| WATTS, Jude Anthony, Dr ACTIVE | Secretary | 01 Jul 2019 | | | | 1, Beadon Road, London, W6 0EA, England |
| AOKI, Hirofumi ACTIVE | Director | 01 Apr 2026 | | Japan | May 1975 | 1, Beadon Road, London, W6 0EA, England |
| HEMMI, Kotoba ACTIVE | Director | 21 Apr 2026 | | Japan | June 1981 | 1, Beadon Road, London, W6 0EA, England |
| SAKUMA, Masayuki ACTIVE | Director | 28 Apr 2022 | | Japan | October 1965 | 1, Beadon Road, London, W6 0EA, England |
| ABE, Hideki RESIGNED | Secretary | 08 Jul 1999 | 30 Apr 2003 | | | C/O Sumitomo Chemical (Uk) Plc, Horatio House, 77-85 Fulham Palace Road, London, W6 8JA |
| IKEDA, Nobunari RESIGNED | Secretary | | 17 Jan 1995 | | | 39 Toley Avenue, Wembley, Middlesex, HA9 9TD |
| KOBAYASHI, Masaru RESIGNED | Secretary | 01 Sep 2007 | 29 Jul 2011 | | | Horatio House, 77-85 Fulham Palace Road, London, W6 8JA |
| NAKASHIMA, Masahiro RESIGNED | Secretary | 17 Jan 1995 | 04 Aug 1995 | | | 18 Shaftesbury Avenue, Kenton, Harrow, Middlesex, HA3 0QX |
| NISHIDA, Yasushi RESIGNED | Secretary | 30 Apr 2003 | 01 Sep 2007 | | | Sumitomo Chemical (Uk) Plc, Horatio House, 77-85 Fulham Palace Road, London, W6 8JA |
| OKUNO, Takeo RESIGNED | Secretary | 25 Sep 2014 | 01 Jul 2019 | | | Hythe House, 200 Shepherds Bush Road, London, W6 7NL, United Kingdom |
| SHIBAYAMA, Hisashi RESIGNED | Secretary | 04 Aug 1995 | 08 Jul 1999 | | | 21 Chalice Court, East End Road, London, N2 8NU |
| TAKAMI, Hisashi RESIGNED | Secretary | 29 Jul 2011 | 25 Sep 2014 | | | Horatio House, 77-85 Fulham Palace Road, London, W6 8JA |
| ABE, Hideki RESIGNED | Director | 08 Jul 1999 | 30 Apr 2003 | | May 1965 | C/O Sumitomo Chemical (Uk) Plc, Horatio House, 77-85 Fulham Palace Road, London, W6 8JA |
| DAVIS, Philip RESIGNED | Director | 24 Jun 2005 | 30 Jun 2006 | | May 1949 | C/O Sumitomo Chemical (Uk) Plc, Horatio House, 77-85 Fulham Palace Road,London, W6 8JA |
| ENAMI, Takatsugu RESIGNED | Director | 27 Jun 2002 | 24 Jun 2005 | | November 1946 | 5-1-3 Kizucho Kabutodai, Solaku-Gun, Kyoto, 619-0224, Japan |
| HASHIZUME, Masaya RESIGNED | Director | 07 Apr 2020 | 02 Aug 2021 | England | December 1969 | Hythe House, 200 Shepherds Bush Road, London, W6 7NL |
| HERN, Murray Denis RESIGNED | Director | 01 Apr 2019 | 01 Apr 2026 | England | November 1964 | 1, Beadon Road, London, W6 0EA, England |
| HIROSE, Yukihiro, Dr RESIGNED | Director | 28 Jul 2021 | 21 Mar 2024 | England | September 1973 | Hythe House, 200 Shepherds Bush Road, London, W6 7NL |
| IKEDA, Nobunari RESIGNED | Director | | 17 Jan 1995 | | November 1950 | 39 Toley Avenue, Wembley, Middlesex, HA9 9TD |
| IKEDA, Tomokazu RESIGNED | Director | 01 Oct 2024 | 01 Apr 2026 | Japan | January 1970 | 1, Beadon Road, London, W6 0EA, England |
| IMAI, Shinichiro RESIGNED | Director | 01 Apr 2015 | 01 Jan 2018 | Japan | February 1965 | Hythe House, 200 Shepherds Bush Road, London, W6 7NL |
| ITO, Kiyotaka RESIGNED | Director | 01 Apr 2024 | 01 Oct 2024 | Japan | October 1970 | 1, Beadon Road, London, W6 0EA, England |
| KOBAYASHI, Akio RESIGNED | Director | | 26 Jun 1992 | | September 1935 | 6-19-2 Seijyo, Setagaya-Ku, Tokyo, FOREIGN, Japan |
| KOBAYASHI, Masaru RESIGNED | Director | 01 Sep 2007 | 29 Jul 2011 | United Kingdom | November 1968 | Horatio House, 77-85 Fulham Palace Road, London, W6 8JA |
| KOMAKI, Norio RESIGNED | Director | 19 May 1995 | 27 Aug 1996 | | May 1937 | 3-10-28 Kuzuamisaki, Hirakata City, Osaka 573, Japan |
| MARTIN, Robert, Dr. RESIGNED | Director | 01 Apr 2019 | 01 Jul 2019 | England | September 1952 | Hythe House, 200 Shepherds Bush Road, London, W6 7NL |
| MARTIN, Robert, Dr. RESIGNED | Director | 01 Dec 2008 | 01 Apr 2019 | England | September 1952 | Hythe House, 200 Shepherds Bush Road, London, W6 7NL |
| MATSUO, Shinichiro RESIGNED | Director | | 26 Apr 1992 | | September 1949 | 142 Chanctonbury Way, London, N12 7AD |
| MOROISHI, Mitsuhiro RESIGNED | Director | | 19 May 1995 | | July 1937 | 2-24-12 Kitarokkodai, Nishinomiya-City, Hyogo 651-14, Japan |
| NAGAO, Masaaki RESIGNED | Director | 27 Aug 1996 | 27 Jun 2002 | | April 1942 | 2-4-8 Nakayamasatsukidai, Takarazuka City, Hyogo, Japan |
| NAKASHIMA, Masahiro RESIGNED | Director | 17 Jan 1995 | 28 Oct 1999 | | March 1959 | 18 Shaftesbury Avenue, Kenton, Harrow, Middlesex, HA3 0QX |
| NISHIDA, Yasushi RESIGNED | Director | 30 Apr 2003 | 01 Sep 2007 | | November 1968 | Sumitomo Chemical (Uk) Plc, Horatio House, 77-85 Fulham Palace Road, London, W6 8JA |
| NISHIOKA, Fumio RESIGNED | Director | 20 Jun 2008 | 01 Jan 2013 | United Kingdom | April 1961 | Horatio House, Fulham Palace Road, 77-85, London, W6 8JA, United Kingdom |
| NOZAKI, Kunio RESIGNED | Director | 17 Jan 1995 | 04 Aug 1995 | | October 1956 | 8 Upcroft Avenue, Edgware, Middlesex, HA8 9RB |
| OKUNO, Takeo RESIGNED | Director | 20 Jun 2014 | 07 Apr 2020 | England | March 1958 | Hythe House, 200 Shepherds Bush Road, London, W6 7NL, United Kingdom |
| SHIBAYAMA, Hisashi RESIGNED | Director | 04 Aug 1995 | 08 Jul 1999 | | March 1963 | 21 Chalice Court, East End Road, London, N2 8NU |
| TAKADA, Shigeho RESIGNED | Director | 01 Jan 2018 | 01 May 2019 | Japan | August 1968 | Hythe House, 200 Shepherds Bush Road, London, W6 7NL |
| TAKAMI, Hisashi RESIGNED | Director | 29 Jul 2011 | 20 Jun 2014 | United Kingdom | January 1980 | Horatio House, 77-85 Fulham Palace Road, London, W6 8JA |
| TANIUCHI, Akira RESIGNED | Director | 01 May 2019 | 06 May 2022 | Japan | August 1961 | Hythe House, 200 Shepherds Bush Road, London, W6 7NL |
| TSUDA, Kosuke RESIGNED | Director | 26 Apr 1992 | 17 Jan 1995 | | January 1941 | Primrose Court 49-50 Prince Albert Road, London, NW8 7LD |
| TSUDA, Shigenori RESIGNED | Director | 30 Jun 2006 | 01 Dec 2008 | | February 1952 | Sumitomo Chemical (Uk) Plc, Horatio House 77-85 Fulham Palace Rd, London, W6 8JA |
| WADA, Hideo RESIGNED | Director | 01 Jan 2013 | 01 Apr 2015 | Japan | March 1962 | Hythe House, 200 Shepherds Bush Road, London, W6 7NL, United Kingdom |
| WADA, Hideo RESIGNED | Director | 28 Oct 1999 | 24 Jun 2005 | | March 1962 | C/O Sumitomo Chemical (Uk) Plc, Horatio House 77-85 Fulham Palace Rd, London, W6 8JA |
| YASUKAWA, Tsuyoshi RESIGNED | Director | 24 Jun 2005 | 20 Jun 2008 | | May 1952 | Horatio House, 77-85 Fulham Palace Road, London, W6 8JA |