Sion II (1.Liga Promotion): every transfer in and out, fees paid and earned, squad market value and €8.5m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2025-09-01 | Alessandro Nisci | Juventus FC | Sion II | Free |
| 2025-08-12 | Ruben Londja | Le Havre AC | Sion II | Free |
| 2025-07-28 | Player | Sion II | Martigny Sports | Free |
| 2025-07-22 | Noah Godwin | Sion II | Bellinzona | Loan |
| 2025-07-16 | Itaitinga | Sion II | Etoile Carouge | Free |
| 2025-07-15 | Noah Ato-Zandanga | Sion II | FC Wil 1900 | Free |
| 2025-07-01 | Hervé Matondo | FC Sion | Sion II | Free |
| 2025-07-01 | Rayan Stoll | Sion II | FC Sion | Free |
| 2025-04-01 | Itaitinga | TBC | Sion II | Free |
| 2024-07-29 | Player | Sion II | Monthey | Loan |
| 2024-07-01 | Player | Sion II | Retired | Free |
| 2024-07-01 | Alexandre Nsakala | Sion II | Grand-Saconnex | Free |
| 2024-07-01 | Noah Grognuz | Sion II | FC Sion | Free |
| 2024-07-01 | Dylan Tutonda | Sion II | FC Sion | Free |
| 2024-07-01 | Yohan Aymon | Sion II | FC Sion | Free |
| 2024-07-01 | Pierrick Moulin | Sion II | FC Sion | Free |
| 2024-02-21 | Dylan Tutonda | Bulle | Sion II | Free |
| 2023-07-01 | Nicky Clescenco | Sion II | Petrocub | Free |
| 2023-07-01 | Player | FC Sion | Sion II | Free |
| 2023-07-01 | Hervé Matondo | Sion II | FC Sion | Free |