[UMC] Announcement of Material Financial and Business Information Due to Securities Reaching Public Attention Threshold on Exchange

1. Factual Date: 115/06/23 2. Reason: In accordance with notification from Taiwan Stock Exchange Corporation 3. Financial and Business Information: Consolidated financial data of the Company:

Item Most Recent Month YoY Change% Most Recent Quarter YoY Change% Last Four Quarters Cumulative Period May 115 Q1 115 From Q2 114 to Q1 115 (Unaudited Self-Reported) (Audited/Reviewed) (Audited/Reviewed) ================================================================================================== Revenue (NT$M) 22,944 17.8% 61,038 5.5% 240,732 Pre-tax Net Profit (NT$M) 8,379 202.9% 16,644 78.1% 56,945 Net Profit Attributable to Owners of Parent (NT$M) 8,449 203.0% 16,171 107.9% 50,111 Earnings Per Share (NT$) 0.68 195.7% 1.29 108.1% 4.01

4. Whether there are material events under Article 4 of the 'Procedures for Verification and Disclosure of Material Information by Listed Companies on the Taiwan Stock Exchange': No 5. Whether there is a material information press conference under Article 11: No 6. Complete financial information is available on the Public Information Observation Station via the following paths: (1) Recent operating revenue and profit/loss: Company Information > Highlights (2) Historical monthly operating revenue: Operations > Monthly Revenue > Monthly Revenue Information under IFRSs (3) Historical profit/loss (audited/reviewed): Financial Statements > Under IFRSs > Consolidated/Individual > Consolidated Income Statement (4) Historical profit/loss (voluntary self-reported): Operations > Self-Reported Profit/Loss: None 7. Other Matters to Note: The monthly financial figures disclosed herein are unaudited self-reported numbers and have not been audited or reviewed by accountants. Furthermore, the Company evaluates and recognizes investment gains/losses from equity-method investments on a quarterly basis. The above monthly self-reported figures do not include such equity-method investment gains/losses. Investors should note the limitations of this accounting timing and refer to the accountant-reviewed quarterly reports to be published in the future.