1.FC Köln Yth.: every transfer in and out, fees paid and earned, squad market value.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2023-07-01 | Fynn Schenten | 1.FC Köln Yth. | 1.FC Köln U17 | — |
| 2022-07-01 | Youssoupha Niang | 1.FC Köln Yth. | 1.FC Köln U17 | — |
| 2021-08-01 | Kerim Alajbegovic | 1.FC Köln Yth. | Leverkusen Yth. | Free |
| 2021-07-01 | Fayssal Harchaoui | 1.FC Köln Yth. | 1.FC Köln U17 | — |
| 2020-07-01 | Fayssal Harchaoui | SC West Yth. | 1.FC Köln Yth. | Free |
| 2020-07-01 | Elias Bakatukanda | 1.FC Köln Yth. | 1.FC Köln U17 | — |
| 2020-01-01 | Justin Diehl | 1.FC Köln Yth. | 1.FC Köln U17 | — |
| 2019-07-01 | Youssoupha Niang | Bonner SC Yth. | 1.FC Köln Yth. | Free |
| 2019-07-01 | Namory Cisse | 1.FC Köln Yth. | 1.FC Köln U17 | — |
| 2019-07-01 | Jonas Urbig | 1.FC Köln Yth. | 1.FC Köln U17 | — |
| 2019-07-01 | Elione Fernandes Neto | 1.FC Köln Yth. | Fort. Köln Yth. | Free |
| 2018-07-01 | Jens Castrop | 1.FC Köln Yth. | 1.FC Köln U17 | — |
| 2018-07-01 | Florian Wirtz | 1.FC Köln Yth. | 1.FC Köln U17 | — |
| 2018-01-01 | Tim Lemperle | 1.FC Köln Yth. | 1.FC Köln U17 | — |
| 2017-10-13 | Namory Cisse | W. Innsbruck J. | 1.FC Köln Yth. | Free |
| 2017-07-01 | Yılmaz Aktaş | 1.FC Köln Yth. | FC Pesch Jgd. | Free |
| 2017-07-01 | Tim Lemperle | FSV Frankf. Jgd | 1.FC Köln Yth. | Free |
| 2017-07-01 | Robert Voloder | 1.FC Köln Yth. | 1.FC Köln U17 | — |
| 2017-07-01 | Can Bozdogan | 1.FC Köln Yth. | 1.FC Köln U17 | — |
| 2017-01-01 | Noah Katterbach | 1.FC Köln Yth. | 1.FC Köln U17 | — |