2208 CSBC Corporation: Announces Guarantee for Subsidiary CSBC Power Technology Co., Ltd.

Release Date: August 11, 2026 Statement Date: August 10, 2026 Statement Time: 13:44:59 Company Code: 2208 Company Name: CSBC Corporation, Taiwan (CSBC)

Subject: The company announces a guarantee provided to its subsidiary, CSBC Power Technology Co., Ltd., in accordance with Article 25, Paragraph 1, Clauses 2 to 4 of the Handling Principles for Loans and Endorsements by Publicly Issued Companies.

Event Date: August 10, 2026

Details: 1. Event Date: August 10, 2026 2. Information on the Guaranteed Entity: (1) Company Name: CSBC Power Technology Co., Ltd. (2) Relationship with Guarantor: Subsidiary (3) Guarantee Limit (in thousand NT$): 75,899,380 (4) Previous Guarantee Balance (in thousand NT$): 530,000 (5) Amount of New Guarantee (in thousand NT$): 140,000 (6) Guarantee Balance as of Event Date (in thousand NT$): 670,000 (7) Actual Amount Drawn by Guaranteed Entity (in thousand NT$): 530,000 (8) Reason for New Guarantee: To meet the operational needs of the subsidiary, CSBC Power Technology Co., Ltd., the board of directors on August 10, 2026, approved the provision of a guarantee amounting to NT$140 million.

3. Collateral Provided by the Guaranteed Entity: (1) Description: Commercial promissory notes of equivalent value (2) Value (in thousand NT$): 140,000

4. Latest Financial Statement Data of the Guaranteed Entity: (1) Capital (in thousand NT$): 75,000 (2) Accumulated Deficit (in thousand NT$): -147,823

5. Conditions for Release of Guarantee Liability: (1) Condition: Guarantee liability will be released upon maturity (2) Date: December 31, 2028

6. Total Guarantee Limit (in thousand NT$): 75,899,380

7. Guarantee Balance as of Event Date (in thousand NT$): 39,567,561

8. Ratio of Guarantee Balance to the Parent Company’s Net Equity in Latest Financial Statements: 521.32%

9. Combined Ratio of Guarantees, Long-Term Investments, and Loans to Net Equity: 521.32%

10. Other Disclosures: N/A