Arminia Bielefeld (Bundesliga): every transfer in and out, fees paid and earned, squad market value, €11m spent and €14m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-01-04 | Maximilian Bauer | Augsburg | Arm. Bielefeld | Loan |
| 2025-07-11 | Louis Oppie | Arm. Bielefeld | St. Pauli | €2m |
| 2025-07-09 | Florian Micheler | Hoffenheim | Arm. Bielefeld | Loan |
| 2025-07-02 | Jonathan Norbye | Leipzig | Arm. Bielefeld | Loan |
| 2025-07-01 | Benjamin Boakye | Stuttgart II | Arm. Bielefeld | €500k |
| 2024-07-01 | Joel Felix | Silkeborg IF | Arm. Bielefeld | Free |
| 2023-08-02 | Martin Fraisl | Arm. Bielefeld | FC Midtjylland | Free |
| 2023-07-14 | George Bello | Arm. Bielefeld | LASK | Free |
| 2023-07-13 | Burak İnce | Arm. Bielefeld | Slask Wroclaw | Free |
| 2023-07-05 | Masaya Okugawa | Arm. Bielefeld | Augsburg | Free |
| 2023-07-04 | Janni Serra | Arm. Bielefeld | Aarhus GF | Free |
| 2023-07-01 | Silvan Sidler | Arm. Bielefeld | FC Winterthur | Free |
| 2023-07-01 | Robin Hack | Arm. Bielefeld | Mönchengladbach | €1.1m |
| 2023-07-01 | Louis Oppie | Hannover 96 II | Arm. Bielefeld | Free |
| 2023-07-01 | Gui Ramos | Arm. Bielefeld | Hamburg | Free |
| 2023-07-01 | Andrés Andrade | Arm. Bielefeld | LASK | €500k |
| 2023-01-22 | Stefanos Kapino | Arm. Bielefeld | Miedz Legnica | Free |
| 2023-01-20 | Theo Corbeanu | Wolves U21 | Arm. Bielefeld | Loan |
| 2022-08-30 | Florian Krüger | Arm. Bielefeld | FC Groningen | €1.3m |
| 2022-08-24 | Martin Fraisl | FC Schalke 04 | Arm. Bielefeld | Free |