| Abbreviation | Definition |
|---|---|
| ANPI | AngioTech Pharmaceuticals, Inc. |
| ANSI | Advanced Neuromodulation Systems, Inc. |
| ANSR | AnswerThink Consulting Group |
| ANSS | A N S Y S, Inc. |
| ANST | Ansoft Corporation |
| ANSW | ANSWERS Corporation |
| ANSYS | ANSYS, Inc. |
| ANTC | Antec Corporation |
| ANTEN | Atlantic City Electric Company |
| ANTM | Antennas America, Inc. |
| ANTP | Phazar Corporation (formerly Antenna Products Corporation, Inc.) |
| ANTS | Ants Software.Com |
| ANTV | Antenna TV, S. A. |
| ANTX | Antex Biologics, Inc. |
| ANYI | Anything Internet Corporation |
| ANYX | Anyox Resources, Inc. |
| AOCMZ | A L C Communications Corporation (delisted) |
| AOMOY | AO Mosenergo |
| AOOO | Autoco.Com, Inc. (delisted) |
| AORGB | Allen Organ Company |