| DAVID FAWCETT (DESIGN) LIMITED | Other manufacturing | 1976 | Total exemption (full) |
| CLARENDON FOOD COMPANY LIMITED(THE) | Food products | 1980 | Total exemption (full) |
| ROWLANDS MARINE ELECTRONICS LIMITED | Repair and installation of machinery | 1982 | Total exemption (full) |
| HARBOUR MARINE ENGINEERING SERVICES LIMITED | Ships, aircraft, rail and other transport | 2002 | Unaudited abridged |
| NEFYN COACHES LIMITED | Repair and installation of machinery | 2005 | Total exemption (full) |
| LLYN MARINE SERVICES LIMITED | Repair and installation of machinery | 2008 | Total exemption (full) |
| MAKING LITTLE LIMITED | Fabricated metal products | 2010 | Total exemption (full) |
| CWRW LLYN CYF | Beverages | 2010 | Total exemption (full) |
| CERRIG GRANITE & SLATE LIMITED | Glass, ceramics, cement and stone | 2010 | Total exemption (full) |
| GREENEARTH HYDRO LIMITED | Repair and installation of machinery | 2010 | Total exemption (full) |