Alchip-KY Subsidiary Announces Investment in ACHI CAPITAL PARTNERS FUND L.P.(II) (Provisional Name)

1. Name and nature of the target (if preferred shares, specify issuance terms such as dividend rate): ACHI CAPITAL PARTNERS FUND L.P.(II) (Provisional Name)

2. Date of occurrence: August 14, 2026 (R.O.C. Year 115)

3. Number of transaction units, price per unit, and total transaction amount: Number of units: Not applicable Price per unit: Not applicable Total transaction amount: USD 9,000,000

4. Counterparty and its relationship with the company (if the counterparty is a natural person and not a related party, name disclosure may be omitted): ACHI CAPITAL PARTNERS FUND L.P.(II) (Provisional Name); Unrelated party

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

6. If the target’s owner was a related party of the company within the past five years, disclose the related party’s acquisition and disposal date, price, and relationship with the company at the time: Not applicable

7. Matters related to the disposal of receivables (including types of collateral attached to disposed receivables; if receivables from related parties are involved, disclose the related party’s name and book value of the disposed receivables): Not applicable

8. Gain (or loss) from disposal (not applicable for acquisition of securities; if deferred, provide a table showing recognition status): Not applicable

9. Delivery or payment terms (including payment schedule and amounts), contractual restrictions, and other important agreements: Contract not yet signed. The Chairman is authorized to handle all subsequent investment procedures.

10. Decision-making method, reference basis for pricing, and decision-making unit: Decision method and pricing basis: As stipulated in the contract Decision-making unit: Board of Directors

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

12. Discrepancy of 20% or more between private placement reference price and per-share transaction amount of the securities-issuing company: Not applicable

13. Cumulative holdings (including this transaction) of the securities: quantity, amount, ownership percentage, and restricted rights (e.g., pledge status): Quantity: Not applicable Amount: USD 9,000,000 Ownership percentage: Based on actual subscription ratio Restricted rights: None

14. Proportion of cumulative private placement securities investments (including this transaction) to total assets and equity attributable to owners of parent in the latest financial statements, and amount of working capital in the latest financial statements: Proportion to total assets: 0.32% Proportion to equity attributable to owners of parent: 0.48% Working capital amount: NT$55,517,671 thousand

15. Manager and brokerage fees: None

16. Specific purpose or use of the acquisition or disposal: Long-term investment

17. Dissenting directors’ opinions on this transaction: None

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

19. Date of board approval: August 14, 2026 (R.O.C. Year 115)

20. Date of supervisor approval or audit committee consent: August 14, 2026 (R.O.C. Year 115)

21. Whether the accountant issued a non-reasonableness opinion for this transaction: Not applicable

22. Name of accounting firm: Not applicable

23. Name of accountant: Not applicable

24. Accountant’s license number: Not applicable

25. Other disclosures: None