Directors | Investor Relations

(As of the end of June 2025)

Koichi Suzuki

Date of birth: September 3, 1946

Career & current positions in and outside IIJ

December 1992 Director at the time of the establishment of IIJ
April 1994 President, Representative Director and Chief Executive Officer ("CEO") of IIJ
June 2013 Chairman of the Board, Representative Director and CEO of IIJ
April 2021 Chairman of the Board, Representative Director and Co-CEO of IIJ
April 2024 Member of the Board, Representative Director, Chairman and Co-CEO of IIJ (current position)

Important concurrent posts

Chairman of the Board, Representative Director of IIJ Engineering Inc.
Chairman of the Board of IIJ America Inc.
President and Representative Director of INTERNET MULTIFEED CO.
Representative Director and Chairman of JOCDN Inc.

Number of Shares Owned(*)

7,415,215

Yasuhiko Taniwaki

Date of birth: September 11, 1960

Career & current positions in and outside IIJ

April 1984 Joined the Ministry of Posts and Telecommunications (now, the Ministry of Internal Affairs and Communications ("MIC"))
June 2013 Deputy Director-General for the National Center of Incident Readiness and Strategy for Cybersecurity (NISC) and Councilor for the Cabinet Secretariat
June 2016 Director-General of the Global ICT Strategy Bureau, MIC
July 2017 Director-General for Information Security, MIC
July 2018 Director-General of the Telecommunications Bureau, MIC
December 2019 Vice-Minister for Policy Coordination of Posts and Telecommunications, MIC
March 2021 Resigned from MIC
January 2022 Advisor of IIJ
June 2022 Executive Vice President and Director of IIJ
April 2024 Member of the Board, Executive Vice President of IIJ
April 2025 Member of the Board, Representative Director, President and Co-CEO & COO of IIJ (current position)

Number of Shares Owned(*)

6,112

Satoshi Murabayashi

Date of birth: November 8, 1958

Career & current positions in and outside IIJ

April 1981 Joined The Sanwa Bank, Ltd. (currently MUFG Bank, Ltd.)
June 2007 Executive Officer of The Bank of Tokyo-Mitsubishi UFJ, Ltd. (currently MUFG Bank, Ltd.)
June 2013 Managing Director of the same
May 2015 Senior Managing Director of the same
June 2015 Senior Managing Corporate Executive of Mitsubishi UFJ Financial Group, Inc.
June 2017 President and Representative Director of Mitsubishi UFJ Research and Consulting Co., Ltd.
June 2021 Executive Vice President and Director of IIJ
April 2022 President and Representative Director of DeCurret Holdings Inc. (current position)
April 2024 Member of the Board, Executive Vice President of IIJ (current position)

Important concurrent posts

President and Representative Director of DeCurret Holdings, Inc.

Number of Shares Owned(*)

8,914

Koichi Kitamura

Date of birth: May 12, 1954

Career & current positions in and outside IIJ

April 1978 Joined Nippon Steel Corporation
June 2004 Director of NS Solutions Corporation
April 2009 Executive Director of the same
April 2012 Managing Executive Director of the same
June 2016 Director & Vice-president Operating Officer of the same
April 2020 Senior Managing Executive Officer and Deputy Unit Director of Business Unit of IIJ
April 2021 Senior Managing Executive Officer and Business Unit Director of IIJ
June 2021 Senior Managing Director and Business Unit Director of IIJ
April 2024 Member of the Board, Senior Managing Executive Officer and Business Unit Director of IIJ
April 2025 Member of the Board, Executive Vice President of IIJ (current position)

Number of Shares Owned(*)

13,484

Akihisa Watai

Date of birth: September 30, 1965

Career & current positions in and outside IIJ

April 1989 Joined Sumitomo Bank, Ltd. (currently Sumitomo Mitsui Banking Corporation)
August 1996 Temporarily seconded to IIJ
February 2000 Joined IIJ
June 2004 Director and Chief Financial Officer ("CFO") of IIJ
April 2010 Managing Director and Chief Financial Officer of IIJ
April 2015 Division Director of Financial Division of IIJ (current position)
April 2021 Senior Managing Director and Chief Financial Officer of IIJ
April 2024 Member of the Board, Senior Managing Executive Officer and CFO of IIJ
April 2025 Member of the Board, Executive Vice President and CFO of IIJ (current position)

Number of Shares Owned(*)

71,046

Junichi Shimagami

Date of birth: April 17, 1967

Career & current positions in and outside IIJ

April 1990 Joined Nomura Research Institute, Ltd.
September 1996 Joined IIJ
June 2007 Director of IIJ
April 2010 Executive Managing Officer of IIJ
April 2015 Senior Executive Officer, Division Director of Network Division and Chief Technology Officer ("CTO") of IIJ
June 2015 Director and CTO of IIJ
April 2016 Technology Unit Director of IIJ (current position)
June 2020 Managing Director and CTO of IIJ
April 2024 Member of the Board, Senior Managing Executive Officer and CTO of IIJ
April 2025 Member of the Board, Executive Vice President and CTO of IIJ (current position)

Number of Shares Owned(*)

53,834

Takashi Tsukamoto

Date of birth: August 2, 1950

Outside Independent

Career & current positions in and outside IIJ

April 1974 Joined The Dai-Ichi Kangyo Bank, Ltd. (currently Mizuho Bank, Ltd.
April 2004 Managing Executive Officer (Head of EMEA) of Mizuho Corporate Bank, Ltd.
April 2009 President and CEO of Mizuho Financial Group, Inc.
June 2011 President and CEO of Mizuho Bank, Ltd. Chairman of Mizuho Financial Group, Inc.
July 2013 Chairman of Mizuho Bank, Ltd.
April 2014 Senior Advisor of Mizuho Financial Group, Inc.
April 2017 Honorary Advisor of Mizuho Financial Group
June 2017 Member of the Board of IIJ (current position)
July 2023 Senior Advisor of Mizuho Financial Group, Inc. (current position)

Number of Shares Owned(*)

13,600

Kazuo Tsukuda

Date of birth: September 1,1943

Outside Independent

Career & current positions in and outside IIJ

April 1968 Joined Mitsubishi Heavy Industries, Ltd.
June 1999 Director of the same
April 2002 Managing Director of the same
June 2003 President and Representative Director of the same
April 2008 Chairman of the Board, Representative Director of the same
April 2013 Chief Executive Adviser of the same
June 2019 Special Advisor of the same
June 2020 Member of the Board of IIJ (current position)
June 2021 Honorary Advisor of Mitsubishi Heavy Industries, Ltd.

Number of Shares Owned(*)

3,600

Yoichiro Iwama

Date of birth: September 15, 1943

Outside Independent

Career & current positions in and outside IIJ

April 1967 Joined Tokio Marine and Fire Insurance Co., Ltd (currently Tokio Marine and Nichido Fire Insurance Co., Ltd.)
June 1996 Director of the same
April 2005 Senior Managing Director of the same
June 2005 President and Representative Director of Tokio Marine Asset Management Co., Ltd.
June 2010 Chairman of Japan Securities Investment Advisers Association (currently Japan Investment Advisers Association)
May 2018 Outside Director and Chairman of the Board of Nikko Asset Management Co., Ltd. (current position)
June 2021 Member of the Board of IIJ (current position)

Important concurrent posts

Outside Director and Chairman of the Board of Nikko Asset Management Co., Ltd.

Number of Shares Owned(*)

3,700

Atsushi Okamoto

Date of birth: March 26, 1954

Outside Independent

Career & current positions in and outside IIJ

April 1977 Joined Iwanami Shoten, Publishers
April 2008 Division Manager of Production Department of the same
June 2010 Director of the same
June 2013 President and CEO of the same
June 2022 Member of the Board of IIJ (current position)

Number of Shares Owned(*)

2,200

Kaori Tonosu

Date of birth: December 24, 1961

Outside Independent

Career & current positions in and outside IIJ

April 1985 Joined the Fuji Bank, Limited (currently Mizuho Bank, Ltd.)
June 2001 Joined Tohmatsu & Co. (currently Deloitte Touche Tohmatsu LLC)
June 2006 Partner of the same
November 2015 Board member of Deloitte Tohmatsu LLC
June 2018 Board member of Deloitte Touche Tohmatsu LLC
June 2022 Director of JAPAN POST INSURANCE Co., Ltd. (current position)
June 2022 Member of the Board of IIJ (current position)

Number of Shares Owned(*)

700

(*)The number of shares owned as of March 31, 2025.

Integrated Report Portal