In accordance with the five principles of the AA1000 SES Stakeholder Engagement Standard, and after internal discussions and reference to the industry's stakeholder identification and engagement methods, six internal and external stakeholder groups were identi¬fied. To further master each stakeholder and assess the impact of each sustainability issue, PSMC designed questionnaires to be completed by internal and external stakeholder groups, and the results of stakeholder negotiations and impact assessments of signifi¬cant issues are reviewed by the Sustainable Development Committee chairman and presented to the Board of Directors.

Stakeholders Importance of Stakeholder Top five impact issues (Total
positive and negative impacts) 		Communication channel and frequency/
Quantitative counting in 2025 		Effectiveness of communication in 2025
Employees Employees are the most valuable assets of PSMC, and they are also the most solid elite forces driving our production and operation. We will dedicate ourselves to improving the benefits system and promoting workplace protection, seeking and retaining talents, creating a friendly workplace and a win-win situation for both labor and management.
  • Product Liability and Quality
  • Customer Relationship Management
  • Energy Management
  • Talent Attraction and Retention
  • Information Security

【Regularly】

  • Health Consultation with Health Service Physicians and Occupational Specialists (Weekly), total 300 times
  • Occupational Safety, Health and Environment Committee Meetings (Quarterly) , total 24 times
  • Quarterly Meeting (Quarterly) , total 4 times
  • Labor-management meetings ( Quarterly), welfare committee meetings (Quarterly) , total 8 times: to make suggestions and negotiate with the company

【Irregularly】

  • Announcements and inquiries on the PSMC official website (in real-time)
  • Partner's Words /employees care network (at any time)
  • Grievance hotline (at any time): Assist and handle issues raised by and received from employees
  • Employee feedback (at any time) and setting up suggestion boxes
  • Human Resources Recruiting Line on the PSMC official website (at any time) (https://www.powerchip.com/zh-tw/contact)
  • Human Resources Interviewer Phone/e-mail (at any time)
  • Accepted total of 662 "Partner's Words"
  • Accepted 0 cases through "Grievance hotline"
  • Received 3 case of "Employee Feedback" (The above all response rate are 100%)
Customers The satisfaction of our customers and their feedback on our services are the driving force for our continuous efforts and growth.
  • Talent Attraction and Retention
  • Product Liability and Quality
  • Information Security
  • Economic Performance
  • Ethical management

【Regularly】

  • Customer Satisfaction Survey (Annually) , total 1 times

【Irregularly】

  • Customer service telephone/mailbox (at any time)
  • Participate in relevant product exhibitions to gain first-hand knowledge of our customers and the direction of market development (at any time)
  • Marketing and sales colleagues visit customers (at any time)
  • Customers satisfaction score of 96.1
Government/Authorities The competent authorities are the supervisors of company operations related to regulations, and compliance governance is the primary responsibility of corporate management.
  • Air Pollution Control, and Regulatory Compliance(above 2 topics have the same score)
  • Product Liability and Quality
  • Ethical management, Occupational Safety and Health, and Economic Performance (above 3 topics have the same score)

【Irregularly】

  • Maintain good interaction with competent authorities and actively participate in seminars and workshops organized by the competent authorities (at any time)
  • Management System Regulations Identification (at any time)
  • Correspondence, project meetings, public information (at any time)
  • Participate in the operation of the functional organizations of the Hsinchu Science Park and the Hsinchu Science Park Administration (at any time)
  • Won 9 awards from the competent authorities for environmental safety and health
  • No major incidents of violations occurred
  • Participated in conferences organized by the competent authorities , total 29 times
Shareholders / Investors All of the capital of PSMC is funded by shareholders and investors, and it is the basic responsibility of the company to protect the interests of the shareholders
  • Economic Performance
  • Talent Attraction and Retention
  • Air Pollution Control
  • Information Security
  • Ethical management

【Regularly】

  • In accordance with laws regular publication of operational information (Monthly), financial reports (Quarterly) , and annual reports (Annually)
  • Convene a shareholders' meeting (Annually)

【Irregularly】

  • A special area for investors is set up on the official website (in real time) (https://www.powerchip.com/zh-tw/staticpage/ir_contact)
  • Set up dedicated contact window and mailbox for shareholders (at any time)
  • A spokesperson contact window is available (at any time)
  • Held regular shareholders' meeting on May 27, 2025
  • No incidents of corruption occurred
Suppliers / Contractors As a global team of professionals, PSMC maintain the quality of our supply chain through the evaluation of our supplier management system. The contractors are co-operative partners of PSMC, and share the prosperity with PSMC in terms of business promotion and work quality.
  • Customer Relationship Management
  • Product Liability and Quality
  • Occupational Safety and Health
  • Ethical management
  • Risk Management

【Regularly】

  • Contractor Agreement Meeting (Quarterly) , total 40 times
  • Supplier Evaluations (Semiannually) , total 2 times
  • Contractor Appraisal (Annually ) , total 1 times

【Irregularly】

  • Supplier Conferences (irregularly)
  • E-Supplier System (at any time)
  • Sustainability Management Self-Assessment Questionnaire (Implemented for the first time in 2023)
  • 100% completion of raw material supplier evaluations
  • 100% completion of preliminary survey and audit of new suppliers
  • 100% use of conflict-free minerals
  • 100% of critical suppliers signed the Responsible Business Alliance (RBA) pledge
Social / Local Communities The operational sites in the Science Park are located in close proximity to each other and maintain good communication and contact with the neighboring plants to collectively maintain the safety and environment of the Science Park.
  • Air Pollution Control
  • Talent Attraction and Retention, Ethical management, Regulatory Compliance, and Customer Relationship Management (above 4 topics have the same score)

【Irregularly】

  • Weekday Visits and Telephone Communication (at any time)
  • Official Company Website (at any time)
  • Participate in Association Group Activities or Symposiums (at any time)
  • Participate in External Guild /Association Functions (at any time)
  • Participated in Taiwan Semiconductor Industry Association annual meeting 1 time.
  • Attended a variety of professional committee meetings organized by the Allied Association for Science Park Industries , total 3 times.
  • Participated in 27 investor events in 2025, with approximately 1,005 participants.
  • Engaged in 3 media-related events in 2025, reaching approximately 200,000 people