Ulsan HD U18: every transfer in and out, fees paid and earned, squad market value.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-01-16 | Ju-ho Choi | Ulsan HD U18 | Ulsan HD | — |
| 2024-01-01 | Won-woo Cho | Ulsan HD U18 | Honam Uni | — |
| 2024-01-01 | Ju-ho Choi | Ulsan HD U15 | Ulsan HD U18 | — |
| 2023-01-01 | Seong-min Ryu | Ulsan H. U18 | Chung-Ang Uni | — |
| 2023-01-01 | Jae-hyeon Kim | Ulsan H. U18 | Daegu Arts Uni | — |
| 2023-01-01 | Hyeon-seo Han | Ulsan H. U18 | Daegu Arts Uni | — |
| 2023-01-01 | Do-hyun Kim | Ulsan H. U18 | Ulsan Hyundai | — |
| 2022-01-01 | Yong-jun Hong | Ulsan H. U18 | Myongji Uni | — |
| 2022-01-01 | Seok-hyeon Choi | Ulsan H. U18 | Dankook Univ | — |
| 2021-01-01 | Won-woo Cho | Baekma MS | Ulsan H. U18 | — |
| 2021-01-01 | Si-young Jang | Ulsan H. U18 | Yonsei Univ. | — |
| 2021-01-01 | Ji-ho Lee | Ulsan H. U18 | Korea University | — |
| 2021-01-01 | Jae-won Lee | Ulsan H. U18 | Ulsan Univ. | — |
| 2020-01-01 | Seong-min Ryu | Songsan FC U15 | Ulsan H. U18 | — |
| 2020-01-01 | Sang-hyeok Lee | Ulsan H. U18 | Dankook Univ | — |
| 2020-01-01 | Jae-joon An | Ulsan H. U18 | Ulsan Hyundai | — |
| 2020-01-01 | Jae-hyeon Kim | Ulsan H. U15 | Ulsan H. U18 | — |
| 2020-01-01 | Hyeon-seo Han | Sejong SKK U15 | Ulsan H. U18 | — |
| 2020-01-01 | Do-hyun Kim | Ulsan H. U15 | Ulsan H. U18 | — |
| 2019-12-31 | Jae-hwan Hwang | Ulsan H. U18 | Ulsan Hyundai | — |