| Abbreviation | Definition |
|---|---|
| AAVC | Albion Venture |
| AAZ | Anglo Asian |
| ABAA | Aberdeen All (de-listed) |
| ABB | Abbey Protection, P.L.C. |
| ABBY | Abbey, P.L.C. |
| ABC | Abcam, P.L.C. |
| ABD | Aberdeen New Dawn Investment Trust, P.L.C. |
| ABF | Associated British Foods, P.L.C. |
| ABG | African Barr |
| ABH | Angel Biotech |
| ABL | Ablon Group, Limited |
| ABM | Albemarle & Bd. |
| ABNY | Albany It |
| ABR | Absolute Return Trust, LTD., STG shares |
| ABRE | Absolute Return Trust, LTD., European Shares |
| ABTX | Aqua Bty Reg S |
| ACBD | Alpha Bk.gdr |
| ACBE | Alpha Bk.gdr S |
| ACC | Access Intelligence, P.L.C. |
| ACD | Acencia |