Fortuna Sittardia Combinatie (Eredivisie): every transfer in and out, fees paid and earned, squad market value, €5.5m spent and €12m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-07-01 | Paul Gladon | Fortuna Sittard | NAC Breda | Free |
| 2026-02-02 | Yassin Oukili | Casa Pia | Fortuna Sittard | — |
| 2026-01-21 | Houboulang Mendes | Fortuna Sittard | Servette FC | — |
| 2026-01-16 | Lance Duijvestijn | Sparta R. | Fortuna Sittard | Loan |
| 2026-01-14 | Ryan Fosso | Fortuna Sittard | Sturm Graz | €900k |
| 2026-01-13 | Marko Kerkez | Fortuna Sittard | Aris Saloniki | Free |
| 2026-01-09 | Makan Aïko | Fortuna Sittard | Tondela | — |
| 2026-01-06 | Neraysho Kasanwirjo | Feyenoord | Fortuna Sittard | Loan |
| 2025-08-27 | Loreintz Rosier | Fortuna Sittard | Al-Hazem | Free |
| 2025-08-14 | Mohamed Ihattaren | RKC Waalwijk | Fortuna Sittard | €100k |
| 2025-08-08 | Houboulang Mendes | UD Almería | Fortuna Sittard | Free |
| 2025-08-07 | Justin Lonwijk | Dynamo Kyiv | Fortuna Sittard | Loan |
| 2025-08-01 | Iván Márquez | 1.FC Nuremberg | Fortuna Sittard | — |
| 2025-07-31 | Rémy Vita | Fortuna Sittard | Tondela | — |
| 2025-07-30 | Marko Kerkez | Partizan | Fortuna Sittard | — |
| 2025-07-29 | Justin Hubner | Wolves U21 | Fortuna Sittard | Free |
| 2025-07-24 | Rodrigo Guth | Fortuna Sittard | CA Talleres | €1.3m |
| 2025-07-23 | Onur Demir | Fortuna Sittard | FC Petrzalka | Loan |
| 2025-07-17 | Alessio Da Cruz | Fortuna Sittard | Athletic | — |
| 2025-07-16 | Dimitrios Limnios | Panathinaikos | Fortuna Sittard | Loan |