[O2Micro] Announcement of Chairman Election for Subsidiary Portwell Inc.

1. Date of board resolution or change: 115/05/19 2. Personnel category: Chairman 3. Previous incumbent name: Cheng Chieh-wen 4. Previous incumbent background: Director of O2Micro, Executive Director of Cloud Capital Taiwan Branch (Cayman Islands), Director of American Portwell Technology, Inc. 5. New incumbent name: Cheng Chieh-wen 6. New incumbent background: Director of O2Micro, Executive Director of Cloud Capital Taiwan Branch (Cayman Islands), Director of American Portwell Technology, Inc. 7. Reason for change: Expiration of term. 8. Reason for change: Election following the full re-election of directors and supervisors at the 115 shareholders' meeting. 9. Effective date: 115/05/19 10. Other matters: This announcement complies with Article 7, Paragraph 6 of the Enforcement Rules of the Securities and Exchange Act regarding material information impacting shareholder rights or securities prices; however, no other significant information to disclose.