Hull U21: every transfer in and out, fees paid and earned, squad market value.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2023-09-01 | Bora Aydınlık | Fenerbahce U19 | Hull U21 | Loan |
| 2021-08-27 | Max Sheaf | Hull City U23 | Gloucester | Free |
| 2021-01-18 | Max Sheaf | Hull City U23 | Torquay | Loan |
| 2020-07-01 | Jacob Greaves | Hull City U23 | Hull City | — |
| 2020-07-01 | Callum Jones | Hull City U23 | Hull City | — |
| 2019-08-20 | Callum Jones | Bury FC U18 | Hull City U23 | — |
| 2019-08-08 | Jacob Greaves | Hull City U23 | Cheltenham | Loan |
| 2019-07-29 | Max Sheaf | Hull City U23 | Cheltenham | Loan |
| 2019-07-01 | Jacob Greaves | Hull U18 | Hull City U23 | — |
| 2018-07-01 | Max Sheaf | Hull U18 | Hull City U23 | — |
| 2016-07-01 | Jarrod Bowen | Hull City U23 | Hull City | — |
| 2014-07-08 | Jarrod Bowen | Hereford Utd. | Hull U21 | Free |