B. Dortmund II: every transfer in and out, fees paid and earned, squad market value, €525k spent and €8.9m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-07-01 | Samuele Inácio | B. Dortmund II | Dortmund | — |
| 2026-01-03 | Jordi Paulina | B. Dortmund II | F. Düsseldorf | €350k |
| 2026-01-03 | Antonio Foti | B. Dortmund II | SC Verl | — |
| 2026-01-01 | Samuele Inácio | B. Dortmund U19 | B. Dortmund II | — |
| 2026-01-01 | Mathis Albert | B. Dortmund U19 | B. Dortmund II | — |
| 2026-01-01 | Elias Benkara | B. Dortmund U19 | B. Dortmund II | — |
| 2026-01-01 | David Lelle | B. Dortmund II | Aris Limassol | — |
| 2025-09-01 | Yannik Lührs | B. Dortmund II | Hoffenheim II | €400k |
| 2025-07-30 | Rodney Elongo-Yombo | B. Dortmund II | Saarbrücken | Free |
| 2025-07-16 | Tyler Meiser | B. Dortmund II | M'gladbach II | — |
| 2025-07-14 | Baran Moğultay | B. Dortmund II | Alanyaspor | Loan |
| 2025-07-01 | Tyler Meiser | B. Dortmund U19 | B. Dortmund II | — |
| 2025-07-01 | Niklas Jessen | B. Dortmund II | MSV Duisburg | — |
| 2025-01-06 | Filippo Mane | B. Dortmund II | Dortmund | — |
| 2025-01-04 | Silas Ostrzinski | B. Dortmund II | Dortmund | — |
| 2024-07-11 | Bjarne Pudel | B. Dortmund II | Aalborg BK | Free |
| 2024-07-01 | Yannik Lührs | Hannover 96 | B. Dortmund II | €350k |
| 2024-07-01 | Samuel Bamba | B. Dortmund II | VfL Bochum | Free |
| 2024-07-01 | Niklas Jessen | St. Pauli II | B. Dortmund II | — |
| 2024-07-01 | Jordi Paulina | Hercules | B. Dortmund II | Free |