2478 Dayi: Announces Financial Information Due to TWSE Trading Alert

Release Date: June 24, 2026 Statement Date: June 23, 2026 Statement Time: 15:26:43 Company Code: 2478 Company Name: Dayi

Subject: The company's securities have met the Taiwan Stock Exchange's criteria for public alert on trading activity, prompting the disclosure of significant financial and operational information to assist investor understanding.

Applicable Clause: Item 51 Event Date: June 23, 2026

Details: 1. Event Date: June 23, 2026 2. Reason: Announcement made per notification from Taiwan Stock Exchange Corporation. 3. Financial and Operational Information:

Period (Monthly) (Quarterly) (Last Four Quarters) -------------------------------------------------------------------------------- Most Recent Month YoY Change% Most Recent Quarter YoY Change% (Q2 2025 to Q1 2026) (May 2026) (Q1 2026) (Consolidated Audited) Item (Consolidated Self-Prepared) (Consolidated Reviewed) -------------------------------------------------------------------------------- Revenue (NT$M) 544 16.49% 1,420 9.65% 5,549 Pre-tax Net Profit (NT$M) 69 531.25% 200 29.87% 629 Net Profit Attributable to Owners of Parent (NT$M) 55 445.00% 163 28.35% 530 EPS (NT$) 0.39 445.47% 1.14 29.55% 3.71

4. Whether there are any material events under Article 4 of the 'TSEC Procedures for Verification and Disclosure of Material Information by Listed Companies': No 5. Whether there is a press conference scheduled under Article 11 of the same 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: Operations > Monthly Revenue > Monthly Revenue Information under IFRS (3) Historical profit/loss (audited/reviewed): Financial Statements > Under IFRS > Consolidated/Individual > Comprehensive Income Statement (4) Historical profit/loss (voluntary self-prepared announcements): Operations > Self-Prepared Profit/Loss Announcements

7. Other Notes: The weighted average number of shares used in EPS calculation has excluded treasury shares.