| APOSTOLOU, Stephanie ACTIVE | Director | 01 Mar 2020 | | United States | December 1980 | Koppers Inc, 436 Seventh Avenue, Pittsburgh, United States |
| BRENNER, Eric David ACTIVE | Director | 09 Jun 2026 | | United States | January 1983 | Koppers Inc, 436 Seventh Avenue, Pittsburgh, United States |
| CRIMP, Stephen ACTIVE | Director | 01 Dec 2023 | | Denmark | September 1968 | Koppers Performance Chemicals, Avernakte, 5800, Nyborg, Denmark |
| FENWICK, Douglas James ACTIVE | Director | 31 Dec 2018 | | United States | March 1965 | Koppers Performance Chemicals, 1016 Everee Inn Road, Griffin, Georgia, United States |
| BOYLIN, Terry Leslie RESIGNED | Secretary | 01 Jul 1999 | 31 Jul 2009 | | | Port Lion, Horsley Green, High Wycombe, Buckinghamshire, HP14 3UX |
| HASLER, Brian Thomas RESIGNED | Secretary | 20 Jan 1998 | 01 Jul 1999 | | | 25 Cliffe Road, Godalming, Surrey, GU7 2JX |
| LEANEY, Shelley RESIGNED | Secretary | 24 Mar 1995 | 20 Jan 1998 | | | West Cottage 29 High Street, Newick, East Sussex, BN8 4LG |
| COMBINED SECRETARIAL SERVICES LIMITED RESIGNED | Nominee Secretary | 24 Mar 1995 | 24 Mar 1995 | | | Victoria House, 64 Paul Street, London, EC2A 4NG |
| AUSTIN, Anthony James RESIGNED | Director | 21 Apr 2022 | 15 Apr 2025 | England | September 1979 | Protim Solignum Ltd, Lingfield Way, Darlington, DL1 4QA, England |
| BALL JR, Leroy Magnus RESIGNED | Director | 13 Nov 2014 | 13 Nov 2014 | Usa | May 1968 | 436, Seventh Avenue, Pittsburgh, Pa 15219, United States Of America |
| BOYLIN, Terry Leslie RESIGNED | Director | 01 Jul 1999 | 31 Jul 2009 | | March 1937 | Port Lion, Horsley Green, High Wycombe, Buckinghamshire, HP14 3UX |
| CHRISTENSEN, Thomas Scharling RESIGNED | Director | 13 Nov 2014 | 01 Dec 2023 | England | September 1963 | Globe Park, Thames Industrial Estate, Fieldhouse Lane, Marlow, Buckinghamshire, SL7 1LS, England |
| CHRISTENSEN, Thomas RESIGNED | Director | 11 Apr 1995 | 20 Apr 1998 | | September 1963 | Stutmesterparken 2.2, Hilleroed, Denmark, 3400, FOREIGN |
| EWBANK, Gordon Andrew RESIGNED | Director | 08 Nov 2000 | 30 Nov 2013 | England | July 1956 | 128 Church Road, Wheatley, Oxford, OX33 1LU |
| GOYDAN, Paul Alexander RESIGNED | Director | 03 Jul 1998 | 13 Nov 2014 | Usa | February 1947 | 125 Claridge Drive, Atlanta, Ga 30342, FOREIGN, Usa |
| HANSEN, Stig-Ove Alexander-Kongsted RESIGNED | Director | 11 Apr 1995 | 25 Aug 1997 | | November 1940 | 925 Delaware Avenue, Buffalo, Erie New York, Usa |
| HARRIS, Neil RESIGNED | Director | 01 Aug 1998 | 29 Feb 2004 | | February 1949 | La Pigeonniere, Lartigue, Genissac 33420, France |
| JEPSON, Stuart RESIGNED | Director | 05 Mar 2002 | 31 May 2020 | United Kingdom | February 1955 | Bowfell, Lordswell Lane, Crowborough, East Sussex, TN6 1HX |
| LACY, Steven Robert RESIGNED | Director | 13 Nov 2014 | 13 Nov 2014 | United States | January 1956 | 436, Seventh Avenue, Pittsburgh, Pa 15219, United States Of America |
| LACY, Steven Robert RESIGNED | Director | 13 Nov 2014 | 01 Mar 2020 | United States | January 1956 | 436, Seventh Avenue, Pittsburgh, Pennsylvania, United States |
| LEANEY, Stephen Glen RESIGNED | Director | 24 Mar 1995 | 20 Jan 1998 | | January 1954 | West Cottage 29 High Street, Newick, Lewes, East Sussex, BN8 4LG |
| MCCONNELL, Ian RESIGNED | Director | 01 Jul 1999 | 31 Dec 2014 | England | August 1950 | Maxwood, New Road Shiplake, Henley-On-Thames, Oxfordshire, RG9 3LG |
| REEDER, Stephen Clifford RESIGNED | Director | 13 Nov 2014 | 31 Dec 2018 | United States | December 1952 | 436, Seventh Avenue, Pittsburgh, Pennsylvania 15219, United States |
| SMITH, Jimmi Sue RESIGNED | Director | 10 Feb 2022 | 05 Jan 2026 | United States | August 1972 | Koppers Inc., 436 Seventh Avenue, Pittsburgh, PA 15219, United States |
| SPENGLER JR, James Roger RESIGNED | Director | 03 Jul 1998 | 15 Aug 2014 | Usa | October 1951 | 9 Woodcrest Drive Orchard Park, Erie New York 14127, Usa |
| TAYLOR, John RESIGNED | Director | 20 Jan 1998 | 03 Jul 1998 | | March 1947 | 295 Manor Drive, Fayetteville Ga 30215, Usa, FOREIGN |
| ZUGAY, Michael J RESIGNED | Director | 13 Nov 2014 | 10 Feb 2022 | United States | January 1952 | 436, Seventh Avenue, Pittsburgh, Pennsylvania 15219, United States |
| COMBINED NOMINEES LIMITED RESIGNED | Nominee Director | 24 Mar 1995 | 24 Mar 1995 | | | Victoria House, 64 Paul Street, London, EC2A 4NA |
| COMBINED SECRETARIAL SERVICES LIMITED RESIGNED | Nominee Director | 24 Mar 1995 | 24 Mar 1995 | | | Victoria House, 64 Paul Street, London, EC2A 4NG |