Rot-Weiß Oberhausen (2. Bundesliga): every transfer in and out, fees paid and earned, squad market value and €80k earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-08-22 | Player | Rot-Weiß Oberhausen | Sportfreunde Siegen | Free |
| 2026-07-21 | Nicolas Glaus | Grasshopper Club Zurich | Rot-Weiß Oberhausen | Free |
| 2026-07-20 | Kevin Kratzsch | Rot-Weiß Oberhausen | Energie Cottbus | Free |
| 2026-07-10 | Travis de Jong | SC Paderborn 07 U23 | Rot-Weiß Oberhausen | Free |
| 2026-07-02 | Nils Winter | Alemannia Aachen | Rot-Weiß Oberhausen | Free |
| 2026-07-01 | Player | Borussia Mönchengladbach U21 | Rot-Weiß Oberhausen | Free |
| 2026-07-01 | Yannik Möker | Schöningen | Rot-Weiß Oberhausen | Free |
| 2026-07-01 | Player | Rot-Weiß Oberhausen | Wattenscheid 09 | Free |
| 2026-07-01 | Player | Rot-Weiß Oberhausen | Wattenscheid 09 | Free |
| 2026-07-01 | Hong Seok-Ju | Rot-Weiß Oberhausen | Patro Eisden | Free |
| 2026-01-08 | Christopher Schepp | Rot-Weiß Oberhausen | TSV Havelse | Free |
| 2026-01-01 | Player | Hertha BSC II | Rot-Weiß Oberhausen | Free |
| 2025-08-28 | Player | Rot-Weiß Oberhausen | Sprockhövel | Free |
| 2025-08-03 | Drew Murray | SC Freiburg | Rot-Weiß Oberhausen | Loan |
| 2025-07-29 | Hong Seok-Ju | Schalke 04 II | Rot-Weiß Oberhausen | Free |
| 2025-07-01 | Alexander Mühling | Sandhausen | Rot-Weiß Oberhausen | Free |
| 2025-07-01 | Christopher Schepp | SV Meppen | Rot-Weiß Oberhausen | Free |
| 2025-07-01 | Mustafa Kourouma | Rot-Weiss Essen | Rot-Weiß Oberhausen | Free |
| 2025-07-01 | Lucas Halangk | Hallescher FC | Rot-Weiß Oberhausen | Free |
| 2025-07-01 | Ayman Aourir | Eintracht Hohkeppel | Rot-Weiß Oberhausen | Free |