A Resilient Future: Introducing the AdvanSix 2024 Sustainability Report

At AdvanSix, we are committed to building a more sustainable and socially responsible future. And we know that a resilient future starts with good chemistry. President and CEO Erin Kane reflects on the progress made over the past year.

To Our Stakeholders,

At AdvanSix, we believe that good chemistry is more than the foundation of our products-it's the catalyst for a more sustainable, resilient future.

As a diversified chemistry company, we recognize the vital role we play in the world and continue to advance our mission by delivering essential chemistries that support critical supply chains. In recognition of this, I am proud to share our 2024 Sustainability Report.

This year, while continuing to deepen our commitment to environmental stewardship, community engagement and operational excellence, we achieved several important milestones that reflect our values in action:

• As of early 2025, all of our manufacturing sites are now certified under the Responsible Care® RC14001 and ISO 14001 standards, reinforcing our dedication to safety and sustainability.
• We continued to advance our Sustainable U.S. Sulfate to Accelerate Increased Nutrition (SUSTAIN) initiative to help increase the domestic availability of fertilizer and nutrient alternatives for U.S. farmers.
• We were honored to receive our third consecutive Platinum rating from EcoVadis during 2024, placing us in the top one percent of companies assessed globally for corporate social responsibility.

Our people remain at the heart of our progress. From introducing the AdvanSix Living Safety Leadership Award to giving back in our hometown communities to continuing to invest in the next generation of leaders in chemistry, we are investing in a culture where safety, accountability, integrity and respect guide every decision. Our teammates show what's possible when purpose and performance align-whether it's improving stormwater systems, mentoring future STEM leaders or supporting local food banks.

I invite you to learn more about our commitments and our progress within this report. As we look ahead, we remain focused on driving innovation, strengthening our communities and delivering long-term value for all stakeholders. Thank you for your continued trust and partnership as we build a more sustainable tomorrow-together.

Sincerely,

Erin N. Kane

President and Chief Executive Officer

AdvanSix