Hwachang Provides Endorsement Guarantee for Subsidiary, Pursuant to Article 25, Paragraph 1 of the Regulations on Fund Lending and Endorsement Guarantees for Publicly Listed Companies

1. Event Date: 2026/07/10

2. Details of the Endorsed Party: (1) Company Name: Hwachang Heavy Electric Co., Ltd. (2) Relationship with Guaranteeing Company: 100% owned subsidiary (3) Guarantee Limit (in thousand NT$): 4,119,278 (4) Previous Guarantee Balance (in thousand NT$): 0 (5) Amount of New Guarantee (in thousand NT$): 2,800,000 (6) Guarantee Balance as of Event Date (in thousand NT$): 2,800,000 (7) Actual Amount Drawn by Guaranteed Party (in thousand NT$): 0 (8) Reason for New Guarantee: Operational requirements

3. Collateral Provided by the Guaranteed Party: (1) Description: None (2) Value (in thousand NT$): 0

4. Latest Financial Statement of the Guaranteed Party: (1) Capital (in thousand NT$): 1,100,000 (2) Accumulated Profits/Losses (in thousand NT$): 1,494,748

5. Conditions for Release of Guarantee Liability: (1) Condition: Upon repayment or contract expiration (2) Date: Upon repayment or contract expiration

6. Total Guarantee Limit (in thousand NT$): 4,943,133

7. Total Guarantee Balance as of Event Date (in thousand NT$): 3,100,000

8. Ratio of Hwachang's Guarantee Balance to the Net Assets of the Publicly Listed Company as of Event Date: 37.63%

9. Combined Ratio of Guarantee Balance, Long-Term Investments, and Fund Lending to the Net Assets of the Publicly Listed Company: 88.64%

10. Other Disclosures: None