Notice Concerning the Status of Acquisition of Own Shares

December 1, 2025

Company name: GIKEN LTD.

Name of representative: Atsushi Ohira, President and CEO

(Securities code: 6289; TSE Prime Market)

Inquiries: Tsuyoshi Tanouchi, Managing

Operating Officer

(TEL: +81-88-846-2933)

(Acquisition of Own Shares Under the Provisions of the Articles of Incorporation Pursuant to the Provisions of Article 165, Paragraph (2) of the Companies Act)

GIKEN LTD. (the "Company") hereby announces the acquisition status of own shares pursuant to the provisions of Article 156 of the Companies Act of Japan, as applied by replacing the relevant terms pursuant to the provisions of Article 165, Paragraph (3) of the same Act, which was determined at a meeting of the Board of Directors on October 10, 2025. The details are described below.

1. Class of shares acquired Common shares

2. Total number of shares acquired 276,000 shares

3. Total amount of share acquisition costs 460,332,689 yen

4. Acquisition period From November 1, 2025 to November 30, 2025 (record date basis)

5. Method of acquisition Market Purchase on the Tokyo Stock Exchange

(Reference)

1. Matters determined at the Board of Directors meeting on October 10, 2025

   1. Class of shares to be acquired Common shares

   2. Total number of shares to be acquired Up to 1,380,000 shares

      (5.22% of the total number of issued shares (excluding treasury shares))

   3. Total amount of share acquisition costs Up to 2,000 million yen

   4. Acquisition period From October 14, 2025 to May 31, 2026

   5. Method of acquisition Market Purchase on the Tokyo Stock Exchange

2. Cumulative number of treasury shares acquired based on the abovementioned determination of the Board of Directors (as of November 30, 2025)

   1. Total number of shares acquired 538,400 shares

   2. Total amount of share acquisition costs 904,595,489 yen