3055 Weihwa Technology Announces Updated Guarantee Commitments for Subsidiaries

Announcement Date: August 6, 2026 Statement Date: August 5, 2026 Statement Time: 15:34:45 Company Code: 3055 Company Name: Weihwa Technology Co., Ltd. Subject: Announcement of endorsement guarantee matters pursuant to Article 25, Paragraph 1, Clauses 3 and 4 of the Handling Principles for Loans and Endorsement Guarantees by Publicly Issued Companies. Applicable Clause: Clause 22 Event Date: August 5, 2026

Details: 1. Event Date: 08/05/2026

2. Endorsed Entities: (1) Company Name: Siwei Technology Co., Ltd. (2) Relationship with Guarantor: A 100%-indirectly-held subsidiary of the company. (3) Guarantee Limit (in thousand NTD): 811,223 (4) Previous Guarantee Balance (in thousand NTD): 80,000 (5) Amount of New Guarantee Added This Time (in thousand NTD): 15,000 (6) Guarantee Balance as of Event Date (in thousand NTD): 95,000 (7) Actual Drawdown Amount by Guaranteed Entity (in thousand NTD): 0 (8) Reason for New Guarantee: Renewal of expiring bank credit facilities and alignment with overall group operations.

(1) Company Name: Weihwa Electronic Technology (Shanghai) Co., Ltd. (2) Relationship with Guarantor: A 100%-indirectly-held subsidiary of the company. (3) Guarantee Limit (in thousand NTD): 811,223 (4) Previous Guarantee Balance (in thousand NTD): 95,550 (5) Amount of New Guarantee Added This Time (in thousand NTD): 161,550 (6) Guarantee Balance as of Event Date (in thousand NTD): 257,100 (7) Actual Drawdown Amount by Guaranteed Entity (in thousand NTD): 0 (8) Reason for New Guarantee: Renewal of expiring bank credit facilities and adjustment of credit limit within group operational framework.

3. Collateral Provided by Guaranteed Entity: (1) Description: None (2) Value (in thousand NTD): 0

4. Latest Financial Statement Data of Guaranteed Entity: (1) Capital (in thousand NTD): 235,065 (2) Accumulated Profit/Loss (in thousand NTD): -292,955

5. Conditions for Release of Guarantee Liability: (1) Terms: As stipulated in the contract (2) Date: As stipulated in the contract

6. Total Endorsement Guarantee Limit (in thousand NTD): 1,297,956

7. Total Guarantee Balance as of Event Date (in thousand NTD): 352,100

8. Ratio of Guarantee Balance to Net Equity of the Issuer’s Latest Financial Statements: 21.70%

9. Combined Ratio of Guarantee, Long-Term Investment, and Fund Lending Balances to Net Equity: 41.63%

10. Other Matters to be Disclosed: (1) Capital of Guaranteed Entities (in thousand NTD): 235,065 - Siwei Technology Co., Ltd.: NTD 30,000 thousand - Weihwa Electronic Technology (Shanghai) Co., Ltd.: NTD 205,065 thousand

(2) Accumulated Profit/(Loss) of Guaranteed Entities (in thousand NTD): -292,955 - Siwei Technology Co., Ltd.: NTD -7,769 thousand - Weihwa Electronic Technology (Shanghai) Co., Ltd.: NTD -285,186 thousand

(3) Details of Current Changes: - Weihwa Technology (the Company) renews endorsement guarantee for subsidiary Siwei Technology in the amount of NTD 15,000 thousand. - Weihwa Technology (the Company) renews endorsement guarantee for subsidiary Weihwa Electronic Technology (Shanghai), increasing the original limit from USD 3,000 thousand to USD 5,000 thousand.

(4) Cumulative impact due to renewal leading to double-counting: NTD 15,000 thousand and USD 3,000 thousand (approximately NTD 96,930 thousand), totaling approximately NTD 111,930 thousand.