AZ Alkmaar U21: every transfer in and out, fees paid and earned, squad market value, €275k spent and €150k earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-02-03 | Frej Elkjær | Aarhus GF U19 | AZ Alkmaar U21 | — |
| 2026-01-26 | Sem van Duijn | AZ Alkmaar U21 | Telstar | Loan |
| 2026-01-12 | Kasper Boogaard | AZ Alkmaar U21 | AZ Alkmaar | — |
| 2025-09-02 | Andrea Natali | Leverkusen U19 | AZ Alkmaar U21 | Loan |
| 2025-08-15 | Finn Stam | AZ Alkmaar U21 | Willem II | Loan |
| 2025-08-04 | Billy van Duijl | AZ Alkmaar U21 | AZ Alkmaar | — |
| 2025-07-11 | Rodrigo Macedo | Braga B | AZ Alkmaar U21 | — |
| 2025-07-10 | Tristan Kuijsten | AZ Alkmaar U21 | Almere City | — |
| 2025-07-01 | Wassim Bouziane | AZ U19 | AZ Alkmaar U21 | — |
| 2025-07-01 | Elijah Dijkstra | AZ Alkmaar U21 | AZ Alkmaar | — |
| 2025-01-07 | Ro-Zangelo Daal | AZ Alkmaar U21 | AZ Alkmaar | — |
| 2024-07-10 | Finn Stam | AZ Alkmaar U21 | FC Groningen | Loan |
| 2024-07-01 | Sem van Duijn | Quick Boys | AZ Alkmaar U21 | €275k |
| 2024-07-01 | Kees Smit | AZ Alkmaar U21 | AZ Alkmaar | — |
| 2024-07-01 | Kasper Boogaard | AZ U18 | AZ Alkmaar U21 | — |
| 2024-07-01 | Julian Oerip | AZ U18 | AZ Alkmaar U21 | — |
| 2024-07-01 | Iman Griffith | AZ Alkmaar U21 | Roda JC | Free |
| 2024-07-01 | Elijah Dijkstra | AZ U18 | AZ Alkmaar U21 | — |
| 2024-07-01 | Dave Kwakman | AZ Alkmaar U21 | AZ Alkmaar | — |
| 2024-07-01 | Daniël Deen | AZ Alkmaar U21 | AZ Alkmaar | — |