| H | | Medium Gilt Future | Medium/Long Term Interest Rates | IFLL | |
| S05 | | Medium Spanish Government Bond Future | Medium/Long Term Interest Rates | IFLL | |
| C05 | | Medium Swiss Confederation Bond Future | Medium/Long Term Interest Rates | IFLL | |
| MLR | | Melrose Industries Plc | Single Stock Options | IFLO | |
| 8F8 | | Meta Platforms - STND Future | Mini Stock Futures | IFLO | |
| BMO | | Methanol Outright - Argus Methanol FOB Rotterdam Barge Future | Biofuels | IFEU | |
| BMN | | Methanol T2 FOB Rotterdam (ICIS) Future | Biofuels | IFEU | |
| | Mich Hub Day Ahead Financial Peak (bilateral) | Electricity | IEPA | |
| | Mich Hub Real Time Financial Off-Peak (bilateral) | Electricity | IEPA | |
| | Mich Hub Real Time Financial Peak (bilateral) | Electricity | IEPA | |
| NMC | | Michcon Basis Future | Natural Gas | IFED | |
| FQM | | Michcon Fixed Price Future | Natural Gas | IFED | |
| NMI | | Michcon Index Future | Natural Gas | IFED | |
| XKD | | Michcon Physical Basis LD1 | Natural Gas | IEPA | |
| XKA | | Michcon Physical Fixed Price Monthly | Natural Gas | IEPA | |
| XJZ | | Michcon Physical Fixed Price Spot | Natural Gas | IEPA | |
| XKC | | Michcon Physical Gas Daily Monthly | Natural Gas | IEPA | |
| XKB | | Michcon Physical Gas Daily Spot | Natural Gas | IEPA | |
| XKE | | Michcon Physical Inside FERC | Natural Gas | IEPA | |
| NMS | | Michcon Swing Future | Natural Gas | IFED | |
| ATI | | Micro Asia Tech 30 Index Futures | IFSG Indices | IFSG | |
| MCB | | Micro CoinDesk Bitcoin Futures | Bitcoin | IFSG | |
| SME | | Micro MSCI Europe Index Futures | IFSG Indices | IFSG | |
| SMU | | Micro MSCI USA Index Futures | IFSG Indices | IFSG | |
| 8M9 | | Microsoft Corporation - STND Future | Mini Stock Futures | IFLO | |
| | Mid-C Physical Off-Peak (bilateral) | Electricity | IEPA | |
| | Mid-C Physical Peak (bilateral) | Electricity | IEPA | |
| MXO | | Mid-Columbia Day-Ahead Off-Peak Daily Fixed Price Future | Electricity | IFED | |
| MDM | | Mid-Columbia Day-Ahead Off-Peak Daily Mini Fixed Price Future | Electricity | IFED | |
| OMC | | Mid-Columbia Day-Ahead Off-Peak Fixed Price Future | Electricity | IFED | |
| MPD | | Mid-Columbia Day-Ahead Peak Daily Fixed Price Future | Electricity | IFED | |
| MDD | | Mid-Columbia Day-Ahead Peak Daily Mini Fixed Price Future | Electricity | IFED | |
| MDC | | Mid-Columbia Day-Ahead Peak Fixed Price Future | Electricity | IFED | |
| ME9 | | Middle East Fuel Oil 180 CST FOB Arab Gulf Balmo Swap | Crude Oil and Refined | ICES | |
| MEA | | Middle East Fuel Oil 180 CST FOB Arab Gulf Swap | Crude Oil and Refined | ICES | |
| ME2 | | Middle East Fuel Oil 380 CST FOB Arab Gulf Swap | Crude Oil and Refined | ICES | |
| HOB | | Midland WTI 1st Line vs Dated Brent (Platts) Future | Crude Oil and Refined Products | IFED | |
| HOU | | Midland WTI American Gulf Coast Options | Crude Oil and Refined Products | IFEU | |
| | Midpoint Physical Off-Peak (bilateral) | Electricity | IEPA | |
| | Midpoint Physical Peak (bilateral) | Electricity | IEPA | |
| MRB | | Millennium East Pool Basis Future | Natural Gas | IFED | |
| MRA | | Millennium East Pool Index Future | Natural Gas | IFED | |
| YBA | | Millennium East Pool Physical Basis LD1 | Natural Gas | IEPA | |
| YAZ | | Millennium East Pool Physical Fixed Price Monthly | Natural Gas | IEPA | |
| YAY | | Millennium East Pool Physical Fixed Price Spot | Natural Gas | IEPA | |
| YBC | | Millennium East Pool Physical Gas Daily Monthly | Natural Gas | IEPA | |
| YBB | | Millennium East Pool Physical Gas Daily Spot | Natural Gas | IEPA | |
| YBD | | Millennium East Pool Physical Inside FERC | Natural Gas | IEPA | |
| MRC | | Millennium East Pool Swing Future | Natural Gas | IFED | |
| BM | | Mini Brent Crude Futures (100 BBL) | Crude Oil and Refined Products | IFSG | |