GIS-KY Subsidiary Announces Acquisition of Cleanroom Facility from Ye-Huan Technology (Chengdu) Co., Ltd.

1. Name and nature of the subject matter (e.g., land located in Section XX, Subsection XX, North District, Taichung City): Cleanroom engineering facility

2. Date on which the fact occurred: June 15, 2026 ~ June 15, 2026

3. Date approved by the board of directors: June 15, 2026

4. Other approval dates: Not applicable

5. Quantity of units (e.g., XX square meters, equivalent to XX ping), unit price, and total transaction amount: Cleanroom engineering: Transaction amount of TWD 122 million

6. Counterparty and its relationship with the company (if the counterparty is an individual and not a related party of the company, name disclosure may be omitted): Ye-Huan Technology (Chengdu) Co., Ltd.; affiliated company

7. If the counterparty is a related party, state the reason for selecting the related party as the transaction party, the previous transferor, the relationship between the previous transferor and the company and the counterparty, the previous transfer date, and the transfer amount: (1) Reason for selecting a related party as the transaction party: Based on overall cost and operational planning and management considerations (2) Previous transferor and relationship: Shanghai Jiwei, Chengdu Feihong, Chengdu Hongfengda, etc. (no relationship) (3) Previous transfer date and acquisition cost: January 2024 to March 2026; approximately TWD 271 million

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

9. Estimated gain (or loss) on disposal (not applicable for asset acquisition) (if deferred, provide a table showing recognition): Not applicable

10. Delivery or payment terms (including payment period and amounts), contractual restrictions, and other important agreements: Installment payments

11. Decision method for this transaction (e.g., bidding, price comparison, negotiation), reference basis for price determination, and decision-making unit: Transaction decision method: Based on the book value of the asset Decision-making unit: Board of Directors

12. Name of professional valuation firm or company and valuation amount: Not applicable

13. Name of professional appraiser: Not applicable

14. License number of professional appraiser: Not applicable

15. Whether the valuation report indicates a limited price, specific price, or special price: No or not applicable

16. Whether a valuation report has not yet been obtained: No or not applicable

17. Reason for not yet obtaining the valuation report: Not applicable

18. If there is a significant difference in the valuation results, explain the reason and provide the accountant's opinion: Not applicable

19. Name of accounting firm: Yuan-Fu United Certified Public Accountants

20. Name of accountant: Lin Jin-Hua

21. Accountant's license number: Taipei CPA License No. 4231

22. Broker and brokerage fees: None

23. Specific purpose or use of the acquisition or disposal: Production needs

24. Opinion of any director who objected to this transaction: None

25. Whether this transaction is a related-party transaction: Yes

26. Date of supervisor approval or audit committee consent: June 15, 2026

27. Whether this transaction involves acquiring real estate or its right-of-use asset from a related party: Yes

28. Valuation amount assessed under Article 16 of the 'Regulations Governing the Acquisition or Disposition of Assets by Publicly Issued Companies': TWD 124,480,368

29. Valuation amount under Article 17 of the same regulations, if the valuation in the previous item is lower than the transaction price: Not applicable

30. Previous date of material information disclosure regarding the same event: Not applicable

31. Other explanatory matters: This transaction is based on maximizing operational efficiency among group subsidiaries and will have no material impact on GIS's financial condition or operations.