RB Omiya: every transfer in and out, fees paid and earned, squad market value, €443k spent and €2.3m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-01-31 | Rion Ichihara | RB Omiya | AZ Alkmaar | — |
| 2026-01-12 | Takumi Tsukui | RB Omiya | JEF Utd. Chiba | — |
| 2026-01-01 | Tom Glover | Without Club | RB Omiya | — |
| 2025-06-10 | Takumi Tsukui | Mito HollyHock | RB Omiya | — |
| 2025-02-01 | Yuya Tsuboi | Vissel Kobe | RB Omiya | Loan |
| 2024-02-01 | Yuta Ueda | Kyoto Sanga | Omiya Ardija | Loan |
| 2024-02-01 | Rion Ichihara | Omiya U18 | Omiya Ardija | — |
| 2023-07-28 | Masaya Shibayama | Omiya Ardija | Cerezo Osaka | — |
| 2023-07-17 | Takahiro Iida | Kyoto Sanga | Omiya Ardija | Loan |
| 2023-07-01 | Kanji Okunuki | Omiya Ardija | 1.FC Nuremberg | €300k |
| 2023-02-01 | Rio Omori | FC Tokyo | Omiya Ardija | Loan |
| 2023-01-09 | Masahito Ono | Omiya Ardija | Monte. Yamagata | — |
| 2022-08-31 | Kanji Okunuki | Omiya Ardija | Górnik Zabrze | Loan |
| 2022-01-09 | Kazuki Kushibiki | Omiya Ardija | V-V. Nagasaki | Free |
| 2022-01-09 | Hijiri Onaga | Omiya Ardija | Machida Zelvia | — |
| 2022-01-09 | Akinari Kawazura | Omiya Ardija | Nagoya Grampus | Free |
| 2021-02-01 | Riku Yamada | Omiya Ardija | Ventforet Kofu | — |
| 2021-02-01 | Masaya Shibayama | Omiya U18 | Omiya Ardija | — |
| 2021-01-09 | Kazuki Kushibiki | Sanf. Hiroshima | Omiya Ardija | Free |
| 2020-07-08 | Kenta Matsumoto | Kashiwa Reysol | Omiya Ardija | Loan |