Japan Steel Works : Notice Concerning Change of Officers

Published February 9, 2026 at 6:35 a.m. UTC

Source: MarketScreener

DISCLAIMER: This document has been translated from the Japanese original for reference purposes only. In the event of any discrepancy between this translated document and the Japanese original, the original shall prevail.

To whom it may concern

Company name: The Japan Steel Works, Ltd. Name of representative: Toshio Matsuo,

February 9, 2026

Representative Director & President (Code No. 5631 TSE Prime)

Inquiries: Kenji Terada,

General Manager, General Affairs Department (Tel: +81-3-5745-2001)

Notice Concerning Change of Officers

The Japan Steel Works, Ltd. (the "Company") hereby announces that it has resolved to change officers as follows at a meeting of the Board of Directors held on February 9, 2026.

[Changes of Directors]

Change of director's delegated task

Name	New Title and Delegated Task	Current Title and Delegated Task	Change date
Hiroki Kikuchi	Representative Director & Executive Vice President CFO, In charge of Export Control Administration, In charge of Finance & Accounting Department, General Manager, Corporate Planning Office	Representative Director & Executive Vice President CFO, In charge of Export Control Administration, In charge of Finance & Accounting Department, General Manager, Corporate Planning Office, In charge of Material and Engineering Business Segment	Effective April 1, 2026
Shigeki Inoue	Director, Senior Managing Executive Officer CTO, In charge of Quality Management, In charge of Intellectual Property Department, In charge of Photonics Office, Director of Innovation Management Headquarters	Director, Senior Managing Executive Officer CTO, In charge of Quality Management, In charge of Intellectual Property Department, In charge of New Business Promotion Headquarters, General Manager, Quality Management Office, Director of Innovation Management Headquarters
Seiji Umamoto	Director, Senior Managing Executive Officer CISO, In charge of Office of Information Technology ＆ Office of Digital Transformation, General Manager, Business Development Office	Director, Senior Managing Executive Officer CISO, In charge of Office of Information Technology ＆ Office of Digital Transformation, General Manager, Business Development Office, In charge of Industrial Machinery Products Business Segment (Plastics Machinery Business Division) (Injection Molding Machinery Business Division) (Industrial Machinery Business Division)
Hideo Nakanishi	Director, Executive Officer In charge of Export Control Administration, In charge of General Affairs Department, General Manager, Global Business Management Department, Global Strategy Headquarters	Director, Executive Officer In charge of Export Control Administration, In charge of General Affairs Department

[Changes of Executive Officers]

Promoted Executive Officer

Name

New Title and Delegated Task

Current Title and Delegated Task

Change date

Takeshi Shinmoto

Senior Managing Executive Officer Director of Ordnance Business Division,

Representative Director & President, NIKKO TOKKI CO., LTD.

Managing Executive Officer

Director of Ordnance Business Headquarters, Representative Director & President, NIKKO

TOKKI CO., LTD.

Effective April 1, 2026

Kengo Takeya

Managing Executive Officer

In charge of Plastics Machinery Solutions Business Division,

In charge of Hiroshima Plant, Director of Plastics Machinery Business Division

Executive Officer

Director of Plastics Machinery Business Division

Change of Executive Officer's delegated task

Name	New Title and Delegated Task	Current Title and Delegated Task	Change date
Shoji Nunoshita	Managing Executive Officer Director of Global Strategy Headquarters, (concurrently) In charge of India	Managing Executive Officer In charge of Meiki Plant, Director of Injection Molding Machinery Business Division	Effective April 1, 2026
Masayuki Aoyama	Executive Officer In charge of Environmental Management, General Manager, ESG Promotion Office	Executive Officer In charge of Promoting ESG, In charge of Environmental Management
Toshiyuki Ninomiya	Executive Officer Deputy Director of Plastics Machinery Business Division	Executive Officer General Plant Manager, Hiroshima Plant, (concurrently) General Manager of Manufacturing Innovation Office of Hiroshima Plant

New Executive Officer

Name	New Title and Delegated Task	Current Title, Delegated Task and Position	Change date
	Executive Officer	General Manager, Extruder Customer Service
	Director of Plastics Machinery Solutions	Department, Plastics Machinery Business
Miki Wakayama	Business Division,	Division
	(concurrently) General Manager, CS Sales
	Department
	Executive Officer	Specialist, Managing Senior Councilor	Effective
Yuji Ueda	In charge of Meiki Plant, Director of Injection	Representative Director & President,	April 1, 2026
	Molding Machinery Business Division	TAHARA MACHINERY LTD.
	Executive Officer	Specialist, Managing Senior Councilor
So Ueda	In charge of Muroran Plant, Director of Materials and Engineering	Representative Director & President, Japan Steel Works M&E, Inc.
	Business Division

(Reference) Board Structure from April 1, 2026

Director

Name	Title	Delegated Task
Toshio Matsuo	Representative Director & President
Hiroki Kikuchi	Representative Director & Executive Vice President	CFO, In charge of Export Control Administration, In charge of Finance & Accounting Department, General Manager, Corporate Planning Office
Shigeki Inoue	Director, Senior Managing Executive Officer	CTO, In charge of Quality Management, In charge of Intellectual Property Department, In charge of Photonics Office, Director of Innovation Management Headquarters
Seiji Umamoto	Director, Senior Managing Executive Officer	CISO, In charge of Office of Information Technology ＆ Office of Digital Transformation, General Manager, Business Development Office
Hideo Nakanishi	Director, Executive Officer	In charge of Export Control Administration, In charge of General Affairs Department, General Manager, Global Business Management Department, Global Strategy Headquarters
Yoshiyuki Nakanishi	Director *
Hisao Mitsui	Director *
Junko Kawamura	Director *
Yasuyuki Kuriki	Director *
Nobuko Mizumoto	Director *

Audit & Supervisory Board Member

Name	Title
Shingo Mito	Audit & Supervisory Board Member (full-time)
Motoyuki Shibata	Audit & Supervisory Board Member (full-time)
Saori Yamaguchi	Audit & Supervisory Board Member (part-time) *
Shinya Unno	Audit & Supervisory Board Member (part-time) *

Executive Officer

Name	Title	Delegated Task
Takeshi Shinmoto	Senior Managing Executive Officer	Director of Ordnance Business Division, Representative Director & President, NIKKO TOKKI CO., LTD.
Shoji Nunoshita	Managing Executive Officer	Director of Global Strategy Headquarters, (concurrently) In charge of India
Kengo Takeya	Managing Executive Officer	In charge of Plastics Machinery Solutions Business Division, In charge of Hiroshima Plant, Director of Plastics Machinery Business Division
Masayuki Aoyama	Executive Officer	In charge of Environmental Management, General Manager, ESG Promotion Office
Miki Sawai	Executive Officer	Director of Industrial Machinery Business Division
Sadao Tanigawa	Executive Officer	General Plant Manager, Yokohama Plant, Representative Director & President, JSW Aktina System Co., Ltd.
Toshiyuki Ninomiya	Executive Officer	Deputy Director of Plastics Machinery Business Division
Tadashi Chimura	Executive Officer	In charge of Safety & Hygiene Control, In charge of CSR & Risk Management, General Manager, Personnel Department
Miki Wakayama	Executive Officer	Director of Plastics Machinery Solutions Business Division, (concurrently) General Manager, CS Sales Department
Yuji Ueda	Executive Officer	In charge of Meiki Plant, Director of Injection Molding Machinery Business Division
So Ueda	Executive Officer	In charge of Muroran Plant, Director of Materials and Engineering Business Division

Following the Ordinary General Meeting of Shareholders to be held at the end of June 2026, the board structure will be the same as above.

* indicates Outside Director or Outside Audit & Supervisory Board Member.