Colchester Utd.: every transfer in and out, fees paid and earned, squad market value and €1.2m earned.
| Date | Player | From | To | Fee |
|---|---|---|---|---|
| 2026-02-02 | Romeo Akachukwu | Southampton U21 | Colchester Utd. | Loan |
| 2025-07-09 | Ben Perry | Nottingham U21 | Colchester Utd. | — |
| 2024-08-30 | Jamie McDonnell | Nottingham U21 | Colchester Utd. | Loan |
| 2024-08-28 | Aaron Donnelly | Nottingham U21 | Colchester Utd. | Loan |
| 2024-07-31 | Noah Chilvers | Colchester Utd. | Ross County | — |
| 2024-07-01 | John-Kymani Gordon | Palace U21 | Colchester Utd. | Free |
| 2024-01-23 | Riley Harbottle | Hibernian FC | Colchester Utd. | Loan |
| 2024-01-12 | Jayden Richardson | Aberdeen FC | Colchester Utd. | Loan |
| 2024-01-03 | Conor Wilkinson | Motherwell FC | Colchester Utd. | — |
| 2023-09-01 | Zach Mitchell | Charlton | Colchester Utd. | Loan |
| 2023-08-05 | Joe Taylor | Luton | Colchester Utd. | Loan |
| 2023-07-28 | Tommy Smith | Colchester Utd. | MK Dons | Free |
| 2023-07-18 | Mauro Bandeira | Arsenal U21 | Colchester Utd. | Loan |
| 2023-07-14 | Owen Goodman | Palace U21 | Colchester Utd. | Loan |
| 2023-07-11 | Kieran O'Hara | Colchester Utd. | Kilmarnock FC | Free |
| 2022-09-01 | Matty Longstaff | Newcastle | Colchester Utd. | Loan |
| 2022-08-26 | Dan Chesters | West Ham U21 | Colchester Utd. | Loan |
| 2022-08-03 | Kieran O'Hara | Fleetwood | Colchester Utd. | Free |
| 2022-07-23 | Shamal George | Colchester Utd. | Livingston FC | — |
| 2022-07-01 | Miles Welch-Hayes | Colchester Utd. | Harrogate Town | Free |