Silicon Integrated Systems Announces Additional 2026 Budget Proposal for Subsidiary Silicon Integrated Testing Co., Ltd.

1. Date of Board or Shareholders' Meeting Resolution: 2026/07/27 2. Investment Plan Content: The company's board of directors has approved an additional budget proposal for the 2026 fiscal year. 3. Estimated Investment Amount: Additional budget of NT$2 billion 4. Estimated Investment Date: N/A 5. Source of Funds: Internal funds and bank financing 6. Specific Purpose: Purchase of machinery and equipment and cleanroom renovation and upgrade for a new project 7. Other Matters to be Disclosed: None