Gwylym Gibson has 4 recorded races.
| Date | Race | Distance | Time | Overall |
|---|---|---|---|---|
| TCS London Marathon 2026 | Marathon | 2:45:07 | 1097 | |
| TCS London Marathon 2024 | Marathon | 2:48:32 | 1580 | |
| BMW Berlin Marathon 2023 | Marathon | 2:37:06 | 482 | |
| TCS London Marathon 2022 | Marathon | 2:45:19 | 549 |