| GALLI, Jon ACTIVE | Secretary | 01 Jan 2021 | | | | 251, Ballardvale Street, Wilmington, Massachusetts 01887, United States |
| DOLPH, Kerstin Susanne ACTIVE | Director | 29 Sep 2025 | | United States | August 1980 | 11, Jacob Road, Windham, NH 03087, United States |
| FINN, Kevin John ACTIVE | Director | 11 May 2022 | | United States | July 1971 | 251, Ballardvale Street, Wilmington, Massachusetts 01887, United States |
| CLEMENT, Mark Rowland RESIGNED | Secretary | 05 Feb 1996 | 05 Jan 1998 | | | 33, King Street, London, SW1Y 6RJ |
| HARRIS, Mark Malcolm RESIGNED | Secretary | 05 Jan 1998 | 28 Jan 2000 | | | Bridge Farm House, Rushbrooke, Bury St Edmunds, Suffolk, IP30 0BP |
| MADROLLE, Christian Serge RESIGNED | Secretary | 14 Sep 2001 | 30 Jun 2011 | | | Flat 1, Stanhope Gardens, London, SW7 5QX, United Kingdom |
| MCKINLEY, John Aiken RESIGNED | Secretary | 11 Mar 1992 | 05 Feb 1996 | | | 1 The Row, Henham, Bishops Stortford, CM22 6AT |
| PILARCZYK, Michael Lee RESIGNED | Secretary | 30 Jun 2011 | 24 Jul 2015 | | | Charles River Laboratories, Manston Road, Margate, Kent, CT9 4LT |
| PRICE, Sarah Margaret RESIGNED | Secretary | 24 Jul 2015 | 31 Dec 2020 | | | Charles River Laboratories, Manston Road, Margate, Kent, CT9 4LT |
| WILLIAMS, Julia May RESIGNED | Secretary | 28 Jan 2000 | 14 Sep 2001 | | | Holly House, Illings Lane, Broughton, Huntingdon, Cambridgeshire, PE28 3AW |
| COMBINED SECRETARIAL SERVICES LIMITED RESIGNED | Nominee Secretary | 09 Mar 1992 | 11 Mar 1992 | | | Victoria House, 64 Paul Street, London, EC2A 4NG |
| ANDREWS, Paul John RESIGNED | Director | 19 Apr 1999 | 30 Apr 2000 | United Kingdom | September 1959 | Oakbury House, Hatfield Broad Oak, Bishops Stortford, Hertfordshire, CM22 7JY |
| CLEMENT, Mark Rowland RESIGNED | Director | 01 Jun 1993 | 01 Dec 1997 | United Kingdom | October 1960 | 33, King Street, London, SW1Y 6RJ |
| DESFORGES, Malcolm RESIGNED | Director | 26 Aug 1992 | 17 Jun 1993 | England | January 1944 | Orchard House, High Street, Ketton, Stamford, Lincolnshire, PE9 3TA |
| EDGE, William RESIGNED | Director | 26 Aug 1992 | 17 Jun 1993 | | October 1936 | Triboges House, Berries Road, Cookham, Berkshire, SL6 9SD |
| EVANS, Christopher Thomas, Professor RESIGNED | Director | 11 Mar 1992 | 03 Sep 2009 | United Kingdom | November 1957 | 33 King Street, St James's, London, SW1Y 6RJ |
| GRANT, Peter Leonard, Dr RESIGNED | Director | 28 May 1993 | 28 Feb 2005 | | June 1959 | Harlequin Old Hurst Road, Pidley, Huntingdon, Cambridgeshire, PE17 3BY |
| HARRIS, Mark Malcolm RESIGNED | Director | 05 Jan 1998 | 28 Jan 2000 | | September 1960 | Bridge Farm House, Rushbrooke, Bury St Edmunds, Suffolk, IP30 0BP |
| HILYARD, Katherine Louise, Dr RESIGNED | Director | 24 Jul 2015 | 01 Nov 2017 | England | November 1965 | Charles River Laboratories, Manston Road, Margate, Kent, CT9 4LT |
| HOLDEN, Arthur Leonard RESIGNED | Director | 02 Sep 1994 | 11 Mar 1998 | | August 1953 | 171 Church Road, Winetka 60093, Illinois, Usa |
| JORDAN, Foster Timmons RESIGNED | Director | 24 Jul 2015 | 11 May 2022 | United Kingdom | May 1967 | Charles River Laboratories, Manston Road, Margate, Kent, CT9 4LT |
| KERTON, Nicholas Anthony, Dr RESIGNED | Director | 04 Jun 1993 | 31 Oct 1996 | | November 1950 | 2 Radegunds, Whittlesford, Cambridge, CB2 4UD |
| LECOQUE, Jay Charles RESIGNED | Director | 01 Feb 2001 | 24 Jul 2015 | United States | November 1962 | Charles River Laboratories, Manston Road, Margate, Kent, CT9 4LT |
| MADROLLE, Christian Serge RESIGNED | Director | 01 Oct 2009 | 30 Jun 2011 | Belgium | June 1946 | 50, Broadway, St James's Park Westminster, London, SW1H 0RG, England |
| MADROLLE, Christian Serge RESIGNED | Director | 01 Oct 2000 | 03 Sep 2009 | Belgium | June 1946 | Rozenlaan 23, Rhode Saint Genese, 1640, Belgium |
| MARTIN, Anthony Francis, Doctor RESIGNED | Director | 15 Mar 1993 | 31 Mar 1994 | | June 1954 | 7 Tuckers Drive, Holmer Green, High Wycombe, Buckinghamshire, HP15 6SY |
| MCKINLEY, John Aiken RESIGNED | Director | 01 Apr 1994 | 31 Dec 1995 | | June 1954 | 1 The Row, Henham, Bishops Stortford, CM22 6AT |
| MCKINLEY, John Aiken RESIGNED | Director | 26 Aug 1992 | 17 Jun 1993 | | June 1954 | 1 The Row, Henham, Bishops Stortford, CM22 6AT |
| MONTANA, John Gary, Dr RESIGNED | Director | 05 Dec 2017 | 23 Dec 2019 | United Kingdom | April 1963 | Robinson Building, Chesterford Park, Little Chesterford, Saffron Walden, Essex, CB10 1XL, England |
| MORRIS, John Rankin RESIGNED | Director | 22 Apr 1992 | 31 Dec 2004 | | June 1930 | Chalet Muehlematt, Ch 6340, Inwil/Baar, Switzerland |
| PEASE, Flavia Houaiss RESIGNED | Director | 11 May 2022 | 29 Sep 2025 | United States | December 1972 | 251, Ballardvale Street, Wilmington, Massachusetts 01887, United States |
| PILARCZYK, Michael Lee, Mr. RESIGNED | Director | 01 Jun 2011 | 16 Apr 2012 | Usa | August 1959 | 50, Broadway, St James's Park Westminster, London, SW1H 0RG, England |
| PRECIOUS, John Richard RESIGNED | Director | 28 May 1993 | 18 Feb 1997 | United Kingdom | August 1942 | Spindles Hotley Bottom Lane, Prestwood, Great Missenden, Buckinghamshire, HP16 9PL |
| ROWELL, Jack RESIGNED | Director | 29 Feb 2000 | 03 Sep 2009 | United Kingdom | November 1936 | Middlehill House, Middlehill, Box, Wiltshire, SN13 8QS |
| SMITH, David Ross RESIGNED | Director | 24 Jul 2015 | 11 May 2022 | United Kingdom | September 1965 | Charles River Laboratories, Manston Road, Margate, Kent, CT9 4LT |
| CELSIS LIMITED RESIGNED | Director | 01 Oct 2000 | 01 Oct 2009 | | | 1010, Cambourne Business Park, Cambourne, Cambridge, CB236DP |
| COMBINED NOMINEES LIMITED RESIGNED | Nominee Director | 09 Mar 1992 | 10 Mar 1992 | | | Victoria House, 64 Paul Street, London, EC2A 4NA |
| COMBINED SECRETARIAL SERVICES LIMITED RESIGNED | Nominee Director | 09 Mar 1992 | 11 Mar 1992 | | | Victoria House, 64 Paul Street, London, EC2A 4NG |