| A G SECRETARIAL LIMITED ACTIVE | Secretary | 01 May 2015 | | | | Milton Gate, 60 Chiswell Street, London, EC1Y 4AF, United Kingdom |
| BIRO, Peter ACTIVE | Director | 01 Jul 2017 | | Switzerland | June 1967 | Bedfont Cross, Stanwell Road, Feltham, Middlesex, TW14 8NX, United Kingdom |
| JACKSON, Victor Mark ACTIVE | Director | 27 Aug 2015 | | United Kingdom | May 1962 | The Old Brickyard, Brickfield Industrial Estate, Gillingham, Dorset, SP8 4XT, England |
| DEAN, Rayna RESIGNED | Secretary | 15 May 1997 | 14 Apr 2004 | | | Moss Farm Moss Lane, Over Tabley, Knutsford, Cheshire, WA16 0PH |
| LUCAS, Graham RESIGNED | Secretary | 14 Apr 2004 | 27 Aug 2015 | | | The Old Brickyard, New Road, Gillingham, Dorset, SP8 4XT |
| SCHEINMANN, Daniel RESIGNED | Secretary | 24 Mar 1992 | 15 May 1997 | | | 12 Fairway Drive, Sale, Cheshire, M33 4PW |
| SCHEINMANN, Kalalin Esther RESIGNED | Secretary | | 24 Mar 1992 | | | 12 Fairway Drive, Sale, Cheshire, M33 4PW |
| ANGGARD, Erik, Professor RESIGNED | Director | 01 Oct 1997 | 30 Sep 1999 | England | March 1934 | Penns, Marsh Baldon, Oxford, OX44 9LS |
| BARNES, Alan RESIGNED | Director | | 31 Aug 1997 | | July 1930 | Chorlton House Fulshaw Park, Wilmslow, Cheshire, SK9 1QH |
| BIRKINSHAW, John Pearson RESIGNED | Director | 23 Apr 1992 | 06 Oct 1999 | | March 1934 | 221 Hale Road, Hale, Altrincham, Cheshire, WA15 8DN |
| CLARK, Michael RESIGNED | Director | 20 Oct 1998 | 14 Apr 2004 | | September 1946 | 23 Suffolk Square, Cheltenham, Gloucestershire, GL50 2QA |
| CLULEY, Boris John RESIGNED | Director | 21 Oct 1993 | 30 Jan 1995 | | October 1934 | Badgers Hollow, Macclesfield Road, Alderley Edge, Cheshire, SK9 7BW |
| DEAN, Rayna RESIGNED | Director | 15 May 1997 | 14 Apr 2004 | United Kingdom | July 1952 | Moss Farm Moss Lane, Over Tabley, Knutsford, Cheshire, WA16 0PH |
| FLAIKS, Anthony Barry RESIGNED | Director | | 02 Mar 1992 | | May 1932 | 136 Framingham Road, Sale, Cheshire, M33 3RG |
| FROMSON, John, Dr RESIGNED | Director | 01 May 2002 | 14 Apr 2004 | | October 1941 | The Mew Busbridge Hall, Home Farm Road Busbridge, Godalming, Surrey, GU7 1XG |
| GRATION, David Whitnall RESIGNED | Director | 01 Oct 1997 | 30 Sep 1998 | | April 1939 | Maple Corner Maple Lane, Upper Basildon, Reading, Berkshire, RG8 8PF |
| GREEN, Eric Mark RESIGNED | Director | 14 Apr 2004 | 18 Mar 2014 | Usa | May 1969 | 1566 Buckhurst Court, Ballwin, Missouri 63021, Usa |
| IRVING, Edward, Dr RESIGNED | Director | 08 May 2000 | 14 Apr 2004 | | January 1951 | 22 Birkdale Gardens, Winsford, Cheshire, CW7 2LE |
| KRATZER, Stefan RESIGNED | Director | 26 May 2016 | 01 Jul 2017 | United Kingdom | February 1975 | Bedfont Cross, Stanwell Road, Feltham, Middlesex, TW14 8NX, United Kingdom |
| LUCAS, Graham RESIGNED | Director | 14 Apr 2004 | 27 Aug 2015 | United Kingdom | May 1958 | The Old Brickyard, New Road, Gillingham, Dorset, SP8 4XT |
| ROBERTS, Stanley Michael, Prof. RESIGNED | Director | 01 Oct 1997 | 28 Feb 2001 | United Kingdom | February 1945 | Blakehouse House, Kersbrook, Devon, EX9 7AB |
| SCHEINMANN, Feodor, Dr RESIGNED | Director | | 14 Apr 2004 | | July 1933 | 12 Fairway Drive, Sale, Manchester, M33 4PW |
| STOCKS, John Dennis RESIGNED | Director | 23 Apr 1992 | 14 Apr 2004 | | August 1934 | Mansard House Winchester Avenue, Chorley, Lancashire, PR7 4AQ |
| VAN DEN DOOL, Gerrit RESIGNED | Director | 18 Mar 2014 | 11 Nov 2016 | Switzerland | July 1953 | Sigma-Aldrich International Gmbh, Sigma-Aldrich International Gmbh, Wassergasse 7, 9000 St. Gallen, Switzerland |
| VAN OUDENAREN, Henry RESIGNED | Director | 04 Jan 2005 | 13 Aug 2007 | | September 1961 | 108 Broadview Avenue, Whitby, Ontario, L1n 2g5, Canada |
| WAKEFIELD, Basil John, Dr RESIGNED | Director | | 31 Jul 1999 | | September 1934 | 86 Harboro Road, Sale, Manchester, M33 6GE |