Hai Guang Announces Renewal of Guarantee for Subsidiary in Compliance with Public Company Regulations

1. Event Date: August 2, 115 (2026)

2. Endorsed Party Details: (1) Company Name: Zhengtong Environmental Technology Co., Ltd. (2) Relationship with Guarantor: Parent-subsidiary (directly held by the company with 86.67% ownership) (3) Guarantee Limit (in thousand NT$): 383,186 (4) Previous Guarantee Balance (in thousand NT$): 290,000 (5) Amount of New Guarantee Added This Time (in thousand NT$): 60,000 (6) Total Guarantee Balance as of Event Date (in thousand NT$): 350,000 (7) Actual Amount Drawn by the Guaranteed Company (in thousand NT$): 240,000 (8) Reason for New Guarantee: Operational needs (renewal upon expiration of original limit)

3. Collateral Provided by the Guaranteed Company: (1) Description: Machinery and equipment (2) Value (in thousand NT$): 95,000

4. Latest Financial Statement of the Guaranteed Company: (1) Capital (in thousand NT$): 22,000 (2) Accumulated Profits/Losses (in thousand NT$): -34,422

5. Conditions and Date for Release of Guarantee Liability: (1) Conditions: As stipulated in the credit agreement (2) Date: As stipulated in the credit agreement

6. Total Endorsement Guarantee Limit (in thousand NT$): 766,373

7. Total Guarantee Balance as of Event Date (in thousand NT$): 350,000

8. Ratio of Guarantee Balance Provided by the Company to the Net Asset Value in the Latest Financial Statement of the Public Company: 9.13%

9. Combined Ratio of Guarantee Balance, Long-Term Investments, and Fund Lending to the Net Asset Value in the Latest Financial Statement of the Public Company: 50.31%

10. Other Disclosures: The additional guarantee this time is due to the renewal of the original credit agreement expiring on August 2, 115 (2026). The original guarantee of NT$600 million was canceled upon expiration, and a new guarantee of the same amount was reissued. Therefore, the outstanding guarantee balance after renewal remains at NT$2.9 billion.