| BAINES, Matthew ACTIVE | Director | 01 Jun 2021 | | England | May 1974 | Sigmakalon Uk Holding Limited, Huddersfield Road, Birstall, Batley, West Yorkshire, WF17 9XA |
| MATHERS, Maureen Ann ACTIVE | Director | 29 May 2026 | | England | August 1974 | Sigmakalon Uk Holding Limited, Huddersfield Road, Birstall, Batley, West Yorkshire, WF17 9XA |
| BURGIN, Richard Anthony RESIGNED | Secretary | 02 Jan 1997 | 23 Dec 1999 | | | 26 The Oval, Harrogate, North Yorkshire, HG2 9BA |
| HAIGH, John RESIGNED | Secretary | | 16 Oct 1992 | | | 67 Green Lane, Wyke, Bradford, West Yorkshire, BD12 8LE |
| HARRISON, Sheila RESIGNED | Secretary | 19 Oct 1992 | 05 Sep 1994 | | | 9 Chomlea Devisdale Road, Bowden, Cheshire, WA14 2TA |
| JONES, Rosamund RESIGNED | Secretary | 21 Feb 2003 | 10 Mar 2003 | | | Flat 4 Meadow View Apartments, Ouston Lane, Tadcaster, North Yorkshire, LS24 8DP |
| SHERWOOD, Claire Diane RESIGNED | Secretary | 23 Dec 1999 | 30 Mar 2009 | | | Moor Edge Farm, Old Lindley Holywell Green, Halifax, West Yorkshire, HX4 9DF |
| WEBB, Steven John RESIGNED | Secretary | 05 Sep 1994 | 02 Jan 1997 | | | 17 Harlow Oval, Harrogate, North Yorkshire, HG2 0DS |
| BOISSIER, Roger Humphrey RESIGNED | Director | | 07 May 1999 | England | June 1930 | Easton House The Pastures, Repton, Derby, Derbyshire, DE65 6GG |
| CAMPBELL, Laurence James RESIGNED | Director | 21 Aug 1996 | 12 Nov 1999 | England | September 1951 | The Holt, Briestfield, West Yorkshire, WF12 0PA |
| CORNELIS, Francois Marc Ghilsain RESIGNED | Director | 07 May 1999 | 26 Feb 2003 | | October 1949 | Clos Des Salanganes 6, B-1150 Woluwe St Pierre, Brussels, Belgium, FOREIGN |
| DELEENER, Pierre Marie Edgard Joseph RESIGNED | Director | 07 May 1999 | 01 Jan 2010 | | August 1957 | Javastraat 2d, Am Denthaag, 2585, The Netherlands |
| EVANS, Phillip Raymond RESIGNED | Director | 12 Nov 1999 | 31 Dec 2007 | United Kingdom | January 1948 | Charlcote, Forbes Park, Robins Lane, Bramhall, Stockport, Cheshire, SK7 2RE |
| FORMERY, Marc Louis Antoine RESIGNED | Director | 09 Jun 1995 | 07 May 2002 | | February 1951 | 23 Rue Des Oiseaux, Viroflay, 78220, France |
| HARTLEY, Frank Robinson, Professor RESIGNED | Director | 01 Mar 1994 | 07 May 1999 | | January 1942 | Cayley Lodge, Prince Philip Avenue, Cranfield, Bedfordshire, MK43 0SX |
| HENNESSY, Michael John Windsor RESIGNED | Director | | 13 Apr 1999 | | September 1943 | Barn Close Riddings Lane, Curbar Calver, Hope Valley, South Yorkshire, S32 3YT |
| JACKSON, Paul Rodney RESIGNED | Director | | 06 Aug 1996 | | November 1944 | Lilac Cottage, Cross Lane Stocksmoor, Huddersfield, West Yorkshire, HD4 6XH |
| METCALF, Jason Paul RESIGNED | Director | 01 Oct 2010 | 01 Jun 2021 | United Kingdom | March 1973 | Sigmakalon Uk Holding Limited, Huddersfield Road, Birstall, Batley, West Yorkshire, WF17 9XA, United Kingdom |
| MOLYNEUX, Gregory Alan RESIGNED | Director | 31 Dec 2007 | 30 Sep 2010 | United Kingdom | August 1965 | Sigmakalon Uk Holding Limited, Huddersfield Road, Birstall, Batley, West Yorkshire, WF17 9XA, United Kingdom |
| PARRY, Felicity Anne RESIGNED | Director | 01 Jun 2009 | 31 Jul 2019 | England | August 1967 | Sigmakalon Uk Holding Limited, Huddersfield Road, Birstall, Batley, West Yorkshire, WF17 9XA, United Kingdom |
| POCOCK, Steven RESIGNED | Director | 01 Oct 2010 | 03 Jun 2026 | United Kingdom | May 1962 | Sigmakalon Uk Holding Limited, Huddersfield Road, Birstall, Batley, West Yorkshire, WF17 9XA, United Kingdom |
| SEEUWS, Jean-Pierre RESIGNED | Director | 09 Jun 1995 | 07 May 1999 | | January 1945 | 7 Bis Rue Etienne Peroux, Maisons-Lafitte, 78600, France |
| SINDHAR, Amrik Singh RESIGNED | Director | 31 Jul 2019 | 30 Nov 2022 | England | April 1986 | Sigmakalon Uk Holding Limited, Huddersfield Road, Birstall, Batley, West Yorkshire, WF17 9XA |
| SMITH, Eric RESIGNED | Director | | 09 Jun 1995 | | August 1942 | The Bungalow Roberttown Lane, Roberttown, Liversedge, West Yorkshire, WF15 7NR |
| WAKEHAM, John, The Right Hon Lord RESIGNED | Director | 09 Jun 1995 | 31 May 2001 | | June 1932 | Flat 75 Palace Court, London, W2 4JE |
| WOESTELANDT, Hugues RESIGNED | Director | 07 May 2002 | 26 Feb 2003 | | February 1946 | 70 Rue De L'Amiral Mouchez, 75014 Paris, FOREIGN, France |