Jeju SK Football Club (K League 1): every transfer in and out, fees paid and earned, squad market value, €2m spent and €3.5m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-08-03 | Jun-ha Kim | Jeju SK | Gimcheon Sangmu | Loan |
| 2026-08-03 | Jae-hyeok Oh | Jeju SK | Gimcheon Sangmu | Loan |
| 2026-08-03 | Chan-gi An | Jeju SK | Gimcheon Sangmu | Loan |
| 2026-03-17 | Tobias Figueiredo | Fortaleza | Jeju SK | Free |
| 2026-01-23 | Julien Célestine | Arka Gdynia | Jeju SK | Free |
| 2026-01-16 | Tae-hyun An | Jeju SK | Bucheon FC | Free |
| 2026-01-16 | Shin-jin Kim | Gangwon FC | Jeju SK | — |
| 2026-01-16 | Seung-sub Kim | Jeju SK | Jeonbuk Hyundai | — |
| 2026-01-16 | Seung-jae Yoo | Y. Taesung U18 | Jeju SK | Free |
| 2026-01-16 | Min-jae Park | Yonsei Univ. | Jeju SK | Free |
| 2026-01-16 | Jae-won Heo | Jeju SK U18 | Jeju SK | — |
| 2026-01-16 | Gytis Paulauskas | Michalovce | Jeju SK | €300k |
| 2026-01-16 | Emerson Negueba | Cuiabá-MT | Jeju SK | — |
| 2026-01-16 | Dong-hwi Kang | Y. Taesung U18 | Jeju SK | Free |
| 2026-01-16 | Chang-jun Park | Bucheon FC | Jeju SK | Free |
| 2026-01-16 | Chang-hoon Kwon | Jeonbuk Hyundai | Jeju SK | Free |
| 2026-01-01 | Gi-min Kwon | Dongguk Uni | Jeju SK | — |
| 2025-07-15 | Pedrinho | Seoul E-Land | Jeju SK | Loan |
| 2025-07-04 | Geon-ung Kim | Jeju SK | Incheon Utd. | Loan |
| 2025-06-17 | Sang-eun Shin | Daejeon Hana C. | Jeju SK | — |