【Yusin-KY】Endorsement Guarantee Reaches Article 25, Paragraph 1, Subparagraph 4 of the Regulations Governing the Handling of Endorsement Guarantees and Must Be Announced and Reported

1. Date of occurrence of the event: 2026/05/07 2. Endorsed and guaranteed entity: (1) Company name: Samoa-registered Yongxin Braking Co., Ltd. (2) Relationship with the endorsing and guaranteeing company: A 100% directly invested subsidiary of the Company. (3) Endorsement and guarantee limit (in thousands of NTD): 1,264,640 (4) Original endorsement and guarantee balance (in thousands of NTD): 200,000 (5) Amount of newly added endorsement and guarantee (in thousands of NTD): 266,215 (6) Endorsement and guarantee balance as of the date of occurrence (in thousands of NTD): 466,215 (7) Actual amount utilized by the endorsed and guaranteed company (in thousands of NTD): 61,880 (8) Reason for newly added endorsement and guarantee: Renewal of the original endorsement and guarantee amount. 3. Collateral provided by the endorsed and guaranteed company: (1) Content: None (2) Value (in thousands of NTD): 0 4. Most recent financial statements of the endorsed and guaranteed company: (1) Capital (in thousands of NTD): 114,081 (2) Accumulated profit/loss (in thousands of NTD): -325,389 5. Release of endorsement and guarantee liability: (1) Conditions: Release upon maturity within one year. (2) Date: Release upon maturity within one year. 6. Total endorsement and guarantee limit (in thousands of NTD): 1,264,640 7. Endorsement and guarantee balance as of the date of occurrence (in thousands of NTD): 466,215 8. Ratio of endorsement and guarantee balance to the net worth of the public company's most recent financial statements as of the date of occurrence: 14.43 9. Ratio of the total amount of endorsement and guarantee, long-term investments, and loans to others to the net worth of the public company's most recent financial statements as of the date of occurrence: 14.43 10. Other matters that need to be specified: Calculated using the USD exchange rate of 31.66 on April 30.