Seongnam (K League 2): every transfer in and out, fees paid and earned, squad market value, €807k spent and €925k earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-03-26 | Seong-uk Jin | Seongnam | Gyeongju HNP | Free |
| 2026-01-16 | Min-ho Yun | Busan I'Park | Seongnam | Free |
| 2026-01-16 | Kwang-yeon Lee | Gangwon Football Club | Seongnam | Free |
| 2026-01-16 | Paul Villero | Ponte Preta | Seongnam | Loan |
| 2026-01-16 | Leonardo Ruiz | Seongnam | Football Club Seoul | Free |
| 2026-01-16 | Han-been Yang | Seongnam | Suwon FC | Free |
| 2026-01-16 | Joo-won Kim | Seongnam | Daegu FC | Free |
| 2026-01-16 | Jae-won Shin | Seongnam | Bucheon 1995 | Free |
| 2026-01-16 | Si-hoo Yang | Seongnam | Hwaseong | Free |
| 2026-01-16 | Eui-bin Kang | Seongnam | Cheongju | Free |
| 2026-01-16 | Jang Young-Ki | Seongnam | Changwon City | Loan |
| 2025-07-24 | Kuk Kwan-Woo | Seongnam | Gyeongju HNP | Loan |
| 2025-07-23 | Sang-hyeok Park | Suwon Bluewings | Seongnam | Free |
| 2025-07-18 | Ji-won Park | Seongnam | Suwon Bluewings | Free |
| 2025-07-03 | Won-jin Jeong | Seongnam | Incheon United Football Club | Free |
| 2025-07-01 | Leandro Ribeiro | Jeonnam Dragons | Seongnam | Free |
| 2025-06-25 | Elionay | Hamrun Spartans | Seongnam | Loan |
| 2025-06-04 | Jae-wook Lee | Ulsan HD | Seongnam | Free |
| 2025-06-02 | Han-been Yang | Sagan Tosu | Seongnam | Free |
| 2025-03-27 | Kun-Il Kim | Seongnam | Yeoju Sejong | Free |