1.FC K'lautern: every transfer in and out, fees paid and earned, squad market value, €9.2m spent and €23m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-02-02 | Mergim Berisha | Hoffenheim | 1.FC K'lautern | Free |
| 2026-01-30 | Jacob Rasmussen | Salzburg | 1.FC K'lautern | €1m |
| 2026-01-29 | Afeez Aremu | 1.FC K'lautern | Aberdeen FC | €150k |
| 2026-01-21 | Atanas Chernev | Estrela Amadora | 1.FC K'lautern | Loan |
| 2026-01-12 | Faride Alidou | 1.FC K'lautern | E. Braunschweig | Loan |
| 2025-08-04 | Naatan Skyttä | USL Dunkerque | 1.FC K'lautern | €1.8m |
| 2025-07-22 | Ji-soo Kim | Brentford | 1.FC K'lautern | Loan |
| 2025-07-01 | Ragnar Ache | 1.FC K'lautern | 1.FC Köln | €4.5m |
| 2025-07-01 | Mahir Emreli | 1.FC Nuremberg | 1.FC K'lautern | Free |
| 2025-07-01 | Ivan Prtajin | Union Berlin | 1.FC K'lautern | €1m |
| 2025-02-03 | Tim Breithaupt | Augsburg | 1.FC K'lautern | Loan |
| 2025-01-27 | Maximilian Bauer | Augsburg | 1.FC K'lautern | Loan |
| 2025-01-23 | Faride Alidou | Frankfurt | 1.FC K'lautern | — |
| 2025-01-22 | Grant-Leon Ranos | Mönchengladbach | 1.FC K'lautern | Loan |
| 2025-01-15 | Simon Simoni | Frankfurt | 1.FC K'lautern | Loan |
| 2024-08-30 | Daisuke Yokota | KAA Gent | 1.FC K'lautern | Loan |
| 2024-07-01 | Julian Niehues | 1.FC K'lautern | Heidenheim | Free |
| 2024-01-29 | Andreas Luthe | 1.FC K'lautern | VfL Bochum | — |
| 2024-01-02 | Frank Ronstadt | Darmstadt 98 | 1.FC K'lautern | €50k |
| 2024-01-01 | Filip Stojilkovic | Darmstadt 98 | 1.FC K'lautern | Loan |