Nuvoton Technology Holdings Japan Announces Reappointment of Chairman

Disclosure Date: June 27, 2026 Statement Date: June 26, 2026 Statement Time: 17:49:20 Company Code: 4919 Company Name: Nuvoton Technology Corporation

Subject: Announcement on the Appointment of Chairman by Major Subsidiary Nuvoton Technology Holdings Japan

Applicable Clause: Clause 6 Event Date: June 26, 2026

Details: 1. Board Resolution Date or Change Date: June 26, 2026 2. Position (Please enter 'Chairman' or 'President'): Chairman (Representative Director Chairman) 3. Former Incumbent Name: Jason Jong 4. Former Incumbent Resume: Chairman and CEO of Winbond Electronics Corporation 5. New Appointee Name: Jason Jong 6. New Appointee Resume: Chairman and CEO of Winbond Electronics Corporation 7. Nature of Change (Please enter 'Resignation', 'Dismissal', 'End of Term', 'Job Adjustment', 'Severance', 'Retirement', 'Deceased', or 'New Appointment'): End of Term 8. Reason for Change: End of Term 9. Effective Date of New Appointment: June 26, 2026 10. Other Matters to be Clarified (If the subject of the event or resolution is a publicly issued company or above, this major information also meets the criteria under Article 7, Paragraph 6 of the Enforcement Rules of the Securities and Exchange Act regarding matters significantly affecting shareholders' rights or securities prices): None