Nippon Kayaku Co., Ltd.TSE: 4272

Notice regarding Acquisition of Treasury Stock Results and Completion

· Issued by Nippon Kayaku Co., Ltd.

‌To Whom It May Concern,

April 6, 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 Results and Completion

(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)

The Company announces the acquisition of its shares in market pursuant to provisions of Article 156 of the Companies Act, as applied pursuant to Article 165, Item 3 of the Companies Act. The followings are the results in detail of acquisition of treasury stocks.

And the Company has completed the acquisition resolved at the Board of Directors meeting held on March 28, 2025.

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

  2. Total number of shares to be acquired: 799,200 shares

  3. Total acquisition cost: 1,427,473,050 yen

  4. Acquisition period: March 1, 2026 to March 31, 2026

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

(Reference)

  1. The resolution regarding acquisition of treasury stock at the Board of Directors meeting held on March 28, 2025

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

    2. Total number of shares to be acquired: 14 million shares (up to)

      (8.76% of total issued shares, excluding treasury stock)

    3. Total acquisition cost: 17.0 billion yen (up to)

    4. Acquisition period: From April 14, 2025 to March 31, 2026

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

  2. Cumulative number of shares to be acquired based on the aforementioned resolution

    1. Total number of shares to be acquired: 11,224,800 shares

    2. Total value of shares to be acquired: 16,204,610,800 yen