[UBOT] Announcement of Unaudited Earnings for May 2026

1. Date of occurrence: 2026/06/03 2. Company name: Union Bank of Taiwan Co., Ltd. 3. Relationship with the company: The company itself 4. Mutual shareholding ratio: Not applicable 5. Reason for occurrence: Voluntary announcement of unaudited earnings

- May Earnings: Monthly Pre-tax NT$853,425,000, Monthly After-tax NT$740,180,000 - Cumulative Earnings: Cumulative Pre-tax NT$3,379,076,000, Cumulative After-tax NT$2,824,920,000 - Consolidated income including non-controlling interests: Monthly After-tax NT$740,260,000, Cumulative After-tax NT$2,825,067,000 - Earnings Per Share (EPS): Monthly NT$0.16, Cumulative NT$0.50

Note: The above data are unaudited figures and have not been reviewed or audited by accountants. Note 2: The shareholders' meeting on 2026/05/29 approved the distribution of NT$526,125,000 in cash dividends for preferred shares and 260,433,106 shares as stock dividends for common shares; therefore, the cumulative EPS for May has been retroactively adjusted.

6. Countermeasures: None. 7. Other important items: (1) The non-performing loan ratio at the end of May was 0.26%; the loan loss coverage ratio was 502.6%. (2) The consolidated pre-tax profit for the year up to May increased by 40.22% compared to the same period last year.