| WATSON, Gina Sarah ACTIVE | Secretary | 22 Dec 2016 | | | | Bio-Techne Ltd, 19 Barton Lane, Abingdon, OX14 3NB, England |
| BOHNEN, Shane ACTIVE | Director | 01 Mar 2023 | | United States | December 1974 | 614, Mckinley Place Ne, Minneapolis, Mn, 55413, United States |
| MAPLE, Hannah ACTIVE | Director | 01 Nov 2024 | | England | July 1985 | Unit 4-6, Avonbridge Trading Estate, Atlantic Road, Bristol, BS11 9QD, England |
| SCHUESSLER, Peter, Dr ACTIVE | Director | 07 Mar 2025 | | Germany | August 1966 | Unit 4-6, Avonbridge Trading Estate, Atlantic Road, Bristol, BS11 9QD, England |
| BIRNIE, Andrew James RESIGNED | Secretary | 06 Sep 2002 | 28 Apr 2011 | | | 69, Coombe Lane, Stoke Bishop, Bristol, BS9 2AZ, Great Britain |
| BRIGHT, Ruth RESIGNED | Secretary | 28 Apr 2011 | 22 Dec 2016 | | | Unit 4-6, Avonbridge Trading Estate, Atlantic Road, Bristol, BS11 9QD, England |
| COOKSON, Hugh Richard RESIGNED | Secretary | 01 Jul 1994 | 06 Sep 2002 | | | Manor House, Stratford Tony, Salisbury, Wilts, SP5 4AT |
| QUAYSEC LIMITED RESIGNED | Secretary | 20 Dec 2006 | 12 Dec 2007 | | | Narrow Quay House, Narrow Quay, Bristol, BS1 4AH |
| W W H COMPANY MANAGEMENT LIMITED RESIGNED | Nominee Secretary | 05 Nov 1993 | 01 Jul 1994 | | | 103 Temple Street, Bristol |
| BACKES, Kathleen RESIGNED | Director | 28 Apr 2011 | 13 Jan 2016 | Usa | December 1962 | Tocris House, Io Centre, Moorend Farm Avenue, Bristol, BS11 0QL, United Kingdom |
| BIRNIE, Andrew James RESIGNED | Director | 06 Sep 2002 | 30 Jun 2013 | United Kingdom | April 1968 | Tocris House, Io Centre, Moorend Farm Avenue, Bristol, BS11 0QL, United Kingdom |
| COOKSON, Hugh Richard RESIGNED | Director | 01 Jul 1994 | 20 Dec 2006 | United Kingdom | April 1954 | Manor House, Stratford Tony, Salisbury, Wilts, SP5 4AT |
| COOKSON, Richard Clive, Prof RESIGNED | Director | 01 Jul 1994 | 20 Dec 2006 | | August 1922 | Northfield House, Coombe Bissett, Salisbury, Wilts, SP5 4JZ |
| EDE, Laurence John RESIGNED | Director | 30 Oct 2000 | 30 Jun 2013 | England | September 1971 | Tocris House, Io Centre, Moorend Farm Avenue, Bristol, BS11 0QL, United Kingdom |
| FURLOW, Brenda Swierenga RESIGNED | Director | 30 Dec 2015 | 01 Mar 2023 | United States | June 1958 | Unit 4-6, Avonbridge Trading Estate, Atlantic Road, Bristol, BS11 9QD, England |
| HIPPEL, James RESIGNED | Director | 30 Dec 2015 | 01 Jul 2016 | Usa | November 1970 | Unit 4-6, Avonbridge Trading Estate, Atlantic Road, Bristol, BS11 9QD, England |
| KENNY, Anthony Edward RESIGNED | Director | 13 Mar 2007 | 28 Apr 2011 | United Kingdom | January 1961 | Pricewaterhousecoopers Llp, 1 Embankment Place, London, WC2N 6RH |
| KUMMETH, Charles Robert RESIGNED | Director | 31 Jan 2014 | 01 Sep 2017 | Usa | June 1960 | Unit 4-6, Avonbridge Trading Estate, Atlantic Road, Bristol, BS11 9QD, England |
| MELSEN, Greg RESIGNED | Director | 28 Apr 2011 | 31 Jan 2014 | Usa | April 1952 | Tocris House, Io Centre, Moorend Farm Avenue, Bristol, BS11 0QL, United Kingdom |
| MORTARI, Frank RESIGNED | Director | 28 Apr 2011 | 30 Dec 2015 | United Kingdom | August 1956 | Tocris House, Io Centre, Moorend Farm Avenue, Bristol, BS11 0QL, United Kingdom |
| PARSONS, Philip James, Professor RESIGNED | Director | 01 Jul 1994 | 20 Dec 2006 | England | June 1952 | St. Margarets, Tilsmore Road, Heathfield, East Sussex, TN21 0XT |
| PETERS, David Alan, Dr RESIGNED | Director | 01 Jul 2013 | 07 Mar 2025 | England | July 1969 | Unit 4-6, Avonbridge Trading Estate, Atlantic Road, Bristol, BS11 9QD, England |
| PETERS, David RESIGNED | Director | 20 Dec 2006 | 05 Jan 2007 | | July 1969 | 12 Nightingale Rise, Portishead, Bristol, Avon, BS20 8LN |
| STAPLETON, Gary Michael RESIGNED | Director | 01 Jul 2016 | 01 Mar 2023 | England | December 1963 | Bio-Techne Ltd, Barton Lane, Abingdon, OX14 3NB, England |
| SUNTER, David Colin, Dr RESIGNED | Director | 01 Jul 1994 | 20 Dec 2006 | England | September 1952 | Chestnut Farm North End Road, Yatton, Bristol, Avon, BS19 4AS |
| WATKINS, Jeffrey Clifton, Prof RESIGNED | Director | 01 Jul 1994 | 25 May 2006 | | December 1929 | 8 Lower Court Road, Almondsbury, Bristol, Avon, BS12 4DX |
| YATES, Christopher Cavill RESIGNED | Director | 01 Jul 1994 | 22 Nov 1996 | | March 1915 | 34 Roebuck Lane, Buckhurst Hill, Essex, IG9 5QN |
| W W H COMPANY DIRECTORS LIMITED RESIGNED | Director | 05 Nov 1993 | 01 Jul 1994 | | | 103 Temple Street, Bristol, Avon, BS99 7UD |