JEF United (J1 League): every transfer in and out, fees paid and earned, squad market value.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2027-01-01 | Shunji Saito | JEF United U18 | JEF Utd. Chiba | — |
| 2026-02-01 | Takumi Matsumura | Takushoku Univ. | JEF Utd. Chiba | Free |
| 2026-02-01 | Makoto Himeno | JEF United U18 | JEF Utd. Chiba | — |
| 2026-01-12 | Takumi Tsukui | RB Omiya | JEF Utd. Chiba | — |
| 2026-01-12 | Taiki Amagasa | Oita Trinita | JEF Utd. Chiba | — |
| 2026-01-12 | Rikuto Ishio | Vegalta Sendai | JEF Utd. Chiba | — |
| 2025-08-19 | Takuya Yasui | JEF Utd. Chiba | FC Imabari | Loan |
| 2025-08-14 | Riku Matsuda | JEF Utd. Chiba | Tokyo Verdy | — |
| 2025-07-17 | Zain Issaka | Monte. Yamagata | JEF Utd. Chiba | — |
| 2025-06-05 | Hiiro Komori | JEF Utd. Chiba | Urawa Reds | — |
| 2025-02-27 | Carlinhos Junior | Shimizu S-Pulse | JEF Utd. Chiba | Free |
| 2025-02-06 | José Aurelio Suárez | Tokushima Vort. | JEF Utd. Chiba | Free |
| 2025-02-01 | Yuta Ueda | Kyoto Sanga | JEF Utd. Chiba | Loan |
| 2025-02-01 | Yuma Igari | Sanno Univ. | JEF Utd. Chiba | Free |
| 2025-02-01 | Tomoya Wakahara | Kyoto Sanga | JEF Utd. Chiba | — |
| 2025-02-01 | Takuro Iwai | Juntendo Univ. | JEF Utd. Chiba | Free |
| 2025-02-01 | Naohiro Sugiyama | Gamba Osaka | JEF Utd. Chiba | — |
| 2025-02-01 | Manato Shinada | FC Tokyo | JEF Utd. Chiba | — |
| 2025-02-01 | Haruto Usui | Matsumoto Yama. | JEF Utd. Chiba | Free |
| 2025-01-20 | Takuya Yasui | Machida Zelvia | JEF Utd. Chiba | — |