MKS is pleased to share its 2026 Environmental, Social, and Governance (ESG) Report. This report outlines how we continue to integrate sustainability considerations into our strategy, operations, and decision-making to support long-term value creation for our stakeholders.

At MKS, our innovative spirit, collaborative approach, and unwavering commitment to integrity and trust shape how we grow our business and deliver for customers. By focusing on solving our customers’ most complex technology challenges through advanced engineering and differentiated capabilities, we develop products and solutions that support performance, reliability, and efficiency across the industries we serve. These same priorities, operational excellence, risk management, and responsible growth, also underpin our sustainability efforts.

Throughout 2025, we continued to advance programs that improve efficiency, reduce resource use, and support safer, more reliable operations for our stakeholders. At the same time, we made targeted investments to strengthen our global footprint and enhance our proximity to customers. In 2025, we continued to progress on the construction of our new Supercenter Factory in Malaysia, which we opened in June 2026, and broke ground on a new chemical manufacturing and TechCenter facility in Thailand. These are strategic investments designed to expand localized manufacturing, technical service, and innovation capabilities in Southeast Asia. These facilities reflect our commitment to scaling alongside our customers and supporting regional growth through resilient, high-quality operations.

In addition, I am pleased to highlight several key ESG achievements since the beginning of last year:

• We received approval from the Science Based Targets initiative (SBTi) of our near-term Scope 1, 2, and 3 greenhouse gas (GHG) emissions reduction targets, reinforcing our approach to managing climate-related risks and opportunities.
• We generated approximately 1,500 MWh of electricity from a new rooftop solar installation at our Guangzhou, China equipment factory, avoiding nearly 900 tCO2e emissions annually and further supporting our GHG reduction goals.
• We conducted our fifth annual Global Employee Engagement Survey, achieving a record 91% participation rate, reflecting continued employee engagement and alignment as we evolve our business.
• We received a low ESG risk rating from Sustainalytics and were once again recognized as one of the Best Companies to Work For by U.S. News & World Report. We also were recognized as one of America’s Best Midsized Companies by Time and Statista, Inc., and one of America’s Most Responsible Companies by Newsweek and Statista, Inc.

As a key provider of foundational technologies in the connected world, we recognize our responsibility to operate with care, consistency, and accountability. We view this responsibility as part of how we manage risk, strengthen customer relationships, and position MKS for sustainable, long-term growth in a rapidly evolving global marketplace. Looking ahead, we remain focused on executing our strategy in a manner that aligns with stakeholder expectations, supports customer needs, and strengthens the resilience of our operations. We believe this approach enhances our ability to deliver lasting value over time while navigating an increasingly complex operating environment.

Thank you for your continued interest in MKS. Together with our employees, customers, partners, suppliers, and communities, we look forward to building on our progress toward a more sustainable future for all.

John T.C. Lee
President & Chief Executive Officer

• Executive Team & MKS Fellows
• Board of Directors
• Guiding Principles
• Business Ethics

• Employee Development Opportunities
• Global Culture & Belonging

• Commitment to Sustainable Business Practices
• Supporting Positive Environmental and Social Progress
• Philanthropy & Volunteerism

• Ground-breaking Solutions to Complex Technology Challenges
• Suppliers