Additional performance commentary is provided in the Company Operating Performance section of this proxy statement, on the Investor Relations section of avient.com, in our 2021 Annual Report and during our quarterly earnings conference calls.

FINANCIAL INFORMATION Security analysts and representatives of financial institutions are invited to contact: Joe Di Salvo Vice President, Treasurer and Investor Relations Phone: 1-440-930-1921 Email: giuseppe.disalvo@avient.com AUDITORS Ernst & Young LLP 950 Main Ave., Suite 1800 Cleveland, OH 44113 INTERNET ACCESS Information on Avient’s products and services, news releases, corporate governance, EDGAR filings, Reports on Forms 10-K and 10-Q, etc. as well as an electronic version of this annual report, are available on the Internet at www.avient.com.

Challenge Accepted. 2023 Sustainability Report AVIENT.COM http://www.AVIENT.com https://responsiblecare.americanchemistry.com/Guiding-Principles/ https://endplasticwaste.org/en https://www.greatplacetowork.com Strategic Partnerships and Alliances Protecting Our Planet Climate Change Reducing Emissions Across Our Value Chain Climate Risks & Opportunities Eliminating Plastic Waste Clean-Up and Remediation Water Stewardship Biodiversity Conventional Committed to the Planet Community Service and Charitable Contributions Earth Day Photo Contest PERFORMANCE Performance Overview Message from the CEO Message from the Governance and Corporate Responsibility Committee Our Sustainability Strategy Sustainability Performance & Recognition 2030 Sustainability Goals and Current Progress Avient Reaffirms Commitment to U.N.

Additional performance commentary is provided in the Company Operating Performance section of this proxy statement, on the Investor Relations section of avient.com, in our 2022 Annual Report and during our quarterly earnings conference calls.

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