Siem Jansma
Netherlands (NED)
February 2013 (MC1)
Personal Records
| 500m | 53,96 | 21 March 2025 | Heerenveen (NED) |
| 1000m | 1.56,65 | 28 February 2026 | Dresden (GER) |
Season Bests
| 100m | 14,71 | 21 December 2025 | Deventer (NED) |
| 300m | 35,27 | 22 March 2026 | Heerenveen (NED) |
| 500m | 53,99 | 22 March 2026 | Heerenveen (NED) |
| 700m | 1.24,90 | 24 January 2026 | Deventer (NED) |
| 1000m | 1.56,65 | 28 February 2026 | Dresden (GER) |
| 100m | 14,88 | 16 February 2025 | Deventer (NED) |
| 300m | 37,58 | 21 March 2025 | Heerenveen (NED) |
| 500m | 53,96 | 21 March 2025 | Heerenveen (NED) |
| 100m | 15,68 | 10 March 2024 | Heerenveen (NED) |
| 300m | 43,51 | 10 March 2024 | Heerenveen (NED) |
| 500m | 1.17,65 | 2 December 2023 | Enschede (NED) |
| 100m | 17,81 | 4 March 2023 | Deventer (NED) |
| 300m | 49,84 | 4 March 2023 | Deventer (NED) |
Results
| Hans Westerhof Recordwedstrijden | Heerenveen (NED) | 22 March 2026 | ||||||||||||||||
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| 29. Int. Elbepokal | Dresden (GER) | 28 February - 1 March 2026 | ||||||||||||||||
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| Clubkampioenschap Deventer IJsclub | Deventer (NED) | 24 January 2026 | ||||||||||||||||
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| Pupillenwedstrijd + Mass Start | Deventer (NED) | 21 December 2025 | ||||||||||||||||
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| HIJC Pupillen Interclub | Enschede (NED) | 25 October 2025 | ||||||||||||||||
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Native Language Names