Apr 1983 Joined Hitachi Metals, Ltd. (current name: Proterial, Ltd.) Jun 1992 Visiting Researcher, Applied Physics Research Institute, Stanford University Apr 1996 Joined National Institute for Materials Science (formerly Independent Administrative Institution National Institute for Materials Science) Oct 2000 Founded the Company; Representative Director, President Mar 2023 Chairman, Raicol Crystals Ltd. May 2024 Representative Director, Chairman of the Company Dec 2024 Representative Director, President, Oxide Power Crystal Co., Ltd. (current) May 2026 Representative Director, CEO of the Company (current)

Apr 1990 Joined Shoko Chukin Bank, Ltd. Dec 2007 Director and Vice President of the Company May 2024 Representative Director, President of the Company May 2026 Representative Director, COO of the Company (current)

Apr 1985 Joined Nippon Telegraph and Telephone Corporation (current name: NTT, Inc.) Sep 1996 Visiting Researcher, Applied Physics Research Institute, Stanford University Jul 2010 Director, Nippon Telegraph and Telephone Corporation Jul 2012 Joined NTT Advanced Technology Corporation Dec 2017 Director of the Company May 2024 Vice President and Director of the Company May 2026 Director, CTO of the Company (current)

May 2004 Joined Daiwa Securities SMBC Co. Ltd. (current name: Daiwa Securities Co. Ltd.) Jun 2006 Joined Deutsche Securities Inc. Sep 2011 Joined Citigroup Securities Co., Ltd. Oct 2014 Joined Citigroup Global Markets Asia Limited Jul 2017 General Manager, IPO Preparation Office, the Company May 2021 Director of the Company Mar 2023 CSO, Raicol Crystals Ltd. Apr 2026 Outside Director, Kishun Co., Ltd. (current) May 2026 Director, CSO of the Company (current)

Mar 1991 Joined Kosai Kogei Co., Ltd. (current name: Kosai Co., Ltd.) Apr 2010 Managing Director, Kosai Kogei Co., Ltd. Dec 2018 Joined the Company Jun 2021 General Manager, Administration Division, the Company May 2024 Full-time Corporate Auditor of the Company (current)

Dec 1984 Registered as Certified Tax Accountant Feb 1990 Registered as Certified Public Accountant Mar 1991 Founded Actus Audit Corporation (current name: Taiyo LLC); Representative Partner Oct 2005 Outside Corporate Auditor of the Company (current) Jun 2006 Corporate Auditor, Shin-Etsu Chemical Co., Ltd. (current) Jul 2009 Founded Hiyu Tax Corporation; Representative Partner Oct 2014 Partner, Taiyo LLC Jul 2015 Representative Partner, Kisaragi Audit Corporation (current name: Moore Mirai Audit Corporation)

Apr 1989 Joined Nippon Telegraph and Telephone Corporation (current name: NTT, Inc.) Oct 2006 General Manager, Information Strategy, Planning Department, NTT Advanced Technology Laboratories, Nippon Telegraph and Telephone Corporation Jan 2015 Head, Technology Export Control Office, Management Planning Department, NTT Advanced Technology Corporation Mar 2017 Corporate Auditor, Yokohama Biotechnology Co., Ltd. Apr 2017 Professor, Growth Strategy Education and Research Center, Organization for Regional Collaboration, Yokohama National University May 2020 Outside Director of the Company (current) Jun 2021 Corporate Auditor, UNTRACKED Inc. (current) Mar 2024 Representative Director, Vice President, The Japan Society of Applied Physics Apr 2024 Deputy Director, Center for Semiconductor and Quantum Integrated Electronics, Institute for Advanced Academic Research, Yokohama National University (current) Apr 2026 IMS Visiting Professor, Institute for Advanced Academic Research, Yokohama National University (current)

May 1978 Joined Gooch & Housego Ltd. Mar 1986 Technical Director, Gooch & Housego Ltd. May 1995 Managing Director, Gooch & Housego Ltd. Mar 2001 Partner, MTI Partners Ltd. Jan 2003 Chief Executive Officer, Gooch & Housego PLC Jan 2015 Non-Executive Chairman, Gooch & Housego PLC May 2024 Outside Director of the Company (current)

Apr 1989 Joined NTT Advanced Technology Corporation Jun 2023 Director (part-time), NTT-AT Systems Corporation (current) Director (part-time), NTT-AT Techno Communications Corporation (current) Director (part-time), NTT-AT IPS Corporation (current) Director (part-time), NTT-AT Creative Corporation (current) Director (part-time), NTT-AT Mtac Corporation (current) Jul 2024 Department Manager, Business Planning Department, Business Strategy Office, NTT Advanced Technology Corporation (current) May 2025 Outside Director of the Company (current)

Sep 2007 Registered as Attorney-at-Law Sep 2009 Joined Tonika Law Office (current) Jun 2019 Outside Director, Dainikka Co., Ltd. (current) Apr 2023 Instructor, Legal Training and Research Institute of the Supreme Court of Japan May 2024 Outside Corporate Auditor of the Company (current)