| JKD | | JKM LNG (Platts) Balmo Future | Liquified Natural Gas | IFEU | |
| JKM | | JKM LNG (PLATTS) Future | Liquified Natural Gas | IFEU | |
| | John Day N-S Physical Off-Peak (bilateral) | Electricity | IEPA | |
| | John Day N-S Physical Peak (bilateral) | Electricity | IEPA | |
| JMA | | Johnson Matthey PLC | Single Stock Options | IFLO | |
| | Jojoba Physical Off-Peak (bilateral) | Electricity | IEPA | |
| | Jojoba Physical Peak (bilateral) | Electricity | IEPA | |
| KTB | | Katy Basis Future | Natural Gas | IFED | |
| XSE | | Katy Enstor (HSC) Physical Inside FERC | Natural Gas | IEPA | |
| XRO | | Katy Enstor Physical Basis LD1 | Natural Gas | IEPA | |
| XRQ | | Katy Enstor Physical Fixed Price Monthly | Natural Gas | IEPA | |
| XRP | | Katy Enstor Physical Fixed Price Spot | Natural Gas | IEPA | |
| XRS | | Katy Enstor Physical Gas Daily Monthly | Natural Gas | IEPA | |
| XRR | | Katy Enstor Physical Gas Daily Spot | Natural Gas | IEPA | |
| YFL | | Katy Enstor Physical Inside FERC | Natural Gas | IEPA | |
| KTI | | Katy Index Future | Natural Gas | IFED | |
| XU7 | | Katy Oasis (HSC) Physical Inside FERC | Natural Gas | IEPA | |
| XU4 | | Katy Oasis Physical Basis LD1 | Natural Gas | IEPA | |
| XU3 | | Katy Oasis Physical Fixed Price Monthly | Natural Gas | IEPA | |
| XU2 | | Katy Oasis Physical Fixed Price Spot | Natural Gas | IEPA | |
| XU6 | | Katy Oasis Physical Gas Daily Monthly | Natural Gas | IEPA | |
| XU5 | | Katy Oasis Physical Gas Daily Spot | Natural Gas | IEPA | |
| YFM | | Katy Oasis Physical Inside FERC | Natural Gas | IEPA | |
| KTS | | Katy Swing Future | Natural Gas | IFED | |
| KSS | | Kern Delivered Swing Future | Natural Gas | IFED | |
| KGF | | Kingfisher PLC | Single Stock Options | IFLO | |
| YEL | | KRGT Del Pool Physical Fixed Price Monthly | Natural Gas | IEPA | |
| YEK | | KRGT Del Pool Physical Fixed Price Spot | Natural Gas | IEPA | |
| YEN | | KRGT Del Pool Physical Gas Daily Monthly | Natural Gas | IEPA | |
| YEM | | KRGT Del Pool Physical Gas Daily Spot | Natural Gas | IEPA | |
| YEO | | KRGT Del Pool Physical Natural Gas Intelligence | Natural Gas | IEPA | |
| YEQ | | KRGT Rec Pool Physical Fixed Price Monthly | Natural Gas | IEPA | |
| YEP | | KRGT Rec Pool Physical Fixed Price Spot | Natural Gas | IEPA | |
| YES | | KRGT Rec Pool Physical Gas Daily Monthly | Natural Gas | IEPA | |
| YER | | KRGT Rec Pool Physical Gas Daily Spot | Natural Gas | IEPA | |
| YEH | | KRGT Rec Pool Physical Inside Ferc | Natural Gas | IEPA | |
| LS | | Land Securities Group PLC | Single Stock Options | IFLO | |
| LGE | | Legal And General Group PLC | Single Stock Options | IFLO | |
| YQJ | | Leidy-Transco Physical Basis LD1 | Natural Gas | IEPA | |
| YQE | | Leidy-Transco Physical Fixed Price Spot | Natural Gas | IEPA | |
| YQH | | Leidy-Transco Physical Gas Daily Monthly | Natural Gas | IEPA | |
| YQG | | Leidy-Transco Physical Gas Daily Spot | Natural Gas | IEPA | |
| YQI | | Leidy-Transco Physical Inside FERC | Natural Gas | IEPA | |
| YQF | | Leidy-Transco Physical Price Monthly | Natural Gas | IEPA | |
| TSB | | Lloyds Banking Group PLC | Single Stock Options | IFLO | |
| C1 | | London Cocoa 1-Month Calendar Spread Option | Cocoa | IFLX | |
| C2 | | London Cocoa 2-Month Calendar Spread Option | Cocoa | IFLX | |
| C | | London Cocoa Options | Cocoa | IFLX | |
| LSE | | London Stock Exchange Group PLC | Single Stock Options | IFLO | |
| 8LS | | London Stock Exchange Group plc Mini | Mini Single Stocks | IFLO | |