| Abbreviation | Definition |
|---|---|
| AMV | Amerivest Properties, Inc., of Delaware |
| AMW | Amwest Insurance Group, Inc. |
| ANA | Acadiana Bancshares, Inc. (de-listed) |
| ANA | Acadiana Bancshares, Inc. (de-listed) |
| ANA | Acadiana Bancshares, Inc., of Louisiana |
| AND | Andrea Electronic Corporation |
| ANE | Alliance Bancorp of New England, Inc. |
| ANE | Alliance Bancorp of New England, Incorporated |
| ANH | Anworth Mortgage Asset Corporation |
| ANK | Atlantic Tele-Network, Inc. |
| AOI | Apple Orthodontix, Inc. |
| AOP | AppOnline Communications, Inc. |
| AOP | AppOnline Communications, Inc. (de-listed) |
| AOP | AppOnline Communications, Inc. (de-listed) |
| API | Advanced Photonix, Inc. |
| APL | Atlas Pipeline Partners, L. P. |
| APO | American Community Properties Trust |
| APR | Automatic Picture Replacement |
| ASB | Salomon Smith Barney Holdings I |
| ASE | American Science & Engineering, Inc. |