Notice Regarding the Results and Completion of Acquisition of Own Shares

For Immediate Release:

December 2,2025

Company name: Sakai Chemical Industry Co., Ltd.

Representative: President and Representative Director,

Toshiyuki Yagura (TSE Prime Market,Stock code:4078)

Inquiries: Director, General Manager of Accounting & Finance Department

Hiroyuki Hattori

Telephone: +81-72-223-4111

Sakai Chemical Industry Co., Ltd. (the "Company") has resolved, at a meeting of the Board of

Directors held on May 14, 2025, the matters concerning the acquisition of own shares pursuant to the provisions of Article 459, paragraph (1) of the Companies Act and the provisions of Article 42 of the Company's Articles of Incorporation. The Company would like to inform you about the status of the acquisition as follows. And this brings to a close the own share purchase period.

１． Class of shares acquired

２. Total number of shares

acquired

３. Total amount of share

acquisition costs

Common shares 39,900 shares

119,187,500 yen

４. Acquisition period From November 1, 2025 to November 30, 2025

(on a contract basis)

５. Acquisition Method Market purchases through the Tokyo Stock Exchange

(Reference)

1. Matters resolved at the Board of Directors meeting on May 14,2025.

   1. Class of shares to be acquired

      Total number of shares to be

      Common shares

      Up to 1,000,000 shares

   2. acquired

      (6.17% of total number of issued shares (excluding treasury shares))

   3. Total amount of share acquisition costs

      Up to 2,500,000,000 yen

   4. Acquisition period From May 15,2025 to November 30,2025

      (on a contract basis)

      ① Market purchases through the Tokyo Stock

   5. Method of acquisition

      Exchange

      ② Market purchases through Off-Auction Own Share Repurchase Trading System (ToSTNet-3)

2. Total own shares acquisitioned in accordance with the resolution at the Board of Directors meeting on May 14, 2025 (as of November 30, 2025)

   1. Total number of shares acquired

   2. Total amount of share acquisition costs

914,000 shares

2,499,942,000yen

※Following this acquisition, the Company plans to cancel all the treasury shares that have been acquired.

Note : 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.

The Company plans to cancel all treasury shares that have been acquired.