LTD. |
| ARMC | American Risk Management Company |
| ARMF | Armanino Foods of Distinction |
| ARMGA | A R M Financial Group Class A |
| ARMHY | A R M Holdings, P. L. C. |
| ARMX | Aramex International, LTD. |
| ARNX | Aronex Pharmaceuticals, Inc. |