Stade Brestois 29 (Ligue 1): every transfer in and out, fees paid and earned, squad market value, €52m spent and €74m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-01-21 | Raphaël Le Guen | Brest B | Stade Brestois | — |
| 2026-01-20 | Justin Bourgault | Stade Brestois | AS Nancy | Loan |
| 2025-10-04 | Soumaïla Coulibaly | R. Strasbourg | Stade Brestois | Loan |
| 2025-09-01 | Lucas Tousart | Union Berlin | Stade Brestois | — |
| 2025-09-01 | Junior Dina Ebimbe | Frankfurt | Stade Brestois | Loan |
| 2025-08-31 | Rémy Labeau Lascary | Lens | Stade Brestois | Loan |
| 2025-08-31 | Pathé Mboup | Pau FC | Stade Brestois | €1.7m |
| 2025-08-28 | Pierre Lees-Melou | Stade Brestois | Paris FC | €5.8m |
| 2025-08-26 | Daouda Guindo | Salzburg | Stade Brestois | Free |
| 2025-08-23 | Joris Chotard | Montpellier | Stade Brestois | €2.4m |
| 2025-08-13 | Mahdi Camara | Stade Brestois | Stade Rennais | €8m |
| 2025-08-09 | Radoslaw Majecki | Monaco | Stade Brestois | Loan |
| 2025-07-15 | Marco Bizot | Stade Brestois | Aston Villa | €500k |
| 2025-07-13 | Junior Diaz | Troyes | Stade Brestois | Loan |
| 2025-07-03 | Massadio Haïdara | Stade Brestois | Kocaelispor | Free |
| 2025-07-01 | Saliou Diop | Brest B | Stade Brestois | — |
| 2025-07-01 | Mathias Pereira Lage | Stade Brestois | St. Pauli | Free |
| 2025-07-01 | Ludovic Ajorque | Mainz | Stade Brestois | €2m |
| 2025-07-01 | Lilian Brassier | Stade Brestois | Stade Rennais | €12m |
| 2025-07-01 | Jonas Martin | Stade Brestois | Without Club | — |