| SYSTEMS PIPEWORK LIMITED | Repair and installation of machinery | 1972 | Total exemption (full) |
| FAIRFIELD TOOL & DIE COMPANY (MAESTEG) LIMITED | Fabricated metal products | 1976 | Total exemption (full) |
| SIDERISE (SPECIAL PRODUCTS) LIMITED | Other manufacturing | 1982 | Small company accounts |
| SIDERISE INSULATION LIMITED | Other manufacturing | 1989 | Full accounts |
| TALGARTH BAKERY LIMITED | Food products | 1999 | Total exemption (full) |
| WELDSERV UK LTD | Repair and installation of machinery | 2007 | Total exemption (full) |
| ALLEN CHRISTOPHER WELDING LIMITED | Basic metals | 2008 | Unaudited abridged |
| IPL PLANT LTD | Repair and installation of machinery | 2010 | Total exemption (full) |