TSMC Subsidiary Corrects Q1 2026 iXBRL Consolidated Financial Report Information

Date of Announcement: July 8, 2026 Date of Statement: July 7, 2026 Time of Statement: 15:35:07 Company Code: 3532 Company Name: Taiwan Semiconductor Silicon Corporation Subject: Correction of Certain Information in the Company's Q1 2026 iXBRL Consolidated Financial Report Applicable Clause: Clause 51 Factual Date: July 7, 2026

1. Factual Date: July 7, 2026 2. Company Name: Formosa Plastics Advanced Materials Corporation 3. Relationship with Company (Enter 'Company' or 'Subsidiary'): Company 4. Cross-shareholding Ratio: Not applicable 5. Reason for Occurrence: Correction of certain information in the Company's Q1 2026 iXBRL Consolidated Financial Report 6. Corrected Information Item / Report Name: iXBRL Information, Total Balance of Loans from Parent Company to Others 7. Amount / Content / Page Before Correction: 178,971 8. Amount / Content / Page After Correction: 370,000 9. Response Measures: The above correction does not affect profit or loss. The company will re-upload the iXBRL file after issuing a material information announcement. 10. Other Matters to be Disclosed: None.