RKU: every transfer in and out, fees paid and earned, squad market value.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-02-01 | Sota Matsunaga | RKU | Urawa Reds | Free |
| 2026-02-01 | Keigo Suzuki | RKU | Shimizu S-Pulse | Free |
| 2025-02-01 | Kenta Nemoto | RKU | Urawa Reds | Free |
| 2025-02-01 | Kaito Fujii | RKU | Fagiano Okayama | Free |
| 2022-04-01 | Sota Matsunaga | Shizugaku HS | RKU | Free |
| 2022-04-01 | Keigo Suzuki | S-Pulse U18 | RKU | Free |
| 2022-02-01 | Yuta Miyamoto | RKU | Urawa Reds | Free |
| 2022-02-01 | Taishi Semba | RKU | Sanf. Hiroshima | Free |
| 2022-02-01 | Taichi Kikuchi | RKU | Sagan Tosu | Free |
| 2022-02-01 | Makoto Mitsuta | RKU | Sanf. Hiroshima | Free |
| 2022-02-01 | Kyo Sato | RKU | Sagan Tosu | Free |
| 2022-02-01 | Kaito Yasui | RKU | Urawa Reds | Free |
| 2022-02-01 | Haruto Usui | RKU | Matsumoto Yama. | Free |
| 2022-02-01 | Asahi Sasaki | RKU | Kawasaki Front. | Free |
| 2021-06-01 | Kenta Nemoto | RKU | RKU FC | Loan |
| 2021-04-01 | Kenta Nemoto | High School (J) | RKU | Free |
| 2021-04-01 | Kaito Fujii | RKU Kashiwa HS | RKU | — |
| 2021-02-01 | Hisashi Appiah Tawiah | RKU | Vegalta Sendai | Free |
| 2021-02-01 | Chihiro Kato | RKU | Vegalta Sendai | Free |
| 2021-02-01 | Atsuki Ito | RKU | Urawa Reds | Free |