Nippon Kayaku Co., Ltd.TSE: 4272

Notice regarding Acquisition of Treasury Stock

· Issued by Nippon Kayaku Co., Ltd.

‌To Whom It May Concern,

May 12, 2026

Name of company: Nippon Kayaku Co., Ltd.

Name of representative: Shigeyuki Kawamura, President Code No.: 4272

Tokyo Stock Exchange, Prime Market

Contact: Tsutomu Kawamura, Senior Director General Manager of

Finance & Accounting Division (Tel: +81-3-6731-5842)

Notice regarding Acquisition of Treasury Stock

(Acquisition of treasury stock pursuant to the provisions of the Articles of Incorporation pursuant to the provision of Article 165, Item 2 of the Companies Act)

At the Board of Directors meeting held on May 12, 2026, the Company decided to acquire its own shares in the market pursuant to the provisions of Article 156 of the Companies Act, as applied pursuant to Article 165, Item 3 of the Companies Act.

  1. Reason for acquisition of treasury stock

    The Company acquires its own stocks in order to further return profits to shareholders, improve capital efficiency, increase corporate value in accordance with "Measures for Delivering Management with an Awareness of the Cost of Capital and Stock Prices" announced on March 28, 2025.

  2. Contents of the acquisition approved by the Board of Directors meeting on May 12, 2026

    1. Type of shares to be acquired: Common shares of the Company

    2. Total number of shares to be acquired: 13.0 million shares (up to) (8.75% of total shares issued, excluding treasury stock)

    3. Total acquisition cost: 15.0 billion yen (up to)

    4. Acquisition period: From May 13, 2026 to March 31, 2027

    5. Acquisition method: Open market acquisition of shares on the Tokyo Stock Exchange

(Reference) Numbers of treasury stock as of March 31, 2026

  1. Total number of shares outstanding (excluding treasury stock): 148,502,884 shares

  2. Treasury stock: 11,497,116 shares