Glentoran (Premiership): every transfer in and out, fees paid and earned, squad market value, €168k spent.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-07-24 | Lorcan Donnelly | Glentoran | Glenavon | Loan |
| 2026-07-09 | Zeno Ibsen Rossi | Cambridge United | Glentoran | Free |
| 2026-07-02 | Dylan Connolly | Glentoran | Galway United | Free |
| 2026-07-01 | Ciaran Coll | Glentoran | Strabane Athletic | Free |
| 2026-07-01 | Cammy Palmer | Glentoran | Livingston FC | Free |
| 2026-07-01 | Aaron Wightman | Glentoran | Cliftonville | Free |
| 2026-07-01 | Daniel Amos | Glentoran | Barrow | Free |
| 2026-02-02 | Joshua Daniels | The New Saints | Glentoran | Free |
| 2026-01-25 | Aaron McEneff | Shamrock Rovers | Glentoran | Free |
| 2026-01-25 | David Fisher | Glentoran | Hà Nội | Free |
| 2026-01-22 | Jarlath O'Rourke | Crusaders | Glentoran | Free |
| 2026-01-22 | Ross Clarke | Crusaders | Glentoran | Free |
| 2026-01-19 | Shane McEleney | Glentoran | Ballymena United | Free |
| 2026-01-13 | Frankie Hvid | Glentoran | Kustošija | Free |
| 2026-01-06 | Jack Malone | Glenavon | Glentoran | Free |
| 2026-01-06 | Nathaniel Ferris | Glentoran | Glenavon | Loan |
| 2026-01-06 | Jason Lindsay | Glentoran | Glenavon | Loan |
| 2026-01-03 | Johnny Russell | Glentoran | Crawley Town | Free |
| 2025-09-01 | Aaron Wightman | Glentoran | Portadown | Loan |
| 2025-08-03 | Player | Glentoran | Moyola Park | Free |