Advantech Announces Disposal of Real Estate by Subsidiary Advantech Japan Co., Ltd. (AJP) – Supplement to April 30, 2026 Announcement

1. Name and nature of the asset (e.g., land located in Section XX, Subsection XX, North District, Taichung City): Land and building located in Asakusa 6-chome, Taito-ku, Tokyo

2. Date of occurrence: June 30, 2026 ~ June 30, 2026

3. Board approval date: April 30, 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: Land: 368.41 square meters Building: 1,648.07 square meters Estimated total transaction amount: JPY 1,810,000,000 (approximately NTD 363,810,000)

6. Counterparty and its relationship with the company (if the counterparty is an individual and not a related party, name disclosure may be omitted): Sekisui House Real Estate, Ltd.; unrelated party

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

8. If the asset’s owner was a related party of the company within the past five years, disclose the date of acquisition and disposal, 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): Estimated disposal gain: JPY 930 million (subject to auditor-verified financial statements)

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

11. Method of transaction determination (e.g., bidding, price comparison, negotiation), basis for price determination, and decision-making unit: Transaction determination method: Bidding Basis for price determination: Market conditions and professional valuation report Decision-making unit: Board authorized the chairman to sell at no less than a specified price

12. Name of professional valuation firm or company and valuation amount: Savills Taiwan Real Estate Appraisal Office, JPY 1,010,000,000

13. Name of professional appraiser: Chang Hung-Kai

14. Appraiser’s license number: Real Estate Appraiser Certificate No.: (96) MOI Appraisal No. 000294

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

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

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

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

19. Name of accounting firm: Not applicable

20. Name of accountant: Not applicable

21. Accountant’s license number: Not applicable

22. Broker and brokerage fees: As stipulated in the entrusted sales contract

23. Specific purpose or use of the acquisition or disposal: Asset optimization

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: April 30, 2026

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

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

29. Valuation amount 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: April 30, 2026

31. Other explanatory matters: 1. The original announcement was filed on April 30, 2026. This is a supplementary announcement confirming finalized transaction terms. 2. NTD equivalent calculated using an exchange rate of JPY/NTD = 0.201.