| Manufacturer | Sector | Year | Accounts type |
|---|---|---|---|
| LOCKHEED MARTIN UK AMPTHILL LIMITED | Ships, aircraft, rail and other transport | 1957 | Full accounts |
| WATSON & BROOKMAN (ENGINEERS) LIMITED | Fabricated metal products | 1978 | Total exemption (full) |
| MAGSTRIPE LIMITED | Computers, electronics and optics | 1990 | Total exemption (full) |
| DESIGN FINISHING LIMITED | Other manufacturing | 2004 | Total exemption (full) |
| R.G. ELECTRICAL SERVICES LIMITED | Repair and installation of machinery | 2006 | Total exemption (full) |