Brighton U21: every transfer in and out, fees paid and earned, squad market value, €6.5m spent and €4.7m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-01-31 | Joe Knight | Brighton U21 | Stevenage | — |
| 2025-09-01 | Jacob Slater | Brighton U21 | Harrogate Town | Loan |
| 2025-08-31 | Adrian Mazilu | Brighton U21 | FC Dinamo | €400k |
| 2025-07-07 | Mark O'Mahony | Brighton U21 | Reading | Loan |
| 2025-07-01 | Nils Ramming | E. Frankfurt II | Brighton U21 | €850k |
| 2025-07-01 | Killian Cahill | Brighton U21 | Leyton Orient | Free |
| 2025-07-01 | James Beadle | Brighton U21 | Brighton | — |
| 2025-07-01 | Andrew Moran | Brighton U21 | Brighton | — |
| 2025-02-03 | Ruairi McConville | Brighton U21 | Norwich | €3m |
| 2025-02-03 | Ed Turns | Brighton U21 | Exeter City | — |
| 2025-01-31 | Cameron Peupion | Brighton U21 | ADO Den Haag | — |
| 2025-01-13 | Imari Samuels | Brighton U21 | Dundee FC | — |
| 2024-08-28 | Mark O'Mahony | Brighton U21 | Portsmouth | Loan |
| 2024-08-16 | Andrew Moran | Brighton U21 | Stoke City | Loan |
| 2024-07-08 | Ben Jackson | Brighton U21 | Livingston FC | Loan |
| 2024-07-04 | James Beadle | Brighton U21 | Sheff Wed | Loan |
| 2024-07-01 | Odeluga Offiah | Brighton U21 | Brighton | — |
| 2024-07-01 | Leigh Kavanagh | Brighton U21 | Bohemians | Free |
| 2024-07-01 | Joe Knight | Brighton U18 | Brighton U21 | — |
| 2024-07-01 | Jack Hinchy | Brighton U21 | Without Club | — |