Mainz 05 Yth.: every transfer in and out, fees paid and earned, squad market value.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2023-07-01 | Conrad Scholl | Mainz 05 Yth. | Mainz 05 U17 | — |
| 2022-07-01 | Maxim Dal | Mainz 05 Yth. | Mainz 05 U17 | — |
| 2021-07-01 | İzzet Erdal | Mainz 05 Yth. | Mainz 05 U17 | — |
| 2021-07-01 | Elias Benkara | Mainz 05 Yth. | Dortmund Yth. | Free |
| 2021-07-01 | Daniel Gleiber | Mainz 05 Yth. | Mainz 05 U17 | — |
| 2020-07-01 | İzzet Erdal | Duisburg Yth. | Mainz 05 Yth. | Free |
| 2020-07-01 | Nelson Weiper | Mainz 05 Yth. | Mainz 05 U17 | — |
| 2020-07-01 | Dennis Kaygin | Mainz 05 Yth. | Mainz 05 U17 | — |
| 2020-07-01 | Daniel Gleiber | FSV Frankf. Jgd | Mainz 05 Yth. | Free |
| 2020-07-01 | Conrad Scholl | Makkabi Yth. | Mainz 05 Yth. | Free |
| 2020-07-01 | Brajan Gruda | Mainz 05 Yth. | Mainz 05 U17 | — |
| 2019-07-01 | Lasse Wilhelm | Mainz 05 Yth. | Mainz 05 U17 | — |
| 2019-07-01 | Eniss Shabani | Mainz 05 Yth. | Mainz 05 U17 | — |
| 2018-07-01 | Paul Nebel | Mainz 05 Yth. | Mainz 05 U17 | — |
| 2018-07-01 | Brajan Gruda | Karlsruhe Yth. | Mainz 05 Yth. | Free |
| 2017-07-01 | Niklas Tauer | Mainz 05 Yth. | Mainz 05 U17 | — |
| 2017-07-01 | Lasse Rieß | Mainz 05 Yth. | Mainz 05 U17 | — |
| 2017-07-01 | Dennis Owusu | Mainz 05 Yth. | Mainz 05 U17 | — |
| 2016-07-01 | Paul Nebel | Offenbach Yth. | Mainz 05 Yth. | Free |
| 2016-07-01 | Merveille Papela | Mainz 05 Yth. | Mainz 05 U17 | — |