ASEH is committed to partnering with our worldwide suppliers to ensure the provision of a safe work environment, respect for workers, environmental protection, and ethical conduct, and actively applied to sustainability management in the supply chain.
As part of the ASEH Procurement and SupplyChain Development Policy and Commitment, we established a four-stage sustainability supply management process that is run repeatedly to ensure supplier compliance and enhance their sustainability performance. We have also established a series of supplier programs that aim to guide, and help build up our suppliers’ ESG capabilities, so as to create a more sustainable supply chain together. We have also formulated mechanisms to closely monitor ESG performance for rewarding or disengaging with suppliers.
ASEH is committed to continuously improving the sustainability and resilience of its supply chain. We incorporate ESG indicators into the evaluation of key raw materials and critical suppliers, accounting for 10%. ESG indicators are integral factors influencing our selection in addition to quality, cost, delivery time, and technology. We drive our suppliers diligently to adopt sustainable practices through proactive management strategies. Suppliers with the best ESG performance are recognized at our annual supplier day, and invited to share their expertise in sustainability development with other suppliers at the annual supplier forum. Outstanding suppliers also receive priority in our procurement selection policy.
As we race towards net-zero, enhancing the integrity of carbon emissions data and targeted reduction measures across the supply chain are key approaches to our supply chain decarbonization. Our strategy comprises 5 key pillars: establishing low-carbon strategies, enhancing carbon data transparency, driving low-carbon supply chain transformation, implementing low-carbon transportation solutions, and building a low-carbon supply chain.
We have established a sustainable supply chain development plan that aims to keep suppliers abreast of global sustainability trends and strengthen their ESG management capabilities by integrating sustainability principles into their daily operations and management culture. The plan is carried out through a series of engagement and capacity-building programs that foster stronger supply chain partnerships, and strengthen agility to address environmental and sustainability challenges. Sustainability forums, sustainability education, ESG workshops, and systematic training programs are organized on an annual or regular basis, providing opportunities for suppliers to exchange and share resources, knowledge, and experiences.

In 2025, USI hosted its annual sustainability forum online. Suppliers were invited to join discussions on sustainability topics. Over 380 people participated in the event.
This year, the forum covered topics ranging from sustainability management requirements, green products to responsible supply chains and carbon management. During the forum, suppliers received updates on the company’s sustainability management requirements and practices, including green product management, conflict mineral policies and management approaches, and RBA requirements. Other sessions presented included the sharing of ESG practices, experiences and point of views, and a special topic discussion on “Carbon Management and the Path to Net Zero 2.0”.

Since 2021, ASE Kaohsiung has been driving a capacity building program with suppliers to drive GHG and water consumption toward a 3% reduction target. In 2025, a total of 32 suppliers participated in the program - setting reduction targets, developing improvement solutions and tracking progress, to improve their performance in environmental management.
In 2025, we recorded a cumulative reduction of 12,875 tons CO₂e or 3.41% in GHG emissions and a total reduction of 28,425 tons or 4.69% in water consumption, both of which exceeded the annual 3% reduction target.
In the same year, we further calibrated resources from experts in equipment, plant operations, energy management, and carbon management to organize online technology exchanges, site visits, training classes and other programs. We aim to continuously help our suppliers to identify carbon emission hotspots, analyze improvement opportunities, and recommend carbon reduction and water conservation measures.
Digital transformation across the supply chain is driving a substantial increase in data exchange, while also heightening cybersecurity risks. To address these challenges, we are tightening our supplier information security assessment framework. We manage critical suppliers through the following steps - current status assessment, guidance and improvement, result validation and periodic survey. Questionnaires, written reviews, on-site visits and technical evaluations are used to help suppliers improve the maturity of their information security management. Our goal is to build a comprehensive information security framework that strengthens the ability of suppliers to protect themselves against cybersecurity risks while reducing overall supply chain risks, and increasing supply chain resilience.

ASE – Kaohsiung
Target: Raw material supplier, Equipment supplier
In 2025, we collaborated with the Kaohsiung City Net Zero Institute to launch a supplier sustainability empowerment program, in alignment with ASE Kaohsiung’s ‘Supplier ESG Sustainability Academy’. The program helped enable 28 suppliers and 74 green-collar workers to obtain ISO 14064, ISO 14067 and ISO 50001 certifications, improving their professional skills in GHG inventory, product carbon footprint, and energy management.
ASE Kaohsiung has also developed an online ESG learning platform that offers different types of multimedia courses for suppliers to attend at their own pace and convenience. Instructors from different fields of studies were invited to co-design a six-session ESG course tailored to suppliers’ varying levels of maturity. The course is available at three levels: foundational, intermediate, and advanced, and suppliers are required to complete at least 4 hours of lessons each year. The course outcome is measured through data analysis, and feedback from post-course questionnaires helps identify any additional training needs or gaps for us to calibrate the course content, or further training support for specific suppliers to improve their ESG capacity.
ASE – Kaohsiung
Target: Raw material supplier
We curate a series of workshops and forums covering topics on energy-saving technologies, carbon reduction strategies and solutions, case studies and best practices. These programs are aimed at boosting our suppliers’ efforts in energy management and low-carbon transition. At these sessions, participants learn from experts and peer experiences. The information on the latest technologies and case studies enable suppliers to keep abreast of current trends in energy management and low-carbon transition.
ASE – Kaohsiung
Target: Raw material supplier, Equipment supplier
The Sustainable Supply Chain Technology Exchange Forum is focused on key issues including energy conservation, energy efficiency and carbon emissions. It is designed as a platform for suppliers to share their experiences and exchange ideas on technologies and innovation in building carbon inventories, energy conservation and carbon reduction. The forum was also an opportunity for us to launch our Equipment Energy Management White Paper. This is a joint initiative to develop next-generation low-energy, and high-efficiency equipment with selected equipment suppliers. At ASEH, we are focused on supporting our suppliers to promote the application of energy-saving, carbon-reducing technologies and practices to accelerate the transition to a low-carbon, sustainable supply chain.
ASE – Kaohsiung, Chungli, ASE Shanghai (Material), Wuxi, and South Korea
SPIL
USI
Target: Raw material supplier, Facility, and Waste management supplier, Recruitment agency and Service provider
Governance and Management
Sustainable management
Responsible minerals and conflict minerals management
Environmental Management and Climate Actions
Conducting GHG inventories and building carbon management capabilities
Pollution control management and improvement measures
Waste management and resource recycling
Occupational Safety and Health and Risk Management
Promotional information on health and safety, food safety, and EHS policies
Fire safety management knowledge, fire emergency response, and fire drills
Hazardous chemicals management, site access regulations, and hazard identification