| WILLIAM PARTINGTON MARINE LIMITED | Repair and installation of machinery | 1958 | Total exemption (full) |
| DANLINE INTERNATIONAL LIMITED | Machinery and equipment | 1973 | Total exemption (full) |
| FIRMHELM LIMITED | Repair and installation of machinery | 1977 | Total exemption (full) |
| ANTUR WAUNFAWR | Beverages | 1984 | Small company accounts |
| G. L. JONES PLAYGROUNDS LTD. | Other manufacturing | 1987 | Total exemption (full) |
| PPM TECHNOLOGY LIMITED | Computers, electronics and optics | 1999 | Total exemption (full) |
| ARFON REWINDS LIMITED | Repair and installation of machinery | 2000 | Small company accounts |
| A.W. ENGINEERING (DARWEN) LIMITED | Repair and installation of machinery | 2002 | Total exemption (full) |
| P.R. THOMAS AGRICULTURE LIMITED | Repair and installation of machinery | 2003 | Total exemption (full) |
| TU MEWN CYFYNGEDIG | Textiles | 2005 | Total exemption (full) |
| GWYNEDD CASH REGISTERS LTD | Repair and installation of machinery | 2006 | Total exemption (full) |
| GENESIS UK.COM LIMITED | Textiles | 2006 | Total exemption (full) |
| HIGHRAIL SYSTEMS LIMITED | Computers, electronics and optics | 2006 | Total exemption (full) |