Unimicron Announces Adjustment of Conversion Price for First Domestic Unsecured Convertible Bonds

1. Factual Date: June 18, 2026 2. Company Name: Unimicron Technology Corporation 3. Relationship with Company (Please enter '本公司' or 'Subsidiary'):本公司 (Our Company) 4. Cross-shareholding Ratio: Not applicable 5. Reason for Occurrence: In response to the company's cash dividend distribution, the conversion price is adjusted in accordance with Article 11 of the 'Issuance and Conversion Regulations for the First Domestic Unsecured Convertible Bonds' of the Company. 6. Countermeasures: From the ex-dividend benchmark date, July 12, 2026, the conversion price of the first domestic unsecured convertible bonds will be adjusted from NT$164.1 to NT$163.8. 7. Other Matters to be Stated (If the subject of the event or resolution is a publicly issued company or above, this major information simultaneously qualifies as a matter under Article 7, Paragraph 9, Item 9 of the Enforcement Rules of the Securities and Exchange Act that has a significant impact on shareholders' rights or securities prices): None Keywords: Major Information