| SCL | | Socal Border Basis Future | Natural Gas | IFED | |
| SIS | | Socal Border Index Future | Natural Gas | IFED | |
| SSS | | Socal Border Swing Future | Natural Gas | IFED | |
| SCB | | Socal Citygate Basis Future | Natural Gas | IFED | |
| CVL | | Socal Citygate Fixed Price Future | Natural Gas | IFED | |
| SCI | | Socal Citygate Index Future | Natural Gas | IFED | |
| SCS | | Socal Citygate Swing Future | Natural Gas | IFED | |
| OPS | | Socal Fixed Price Future | Natural Gas | IFED | |
| GOV | | Solar GO Futures | Environmental | NDEX | |
| SON | | Sonat Basis Future | Natural Gas | IFED | |
| SOI | | Sonat Index Future | Natural Gas | IFED | |
| SOS | | Sonat Swing Future | Natural Gas | IFED | |
| SHH | | South32 | Single Stock Options | IFLO | |
| OUB | | Southern Star TX OK KS Basis Future | Natural Gas | IFED | |
| OUI | | Southern Star TX OK KS Index Future | Natural Gas | IFED | |
| OUS | | Southern Star TX OK KS Swing Future | Natural Gas | IFED | |
| DSB | | Spanish Power Financial Base Daily Futures | Electricity | NDEX | |
| SPB | | Spanish Power Financial Base Futures | Electricity | NDEX | |
| SPT | | Spark25S Pacific NWS to Tianjin LNG Freight Balmo Futures | Liquified Natural Gas | IFEU | |
| LFH | | Spark25S Pacific NWS to Tianjin LNG Freight Future | Liquified Natural Gas | IFEU | |
| SPA | | Spark30S Atlantic Sabine Pass to Gate LNG Freight Balmo Futures | Liquified Natural Gas | IFEU | |
| LFI | | Spark30S Atlantic Sabine Pass to Gate LNG Freight Future | Liquified Natural Gas | IFEU | |
| SNO | | SPP North Hub Day-Ahead Off-Peak Daily Fixed Price Future | Electricity | IFED | |
| FNO | | SPP North Hub Day-Ahead Off-Peak Fixed Price Future | Electricity | IFED | |
| SNR | | SPP North Hub Day-Ahead Peak Daily Fixed Price Future | Electricity | IFED | |
| FNP | | SPP North Hub Day-Ahead Peak Fixed Price Future | Electricity | IFED | |
| SPX | | SPP North Real-Time Off-Peak Daily Fixed Price Future | Electricity | IFED | |
| SPW | | SPP North Real-Time Peak Daily Fixed Price Future | Electricity | IFED | |
| SPF | | SPP South Hub Day-Ahead Off-Peak Daily Fixed Price Future | Electricity | IFED | |
| FSO | | SPP South Hub Day-Ahead Off-Peak Fixed Price Future | Electricity | IFED | |
| SPD | | SPP South Hub Day-Ahead Peak Daily Fixed Price Future | Electricity | IFED | |
| FSP | | SPP South Hub Day-Ahead Peak Fixed Price Future | Electricity | IFED | |
| SSO | | SPP South Hub Real-Time Off-Peak Daily Fixed Price Future | Electricity | IFED | |
| SSR | | SPP South Hub Real-Time Peak Daily Fixed Price Future | Electricity | IFED | |
| SSE | | SSE PLC | Single Stock Options | IFLO | |
| SJ5 | | St James Place Plc | Single Stock Options | IFLO | |
| SCB | | Standard Chartered Plc | Single Stock Options | IFLO | |
| 8ST | | Standard Chartered plc Mini | Mini Single Stocks | IFLO | |
| 8SS | | Strategy Inc - STND Future | Mini Stock Futures | IFLO | |
| SB1 | | Sugar No. 11 1-Month Calendar Spread Option | Sugar | IFUS | |
| SB2 | | Sugar No. 11 2-Month Calendar Spread Option | Sugar | IFUS | |
| SB | | Sugar No. 11 Options | Sugar | IFUS | |
| SHC | | Sulphur Outright – Argus Sulphur CFR China (Granular) Future | Crude Oil and Refined Products | IFEU | |
| SHE | | Sulphur Outright – Argus Sulphur FOB Middle East Future | Crude Oil and Refined Products | IFEU | |
| 8SZ | | Super Micro Computer Inc - STND Future | Mini Stock Futures | IFLO | |
| TCS | | Supramax Timecharter (Baltic) Freight Future | Dry Freight | IFEU | |
| SWL | | SWE LNG (Spark) Futures | Liquified Natural Gas | IFEU | |
| TAT | | Tate and Lyle Plc | Single Stock Options | IFLO | |
| TWN | | Taylor Wimpey Plc | Single Stock Options | IFLO | |
| WAK | | TC11 FFA South Korea to Singapore (Baltic) Future | Wet Freight | IFEU | |