| Jeremy STOTT | CAN | 2 Races |
| Angel STOYANOV | BUL | 4 Races |
| Georgi STOYCHEV | BUL | 2 Races |
| Natali STOYCHEVA | BUL | 6 Races |
| Krasimira STOYCHEVA | SRB | 6 Races |
| Henrik STRAND | SWE | 23 Races |
| Patrik STRÁNSKY | SVK | 9 Races |
| Stefan STRAT | ROU | 17 Races |
| Stefan Andrei STRAT | ROU | 2 Races |
| Krists STRAUME | LAT | 2 Races |
| Kostja STROINSKI | GER | 30 Races |
| Rahmads STROMANIS | LAT | 5 Races |
| Rahmats STROMANIS | LAT | 6 Races |
| Declan STRONG | GBR | 2 Races |
| James STYAN | GBR | 14 Races |