Hsintai Environmental Engineering Announces Acquisition of Right-of-Use Asset

1. Name and nature of the subject property (e.g., land located at Section XX, Subsection XX, North District, Taichung City): 16F, No. 95, Section 2, Dunhua South Road, Taipei City

2. Date on which the event occurred: June 16, 2026 ~ June 16, 2026

3. Board approval date: June 16, 2026 (Minguo Year 115)

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: Total area: 224.04 ping, average monthly price per ping: approximately NT$3,040–3,131 (exclusive of tax) Total contract amount: NT$41,539,176 (exclusive of tax), right-of-use asset value: NT$39,133,774

6. Counterparty and its relationship with the company (if the counterparty is a natural person and not a related party of the company, name disclosure may be omitted): Counterparty: Continental Engineering Corporation Relationship with the company: 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 among the previous transferor, the company, and the counterparty, the previous transfer date, and the transfer amount: 1. Reason for selecting related party as counterparty: Required for overall operational planning 2. Previous transferor: Not applicable 3. Relationship among previous transferor, company, and counterparty: Not applicable 4. Previous transfer date: Not applicable 5. Previous transfer amount: Not applicable

8. If the ownership of the subject asset was held by 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 of transaction: Not applicable

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

10. Delivery or payment terms (including payment periods and amounts), contractual restrictions, and other important provisions: 1. Delivery or payment terms: Paid monthly according to contract 2. Lease term: July 1, 2026 ~ December 31, 2031 3. Contractual restrictions: None 4. Other important provisions: None

11. Method of determining the transaction (e.g., bidding, price comparison, negotiation), basis for price determination, and decision-making unit: 1. Transaction determination method: Negotiation based on market conditions 2. Basis for price determination: Reference to regional office rental prices 3. Decision-making unit: Board approval

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

13. Name of professional appraiser: Not applicable

14. Appraiser’s license number: Not applicable

15. Whether the appraisal report is for a limited, specific, 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 accountant: Not applicable

21. Accountant’s license number: Not applicable

22. Broker and brokerage fee: Not applicable

23. Specific purpose or use of the acquisition or disposal: Leased for office use.

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

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

26. Date of supervisor approval or audit committee consent: June 16, 2026 (Minguo Year 115)

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

28. Valuation price under Article 16 of the 'Asset Acquisition and Disposal Rules for Publicly Issued Companies': Not applicable

29. Valuation price under Article 17 of the same rules, 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: Not applicable

31. Other explanatory matters: None