Sparta Rotterdam (Eredivisie): every transfer in and out, fees paid and earned, squad market value, €4.9m spent and €35m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-07-01 | Tobias Lauritsen | Sparta R. | Without Club | — |
| 2026-07-01 | Tijs Velthuis | Sparta R. | PEC Zwolle | €150k |
| 2026-07-01 | Saïd Bakari | Sparta R. | Without Club | — |
| 2026-07-01 | Pelle Clement | Sparta R. | Without Club | — |
| 2026-07-01 | Joshua Kitolano | Sparta R. | Bodø/Glimt | Free |
| 2026-07-01 | Jonathan de Guzmán | Sparta R. | Retired | — |
| 2026-07-01 | Casper Terho | OH Leuven | Sparta R. | €600k |
| 2026-02-03 | Tijs Velthuis | Sparta R. | PEC Zwolle | Loan |
| 2026-02-03 | Nökkvi Thórisson | Sparta R. | Telstar | Loan |
| 2026-02-03 | Milan Zonneveld | Telstar | Sparta R. | — |
| 2026-02-02 | Casper Terho | OH Leuven | Sparta R. | Loan |
| 2026-01-20 | Alwande Roaldsøy | Molde FK | Sparta R. | — |
| 2026-01-16 | Lance Duijvestijn | Sparta R. | Fortuna Sittard | Loan |
| 2026-01-09 | Vito van Crooij | NEC Nijmegen | Sparta R. | Loan |
| 2026-01-01 | Lushendry Martes | Sparta U21 | Sparta R. | — |
| 2026-01-01 | Ayoub Oufkir | Sparta R. | AZ Alkmaar | €5m |
| 2025-10-01 | Ayoni Santos | Sparta U21 | Sparta R. | — |
| 2025-09-01 | Giannino Vianello | Sparta U21 | Sparta R. | — |
| 2025-08-18 | Mitchell van Bergen | FC Twente | Sparta R. | €500k |
| 2025-08-15 | Shurandy Sambo | Burnley | Sparta R. | Loan |