Oct 1985 Established Nihon Space Soft Co., Ltd.; assumed office as Representative Director Dec 1986 Changed trade name to Nihon Knowledge Engineering Co., Ltd.; assumed office as Representative Director Jun 1988 Changed trade name to Nihon Knowledge Co., Ltd.; assumed office as Representative Director and President of the Company (current) Jun 2016 Assumed office as Chairman, IT Verification Industry Association (General Incorporated Association) Jun 2023 Assumed office as Auditor, IT Verification Industry Association Jun 2025 Assumed office as Honorary Chairman, IT Verification Industry Association (current)

Aug 2008 Joined NEC NetSI Service Co., Ltd. Oct 2011 Joined the Company Feb 2017 Assumed office as Representative Director, Wisteria Trust Co., Ltd. (current) Oct 2019 Assumed office as Deputy General Manager, Development Business Division Apr 2020 Assumed office as Executive Officer, General Manager of Sales Division Apr 2023 Assumed office as Senior Executive Officer, General Manager of Sales Headquarters Apr 2024 Assumed office as Senior Executive Officer, General Manager of Business Headquarters Jun 2024 Assumed office as Director, General Manager of Business Headquarters Apr 2026 Assumed office as Director, General Manager of Business Support Office (current)

May 1989 Joined the Company May 2012 Assumed office as Director Apr 2015 Assumed office as Director, General Manager of Technology Department, Development Business Division Jul 2019 Assumed office as Director, General Manager of Development Business Division Sep 2022 Assumed office as Director, General Manager of Business Headquarters Apr 2024 Assumed office as Director, General Manager of DX Promotion Headquarters Apr 2026 Assumed office as Director (current)

Apr 1977 Joined Nihon Denko Co., Ltd. (currently NEC Netsu SI Co., Ltd.) Jul 2001 Assumed office as Head of Finance Office, Accounting Department of the same company Oct 2007 Assumed office as General Manager, Audit Department of the same company Jun 2013 Assumed office as Full-time Corporate Auditor, Q&A Co., Ltd. Apr 2016 Joined the Company; assumed office as Advisor Jun 2016 Assumed office as Full-time Corporate Auditor of the Company Oct 2019 Assumed office as Director, General Manager of Administration Division (current)

Apr 1982 Joined Sharp Corporation Sep 1987 Joined Ricoh Co., Ltd. May 2007 Seconded to Ricoh Imaging Technology (Shanghai) Co., Ltd. as Head of Verification Department Apr 2011 Seconded to Ricoh IT Solutions Co., Ltd. Jun 2015 Joined IT Verification Industry Association (General Incorporated Association) Apr 2016 Ricoh IT Solutions Co., Ltd., IT Verification Service Division, Deputy General Manager Sep 2019 Joined the Company Apr 2021 Assumed office as General Manager, Internal Audit Office (current) Jun 2026 Scheduled to assume office as Director, Audit and Supervisory Committee Member

Apr 1992 Joined The Tokyo Bank, Ltd. (currently MUFG Bank, Ltd.) Oct 2001 Joined Tohmatsu Audit Corporation (currently Deloitte Touche Tohmatsu LLC) Oct 2005 Joined Azusa Audit Corporation (currently Azusa Audit LLC) Nov 2006 Joined Tohmatsu Audit Corporation (currently Deloitte Touche Tohmatsu LLC) Dec 2016 Assumed office as Full-time Corporate Auditor, Amazia Co., Ltd. (current) Nov 2022 Assumed office as Director of the Company (current) Dec 2023 Assumed office as Corporate Auditor, Cellid, Inc. (current) Jun 2026 Scheduled to assume office as Director, Audit and Supervisory Committee Member

Sep 2008 Registered as attorney-at-law (Daini Tokyo Bar Association); joined Ushijima Sogo Law Office Nov 2009 Joined Mirai Sogo Law Office Jan 2015 Assumed office as Partner, Mirai Sogo Law Office Jun 2019 Assumed office as Auditor, IT Verification Industry Association (current) Nov 2020 Assumed office as Corporate Auditor, C.O. Medical Co., Ltd. (current) Jun 2024 Assumed office as Corporate Auditor of the Company (current) Jun 2026 Scheduled to assume office as Director, Audit and Supervisory Committee Member