3037 Unimicron Corrects Endorsement and Guarantee Information for June 2026

Release Date: July 21, 2026 Statement Date: July 20, 2026 Statement Time: 17:53:27 Company Code: 3037 Company Name: Unimicron Technology Corporation Subject: Correction of Endorsement and Guarantee Information Disclosure for June 2026 Applicable Clause: Clause 51 Factual Date: July 20, 2026

1. Factual Date: 07/20/2026 2. Company Name: Unimicron Technology Corporation 3. Relationship with Company (Please enter '本公司' or 'Subsidiary'):本公司 4. Cross-shareholding Ratio: Not applicable 5. Reason for Occurrence: Correction of the detailed table of endorsement and guarantee information disclosed by the company for June 2026 6. Item/Report Name to be Corrected: Detailed Table of Endorsement and Guarantee Information Disclosure 7. Amount/Content/Page Before Correction:

Endorsement and Guarantee Report for Others - June 2026 Unit: NT$1,000

Endorsed Party Actual Disbursed Amount --------------------------- ------------------------ UniGreat Holding Limited 101,888

8. Amount/Content/Page After Correction:

Endorsement and Guarantee Report for Others - June 2026 Unit: NT$1,000

Endorsed Party Actual Disbursed Amount --------------------------- ------------------------ UniGreat Holding Limited 105,072

9. Response Measures: The corrected report has been re-uploaded to the Public Information Observation Station. 10. Other Matters to be Stated: None.