Sparta U21: every transfer in and out, fees paid and earned, squad market value and €200k earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-02-03 | Jelani Seedorf | Sparta U21 | Telstar | €200k |
| 2026-01-01 | Lushendry Martes | Sparta U21 | Sparta R. | — |
| 2025-10-01 | Ayoni Santos | Sparta U21 | Sparta R. | — |
| 2025-09-01 | Giannino Vianello | Sparta U21 | Sparta R. | — |
| 2025-09-01 | Dylan Tevreden | Sparta U21 | Vitesse U21 | — |
| 2025-08-11 | Khaled Razak | Willem II | Sparta U21 | — |
| 2025-07-01 | Quincy Hoeve | FC Volendam | Sparta U21 | — |
| 2025-07-01 | Max de Ligt | Sparta U21 | Sparta R. | — |
| 2025-07-01 | Lushendry Martes | Sparta U19 | Sparta U21 | — |
| 2025-07-01 | Ayoub Oufkir | Sparta U21 | Sparta R. | — |
| 2025-02-04 | Jelani Seedorf | Excelsior U21 | Sparta U21 | Free |
| 2025-01-28 | Quincy Hoeve | FC Volendam | Sparta U21 | Loan |
| 2024-11-01 | Marvin Young | Sparta U21 | Sparta R. | — |
| 2024-07-17 | Jay den Haan | Sparta U21 | Telstar | Free |
| 2024-07-09 | Mehmet Yüksel | Sparta U21 | Sanliurfaspor | Free |
| 2024-07-01 | Giannino Vianello | Sparta R. U18 | Sparta U21 | — |
| 2024-07-01 | Devin Remie | Utrecht U21 | Sparta U21 | Free |
| 2024-07-01 | Delano Vianello | Sparta U21 | Without Club | — |
| 2024-07-01 | Dean Zandbergen | Sparta U21 | FC Dordrecht | Free |
| 2024-07-01 | Ayoub Oufkir | Sparta R. U18 | Sparta U21 | — |