US Boulogne: every transfer in and out, fees paid and earned, squad market value and €3.8m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-07-20 | Amine El Farissi | US Boulogne | MAS Fès | Free |
| 2026-07-08 | Amine El Farissi | US Boulogne | MAS Fès | Free |
| 2026-02-14 | Hervé Touré | US Boulogne | Javor-Matis | Loan |
| 2025-11-01 | Vincent Burlet | Lille | US Boulogne | Loan |
| 2025-09-14 | Jonas Martin | Without Club | US Boulogne | — |
| 2025-07-01 | Théo Epailly | US Boulogne | La Louvière | Free |
| 2024-07-29 | Yannick Pandor | Lens | US Boulogne | Loan |
| 2024-01-30 | Théo Epailly | AF Virois | US Boulogne | Free |
| 2022-12-24 | Adam Abeddou | USL Dunkerque | US Boulogne | Loan |
| 2022-07-01 | Hervé Touré | Boulogne B | US Boulogne | — |
| 2022-02-01 | Antoine Hainaut | Parma | US Boulogne | Loan |
| 2022-01-31 | Antoine Hainaut | US Boulogne | Parma | €300k |
| 2022-01-30 | Anthony Oyono | US Boulogne | Frosinone | — |
| 2021-11-13 | Teddy Okou | US Boulogne | Without Club | — |
| 2021-08-31 | Leroy Abanda | AC Milan | US Boulogne | Loan |
| 2021-07-01 | Noah Cadiou | US Boulogne | Red Star FC | Free |
| 2021-07-01 | Antoine Hainaut | Boulogne B | US Boulogne | — |
| 2021-02-01 | Oussama Abdeldjelil | USM Alger | US Boulogne | Free |
| 2020-10-04 | Teddy Okou | LOSC Lille B | US Boulogne | Free |
| 2020-07-01 | Anthony Oyono | Boulogne B | US Boulogne | — |