Huiyou Provides New Guarantee for Subsidiary's Bank Loan Extension

Disclosure Date: August 13, 2026 Statement Date: August 12, 2026 Statement Time: 15:01:47 Company Code: 5484 Company Name: Huiyou

Subject: The endorsement guarantee provided by the company meets the requirements stipulated in Article 25, Paragraph 1, Clause 4 of the 'Regulations Governing Lending and Endorsement Guarantees by Publicly Issued Companies'.

Applicable Clause: Clause 22

Event Date: August 12, 2026

Details:

1. Event Date: August 12, 2026

2. Information on the Guaranteed Entity: (1) Company Name: Huiyou Electronics (USA) Corp. (2) Relationship with Guarantee Provider: 100% owned subsidiary (3) Guarantee Limit (in NT$ thousand): 165,812 (4) Previous Guarantee Balance (in NT$ thousand): 47,775 (5) Amount of New Guarantee (in NT$ thousand): 47,775 (6) Outstanding Guarantee Balance as of Event Date (in NT$ thousand): 95,550 (7) Actual Amount Drawn by Guaranteed Entity (in NT$ thousand): 46,183 (8) Reason for New Guarantee: Endorsement guarantee for one-year extension of subsidiary's bank credit line

3. Collateral Provided by Guaranteed Entity: (1) Description: None (2) Value (in NT$ thousand): 0

4. Latest Financial Statement of Guaranteed Entity: (1) Capital (in NT$ thousand): 51,717 (2) Accumulated Deficit (in NT$ thousand): -101,760

5. Conditions for Release of Guarantee Liability: (1) Condition: Guarantee liability automatically terminates upon expiration of subsidiary's bank credit agreement (2) Date: November 8, 2027

6. Total Guarantee Limit (in NT$ thousand): 276,354

7. Total Outstanding Guarantee Balance as of Event Date (in NT$ thousand): 193,700

8. Ratio of Guarantee Balance Provided by the Company to the Net Equity of the Publicly Issued Company as of Event Date: 35.05%

9. Combined Ratio of Guarantee Balance, Long-Term Investments, and Fund Lending to the Net Equity of the Publicly Issued Company as of Event Date: 8.54%

10. Other Disclosures: None