| Abbreviation | Definition |
|---|---|
| AASIW | Advanced Aerodynamics & Structures, Incorporated Warrants (de-listed) |
| AASIZ | Advanced Aerodynamics & Structures, Inc. |
| AASP | All American SportPark, Inc. |
| AASR | Ascent Assurance |
| AATK | American Access Technology, Inc. |
| AAUK | Anglo American, P. L. C. |
| ABACF | Abacan Resource Corporation |
| ABACQ | Abacan Resource Corporation (in bankruptcy) |
| ABAN | American Bancshares, Inc. |
| ABANP | American Bancshares, Inc., Capital Trust |
| ABAX | Abaxis, Inc. |
| ABBK | Abington Bancorp, Inc. |
| ABBKP | Abington Bancorp, Inc., Capital Trust |
| ABBKP | Abington Bancorp, Inc., Capital Trust (de-listed) |
| ABBKP | Abington Bancorp, Inc., Capital Trust (de-listed) |
| ABCB | A B C Bancorp |
| ABCC | A B C Dispensing Technologies Company |
| ABCL | Alliance Bancorp, Inc. |
| ABCP | Ambase Corporation |
| ABCR | A B C Rail Products |