| VASEY THOMPSON LIMITED | Printing and recorded media | 1974 | Total exemption (full) |
| P.C. HENDERSON LIMITED | Fabricated metal products | 1974 | Full accounts |
| D.J.H. (GROUP) LIMITED | Fabricated metal products | 1982 | Audit-exempt subsidiary |
| J.G. PAXTON AND SONS LIMITED | Repair and installation of machinery | 1983 | Full accounts |
| TOTAL GRAPHIC SUPPLIES LIMITED | Chemicals | 1986 | Total exemption (full) |
| RICHARDSON DESIGNS LIMITED | Other manufacturing | 1986 | Total exemption (full) |
| HIGH FORCE RESEARCH LIMITED | Chemicals | 1988 | Total exemption (full) |
| LANCHESTER DAIRIES LIMITED | Food products | 1994 | Full accounts |
| NORTH EAST ASSEMBLIES LIMITED | Fabricated metal products | 1995 | Total exemption (full) |
| TAYLOR'S BAKERY LIMITED | Food products | 1995 | Total exemption (full) |
| SAFERAD LIMITED | Computers, electronics and optics | 1996 | Total exemption (full) |
| THE DURHAM BREWERY LIMITED | Beverages | 1997 | Total exemption (full) |
| TYNEDALE ROADSTONE LIMITED | Other manufacturing | 1999 | Full accounts |
| FOSTER CLARK ENGINEERING LIMITED | Repair and installation of machinery | 1999 | Total exemption (full) |
| CRANEX LIMITED | Repair and installation of machinery | 2000 | Unaudited abridged |
| DFP SERVICES LIMITED | Repair and installation of machinery | 2000 | Unaudited abridged |
| LITTLE NEWSHAM FORGE LIMITED | Fabricated metal products | 2001 | Unaudited abridged |
| MARBLE ARTS TM LIMITED | Glass, ceramics, cement and stone | 2001 | Total exemption (full) |
| T.Q.K. LIMITED | Furniture | 2002 | Total exemption (full) |
| DURHAM FOODS LIMITED | Food products | 2003 | Total exemption (full) |
| CONDUIT CONSTRUCTION NETWORK LIMITED | Wood products | 2005 | Unaudited abridged |
| MIKE KELLY JOINERY LIMITED | Wood products | 2005 | Total exemption (full) |
| STEVEN GREGORY DESIGNS LIMITED | Other manufacturing | 2007 | Total exemption (full) |
| M5 AUTOMATION LIMITED | Electrical equipment | 2007 | Total exemption (full) |
| CAR-TECH PRESTIGE LIMITED | Repair and installation of machinery | 2007 | Total exemption (full) |
| DECON INDUSTRIES LIMITED | Fabricated metal products | 2008 | Total exemption (full) |
| CHAPTER ENGINEERING LIMITED | Machinery and equipment | 2009 | Total exemption (full) |
| SAPIENT SENSORS LIMITED | Computers, electronics and optics | 2010 | Total exemption (full) |