Responsible Minerals Compliance

To prevent the unintentional use of any conflict mineral such as tantalum, tin, tungsten and gold (3TG) from the Democratic Republic of the Congo and its neighboring countries, we have established the ASEH Corporate Policy for Sourcing Conflict Minerals, joined the Responsible Minerals Initiative (RMI), and participated in the RMI Mineral Reporting Templates (MRT) Teams and Due Diligence (DD) Practices Team to resolve conflict minerals issues in the supply chain and support responsible sourcing.

The mining and distribution of “conflict minerals” originating from the Democratic Republic of the Congo (the “DRC”) are sometimes controlled by violent organizations in order to fund conflict in that country and adjacent regions. Our industry supply chains are inadvertently subject to metals derived from these conflict minerals which can be introduced through the metals we use such as gold, tin, tantalum and tungsten. ASE Technology Holding Co., Ltd. and its subsidiaries (collectively, “ASE Technology Holding”) is dedicated to the elimination of these conflict minerals in our supply chain and to using only responsibly sourced “conflict-free minerals”. We expect our suppliers to source conflict-free minerals from smelters or refineries that have been certified by an independent third party audit program to fulfill our objective. It is also our objective to support the continued use of conflict-free minerals from the DRC and its adjacent regions such that responsible mining is not diminished. We exercise due diligence with our suppliers on the origin and supply chain of minerals in accordance with the “OECD Due Diligence Guidance for Responsible Supply Chains of Minerals from Conflict-Affected and High-Risk Areas” to establish conflict minerals management mechanism.

To protect the human rights, health and environment for workers in the material production areas, we commit to widening the scope of investigation and information disclosure; in addition to gold, tin, tantalum and tungsten, more minerals (such as cobalt and mica) will be included gradually from conflict-affected and high-risk areas (“CAHRAs”) in accordance with the Responsible Minerals Initiative (“RMI”) standards. ASE Technology Holding requires suppliers must support this policy by the following guidelines and widen their scope of investigations and disclosures to continuously strengthen our responsible sourcing programs.

• Being diligent in their assessment and validation of their supply chains to ensure ASE Technology Holding’s objectives of a transparent supply chain and conflict-free purchases are inputs to the services and products we produce.
  

• Be in compliance at all times with all regional and international regulations for conflict minerals.
  

• Be in compliance at all times with industry standards for the sourcing and reporting of conflict minerals.
  

• Being diligent and accurate in their formal assurances of conflict-free minerals provided to us.
  

ASEH’s due diligence framework was established in accordance with the guiding principles of the Organization for Economic Co-operation and Development (OECD)Due Diligence Guidance for Responsible Supply Chains of Minerals from Conflict-Affected and High-Risk Areas (“the OECD Due Diligence Guidance”). Our due diligence procedure is designed to identify and assess the risks associated with our suppliers, address and mitigate any identified risks, and evaluate alternatives to minerals sourced from conflict-affected and high-risk areas. We have developed a conflict minerals audit checklist for suppliers in accordance with the OECD Due Diligence Guidance. We also conduct on-site and document-based audits to support suppliers in establishing management practices aligned with the OECD guidance.

In 2025, we completed due diligence on 467 suppliers, identifying 233 SoRs used by these suppliers. We have determined that 100% of our suppliers are compliant with the requirements of ASEH’s conflict minerals policy. In 2018, the scope of our due diligence was expanded beyond 3TG minerals to include cobalt and mica. The list was further expanded in 2023 to include copper, iron, nickel, and aluminum. In addition, we disclose relevant SoR information according to customer requirements, ensuring supply chain transparency and enhancing our responsible mineral procurement and due diligence management.