Apr 2002 Joined TIS Inc. Oct 2008 Joined Hatena Co., Ltd. Jul 2012 Group Producer, Fourth Group, Hatena Co., Ltd. Aug 2013 General Manager, Second Service Development Division, Hatena Co., Ltd. Feb 2014 General Manager, Service Development Division, Hatena Co., Ltd. Jul 2014 Director, Hatena Co., Ltd. Aug 2014 Representative Director, President, Hatena Co., Ltd. (current)

Sep 2001 Joined Hatena Co., Ltd. Jun 2006 Chief Engineer, Hatena Co., Ltd. Jul 2011 Hatena Blog Director, Hatena Co., Ltd. Feb 2013 Group Producer, Fifth Group, Hatena Co., Ltd. Aug 2014 Executive Officer, General Manager, Service Development Division, Hatena Co., Ltd. Aug 2016 Executive Officer, General Manager, Service and System Development Division, Hatena Co., Ltd. Oct 2020 Director, General Manager, Service and System Development Division, Hatena Co., Ltd. May 2022 Director, General Manager, Organization and Infrastructure Development Division, Hatena Co., Ltd. Apr 2025 Director, General Manager, Content Division, Hatena Co., Ltd. (current)

Jun 2000 Joined Andersen Consulting Co., Ltd. (now Accenture Japan Ltd.) May 2004 Joined Hatena Co., Ltd. Dec 2009 Executive Officer, Hatena Co., Ltd. Aug 2017 Executive Officer, General Manager, Corporate Division, Hatena Co., Ltd. Oct 2020 Director, General Manager, Corporate Division, Hatena Co., Ltd. (current)

Mar 1996 Joined U.S. Education Network Co., Ltd. (now Avitas Inc.) Apr 1998 Director, U.S. Education Network Co., Ltd. Jan 2000 Director, CareerAccess Inc. Nov 2001 Director, Optima Inc. Apr 2007 Executive Officer, I-REP Inc. Oct 2007 Director, Aikea Inc. Oct 2010 Joined Hatena Co., Ltd. Nov 2010 Director, General Manager, Business Development Division, Hatena Co., Ltd. Feb 2011 Vice President and Director, General Manager, Business Development Division, Hatena Co., Ltd. Aug 2014 Director, General Manager, Business Development Division, Hatena Co., Ltd. Oct 2020 Director (part-time), Hatena Co., Ltd. (current) Oct 2022 Outside Director, Photoraction Inc. (current) May 2024 Outside Director, BENLY Inc. (current) Aug 2024 Outside Director, Peace Tech Lab Inc. (now Alice Style Inc.) (current)

Jul 2001 Established Yugen Kaisha Hatena (now Hatena Co., Ltd.) Feb 2004 Representative Director, President, Hatena Co., Ltd. Aug 2014 Representative Director, Chairman, Hatena Co., Ltd. Oct 2017 Representative Director, President, OND Inc. (current) Oct 2017 Director (part-time), Hatena Co., Ltd. (current) Feb 2022 Outside Director, Ichisatsu Inc. (current)

Jan 1992 Marketing Strategist, Barclays Global Investors Jul 1999 Representative Director, President, Optmail Inc. Aug 2002 Senior Business Product Manager, Google Inc. May 2007 Trustee, University of California, Berkeley Foundation Jun 2010 Mentor, AngelPad Jul 2011 Director, Hatena Co., Ltd. (current)

Dec 1983 Joined Nomura Research Institute, Ltd. Jun 1992 Senior Research Fellow, Nomura Research Institute, Ltd. Jun 2002 Advisor, Yasashii Te Co., Ltd. Oct 2003 Full-time Audit & Supervisory Board Member, Yasashii Te Co., Ltd. May 2009 Advisor, Charle Co., Ltd. Jun 2009 Full-time Audit & Supervisory Board Member, Charle Co., Ltd. Jul 2013 Advisor, Hatena Co., Ltd. Oct 2013 Full-time Audit & Supervisory Board Member, Hatena Co., Ltd. (current)

Dec 1983 Joined Sanwa Audit Corporation Tokyo Marunouchi Office (now Deloitte Touche Tohmatsu LLC) Apr 1987 Established Katsunori Nakamura Tax Accountant Office, Principal (current) Feb 2003 Established Katsunori Nakamura Certified Public Accountant Office, Principal May 2003 Outside Audit & Supervisory Board Member, TSS Link Inc. Aug 2004 Established Citia Certified Public Accountants Joint Office, Co-Representative (current) Jun 2012 Outside Audit & Supervisory Board Member, Mars Engineering Corporation (now Mars Group Holdings Corporation) Oct 2012 Audit & Supervisory Board Member, Hatena Co., Ltd. (current) Jun 2015 Outside Director, Mars Engineering Corporation (now Mars Group Holdings Corporation) May 2017 Outside Audit & Supervisory Board Member, Sanko-sha Inc. May 2017 Outside Audit & Supervisory Board Member, K.T. Arrows Inc. Jun 2017 Outside Audit & Supervisory Board Member, Genomembrane Inc. (current) May 2021 Outside Audit & Supervisory Board Member, Opti Inc. (current) May 2022 Outside Director (Audit and Supervisory Committee Member), AS Kikaku Sekkei Inc. Jun 2024 Auditor, Fujimoto Ikuei Foundation (current)

Oct 2005 Joined Yamamoto Sogo Law Office (now Yamamoto Shibasaki Law Office) May 2006 Joined White & Case LLP Oct 2013 Member, Naemura Law Office LPC (now Kotora Chuo Law Office LPC) Sep 2014 Part-time Lecturer, Rikkyo University Nov 2014 Director, T&C Consulting Inc. Mar 2015 Auditor, Save the Children Japan May 2015 Audit & Supervisory Board Member, Hatena Co., Ltd. (current) Jun 2016 Outside Audit & Supervisory Board Member, ZUU Inc. Jun 2016 Auditor, Joshuikai Foundation Sep 2016 Outside Audit & Supervisory Board Member, D.L.E. Inc. Dec 2016 Partner, King & Wood Mallesons (Foreign Law Joint Enterprise) Sep 2018 Auditor, Social Change Promotion Organization (general incorporated foundation) Oct 2018 Outside Director (Audit and Supervisory Committee Member), Net Protections Holdings Inc. (current) Jan 2019 Partner, Sou Sato Law Office (current) Jun 2020 Auditor, Hitotsubashi University Support Association (public interest foundation) (current) Nov 2021 Outside Director (Audit and Supervisory Committee Member), Coconala Inc. Apr 2024 Outside Audit & Supervisory Board Member, Topaz Regional Partners Inc. (current) Jun 2025 Outside Director, GENOVA Inc. (current) Jun 2025 Outside Director (Audit and Supervisory Committee Member), KIT Inc. (current)