Seongnam FC: every transfer in and out, fees paid and earned, squad market value, €2.1m spent and €3.6m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-01-16 | Sung-wook Jo | Seongnam FC | Pohang Steelers | — |
| 2026-01-16 | Leonardo Ruiz | Seongnam FC | FC Seoul | Free |
| 2026-01-16 | Jae-won Shin | Seongnam FC | Bucheon FC | — |
| 2025-07-03 | Won-jin Jung | Seongnam FC | Incheon Utd. | — |
| 2025-03-18 | Sung-wook Jo | Seongnam FC | Pohang Steelers | Loan |
| 2024-03-08 | Leonardo Ruiz | Rio Ave | Seongnam FC | — |
| 2024-01-05 | Jae-hyeok Oh | Jeonbuk Hyundai | Seongnam FC | Loan |
| 2024-01-04 | Won-jin Jung | Busan IPark | Seongnam FC | Free |
| 2024-01-04 | Tae-joon Park | Seongnam FC | Gwangju FC | Free |
| 2023-07-01 | Ji-soo Kim | Seongnam FC | Brentford B | €640k |
| 2023-01-13 | Jae-won Shin | Suwon FC | Seongnam FC | Free |
| 2023-01-01 | Soo-il Park | Seongnam FC | FC Seoul | — |
| 2023-01-01 | Je-woon Yeon | Seongnam FC | Jeju United | — |
| 2023-01-01 | In-soo Yu | Seongnam FC | Gangwon FC | — |
| 2023-01-01 | Han-min Jung | FC Seoul | Seongnam FC | Loan |
| 2022-12-21 | Jae-woo Kang | Seongnam FC | Bucheon FC | — |
| 2022-02-07 | Ji-soo Kim | Seongnam FC U18 | Seongnam FC | — |
| 2022-01-11 | Tae-joon Park | Seongnam FC | Seoul E-Land | Loan |
| 2022-01-09 | Kyung-won Kwon | Seongnam FC | Gamba Osaka | Free |
| 2022-01-08 | Seung-min Um | Jeonbuk Hyundai | Seongnam FC | Loan |