Sodens KY Adds New Endorsement Guarantee of TWD 419,900 Thousand for Subsidiary's Bank Financing

Date of Announcement: August 18, 2026 Date of Statement: August 17, 2026 Time of Statement: 18:43:40 Company Code: 4190 Company Name: Sodens KY Purpose: Announcement on behalf of subsidiary Sodens International Co., Ltd., pursuant to Article 25, Paragraph 1, Clause 4 of the Regulations Governing Lending of Funds and Endorsement Guarantees by Publicly Issued Companies Applicable Clause: Clause 22 Date of Fact: August 17, 2026

Details: 1. Date of Fact: 08/17/2026 2. Information on the Guaranteed Party: (1) Company Name: Sodens Group Co., Ltd. (2) Relationship with Guarantee Provider: Direct parent company holding 100% equity (3) Guarantee Limit (in thousand NTD): 1,138,632 (4) Previous Guarantee Balance (in thousand NTD): 664,600 (5) Amount of New Guarantee Added (in thousand NTD): 419,900 (6) Guarantee Balance as of Date of Fact (in thousand NTD): 1,084,500 (7) Actual Amount Drawn by Guaranteed Party (in thousand NTD): 538,760 (8) Reason for New Guarantee: Providing guarantee for bank financing facility 3. Collateral Provided by Guaranteed Party: (1) Description: None (2) Value (in thousand NTD): 0 4. Latest Financial Statement of Guaranteed Party: (1) Capital (in thousand NTD): 614,460 (2) Accumulated Deficit (in thousand NTD): -34,374 5. Conditions for Release of Guarantee Liability: (1) Condition: Repayment of debt by the guaranteed party (2) Date: Expiration date of the guaranteed party’s bank contract 6. Total Guarantee Limit (in thousand NTD): 1,612,741 7. Guarantee Balance as of Date of Fact (in thousand NTD): 1,084,500 8. Ratio of Guarantee Balance to Net Assets of the Publicly Issued Company as of Date of Fact: 67.25% 9. Combined Ratio of Guarantee Balance, Long-Term Investments, and Fund Lending to Net Assets of the Publicly Issued Company: 105.16% 10. Other Disclosures: 1. The newly added guarantee amount of TWD 64,600 thousand includes a duplicate calculation due to an earlier-than-scheduled board meeting. 2. Exchange rate used: TWD 32.3 per USD, based on the Bank of Taiwan’s average closing rate on August 7, 2026.