Denka : Notice Regarding Personnel Changes in Executive Officers

February 6, 2026

To whom it may concern:

Company name: Denka Company Limited

Representative name: Ikuo Ishida

Representative Director, President & CEO

(TSE Prime Code: 4061)

Shoji Koda, Contact: General Manager, Administrative Department

(Tel: +81-3-5290-5055)

Notice Regarding Personnel Changes in Executive Officers

Denka Company Limited announces that its Board of Directors passed a resolution on changes in Executive Officers, changes in their work responsibilities at a meeting held on February 6, 2026. Details are as follows.

1. Formation of Executive Officers (Effective April 1, 2026)

   (1) Promotions and changes in work responsibilities

   Name	New position	Current position
   Ikuo Ishida	(No Change)	President & CEO
   Rimiru Hayashida	(No Change)	Senior Managing Executive Officer Chief Financial Officer (CFO) Chief Supply Chain Officer (CSCO) Accounting Dept., Finance Dept., Corporate Communications Dept., Purchasing Dept., Logistics Dept.
   Masanobu Kosaka	Managing Executive Officer Chief Technical Officer (CTO) Production Engineering, New Business Development Technology Planning Dept. , Sustainability Promotion Dept., Digital Strategy & Innovation Dept.	Managing Executive Officer Chief Technical Officer (CTO) Production & Process Technology Dept., Digital Strategy & Innovation Dept., Engineering Dept.

   Name	New position	Current position
   Kei Hara	(No Change)	Managing Executive Officer Chief Human Resource Officer (CHRO) Chief Compliance Officer (CCO) Corporate Planning Dept., Best Practice Promoting Dept., HR Dept., DCU, DCG, Chinese Business
   Hiroto Horiuchi	(No Change)	Managing Executive Officer Representative Director, President and Chief Executive Officer of Akros Trading Co. Ltd.
   Michio Kawamura	Managing Executive Officer (Promoted) Omi Plant	Executive Officer Environment and Safety Dept., Quality Assurance Dept., Sustainability Promotion Dept.
   Masahiro Kawai	(No Change)	Executive Officer Managing Director of DCHA, DSPL, DAPL
   Takeshi Hagiwara	Executive Officer Omuta Plant	Executive Officer Omi Plant
   Masahiro Omata	(No Change)	Executive Officer Polymer Solutions
   Tetsuo Noguchi	Executive Officer Gosen Site	Executive Officer Shibukawa Plant
   Koji Nishimura	Executive Officer Production Engineering	Executive Officer Omuta Plant
   Taro Inada	(No Change)	Executive Officer Life Innovation
   Akinori Adachi	(No Change)	Executive Officer Administrative Dept., Legal Dept., Secretary Dept., Internal Control Dept
   Hiromichi Awada	(No Change)	Executive Officer Chiba Plant
   Akira Kasahara	(No Change)	Executive Officer General Manager Accounting Dept.
   Koya Takahashi	(No Change)	Executive Officer Elastomers & Infrastructure Solutions
   Masahide Yamada	Executive Officer New Business Development	Executive Officer Chief Scientific Officer (CSO) New Business Development Innovation Center
   Tomoya Kowada	(No Change)	Executive Officer Electronics & Innovative Products

   1. Newly Appointed

      Name	New position	Current position
      Jun Nakamoto	Executive Officer (Newly Appointed) President of Denka Performance Elastomer LLC	Assistant to the Chief Technical Officer
      	Career summary	April 1, 1999 Joined the Company August 1, 2022 General Manager Organic Materials Dept.2 Omi Plant April 1, 2024 General Manager Production Dept.4 Omuta Plant October 1, 2025 Assistant to the Chief Technical Officer
      Osamu Kunitomo	Executive Officer (Newly Appointed) Shibukawa Plant	General Manager R&D Management Dept. New Business Development
      	Career summary	April 1, 1999 Joined the Company January 1, 2022 General Manager Production Dept.4 Omuta Plant April1, 2024 General Manager R&D Management Dept. New Business Development

   2. Retired

   Name	New position	Current position
   Yukio Sasagawa	Will retire as Managing Executive Officer	Managing Executive Officer Gosen Site
   Muneatsu Miida	Will retire as Executive Officer	Executive Officer President of Denka Performance Elastomer LLC

   (Note) DCHA: Denka Chemicals Holdings Asia Pacific Pte. Ltd.

   DSPL: Denka Singapore Pte. Ltd. DAPL: Denka Advantech Pte. Ltd. DCU: Denka Corporation

   DCG: Denka Chemicals G.m.b.H

2. Organizational Reforms (Effective April 1, 2026)

＜Restructuring of the technology-related corporate departments＞

・To advance the company-wide integrated technology strategy for realizing the"Mission 2030" management plan, we will reorganize the technology-related corporate departments.

・Establish a new"Production Engineering"to oversee the , Production & Process Technology Dept., Engineering Dept., Environment and Safety Dept., and Quality Assurance Dept.

・The"Production Engineering"and"New Business Development"will be placed under the CTO's jurisdiction. A new"Technology Planning Dept."will be established directly under the CTO to plan technology strategy operations.

（Since after April 1 , 2026） （Present）

President

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Production Engineering Technology Planning Dept. Production & Process Technology Dept.

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President

Digital Strategy & Innovation Dept.

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Engineering Dept. Environment and Safety Dept. Quality Assurance Dept.

Sustainability Promotion Dept. Digital Strategy & Innovation Dept.

Engineering Dept.

Production & Process Technology Dept. Environment and Safety Dept.

Sustainability Promotion Dept. Quality Assurance Dept.

～ ～