| Name | Company Number | Date Appointed | Rating |
|---|---|---|---|
| Bioinformatics Ltd | 01247941 | 18/10/1992 | Dissolved |
| D N A Probes Ltd | 01727829 | 14/10/1992 | Dissolved |
| International Medical Diagnostics Ltd | 01535653 | 14/10/1992 | Dissolved |
| Ipsen International Ltd | 01598872 | 28/02/2000 | Dissolved |
| L H Bioprocessing Ltd | 01765046 | 14/10/1992 | Dissolved |
| Molecular Biology Ltd | 01568792 | 18/10/1992 | Dissolved |
| Parthold Ltd | 00372085 | 14/10/1992 | Dissolved |
| Porton Capital Projects Ltd | 01895753 | 14/10/1992 | Dissolved |
| Porton Crawley Ltd | 01041879 | 14/10/1992 | Dissolved |
| Porton Developments Ltd | 01783826 | 14/10/1992 | Dissolved |
| Porton Research Ltd | 01800725 | 14/10/1992 | Dissolved |
| Speywood Communications Ltd | 01143723 | 18/10/1992 | Dissolved |
| Speywood Holdings Ltd | 02952498 | 11/01/2000 | Dissolved |
| Speywood Holdings Ltd | 02952498 | 03/08/2000 | Dissolved |
| The Speywood Laboratory Ltd | 01793168 | 14/10/1992 | Dissolved |
| alarbrook ltd | 01749065 | 14/10/1992 | Dissolved |
| Name | Company Number | Date Appointed | Date Resigned | Rating |
|---|---|---|---|---|
| Ipsen International Ltd | 01598872 | 28/02/2000 | 28/02/2000 | Dissolved |
| Porton Cambridge Ltd | 01680771 | 14/10/1992 | 12/05/1994 | Dissolved |