HTC Subsidiary Invests in General Catalyst Fund

1. Name and nature of the subject matter (for preferred shares, specify terms such as dividend rate): General Catalyst Group XIII Feeder, L.P.

2. Date of occurrence: July 10, 2026 (ROC Year 115)

3. Number of units, price per unit, and total transaction amount: Number of units: Not applicable Price per unit: Not applicable Total transaction amount: USD 5,000,000

4. Counterparty and its relationship with the company (if individual and not a related party, name may be omitted): General Catalyst Partners XIII, L.P.; Unrelated party

5. If counterparty is a related party, state reason for selection, prior owner, relationship among prior owner, company, and counterparty, transfer date, and amount: Not applicable

6. If the ownership of the subject matter was held by a related party within the past five years, disclose the date, price, and relationship at the time of acquisition and disposal: Not applicable

7. Matters related to the disposal of receivables (including types of collateral, names of related parties if receivables are from related parties, and book value of such receivables): Not applicable

8. Gain (or loss) from disposal (not applicable for acquisition of securities; deferred gains/losses must be detailed): Not applicable

9. Delivery or payment terms (including payment schedule and amounts), contractual restrictions, and other important agreements: As stipulated in the contract

10. Decision-making process for the transaction, basis for price determination, and approving authority: As stipulated in the contract; approved according to the company's 'Procedures for Acquisition or Disposal of Assets'

11. Net asset value per share of the securities-issuing company: Not applicable

12. Whether the private placement reference price of the securities differs from the per-unit transaction price by more than 20%: Not applicable

13. Cumulative number, amount, ownership percentage, and restrictions on rights (e.g., pledge status) of the securities held (including this transaction) to date: Cumulative number: Not applicable Cumulative amount: USD 5,000,000 Ownership percentage: Not applicable Restrictions on rights: None

14. Proportion of cumulative private securities investments (including this transaction) to total assets and equity attributable to owners of the parent in the latest financial statements, and the amount of working capital: Percentage of total assets: 5.97% Percentage of equity attributable to owners of the parent: 8.36% Working capital amount: TWD -7,051,317 thousand

15. Manager and brokerage fees: None

16. Specific purpose or use of the acquisition or disposal: Capital deployment

17. Dissenting opinions from directors regarding this transaction: None

18. Whether this transaction is a related-party transaction: No

19. Board approval date: Not applicable

20. Date of supervisor approval or audit committee consent: Not applicable

21. Whether auditors issued an adverse opinion on this transaction: Not applicable

22. Name of auditing firm: Not applicable

23. Name of auditor: Not applicable

24. Auditor license number: Not applicable

25. Other explanatory matters: The above TWD amounts are calculated at an exchange rate of USD 1 = TWD 32.1590. Actual values will be based on the exchange rate on the transaction date.