| JOHNSON MATTHEY PLC | Chemicals | 1891 | Group accounts |
| WALTERS AND WALTERS LIMITED | Other manufacturing | 1955 | Total exemption (full) |
| GRANT INSTRUMENTS (CAMBRIDGE) LIMITED | Computers, electronics and optics | 1960 | Group accounts |
| R.K. PRINT-COAT INSTRUMENTS LIMITED | Computers, electronics and optics | 1963 | Total exemption (full) |
| EDINBURGH INSTRUMENTS LIMITED | Computers, electronics and optics | 1969 | Full accounts |
| EAGLE CONTROLS INTERNATIONAL LIMITED | Computers, electronics and optics | 1974 | Total exemption (full) |
| A.V. ENGINEERING SERVICES LIMITED | Rubber and plastics | 1975 | Total exemption (full) |
| MELDFORM PROCESSING LIMITED | Basic metals | 1981 | Total exemption (full) |
| JR TECHNOLOGY LIMITED | Other manufacturing | 1983 | Total exemption (full) |
| BIOX LIMITED | Chemicals | 1984 | Total exemption (full) |
| ELTEK LIMITED | Computers, electronics and optics | 1985 | Total exemption (full) |
| ORIGIN NORTHERN IRELAND LIMITED | Other manufacturing | 1985 | Full accounts |
| NAYLORS TIMBER RECOVERY LIMITED | Wood products | 1988 | Total exemption (full) |
| ION SCIENCE LIMITED | Computers, electronics and optics | 1989 | Full accounts |
| METAL MATE (BIGGLESWADE) LIMITED | Fabricated metal products | 1989 | Unaudited abridged |
| ORIGIN UK OPERATIONS LIMITED | Chemicals | 1990 | Full accounts |
| VOLAC INTERNATIONAL LIMITED | Food products | 1991 | Group accounts |
| HOTEL CHOCOLAT LIMITED | Food products | 1993 | Audit-exempt subsidiary |
| THE AUTOMATION PARTNERSHIP (CAMBRIDGE) LIMITED | Other manufacturing | 1993 | Full accounts |
| COBCRETE LIMITED | Glass, ceramics, cement and stone | 1994 | Total exemption (full) |
| ANALOX LIMITED | Other manufacturing | 1994 | Full accounts |
| AUTAJON LABELS ROYSTON ENGLAND LIMITED | Printing and recorded media | 1995 | Full accounts |
| LINE MARK (UK) LIMITED | Chemicals | 1995 | Full accounts |
| THE SWEET PEOPLE LIMITED | Food products | 1998 | Unaudited abridged |
| CUDA LIMITED | Other manufacturing | 1998 | Total exemption (full) |
| TAP BIOSYSTEMS GROUP LIMITED | Machinery and equipment | 1998 | Full accounts |
| JOHNSON MATTHEY PRECIOUS METALS LIMITED | Basic metals | 1998 | Full accounts |
| PFYLORI LIMITED | Pharmaceuticals | 1999 | Total exemption (full) |
| GLASS SOLUTIONS LTD | Glass, ceramics, cement and stone | 2000 | Total exemption (full) |
| WIREWELL ELECTRONIC SERVICES LIMITED | Electrical equipment | 2000 | Total exemption (full) |
| AUTOGATE SERVICES AND INSTALLATION LTD. | Repair and installation of machinery | 2000 | Total exemption (full) |
| METTLER-TOLEDO SAFELINE X-RAY LIMITED | Machinery and equipment | 2000 | Full accounts |
| MAYBREY PRECISION CASTINGS LIMITED | Basic metals | 2001 | Unaudited abridged |
| JOHNSON MATTHEY HYDROGEN TECHNOLOGIES LIMITED | Electrical equipment | 2002 | Full accounts |
| ORIGIN GREENTECH LIMITED | Food products | 2002 | Full accounts |
| KAIZEN TECHNOLOGY LTD | Electrical equipment | 2002 | Total exemption (full) |
| FOULGER'S (CVS) LIMITED | Repair and installation of machinery | 2003 | Total exemption (full) |
| TOUCH OF GINGER LIMITED | Other manufacturing | 2003 | Total exemption (full) |
| J JEFFREY & SON LIMITED | Repair and installation of machinery | 2003 | Total exemption (full) |
| PLASTIC TURNED PARTS LIMITED | Fabricated metal products | 2004 | Total exemption (full) |
| WHITE SPACE CREATIVE LTD | Other manufacturing | 2004 | Total exemption (full) |
| THE DOLOMITE CENTRE LIMITED | Machinery and equipment | 2005 | Audit-exempt subsidiary |
| PROAMPAC SECURITY PRODUCTS LIMITED | Rubber and plastics | 2006 | Full accounts |
| ESSEN BIOSCIENCE LIMITED | Machinery and equipment | 2007 | Full accounts |
| ADWS GLOBAL LIMITED | Machinery and equipment | 2008 | Total exemption (full) |
| MCI PRECISION SCREENS LIMITED | Computers, electronics and optics | 2009 | Total exemption (full) |
| A.R. WILLIS CATERING TRAILERS LTD. | Motor vehicles and parts | 2009 | Total exemption (full) |
| SYRRIS LIMITED | Machinery and equipment | 2009 | Audit-exempt subsidiary |
| SAVOURSMITHS LIMITED | Food products | 2010 | Total exemption (full) |
| SAPPHIRE INSPECTION SYSTEMS LTD | Computers, electronics and optics | 2010 | Total exemption (full) |
| LONDON CABINET MAKERS LTD | Furniture | 2010 | Total exemption (full) |