Notice Regarding Status of Share Buyback and Completion of Acquisition (Share Buyback Based on Provisions of Article 459, Paragraph 1 of the Companies Act and Articles of Incorporation)

Overview of Share Buyback

Sumitomo Seika Chemicals Company, Limited carried out a share buyback based on the resolution of the Board of Directors dated November 12, 2025, in accordance with Article 459, Paragraph 1 of the Companies Act and Article 26 of the Articles of Incorporation. The target for acquisition was the company's common shares, with the acquisition period set from November 13, 2025, to March 31, 2026. The upper limit was 210,000 shares with a total acquisition price cap of JPY 1 billion. During the period from March 1 to March 24, 2026, 30,700 shares were acquired at a cost of JPY 204,327,000; cumulatively, the company acquired 173,500 shares totaling JPY 999,397,000, concluding the buyback.

Impact on Shareholders and Future Outlook

This share buyback was conducted with an upper limit of approximately 1.6% of total issued shares and aims to improve capital efficiency as a part of shareholder returns. The method of acquisition was market purchase on the Tokyo Stock Exchange. At present, there is no information regarding future cancellation of treasury stock or capital policy. Investors can anticipate changes in capital structure and improvement in per-share indicators; however, detailed impacts should be monitored in future announcements.