H-ONE CO., LTD.

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Board Members

(As of June 25, 2025)

Directors

Representative Director
Seiki Mayumi Seiki Mayumi Career
Director
Masamichi Okuda Masamichi Okuda Career
Outside Director
Keiichiro Maruyama Keiichiro Maruyama Career
Outside Director
Kunihiro Todokoro Kunihiro Todokoro Career
Outside Director
Akiko Yamada Akiko Yamada Career

Audit & Supervisory Board Members

Audit & Supervisory Board Member
Kazuo Yamashita Kazuo Yamashita Career
Audit & Supervisory Board Member (Outside)
Hiroyuki Kawai Hiroyuki Kawai Career
Audit & Supervisory Board Member (Outside)
Hiroki Murakami Hiroki Murakami Career

Operating Officers

President,
Chief Executive Officer
Seiki Mayumi
Executive Vice President,
Executive Officer
Masamichi Okuda
Managing Officer Yosuke Suwa
Managing Officer Masayuki Tanabe
Managing Officer Chris Millice
Senior Operating Officer Tatsuya Kawaguchi
Senior Operating Officer Hajime Sawaki
Senior Operating Officer Yoji Saito
Senior Operating Officer Taiji Miyamoto
Senior Operating Officer Takaharu Kato
Senior Operating Officer Shane Hall
Operating Officer Hiroyuki Takebe
Operating Officer Teruo Ootake
Operating Officer Kenichi Miyamura
Operating Officer Masaya Nagata
Operating Officer Tamotsu Kamei
Operating Officer Ryuichi Nojiri
Operating Officer Yoshiaki Tsuchino
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