Mainz 05 U17: every transfer in and out, fees paid and earned, squad market value.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2024-08-13 | Conrad Scholl | Mainz 05 U17 | SV Ried II | Free |
| 2024-07-01 | Kacper Potulski | Mainz 05 U17 | Mainz 05 U19 | — |
| 2023-07-01 | Maxim Dal | Mainz 05 U17 | Mainz 05 U19 | — |
| 2023-07-01 | Kacper Potulski | Legia U19 | Mainz 05 U17 | Free |
| 2023-07-01 | Conrad Scholl | Mainz 05 Yth. | Mainz 05 U17 | — |
| 2022-07-01 | İzzet Erdal | Mainz 05 U17 | Mainz 05 U19 | — |
| 2022-07-01 | Maxim Dal | Mainz 05 Yth. | Mainz 05 U17 | — |
| 2022-07-01 | Daniel Gleiber | Mainz 05 U17 | Mainz 05 U19 | — |
| 2022-07-01 | Aiman Dardari | Mainz 05 U17 | Mainz 05 U19 | — |
| 2022-01-01 | Nelson Weiper | Mainz 05 U17 | Mainz 05 U19 | — |
| 2021-07-01 | İzzet Erdal | Mainz 05 Yth. | Mainz 05 U17 | — |
| 2021-07-01 | Dennis Kaygin | Mainz 05 U17 | Mainz 05 U19 | — |
| 2021-07-01 | Daniel Gleiber | Mainz 05 Yth. | Mainz 05 U17 | — |
| 2021-07-01 | Brajan Gruda | Mainz 05 U17 | Mainz 05 U19 | — |
| 2021-07-01 | Aiman Dardari | Düdelingen U17 | Mainz 05 U17 | Free |
| 2020-07-01 | Nelson Weiper | Mainz 05 Yth. | Mainz 05 U17 | — |
| 2020-07-01 | Lasse Wilhelm | Mainz 05 U17 | Mainz 05 U19 | — |
| 2020-07-01 | Eniss Shabani | Mainz 05 U17 | Mainz 05 U19 | — |
| 2020-07-01 | Dennis Kaygin | Mainz 05 Yth. | Mainz 05 U17 | — |
| 2020-07-01 | Brajan Gruda | Mainz 05 Yth. | Mainz 05 U17 | — |