| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| BRADFIELD INTERNATIONAL LIMITED | 10769507 | 18/04/2024 | Not Trading |
| CORBETT CLARKE LIMITED | 08447091 | 15/03/2013 | One Red Flag |
| HR WALLINGFORD INSTRUMENTATION LTD | 12323004 | 19/11/2019 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| AIRTO LIMITED | 01217006 | 25/04/2019 | 01/11/2023 | Silver |
| AQUAWARE SYSTEMS LIMITED | 02994197 | 18/11/2022 | 31/10/2023 | Not Trading |
| DREDGING RESEARCH LIMITED | 02411742 | 18/11/2022 | 31/10/2023 | Not Trading |
| DRL SOFTWARE LIMITED | 03100147 | 18/11/2022 | 31/10/2023 | Not Trading |
| HR MARDYN LIMITED | 02712932 | 18/11/2022 | 31/10/2023 | Not Trading |
| HR WALLINGFORD CORETECX LIMITED | 15163436 | 25/09/2023 | 31/10/2023 | Bronze |
| HYDRAULICS RESEARCH LIMITED | 02784751 | 18/11/2022 | 31/10/2023 | Not Trading |
| SEAZONE SOLUTIONS LIMITED | 04969561 | 18/11/2022 | 31/10/2023 | Not Trading |
| SOCIETY OF MARITIME INDUSTRIES LIMITED | 00883132 | 04/10/2018 | 12/10/2023 | Bronze |
| WALLINGFORD LIMITED | 02959991 | 18/11/2022 | 31/10/2023 | Not Trading |
| WALLINGFORD SYSTEMS LIMITED | 02288719 | 18/11/2022 | 31/10/2023 | Not Trading |
| WALLINGFORD WATER LIMITED | 02288238 | 18/11/2022 | 31/10/2023 | Not Trading |