Notice of Executive Officer Appointments

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TOKYO - March 26, 2026 - Internet Initiative Japan Inc. (TSE Prime: 3774), one of Japan's leading Internet access and comprehensive network solutions providers, today announced the following Executive Officer appointments, as resolved at the Board of Directors meeting held this day, March 26, 2026.

Executive Officers

New appointments (as of April 1)

New title	Name	Current title
Executive Officer	Kenichiro Hayashi	Division Director of Service Product Business Division, Marketing Management Unit
Executive Officer	Hideki Yamaya	In charge of West Japan Business Division 1 and Division 2

New appointments (as of May 1)

New title	Name
Senior Managing Executive Officer	Toshiki Ochi
Current title: Managing Corporate Executive and Group CIO, Mitsubishi UFJ Financial Group; Member of the Board of Directors, Managing Executive Officer and CIO, MUFG Bank, Ltd.

• Note: Current Member of the Board Satoshi Murabayashi will retire from his position as Executive Vice-President on March 31, 2026. Then on June 26, upon conclusion of the Ordinary General Meeting of Shareholders, he will retire as Member of the Board, having reached the end of his term. He continues to serve as President and Representative Director of DeCurret Holdings, Inc., and as of April 1 will become Representative Director, Chairman and CEO of DeCurret DCP Inc.
• Note: Current Executive Officers Masami Kawamata and Kaori Kawakami will retire as of March 31, 2026.

The career history of the newly appointed Senior Managing Executive Officer is as follows.

Name

Career History

Toshiki Ochi (b. 1968)

April 1991: Joined The Sanwa Bank, Ltd. June 2018: Executive Officer, Mitsubishi UFJ Financial Group; Executive Officer, MUFG Bank, Ltd. April 2019: Managing Executive Officer, Mitsubishi UFJ NICOS Co., Ltd. April 2022: Managing Corporate Executive, Mitsubishi UFJ Financial Group (current position); Managing Executive Officer, Mitsubishi UFJ Bank, Ltd. June 2022: Member of the Board of Directors, Managing Executive Officer, MUFG Bank, Ltd. (current position)

Reference

IIJ’s planned management organization as of June 26, 2026, is as follows.

Board Members

Position	Name
Member of the Board, Representative Director	Koichi Suzuki
Member of the Board, Representative Director	Yasuhiko Taniwaki
Member of the Board	Koichi Kitamura
Member of the Board	Akihisa Watai
Member of the Board	Junichi Shimagami
Member of the Board (part-time)	Takashi Tsukamoto(*1) (Senior Advisor of Mizuho Financial Group, Inc)
Member of the Board (part-time)	Kazuo Tsukuda(*1) (Former President and Representative Director of Mitsubishi Heavy Industries, Ltd.)
Member of the Board (part-time)	Yoichiro Iwama(*1) (Outside Director and Chairman of the Board of Amova Asset Management Co., Ltd.)
Member of the Board (part-time)	Atsushi Okamoto(*1) (Former President and CEO of Iwanami Shoten, Publishers)
Member of the Board (part-time)	Kaori Tonosu (*1) (Director of JAPAN POST INSURANCE Co., Ltd., Former Board Member of Deloitte Touche Tohmatsu LLC)

• (*1)Independent Outside Directors

Company Auditors

Position	Name
Company Auditor	Masayoshi Tobita
Company Auditor	Masako Tanaka
Company Auditor (part-time)	Kumiko Aso (*2) (Certified Public Accountant)
Company Auditor (part-time)	Shio Harada (*2) (Attorney at law; newly appointed)

• (*2)Outside Company Auditors

• Note: Current Company Auditor Takashi Michishita will retire upon conclusion of the Ordinary General Meeting of Shareholders of June 26.

The career history of the newly appointed Corporate Auditor is as follows.
Shio Harada (b. 1974)
March 1997: Graduated from The University of Tokyo, Faculty of Law
April 2000: Registered as an attorney at law (Daini Tokyo Bar Association), and joined Minori Sogo Law Offices
August 2012: Established Shiki-no-Kaze Law Group

Executive Officers

Position	Name	Responsibility
Chairman	Koichi Suzuki	Co-CEO
President	Yasuhiko Taniwaki	Co-CEO & COO; direct control of organizations under the direct control of management
Executive Vice President	Koichi Kitamura	In charge of sales, integration and global-related organizations, in charge of Marketing Management Unit (Joint), Unit Manager of Enterprise Sales Unit
Executive Vice President	Akihisa Watai	CFO; in charge of administration-related organizations, Unit Manager of Corporate Strategy Unit, Unit Manager of Finance Unit
Executive Vice President	Junichi Shimagami	CTO; in charge of technology-related organizations, in charge of Marketing Management Unit (Joint)
Senior Managing Executive Officer	Tadashi Kawashima	Executive of Special Mission
Senior Managing Executive Officer	Naoshi Yoneyama	CIO; in charge of Administrative Unit (Joint), Unit Manager of Administrative Unit, Representative Director and President of JOCDN Inc.
Senior Managing Executive Officer	Toshiki Ochi (newly appointed)	In charge of Administrative Unit, Risk Management Unit, and Financial Sales Unit (Joint)
Managing Executive Officer	Makoto Ajisaka	Unit Manager of Alliance Sales Unit, Unit Manager of Marketing Management Unit
Managing Executive Officer	Yoshikazu Yamai	Unit Manager of Network Services Business Unit, Representative Director and President of IIJ Engineering Inc.
Managing Executive Officer	Koichi Maruyama	In charge of Global Business Unit
Managing Executive Officer	Masakazu Tachikui	Executive of Special Mission
Managing Executive Officer	Akira Sumiya	In charge of Risk Management Unit (Joint), Unit Manager of Risk Management Unit, CISO, CRO, CPO (*3)
Managing Executive Officer	Takenori Onishi	In charge of domestic branches, Deputy Unit Manager of Enterprise Sales Unit
Managing Executive Officer	Shigeo Yabuki	Unit Manager of Mobile Services Business Unit
Managing Executive Officer	Ken Araki	In charge of Financial Sales Unit (Joint), Unit Manager of Financial Sales Unit, Deputy Unit Manager of Enterprise Sales Unit
Managing Executive Officer	Hajime Shironouchi	Deputy Unit Manager of Network Services Business Unit, Division Director of Network Division, in charge of Broadcasting Systems Division, General Manager of Telecommunications Facilities
Managing Executive Officer	Takahiro Ide	Deputy Unit Manager of Enterprise Sales Unit, Division Director of Central Japan Business Division
Managing Executive Officer	Naoshi Someya	In charge of AI Implementation Task Force, Deputy Unit Manager of Network Services Business Unit, Division Director of Cloud Division
Managing Executive Officer	Takahiko Hiyama	Deputy Unit Manager of Finance Unit
Executive Officer	Hiroo Shirasaki	Division Director of System Development Division, Network Services Business Unit
Executive Officer	Takeshi Hatano	Unit Manager of Government Public & Educational Organization Sales Unit
Executive Officer	Mamoru Saito	Division Director of Advanced Security Division, Network Services Business Unit
Executive Officer	Kentaro Kurosawa	Division Director of Service Administration Division, Network Services Business Unit
Executive Officer	Kaichiro Naka	In charge of Integration Business Unit, Unit Manager of Integration Business Unit
Executive Officer	Kenichiro Hayashi (newly appointed)	Division Director of Service Product Business Division, Marketing Management Unit
Executive Officer	Hideki Yamaya (newly appointed)	In charge of West Japan Business Division 1 and Division 2

• (*3)CISO: Chief Information Security Officer; CRO: Chief Risk Officer; CPO: Chief Privacy Officer

The statements within this release contain forward-looking statements about our future plans that involve risk and uncertainty. These statements may differ materially from actual future events or results.

For inquiries, contact

IIJ Corporate Communications

• +81-3-5205-6310
• +81-3-5205-6377
• press@iij.ad.jp

• (*)All company, product, and service names used in this press release are the trademarks or registered trademarks of their respective owners.