Unimicron Announces Major Financial Information Due to Securities Trading Alert Threshold on Exchange

1. Date of Event: August 6, 115 (2026)

2. Reason for Announcement: In accordance with notification from the Taiwan Stock Exchange Corporation

3. Financial and Business Information:

Period (Monthly) (Quarterly) (Last Four Quarters Cumulative) ------ ----------------------- ------------------------ Latest Month YoY Change Latest Quarter YoY Change Q3 114 to Q2 115 Item (June 115) (%) (Q2 115) (%) Reviewed Amount ============================================================================================ Consolidated Revenue (Million) 14,897 36% 42,890 32% 149,022 Pre-tax Net (Loss) Profit (Million) 5,934 1554% 15,576 4266% 28,972 Net (Loss) Profit Attributable to Owners of Parent (Million) 4,724 1773% 13,115 44197% 23,887 (Earnings) Loss per Share (NT$) 3.04 1688% 8.45 42150% 15.46

4. Whether there is any material information under Article 4 of the 'Procedures for Verification and Disclosure of Material Information by Listed Companies' of the Taiwan Stock Exchange Corporation: No

5. Whether there is any press conference for material information under Article 11 of the said Procedures: No

6. Complete financial information is available on the Public Information Observation Station. Access paths: (1) Recent operating revenue and profit/loss: Basic Information > Highlights (2) Historical monthly revenue: Business Overview > Monthly Revenue > Monthly Revenue Information under IFRSs (3) Historical profit/loss (audited/reviewed figures): Financial Statements > Under IFRSs > Consolidated/Individual Statements > Consolidated Statement of Comprehensive Income (4) Historical profit/loss (voluntary self-calculation announcements): Business Overview > Self-Announced Earnings: None

7. Other Matters to be Clarified: The Company’s operations are normal. The stock price fluctuations in the centralized market are determined by market trading mechanisms and are not related to the Company.