New suppliers of the Company are required to meet basic corporate social responsibility assessments, covering human rights, occupational health and safety, and environmental management. Business cooperation with the Company may only commence after passing the assessment. Subsequently, suppliers meeting the transaction criteria are also required to complete the “Supplier/Contractor Sustainability Risk Assessment Questionnaire.” Therefore, the percentage of new suppliers screened using environmental standards and social criteria is 100%. At present, SStek only requires new suppliers to sign a Supplier Commitment Letter and has not yet applied social and environmental criteria for screening new suppliers.

The Group stipulates in procurement contracts with suppliers that they must comply with the RBA Code of Conduct. Each year, based on transaction criteria set by the Production Management and Procurement Departments, existing suppliers are required to complete the “Supplier/Contractor Sustainability Risk Assessment Questionnaire,” which covers five areas: labor, occupational health and safety, environmental protection, supply chain management, and corporate governance. The Group’s quality assurance personnel conduct a secondary review and classify suppliers’ sustainability risk levels based on their scores. Subsequent supply chain management and optimization are carried out based on suppliers’ long-term sustainability performance.

In 2025, a total of 76 suppliers were assessed for environmental and social impacts through the “Supplier/Contractor Sustainability Risk Assessment Questionnaire.” Among them, 2 suppliers were identified as having significant actual or potential negative impacts on the environment or society. The primary risks included incomplete policies, lack of environmental management plans, and absence of supplier management systems. Both suppliers have not yet committed to corrective actions (0% of suppliers agreed to improvements). The Procurement Department will continue to monitor the progress of non-compliant suppliers over the next two years. The percentage of supplier relationships terminated following assessment in the current year was 0%.

At the same time, the Group identifies key suppliers based on factors such as procurement amount, delivery frequency, and supply nature, in accordance with risk assessment results. Key suppliers are required to sign the “RBA Supplier Code of Conduct” (with a 100% signing rate) and to undergo an annual RBA audit conducted by the Group’s professional personnel. In addition, the Group emphasizes enhancing suppliers’ sustainability management capabilities. Through RBA audit briefings and training courses, suppliers are educated on topics including the prohibition of child labor, human rights, anti-discrimination/anti-harassment, health and safety, pollution and greenhouse gas management, anti-corruption, grievance mechanisms, privacy, management systems, material restrictions, and responsible mineral sourcing. These efforts aim to strengthen sustainability awareness across the entire supply chain. In 2025, a total of 25 suppliers participated in the annual supplier training program.

In addition, Employees in departments with procurement functions related to core business operations (Production Management and Procurement Departments) are required to complete the annual “Sustainable Supply Chain – Role Awareness and Capability Development Course.” The course covers topics including the definition and importance of sustainable supply chain management, the relationship between procurement behavior and the era of carbon pricing, product carbon footprint and organizational carbon emissions, and sustainable raw materials , with the aim of enhancing the sustainable supply chain management capabilities of relevant personnel.