| WFA | | LPG (BLPG3) FFA Houston to Chiba (Baltic) Future | Wet Freight | IFEU | |
| MNG | | M&G PLC | Single Stock Options | IFLO | |
| NGI | | M-RETS Registered Renewable Energy Certificate from CRS Listed™ Wind Energy Facilities Back Half Specific Future | Physical Environmental | IFED | |
| NGH | | M-RETS Registered Renewable Energy Certificate from CRS Listed™ Wind Energy Facilities Front Half Specific Future | Physical Environmental | IFED | |
| MLN | | Malin Basis Future | Natural Gas | IFED | |
| MAF | | Malin Fixed Price Future | Natural Gas | IFED | |
| MIS | | Malin Index Future | Natural Gas | IFED | |
| MSS | | Malin Swing Future | Natural Gas | IFED | |
| EMG | | Man Group Plc | Single Stock Options | IFLO | |
| 8MZ | | Marks & Spencer Group plc Mini | Mini Single Stocks | IFLO | |
| M+S | | Marks And Spencer Group Plc | Single Stock Options | IFLO | |
| MDB | | Maryland Compliance Non-Black Liquor Non-Waste Renewable Energy Credit Tier 1 Future | Physical Environmental | IFED | |
| MDE | | Maryland Compliance Renewable Energy Credit Tier 1 Future | Physical Environmental | IFED | |
| MPY | | Maryland Compliance Renewable Energy Credit Tier 1 Prior Year Future | Physical Environmental | IFED | |
| MDX | | Maryland Solar Renewable Energy Credit Future | Physical Environmental | IFED | |
| MCL | | Massachusetts Compliance Renewable Energy Certificate Class I Future | Physical Environmental | IFED | |
| MS2 | | Massachusetts Solar Renewable Energy Certificate Carve Out II Future | Physical Environmental | IFED | |
| MBX | | Mead 230 Day-Ahead Off-Peak Fixed Price Future | Electricity | IFED | |
| MBW | | Mead 230 Day-Ahead Peak Fixed Price Future | Electricity | IFED | |
| I05 | | Medium BTP Future | Medium/Long Term Interest Rates | IFLL | |
| G05 | | Medium Bund Futures (Bobl) | Medium/Long Term Interest Rates | IFLL | |
| BFM | | Medium French Government Bond Future (OAT) | Medium/Long Term Interest Rates | IFLL | |
| 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 | |
| NMC | | Michcon Basis Future | Natural Gas | IFED | |
| FQM | | Michcon Fixed Price Future | Natural Gas | IFED | |
| NMI | | Michcon Index Future | Natural Gas | IFED | |
| 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 | |
| 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 | |
| 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 | |
| MRB | | Millennium East Pool Basis Future | Natural Gas | IFED | |
| MRA | | Millennium East Pool Index Future | Natural Gas | IFED | |
| MRC | | Millennium East Pool Swing Future | Natural Gas | IFED | |
| BM | | Mini Brent Crude Futures (100 BBL) | Crude Oil and Refined Products | IFSG | |