[Jing Jin] Announcement of Disposal of Tainan Factory Plant and Facility Ancillary Facilities (Supplementary Explanation)

1. Name and nature of the asset (e.g., land in XX section, XX subsection, Beitun District, Taichung City): Building and factory ancillary facilities at No. 7, Beiyuan 1st Road, Shanhua District, Tainan City. 2. Date of occurrence of the event: 2026/4/30~2026/4/30 3. Date of board approval: April 30, 2026 4. Other approval dates: Not applicable 5. Quantity of transaction units (e.g., XX square meters, equivalent to XX pings), unit price, and total transaction amount: Building area: 93,974.82 square meters (equivalent to 28,427.38 pings) Total transaction amount: NT$6.48 billion (This supplementary item) 6. Counterparty and its relationship with the company (if the counterparty is a natural person and not a related party of the company, their name may be omitted): Counterparty: Siliconware Precision Industries Co., Ltd. Relationship with the company: Not a related party 7. If the counterparty is a related party, the reasons for selecting the related party as the transaction object, the previous owner, the relationship between the previous owner and the company and the counterparty, the previous transfer date, and the transfer amount should also be announced: Not applicable 8. If the owner of the transaction asset has been a related party of the company within the past five years, the related party's acquisition and disposal dates, prices, and their relationship with the company at the time of the transaction should also be announced: Not applicable 9. Estimated disposal profit (or loss) (not applicable to asset acquisition) (for deferred items, a list should be provided explaining recognition status): Estimated disposal profit of approximately NT$4.06 billion. (Actual disposal profit will be recognized after the transaction is completed and relevant expenses are deducted). 10. Delivery or payment terms (including payment period and amount), contractual restrictions, and other important agreements: As stipulated in the asset sale agreement signed by both buyer and seller. 11. Method of determining this transaction (e.g., tender, price comparison, or negotiation), reference basis for price determination, and decision-making unit: Method of determining the transaction: Negotiation Reference basis for price determination: Disposal price refers to professional appraisal reports and market information. Decision-making unit: Board of Directors 12. Name of professional appraiser's firm or company and its appraisal amount: China Real Estate Appraisers & Consultants/China Asset Appraisal Center (Co., Ltd.) Appraisal amount: approximately NT$6.51 billion Hong Bang Real Estate Appraisers & Consultants/Hong Bang Asset Consulting (Co., Ltd.) Appraisal amount: approximately NT$5.95 billion 13. Name of professional appraiser: China Real Estate Appraisers & Consultants/China Asset Appraisal Center (Co., Ltd.): Hsieh Tien-ching / Yang Kuang-wu Hong Bang Real Estate Appraisers & Consultants/Hong Bang Asset Consulting (Co., Ltd.): Li Ching-tang / Lo Ying-yuan 14. Professional appraiser's license number: China Real Estate Appraisers & Consultants: (99) Taipei City Appraisal No. 000149 Hong Bang Real Estate Appraisers & Consultants: (108) Taipei City Appraisal No. 000278 15. Is the appraisal report a limited price, specific price, or special price: No or Not applicable 16. Has the appraisal report not yet been obtained: No or Not applicable 17. Reason for not yet obtaining the appraisal report: Not applicable 18. If there is a significant difference in the appraisal results, the reasons for the difference and the auditor's opinion: Not applicable 19. Name of accounting firm: Not applicable 20. Name of accountant: Not applicable 21. Accountant's license number: Not applicable 22. Broker and brokerage fees: Not applicable 23. Specific purpose or use of acquisition or disposal: To inject operational and future development momentum into the company and to replenish operating capital. 24. Opinions of directors who dissented from this transaction: Not applicable 25. Is this transaction a related party transaction: No 26. Date of approval by supervisors or audit committee: Approved by the Audit Committee on April 29, 2026 27. Is this transaction the acquisition of real estate or its right of use from a related party: No 28. Price evaluated in accordance with Article 16 of the "Regulations Governing the Acquisition and Disposal of Assets by Publicly Issued Companies": Not applicable 29. If the price evaluated in the preceding paragraph is lower than the transaction price, the price evaluated in accordance with Article 17 of the same regulations: Not applicable 30. Date of previous material information announcement for the same event: April 30, 2026 31. Other matters to be specified: (1) This transaction was approved by the Audit Committee on 2026.04.29 and then submitted to the Board of Directors on 2026.04.30 for resolution. (2) The formal contract for this transaction will be signed after its approval by the company's shareholders' meeting on 2026.06.12 (This supplementary item).