Companies/JP/4043

TOKUYAMA CORPORATION · 株式会社トクヤマ

Executives 5Directors 10Avg age 64Avg tenure 3y

Hiroshi Yokota

Chairman

Age 64Since 2026-03-31

Executives5

Age 61Since 2026-03-31

Yoshinori Kashiwabara

Director of Finance/CFO

Yasutake Tsurumi

Chief Administrative Officer

Takahide Taniguchi

Human Resources Officer

Age 64Since 2025-05-31

Fumiaki Iwasaki

Chief Tech/Sci/R&D Officer

Age 66Since 2020-03-31

Board of directors10

Youji Miyamoto

Director/Board Member

Age 68Since 2017-05-31

Kazumasa Sueoka

Director/Board Member

Age 59Since 2025-05-31

Hiroshi Yokota

Chairman

Age 64Since 2026-03-31

Fumiaki Iwasaki

Director/Board Member

Age 66Since 2020-05-31

Nobuko Mizumoto

Director/Board Member

Age 69Since 2021-06-24

Director/Board Member

Age 61Since 2023-05-31

Kei Ishizuka

Director/Board Member

Age 65Since 2023-05-31

Naoki Kondo

Director/Board Member

Age 52Since 2023-05-31

Shareholders5

Name	Stake	Shares
Nomura Asset Management Co., Ltd.	5.484 %	3,953,600
Sumitomo Mitsui DS Asset Management Co., Ltd.	3.36 %	2,421,900
Nippon Life Insurance Co.	3.016 %	2,174,000
Amova Asset Management Co., Ltd.	2.668 %	1,923,000
YAMAGUCHI FINANCIAL GROUP, INC.	2.085 %	1,503,000

Catalog · 2026-07-09

Registry officers17

Name	Role	Since	Shares
Fumiaki Iwasaki	Chief Tech/Sci/R&D Officer	2020-03-31	-
Yasutake Tsurumi	Chief Administrative Officer	—	-
Yoshinori Kashiwabara	Director of Finance/CFO	—	-
Takahide Taniguchi	Human Resources Officer	2025-05-31	-
Tomohiro Inoue	President	2026-03-31	-
井上智弘	代表取締役社長執行役員	2021-04-01	-
宮本陽司	取締役（監査等委員長）	2013-06-01	-
岩崎史哲	取締役専務執行役員	2017-04-01	-

Registry · as of 2026-07-09