St. Mirren FC (Scottish Premiership): every transfer in and out, fees paid and earned, squad market value, €291k spent and €3.7m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-07-01 | Conor McMenamin | St. Mirren FC | Coleraine | Free |
| 2026-07-01 | Scott Tanser | St. Mirren | Falkirk | Free |
| 2026-07-01 | Oisin Smyth | St. Mirren | Partick Thistle | Free |
| 2026-07-01 | Luke Kenny | St. Mirren | Without Club | — |
| 2026-07-01 | James Scott | St. Mirren | Without Club | — |
| 2026-07-01 | Dan Nlundulu | St. Mirren | Without Club | — |
| 2026-04-23 | Ross Sinclair | St. Johnstone | St. Mirren | Loan |
| 2026-02-02 | Jacob Devaney | Man Utd U21 | St. Mirren | Loan |
| 2026-02-02 | Evan Mooney | St. Mirren | Arsenal U21 | €500k |
| 2026-01-29 | Fraser Taylor | St. Mirren | Partick Thistle | Loan |
| 2026-01-22 | Oisin Smyth | St. Mirren | Partick Thistle | Loan |
| 2026-01-21 | Kion Etete | Cardiff | St. Mirren | Loan |
| 2026-01-16 | Jake Young | Stevenage | St. Mirren | — |
| 2026-01-07 | Allan Campbell | Without Club | St. Mirren | — |
| 2025-09-13 | Billy Hutchinson | St. Mirren | Stirling Albion | Loan |
| 2025-09-12 | Billy Hutchinson | Clydebank FC | St. Mirren | Free |
| 2025-09-01 | Oisin Smyth | St. Mirren | Partick Thistle | Loan |
| 2025-09-01 | Dan Nlundulu | Bolton | St. Mirren | — |
| 2025-08-08 | James Scott | St. Mirren | Ross County | Loan |
| 2025-08-08 | Alex Iacovitti | St. Mirren | Ross County | Free |