| MILLAR-KELLY, Lynne Elizabeth Duncan ACTIVE | Secretary | 16 Mar 2022 | | | | Ash Road, Wrexham Industrial Estate, Wrexham, LL13 9UF |
| BREND, Jeannette ACTIVE | Director | 01 Nov 2022 | | United Kingdom | November 1971 | Ash Road, Wrexham Industrial Estate, Wrexham, LL13 9UF |
| CHADDOCK, John Andrew, Dr ACTIVE | Director | 18 Nov 2016 | | United Kingdom | August 1968 | Ash Road, Wrexham Industrial Estate, Wrexham, LL13 9UF |
| MILLAR-KELLY, Lynne Elizabeth Duncan ACTIVE | Director | 16 Mar 2022 | | United Kingdom | August 1983 | Ash Road, Wrexham Industrial Estate, Wrexham, LL13 9UF |
| PARSONS, Ioana ACTIVE | Director | 08 Mar 2024 | | United Kingdom | February 1979 | Ash Road, Wrexham Industrial Estate, Wrexham, LL13 9UF |
| VISCIGLIO, Alexandre ACTIVE | Director | 28 May 2021 | | France | January 1979 | Ash Road, Wrexham Industrial Estate, Wrexham, LL13 9UF |
| BOOTH, Edward Andrew RESIGNED | Secretary | 01 Jul 2013 | 30 Apr 2015 | | | 190, Bath Road, Slough, Berkshire, SL1 3XE, Uk |
| BUSBY, Robyn Elizabeth RESIGNED | Secretary | 31 May 2018 | 11 Oct 2018 | | | 190, Bath Road, Slough, Berkshire, SL1 3XE, United Kingdom |
| DAVIS, John Charles RESIGNED | Secretary | | 30 Jun 2013 | | | 190 Bath Road, Slough, Berkshire, SL1 3XE |
| LAMB, Catherine RESIGNED | Secretary | 11 Oct 2018 | 15 Oct 2020 | | | 190, Bath Road, Slough, Berkshire, SL1 3XE, United Kingdom |
| MILLAR, Lynne RESIGNED | Secretary | 15 Oct 2020 | 28 May 2021 | | | Ash Road, Wrexham Industrial Estate, Wrexham, LL13 9UF |
| PULLEN, Jane Elizabeth RESIGNED | Secretary | 30 Apr 2015 | 31 May 2018 | | | 190, Bath Road, Slough, Berkshire, SL1 3XE |
| TOMKINSON, Re-Natta RESIGNED | Secretary | 28 May 2021 | 16 Mar 2022 | | | Ash Road, Wrexham Industrial Estate, Wrexham, LL13 9UF |
| ALI, Asad Mohsin RESIGNED | Director | 15 Oct 2018 | 16 Mar 2022 | United Kingdom | October 1975 | 190, Bath Road, Slough, Berkshire, SL1 3XE, United Kingdom |
| ALLSOP, Judith Mary RESIGNED | Director | 31 Mar 2015 | 01 May 2018 | United Kingdom | June 1968 | Ash Road, Wrexham Industrial Estate, Wrexham, Clwyd, LL13 9UF, United Kingdom |
| BARNSLEY, Jonathan Henry RESIGNED | Director | 27 Aug 2014 | 22 Dec 2017 | Uk | January 1957 | 190, Bath Road, Slough, Berkshire, SL1 3ZE, United Kingdom |
| BEAUFOUR, Albert Henri, Dr RESIGNED | Director | 12 Dec 1994 | 28 Jan 2000 | | November 1923 | 19 Kensington Square, London, W8 5HH |
| BEAUFOUR, Philippe Henri RESIGNED | Director | 12 Dec 1994 | 17 Dec 1998 | | April 1959 | 22 Victoria Grove, London, W8 5RW |
| BOOTH, Edward Andrew RESIGNED | Director | 01 Jul 2013 | 11 Feb 2016 | Wales | November 1973 | 190, Bath Road, Slough, Berkshire, SL1 3XE, Uk |
| BOYNE, Isobel Louise RESIGNED | Director | 27 Mar 2018 | 28 May 2021 | United Kingdom | January 1969 | Ash Road, Wrexham Industrial Estate, Wrexham, Clwyd, LL13 9UF, United Kingdom |
| BURKE, John Vernon RESIGNED | Director | | 15 Jul 1993 | | June 1944 | 11 Woodgate Crescent, Northwood, Middlesex, HA6 3RB |
| BUSBY, Robyn Elizabeth RESIGNED | Director | 18 Nov 2016 | 11 Oct 2018 | United Kingdom | August 1976 | 190, Bath Road, Slough, Berkshire, SL1 3XE, United Kingdom |
| CANAL, Christophe Alain Edmond Georges RESIGNED | Director | 01 Aug 2007 | 12 Dec 2008 | | March 1972 | 190 Bath Road, Slough, Berkshire, SL1 3XE |
| CHILVER, Amos Henry, Lord RESIGNED | Director | 01 Feb 1995 | 24 Oct 2001 | | October 1926 | 2 Hampstead Square, London, NW3 1AB |
| CHILVER, Amos Henry, Lord RESIGNED | Director | | 30 Nov 1994 | | October 1926 | 2 Hampstead Square, London, NW3 1AB |
| DAFOUR, Gabriel RESIGNED | Director | 12 Dec 1994 | 26 Dec 2001 | | April 1941 | 6 Avenue Emile Deschanel, Paris, 75007 |
| DAVIS, John Charles RESIGNED | Director | 15 Nov 2001 | 30 Jun 2013 | United Kingdom | May 1948 | 190 Bath Road, Slough, Berkshire, SL1 3XE |
| DAVIS, Nicholas Edward RESIGNED | Director | 08 Dec 2017 | 30 Nov 2020 | United Kingdom | June 1975 | Unit 9, Ash Road, Wrexham Industrial Estate, Wrexham, Wales, LL13 9UF, Wales |
| DE LA TOUR, Christian RESIGNED | Director | 15 Nov 2001 | 25 Nov 2014 | United Kingdom | November 1959 | 190 Bath Road, Slough, Berkshire, SL1 3XE |
| DRAPE, Eric RESIGNED | Director | 25 Jul 2007 | 26 Jul 2013 | France | May 1961 | 190 Bath Road, Slough, Berkshire, SL1 3XE |
| FRANCOIS, Stephane RESIGNED | Director | 12 Dec 1994 | 01 Apr 2004 | | May 1962 | 19 Kensington Square, London, W8 5HH |
| GOVER, Anthony David RESIGNED | Director | | 14 Dec 2001 | England | January 1941 | 21 Somerset Square, West Kensington, London, W14 8EE |
| GROSSART, Angus Mcfarlane Mcleod, Sir RESIGNED | Director | 01 Feb 1995 | 24 Oct 2001 | United Kingdom | April 1937 | 64 Northumberland Street, Edinburgh, EH3 6JE |
| GROSSART, Angus Mcfarlane Mcleod, Sir RESIGNED | Director | | 30 Nov 1994 | United Kingdom | April 1937 | 48 Queen Street, Edinburgh, EH2 3NR |
| HARSANYI, Zsolt, Doctor RESIGNED | Director | | 17 Dec 2001 | | February 1944 | 707 Potomac Knolls Drive, Mcclean, Virignia 22102, United States Of America |
| HARVEY, Michael John RESIGNED | Director | 03 Mar 2004 | 30 Sep 2010 | United Kingdom | January 1950 | 190 Bath Road, Slough, Berkshire, SL1 3XE |
| HAYDON-BAILLIE, Wensley Grosvenor RESIGNED | Director | | 03 Jul 1992 | | November 1943 | Cope House, Kensington Palace Gardens, London, W8 4QG |
| HICKLING, Matthew Francis, Dr RESIGNED | Director | 01 Mar 2016 | 02 May 2018 | United Kingdom | April 1974 | Ash Road, Wrexham Industrial Estate, Wrexham, LL13 9UF |
| HILL, Steven Thomas RESIGNED | Director | 27 Jun 2007 | 03 Dec 2009 | United Kingdom | July 1953 | 190 Bath Road, Slough, Berkshire, SL1 3XE |
| JOCHEM, Olivier RESIGNED | Director | 31 Mar 2015 | 10 Feb 2016 | France | November 1965 | Ash Road, Wrexham Industrial Estate, Wrexham, Wrexham, LL13 9UF, Uk |
| KRIEGER, Matthias, Dr RESIGNED | Director | 27 Apr 2021 | 11 Jul 2022 | United Kingdom | May 1970 | Ash Road, Wrexham Industrial Estate, Wrexham, LL13 9UF |
| LAMB, Catherine Anne RESIGNED | Director | 15 Oct 2018 | 30 Oct 2020 | United Kingdom | November 1978 | 190, Bath Road, Slough, Berkshire, SL1 3XE, United Kingdom |
| LAUNAY, Nicole Bernadette RESIGNED | Director | 31 Mar 2015 | 02 May 2018 | United Kingdom | January 1960 | Ipsen Biopharm Limited, Ash Road North, Wrexham Industrial Estate, Wrexham, LL13 9UF, United Kingdom |
| MCDOWALL, Ewan John RESIGNED | Director | 18 Nov 2016 | 11 Oct 2018 | United Kingdom | July 1971 | 190, Bath Road, Slough, Berkshire, SL1 3XE, United Kingdom |
| MILLAR, Lynne RESIGNED | Director | 15 Oct 2020 | 28 May 2021 | United Kingdom | August 1983 | Ash Road, Wrexham Industrial Estate, Wrexham, LL13 9UF |
| MURPHY, Aidan Gerard, Dr RESIGNED | Director | 31 Mar 2015 | 01 Jan 2018 | France | April 1966 | Ipsen Biopharm Limited, Ash Road, Wrexham Industrial Estate, Wrexham, LL13 9UF, Uk |
| OLIVER, Guy Edward RESIGNED | Director | 25 Apr 2022 | 08 Mar 2024 | England | May 1978 | Ash Road, Wrexham Industrial Estate, Wrexham, LL13 9UF |
| PADGETT, Robert Alan RESIGNED | Director | 18 Aug 1993 | 30 Nov 1994 | | May 1943 | Fishers Cottage Mill Hill, Lawford, Manningtree, Essex, CO11 2JY |
| PULLEN, Jane Elizabeth RESIGNED | Director | 11 Feb 2016 | 13 Jun 2017 | United Kingdom | March 1962 | 190, Bath Road, Slough, Berkshire, SL1 3XE |
| PURTON, Peter John RESIGNED | Director | 18 Aug 1993 | 30 Nov 1994 | | July 1933 | 12 Barton Street, London, SW1P 3NE |
| SAVAGE, John William RESIGNED | Director | 15 Nov 2001 | 23 Jun 2004 | United Kingdom | July 1950 | 14 Meadow Close, Farndon, Chester, CH3 6PP |
| SEMERJIAN, Harout RESIGNED | Director | 08 Dec 2017 | 02 May 2018 | United Kingdom | November 1970 | 190, Bath Road, Slough, Berkshire, SL1 3XE, United Kingdom |
| SHEDDEN, William Ian Hamilton, Doctor RESIGNED | Director | 12 Dec 1994 | 01 Jan 1998 | | March 1934 | Brook House Park Road, Stoke Poges, Slough, Berkshire, SL2 4PG |
| STOKES, Alistair Michael, Dr RESIGNED | Director | 27 May 1992 | 31 Dec 2009 | United Kingdom | July 1948 | 190 Bath Road, Slough, Berkshire, SL1 3XE |
| STRATTON, Anthony Hugh RESIGNED | Director | 13 Jun 2017 | 28 Mar 2018 | England | October 1963 | 190, Bath Road, Slough, Berkshire, SL1 3XE, United Kingdom |
| TOMKINSON, Re-Natta Dominica RESIGNED | Director | 28 May 2021 | 16 Mar 2022 | United Kingdom | August 1986 | Ash Road, Wrexham Industrial Estate, Wrexham, LL13 9UF |
| WHITEHOUSE, Peter George RESIGNED | Director | 07 Oct 2005 | 04 Apr 2007 | | January 1964 | 190 Bath Road, Slough, Berkshire, SL1 3XE |
| WILSON, Peter Charles RESIGNED | Director | 15 Nov 2001 | 25 Jun 2007 | | August 1946 | 190 Bath Road, Slough, Berkshire, SL1 3XE |