| Name | Code |
|---|
|
| American Stock Exchange Options | 1 |
| Aqua ATS | 72 |
| ARCAEDGE Bulletin Board | 42 |
| Archipelago Exchange | 39 |
| ATTAIN ECN | 40 |
| BATS | 54 |
| BIDS | 55 |
| BlockCross ATS | 66 |
| BlockMatch | 69 |
| Bloomberg TradeBook | 31 |
| BondBook | 32 |
| BondClick | 35 |
| BondHub | 36 |
| Boston Options Exchange | 60 |
| BRUT ECN | 41 |
| Chicago Mercantile Exchange (CME) | 2 |
| Chi-X Canada | 68 |
| Chi-X Europe | 71 |
| Direct Edge | 57 |
| Direct Edge X | 56 |
| GETCO Execution Services ATS | 73 |
| Instinet ECN | 43 |
| IntercontinentalExchange, Inc. | 48 |
| International Securities Market Association (ISMA) | 15 |
| Island ECN | 44 |
| Jiway | 14 |
| Lava Trading | 59 |
| Level ATS | 58 |
| LIMITrader | 37 |
| Liquidnet | 62 |
| London International Financial Futures Exchange (LIFFE) | 3 |
| London Traded Options Market | 5 |
| MarketAxess | 33 |
| MarketXT ECN | 45 |
| MATCH ATS - Canada | 67 |
| MEFF Renta Variable | 16 |
| Montreal Traded Options Market | 6 |
| MuniCenter | 34 |
| NASDAQ OMX BX | 70 |
| NASDAQ Options Market | 64 |
| National Stock Exchange | 61 |
| New York Mercantile Exchange (NYMEX) | 12 |
| Nex Trade ECN | 46 |
| None | None |
| Non-exchange-based Over The Counter Market | 11 |
| NQLX | 49 |
| NYFIX Euro Millenium | 63 |
| NYFIX Millennium | 13 |
| NYSE BBSS (broker booth system) | 10 |
| OneChicago | 50 |
| Pacific Stock Exchange Options (PAO) | 8 |
| Pipeline | 53 |
| POSIT | 4 |
| REDIBook ECN | 47 |
| [Removed Jan 10, 2001] New York Stock Exchange Options (NYO) | 7 |
| Stockholm Options Market | 17 |
| Track ECN (DATA) | 51 |
| Track ECN (TRAC) | 52 |
| TradeWeb | 30 |
| UBS PIN ATS | 65 |
| Vancouver Options Exchange (VAO) | 9 |
| Visible Market | 38 |
