【APCB】Announcement that the Endorsement and Guarantee Balance of the Company and its Subsidiary Comply with Article 25, Paragraph 1, Subparagraph 4 of the "Regulations Governing Endorsements and Guarantees by Public Companies"

1. Date of occurrence of the event: May 5, 2026 2. Endorsed and guaranteed entity: (1) Company name: UNITECH PCB(THAILAND)CO.,LTD. (2) Relationship with the company providing the endorsement and guarantee: A wholly-owned subsidiary of the Company (3) Limit of endorsement and guarantee (in thousands of NTD): 6,356,540 (4) Original balance of endorsement and guarantee (in thousands of NTD): 94,980 (5) Amount of newly added endorsement and guarantee (in thousands of NTD): 2,140,760 (6) Balance of endorsement and guarantee up to the date of occurrence (in thousands of NTD): 2,235,740 (7) Actual amount utilized by the endorsed and guaranteed company (in thousands of NTD): 212,446 (8) Reason for the newly added endorsement and guarantee: For bank financing guarantee for the operating capital of UNITECH PCB(THAILAND)CO.,LTD. 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): 2,679,436 (2) Accumulated profit/loss (in thousands of NTD): -90,708 5. Conditions for releasing endorsement and guarantee liability: (1) Conditions: According to contract terms (2) Date: According to contract terms 6. Total limit of endorsement and guarantee (in thousands of NTD): 10,170,464 7. Balance of endorsement and guarantee up to the date of occurrence (in thousands of NTD): 3,684,930 8. Ratio of endorsement and guarantee balance provided by A up to the date of occurrence to the net worth of the public company's most recent financial statements: 28.99 9. Ratio of the total balance of endorsement and guarantee, long-term investments, and loans to others up to the date of occurrence to the net worth of the public company's most recent financial statements: 107.63 10. Other matters that should be specified: None