TSMT Reports NT$4.377 Billion Consolidated Revenue for June 2026

Release Date: July 7, 2026 Statement Date: July 6, 2026 Statement Time: 16:55:21 Company Code: 6278 Company Name: TSMT Subject: TSMT's self-compiled consolidated revenue for June 2026 amounts to NT$4.377 billion Applicable Clause: Item 51 Factual Date: July 6, 2026 Explanation: 1. Factual Date: 07/06/2026 2. Company Name: Taiwan Surface Mounting Technology Co., Ltd. 3. Relationship with Company (Please enter '本公司' or 'Subsidiary'):本公司 4. Cross-shareholding Ratio: Not applicable 5. Reason for Occurrence: Monthly revenue announcement 6. Response Measures: Not applicable 7. Other Matters to be Disclosed (If the entity involved in the event or resolution is a publicly issued company or above, this major information also meets the criteria under Article 7, Paragraph 9 of the Enforcement Rules of the Securities and Exchange Act, regarding matters significantly affecting shareholder rights or securities prices): (1) Consolidated Operating Revenue (Comparison with Same Month Last Year) (Unit: NT$ Thousands)

Item June 2025 June 2026 Growth Rate% Consolidated Revenue 4,006,645 4,376,679 9.24%

(2) Consolidated Operating Revenue (Comparison with Previous Month) (Unit: NT$ Thousands)

Item May 2026 June 2026 Growth Rate% Consolidated Revenue 4,348,041 4,376,679 0.66%

(3) Cumulative Consolidated Operating Revenue (Unit: NT$ Thousands)

Item Jan-Jun 2025 Jan-Jun 2026 Growth Rate% Consolidated Revenue 25,001,879 25,785,584 3.13%

(4) The above figures are self-calculated by the company and have not been audited or reviewed by accountants.