| KAWADA, Yoshikatsu ACTIVE | Director | 01 Apr 2024 | | Japan | May 1962 | 1st Floor, Building 1, Concorde Park, Maidenhead, Berkshire, SL6 4BY, England |
| SUGANUMA, Yukiaki ACTIVE | Director | 01 Nov 2023 | | Japan | August 1967 | 1st Floor, Building 1, Concorde Park, Maidenhead, Berkshire, SL6 4BY, England |
| TANAKA, Isao ACTIVE | Director | 01 Nov 2023 | | France | March 1968 | 1st Floor, Building 1, Concorde Park, Maidenhead, Berkshire, SL6 4BY, England |
| TANIMURA, Naoaki ACTIVE | Director | 01 Apr 2023 | | Japan | January 1965 | 1st Floor, Building 1, Concorde Park, Maidenhead, Berkshire, SL6 4BY, England |
| WOLKIND, Philip ACTIVE | Director | 19 Jun 2018 | | England | November 1969 | 1st Floor, Building 1, Concorde Park, Maidenhead, Berkshire, SL6 4BY, England |
| KAKIZAKI, Atsushi RESIGNED | Secretary | 03 Feb 2014 | 22 Sep 2014 | | | Sc House, Vanwall Business Park, Maidenhead, Berkshire, SL6 4UW |
| POWELL, Julie Ann RESIGNED | Secretary | 22 Sep 2014 | 25 Nov 2016 | | | S C House, Vanwall Road, Maidenhead, Berkshire, SL6 4UW |
| WHITBREAD, Kevin Richard RESIGNED | Secretary | 28 Aug 1991 | 03 Feb 2014 | | | 32, Crowthorne Road, Sandhurst, Berkshire, GU47 9EP |
| AKASHI, Kenta RESIGNED | Director | 01 Jul 2019 | 01 Apr 2023 | Japan | December 1969 | Sc House, Vanwall Business Park, Maidenhead, Berkshire, SL6 4UW |
| EDWARDS, David Simon RESIGNED | Director | 12 Apr 2018 | 24 Jul 2026 | England | April 1968 | 1st Floor, Building 1, Concorde Park, Maidenhead, Berkshire, SL6 4BY, England |
| FUKUI, Shinya RESIGNED | Director | 19 Jun 2018 | 01 Apr 2020 | England | May 1971 | Sc House, Vanwall Business Park, Maidenhead, Berkshire, SL6 4UW |
| HAGIWARA, Kenji RESIGNED | Director | 16 Sep 2009 | 27 May 2010 | | April 1957 | 582-12-A203, Hirado-Cho, Totsuka, Yokohama, Kanagawa, 244-0803, Japan |
| HAGIWARA, Kenji RESIGNED | Director | 10 Nov 2005 | 08 Feb 2008 | | April 1957 | 582-12-A203., Hirado-Cho. Totsuka, Yokohama, Kanagawa 244-0803, Japan |
| HAGIWARA, Kenji RESIGNED | Director | 01 Jun 2001 | 31 May 2005 | | April 1957 | 121 Princes Gardens, London, W3 0LR |
| HARNBY, David Anthony RESIGNED | Director | 01 Apr 2010 | 13 Oct 2017 | England | February 1962 | Sc House, Vanwall Road, Maidenhead, Berkshire, SL6 4UW, United Kingdom |
| HIROOKA, Naoto RESIGNED | Director | 08 Apr 2013 | 04 Nov 2016 | United Kingdom | March 1969 | Sc House, Vanwall Business Park, Maidenhead, Berkshire, SL6 4UW |
| ISHII, Shuntaro RESIGNED | Director | 06 Aug 2007 | 16 Sep 2009 | | August 1958 | 3-5, Naka-Ochiai, 4-Chome, Shinjuku-Ku, Tokyo 161-0032, FOREIGN, Japan |
| ISHIMARU, Teruyo RESIGNED | Director | 01 Apr 2022 | 01 Nov 2023 | Japan | May 1961 | Sc House, Vanwall Road, Maidenhead, SL6 4UW, England |
| ISHIMARU, Teruyo RESIGNED | Director | 01 Jun 2016 | 01 Oct 2017 | Japan | May 1961 | S C House, Vanwall Road, Maidenhead, Berkshire, SL6 4UW, United Kingdom |
| IWAMI, Kinya RESIGNED | Director | 20 Jan 2016 | 12 Apr 2018 | United Kingdom | June 1971 | Sc House, Vanwall Business Park, Maidenhead, Berkshire, SL6 4UW |
| KANAGAWA, Hiromi RESIGNED | Director | 01 Apr 2023 | 01 Nov 2023 | Japan | September 1962 | Sc House, Vanwall Road, Maidenhead, Berks, SL6 4UW, England |
| KANEKO, Atsushi RESIGNED | Director | 03 Aug 2016 | 01 Jul 2019 | England | September 1957 | Sc House, Vanwall Business Park, Maidenhead, Berkshire, SL6 4UW |
| KANEKO, Atsushi RESIGNED | Director | 16 Sep 2009 | 12 Jun 2012 | Japan | September 1957 | 1-11-45, Sumiyoshi, Soka, Saitama, 340-0014, Japan |
| KAWADA, Yoshikatsu RESIGNED | Director | 01 Apr 2021 | 01 Apr 2023 | Japan | May 1962 | Sc House, Vanwall Business Park, Maidenhead, Berkshire, SL6 4UW |
| KAWADA, Yoshikatsu RESIGNED | Director | 01 Oct 2017 | 01 Apr 2019 | Japan | May 1962 | Seiko Uk Limited, Sc House, Vanwall Road, Maidenhead, SL6 4UW, United Kingdom |
| KAWANISHI, Susumu RESIGNED | Director | 01 Aug 2013 | 07 Jan 2016 | England | May 1958 | Sc House, Vanwall Road, Maidenhead, Berkshire, SL6 4UW, United Kingdom |
| KUWABARA, Takabara RESIGNED | Director | 02 Jul 2001 | 30 Jun 2003 | | November 1938 | 15-2-701 Motonakayama 4- Chome, Funabashi-Shi, Chiba, 273-0035, Japan |
| MAEDA, Kunio RESIGNED | Director | 16 Jun 1999 | 02 Jul 2001 | | March 1942 | 3-29-7 Minamicho Hanakoganei, Kobairoshi, Tokyo, 1870003, 187-0003, Japan |
| MIKAMI, Seiichi RESIGNED | Director | 01 Apr 2008 | 27 May 2010 | | June 1956 | 2-9-13 Takara, Ichikawa - Shi, Chiba 272 - 0122, Japan |
| MIKAMI, Seiichi RESIGNED | Director | 13 Nov 2006 | 06 Aug 2007 | | June 1956 | 2-9-13 Takara, Ichikawa - Shi, Chiba 272 - 0122, Japan |
| MUTO, Takamitsu RESIGNED | Director | 16 Jun 1999 | 02 Jul 2001 | | September 1941 | 2-43-2 Higashi-Chou Kichjyoji, Musashino-Shi Tokyo 180-0002, Tokyo, FOREIGN, Japan |
| MUTO, Takamitsu RESIGNED | Director | | 05 May 1994 | | September 1941 | 111 Wolsey Road, Moor Park, Northwood, Middx, HA6 2EB |
| NAITO, Akio RESIGNED | Director | 01 Apr 2019 | 01 Apr 2021 | Japan | November 1960 | Sc House, Vanwall Business Park, Maidenhead, Berkshire, SL6 4UW |
| NAKAMURA, Yoshinobu RESIGNED | Director | 21 Jun 2004 | 01 Apr 2008 | | October 1949 | 1-24 Minami - Kamagaya 2 - Chome, Kamagaya - Shi, Chiba 273-0106, Japan |
| NAKAODA, Masato RESIGNED | Director | 08 Feb 2008 | 16 Sep 2009 | | July 1953 | 1-75-1408 Yato-Cho, 2-Chome, Nishi Tokyo, Tokyo 188-0001, FOREIGN, Japan |
| OGURO, Tomohiro RESIGNED | Director | 02 Jul 2001 | 21 Jun 2004 | | March 1943 | 17-6 Utsukushigaoka, 3 Chome Aoba Ku Yokohama-Shi, Kanagawa, 225-0002, Japan |
| OUCHI, Hiroyuki RESIGNED | Director | 31 May 2005 | 01 Aug 2013 | Great Britain | September 1959 | Flat 16 Abbotsbury House, Abbotsbury Road, London, W14 8EN, Great Britain |
| SAITO, Takayoshi RESIGNED | Director | | 23 Mar 1998 | | July 1933 | Seiko Corporation, 6-21 Kyobashi 2 Chome Chuo-Ku, Tokyo 104, FOREIGN, Japan |
| SATO, Hisao RESIGNED | Director | 21 Jun 2004 | 13 Nov 2006 | | December 1955 | 6-15 Naka - Kaigan 2 - Chome, Chigasaki - Shi, Kanagawa 253-0055, Japan |
| SHOYAMA, Masahiko RESIGNED | Director | 12 Jun 2012 | 01 Jun 2016 | Japan | August 1956 | Sc House, Vanwall Road, Maidenhead, Berkshire, SL6 4UW, England |
| SUENAGA, Kimiharu RESIGNED | Director | 08 May 2006 | 29 Apr 2013 | Germany | December 1960 | Flat 53, Kensington West, Blythe Road, London, W14 0JG, England |
| SUZUKI, Akira RESIGNED | Director | 28 Apr 1994 | 01 Jun 2001 | | May 1942 | Flat 12, 49 Rutland Gate, London, SW7 1PL |
| TAKAGI, Haruhiko RESIGNED | Director | 01 Apr 2004 | 02 Oct 2004 | | January 1959 | 2 The Croft, Park Hill Ealing, London, W5 2JW |
| TAKENAKA, Shusuke RESIGNED | Director | 23 Mar 1998 | 16 Jun 1999 | | January 1938 | 4-7-2 Chiyogaoka Aso-Ku, Kawasaki-Shi, Kanagawa, Japan |
| TANAKA, Shunji RESIGNED | Director | 12 Jun 2012 | 01 Jun 2016 | Japan | October 1955 | Sc House, Vanwall Business Park, Maidenhead, Berkshire, SL6 4UW |
| TANAKA, Shunji RESIGNED | Director | 30 Sep 2000 | 15 Jun 2003 | | October 1955 | Am Pfarrgarten 31, Meerbusch, Nordrhein Westfalen 40667, Germany |
| TODAKA, Toyoji RESIGNED | Director | 16 Sep 2009 | 12 Jun 2012 | Uk | February 1959 | Apartment 125, Hepworth Court 30, Gatliff Road, London, SW1W 8QP |
| UMEMOTO, Hirohiko RESIGNED | Director | 27 May 2010 | 01 Jun 2016 | Japan | November 1951 | Sc House, Vanwall Business Park, Maidenhead, Berkshire, SL6 4UW |
| WADA, Tsukasa RESIGNED | Director | | 01 Oct 1993 | | October 1941 | 43 Green End Road, Chiswick, London, W4 1AH |
| WAKUYAMA, Takashi RESIGNED | Director | 02 Jul 2001 | 16 Sep 2009 | | May 1948 | 1-42-9 Higiriyama Totsuka, Yokohaiwa, Kanagawa, 233-0015, Japan |
| WEARE, James Albert RESIGNED | Director | | 30 Mar 2007 | | May 1941 | 15 Highgrove Park, Maidenhead, Berkshire, SL6 7PQ |
| WILSON, Robert RESIGNED | Director | 01 Apr 2004 | 31 Mar 2016 | England | July 1954 | Sc House, Vanwall Business Park, Maidenhead, Berkshire, SL6 4UW |
| YONEYAMA, Taku RESIGNED | Director | 01 Jun 2016 | 01 Apr 2023 | Japan | November 1962 | S C House, Vanwall Road, Maidenhead, Berkshire, SL6 4UW, United Kingdom |