[ASE] Announcement of the Company's 2026 First Quarter Consolidated Financial Report Approved by the Board of Directors

1. Date of submission to or approval by the board of directors: May 8, 2026 2. Date of approval by the audit committee: May 8, 2026 3. Reporting period of financial report or annual self-audited financial information Start and end dates (YYY/MM/DD~YYY/MM/DD): January 1, 2026 ~ March 31, 2026 4. Cumulative operating revenue from January 1 to the current period (in thousands of NTD): 20,346,268 5. Cumulative operating gross profit (loss) from January 1 to the current period (in thousands of NTD): 3,810,888 6. Cumulative operating income (loss) from January 1 to the current period (in thousands of NTD): 3,500,691 7. Cumulative pre-tax net profit (loss) from January 1 to the current period (in thousands of NTD): 3,755,759 8. Cumulative current period net profit (loss) from January 1 to the current period (in thousands of NTD): 2,984,270 9. Cumulative net profit (loss) attributable to owners of the parent from January 1 to the current period (in thousands of NTD): 2,227,075 10. Cumulative basic earnings per share (loss) from January 1 to the current period (in NTD): 9.45 11. Total assets at the end of the period (in thousands of NTD): 86,440,236 12. Total liabilities at the end of the period (in thousands of NTD): 56,432,727 13. Equity attributable to owners of the parent at the end of the period (in thousands of NTD): 21,893,236 14. Other matters that should be stated: Not applicable.