| Abbreviation | Definition |
|---|---|
| ACME | Acme Communications |
| ACMI | Accumed International, Inc. |
| ACMID | Accumed International, Inc. |
| ACMIW | Accumed International, Inc. Warrants |
| ACMIW | Accumed International, Inc. Warrants (de-listed) |
| ACMIW | Accumed International, Inc. Warrants (de-listed) |
| ACMM | Accom, Inc. |
| ACMR | A. C. Moore Arts & Crafts |
| ACMT | Acmat Corporation |
| ACMTA | Acmat Corporation Class A |
| ACNAF | Air Canada Corporation |
| ACNB | A C N B Corporation |
| ACNC | Almance National Bank GRA (delisted) |
| ACOM | Agency.Com, LTD. |
| ACPI | American Consumer Products |
| ACRE | Amcare, Inc. |
| ACRG | A C R Group, Inc. |
| ACRI | Acacia Research Corporation |
| ACRN | Acorn Products, Inc. |
| ACRO | Acrodyne Communications, Inc. |