3231 Wistron: Subsidiary Expands Factory Construction in Vietnam, Investment Raised to $1.78 Billion

Release Date: June 27, 2026 Statement Date: June 26, 2026 Statement Time: 16:05:18 Company Code: 3231 Company Name: Wistron Subject: [Update] Announcement by subsidiary Wistron InfoComm (Vietnam) Co., Ltd. regarding leasing land for commissioned construction of real estate, building improvements, and acquisition of machinery and equipment Applicable Clause: Clause 20 Factual Date: June 26, 2026

1. Name and nature of the subject matter (e.g., land located in Section XX, Subsection XX, North District, Taichung City): Construction of factory, warehouse, and supporting facilities in the Kim Bang Industrial Zone

2. Factual Date: June 26, 2026 ~ June 26, 2026

3. Board Approval Date: June 26, 2026

4. Other Approval Dates: Not applicable

5. Quantity of transaction units (e.g., XX square meters, equivalent to XX ping), unit price, and total transaction amount: The construction cost for factory, warehouse, and supporting facilities in the Kim Bang Industrial Zone has increased by approximately USD 245 million, bringing the adjusted total construction cost to approximately USD 1,387.68 million.

6. Counterparty and its relationship with the company (if the counterparty is an individual and not a related party, name disclosure may be omitted): Not yet determined

7. If the counterparty is a related party, state the reason for selection, previous transferor, relationships among the previous transferor, the company, and the counterparty, transfer date, and transfer amount: Not yet determined

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

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

10. Delivery or payment terms (including payment schedule and amounts), contractual restrictions, and other important agreements: Payment via wire transfer

11. Decision method for the transaction (e.g., bidding, comparison, negotiation), reference basis for pricing, and decision-making unit: Approved by the Board of Directors

12. Name of professional appraiser firm or company and appraisal value: Not applicable

13. Name of professional appraiser: Not applicable

14. Professional appraiser license number: Not applicable

15. Whether the appraisal report is for a limited price, specific price, or special price: No or not applicable

16. Whether an appraisal report has not yet been obtained: No or not applicable

17. Reason for not obtaining an appraisal report: Not applicable

18. If there is a significant difference in appraisal results, explain the reason and include auditor’s opinion: Not applicable

19. Name of accounting firm: Not applicable

20. Name of auditor: Not applicable

21. Auditor license number: Not applicable

22. Broker and brokerage fees: None

23. Specific purpose or use of the acquisition or disposal: To meet business development and strategic planning needs

24. Opinions of directors who objected to the transaction: None

25. Whether the transaction is with a related party: No

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

27. Whether the transaction involves acquiring real estate or right-of-use assets from a related party: No

28. Valuation price under Article 16 of the “Regulations on Acquisition or Disposal of Assets by Publicly Issued Companies”: Not applicable

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

30. Previous date of material information disclosure regarding the same event: On May 8, 2026, an updated announcement was issued on behalf of subsidiary Wistron InfoComm (Vietnam) Co., Ltd. (abbreviated as WVN) regarding leasing land for commissioned construction of real estate, building improvements, and acquisition of machinery and equipment

31. Other explanatory matters: Construction of factory, warehouse, and supporting facilities in the Kim Bang Industrial Zone, and building improvements and acquisition of machinery and equipment in the Tongwen-San Industrial Zone. The total investment amount has increased from the original USD 1,537.68 million to USD 1,782.68 million.