| Abbreviation | Definition |
|---|---|
| AQS | AccuTerm Quoting System |
| ARB | Arbitrage |
| ARC | Auction Rate securities Certificate |
| ArcaEx | Archipelago Exchange |
| ARN | Annual Review Note |
| ARS | Auction Rate Securities |
| ASAS | Amsterdam Security Account System |
| ASC | Alberta Securities Commission |
| ASCI | Argus Sour Crude Index |
| ASCOT | Asset Swap Callable Option Trade |
| ASE | Alberta Stock Exchange |
| ASE | Amman Stock Exchange |
| ASE | Amsterdam Stock Exchange |
| ASE | Association of Swiss Exchanges |
| ASE | Athens Stock Exchange |
| ASEA | African Stock Exchange Association |
| ASET | Amman Stock Exchange Trading system |
| ASIC | Australian Securities and Investments Commission |
| ASL | Aggregate Stop-loss Limit |
| ASX | Australian Securities Exchange |