HTC: Board of Directors Resolves to Provide Endorsement Guarantee for Important Subsidiary H.T.C. (B.V.I.) Corp.

1. Date of occurrence of the event: 2026/05/05 2. The endorsed/guaranteed entity: (1) Company name: H.T.C. (B.V.I.) Corp. (2) Relationship with the company providing endorsement/guarantee: Wholly-owned subsidiary of our company (3) Endorsement/guarantee limit (NTD thousands): 5,416,418 (4) Original endorsement/guarantee balance (NTD thousands): 0 (5) Amount of new endorsement/guarantee (NTD thousands): 4,660,000 (6) Endorsement/guarantee balance as of the date of occurrence (NTD thousands): 4,660,000 (7) Actual amount utilized by the endorsed/guaranteed company (NTD thousands): 0 (8) Reason for new endorsement/guarantee: The subsidiary intends to apply for a bank loan facility, and our company provides endorsement/guarantee within the facility limit. 3. Collateral provided by the endorsed/guaranteed company: (1) Content: None (2) Value (NTD thousands): 0 4. Latest financial report of the endorsed/guaranteed company: (1) Capital (NTD thousands): 4,840,466 (2) Accumulated profit/loss (NTD thousands): 1,064,425 5. Conditions for lifting endorsement/guarantee liability: (1) Conditions: As per contract (2) Date: As per contract 6. Total endorsement/guarantee limit (NTD thousands): 13,541,046 7. Endorsement/guarantee balance as of the date of occurrence (NTD thousands): 9,320,000 8. Ratio of endorsement/guarantee balance to net worth of publicly issued company's latest financial report as of the date of occurrence: 34.41% 9. Ratio of total endorsement/guarantee, long-term investments, and loans to others balance to net worth of publicly issued company's latest financial report as of the date of occurrence: 59.69% 10. Other matters that should be specified: A. Except for item B below, the USD to TWD exchange rate is calculated at 32.0000. B. The latest financial report audited by a CPA for the endorsed/guaranteed company is the 2024 annual financial report; therefore, the USD to TWD exchange rate for these two items is calculated using the 2024/12/31 exchange rate of 32.79.