Winterthur U21: every transfer in and out, fees paid and earned, squad market value.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2025-08-02 | Ledjan Sahitaj | Winterthur U21 | FC Winterthur | — |
| 2025-07-01 | Tibault Citherlet | Winterthur U21 | FC Winterthur | — |
| 2024-02-02 | Ledjan Sahitaj | Parma U19 | Winterthur U21 | — |
| 2023-07-01 | Yannick Bujard | Winterthur U21 | FC Gossau | Free |
| 2023-07-01 | Tibault Citherlet | Winterthur U18 | Winterthur U21 | — |
| 2023-07-01 | Loïc Lüthi | Winterthur U21 | FC Winterthur | — |
| 2022-08-01 | Loïc Lüthi | Winterthur U21 | SC Kriens | Loan |
| 2022-01-01 | Loïc Lüthi | Winterthur U21 | FC Seuzach | Loan |
| 2021-07-01 | Loïc Lüthi | Winterthur U18 | Winterthur U21 | — |
| 2020-07-06 | Sayfallah Ltaief | Winterthur U21 | FC Winterthur | — |
| 2018-07-20 | Sayfallah Ltaief | FC Zürich U18 | Winterthur U21 | — |
| 2017-11-19 | Gabriel Isik | Winterthur U21 | FC Winterthur | — |
| 2017-08-02 | Amir Saipi | Schaffh. Yth. | Winterthur U21 | Loan |
| 2017-07-01 | Gabriel Isik | Winterthur U18 | Winterthur U21 | — |
| 2014-07-01 | Manuel Akanji | Winterthur U21 | FC Winterthur | — |
| 2013-07-01 | Manuel Akanji | Winterthur U18 | Winterthur U21 | — |
| 2010-07-01 | Remo Freuler | Winterthur U21 | GC Zürich U21 | — |