Notice Regarding the Status of Treasury Stock Acquisition (Acquisition of Treasury Stock Based on the Provisions of Article 165, Paragraph 2 of the Companies Act)

Overview of Treasury Stock Acquisition

Hamamatsu Photonics K.K. is implementing a plan to acquire treasury stock during the period from November 10, 2025, to September 30, 2026, based on the Board of Directors resolution dated November 7, 2025. In April 2026, 1,030,900 common shares were acquired for a total of 1,988,842,700 yen. The cumulative number of shares acquired has reached 8,693,700 shares, with an acquisition cost of 14,999,764,450 yen. The acquisition method is market purchases on the Tokyo Stock Exchange, with an acquisition limit set at 15,000,000 shares and an acquisition cost limit of 20 billion yen.

Impact on Shareholders and Future Outlook

The current treasury stock acquisition is conducted with an upper limit representing approximately 5.02% of the total issued shares, aiming to enhance shareholder value. The acquired shares are held as treasury stock and may be cancelled or reused in the future. Going forward, acquisitions are expected to continue within the plan period while considering market conditions. For investors, this acquisition is anticipated to mitigate earnings per share dilution and provide support for the stock price.