Dumbarton (League Two): every transfer in and out, fees paid and earned, squad market value.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2025-08-05 | Kristian Webster | Rangers U21 | Dumbarton | Free |
| 2025-07-10 | Leighton McIntosh | Al Ahli | Dumbarton | Free |
| 2025-07-09 | Scott Honeyman | Falkirk FC | Dumbarton | Free |
| 2025-07-05 | Kalvin Orsi | Dumbarton | Alloa Athletic | Free |
| 2025-07-04 | Scott Tomlinson | Ayr United | Dumbarton | Loan |
| 2025-07-01 | Ally Roy | Stirling Albion | Dumbarton | Free |
| 2025-07-01 | Dominic Docherty | Clyde | Dumbarton | Free |
| 2025-07-01 | Adam Livingstone | East Kilbride | Dumbarton | Free |
| 2025-07-01 | Gordon Walker | East Fife | Dumbarton | Free |
| 2025-07-01 | Player | Ayr United | Dumbarton | Loan |
| 2025-07-01 | Craig McGuffie | Dumbarton | Peterhead | Free |
| 2025-07-01 | Joel Mumbongo | Dumbarton | Annan Athletic | Free |
| 2025-07-01 | James Hilton | Dumbarton | Clyde | Free |
| 2025-07-01 | Matthew Shiels | Dumbarton | Queen's Park | Free |
| 2025-07-01 | Michael Ruth | Dumbarton | Queen's Park | Free |
| 2025-07-01 | Carlo Pignatiello | Dumbarton | Queen's Park | Free |
| 2025-07-01 | Finlay Gray | Dumbarton | Stenhousemuir | Free |
| 2025-07-01 | Mouhamed Niang | Dumbarton | East Kilbride | Free |
| 2025-01-18 | Kristian Webster | Rangers U21 | Dumbarton | Loan |
| 2025-01-13 | Player | Falkirk FC | Dumbarton | Loan |