Introducing the All New Avient.com

FINANCIAL INFORMATION Security analysts and representatives of financial institutions are invited to contact: Joe Di Salvo Vice President, Treasurer and Investor Relations Phone: 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. AVIENT.COM VISION AND STRATEGY OUR CULTURE LETTER TO OUR SHAREHOLDERS FORM 10-K PART I ITEM 1.

Challenge Accepted. 2021 Sustainability Report AVIENT.COM http://www.avient.com http://AVIENT.com https://responsiblecare.americanchemistry.com/Guiding-Principles/ https://endplasticwaste.org/about/ https://www.greatplacetowork.com https://www.unglobalcompact.org https://www.newsweek.com/americas-most-responsible-companies-2022 https://www.hrc.org/resources/corporate-equality-index https://www.barrons.com/articles/most-sustainable-companies-51644564600 https://www.wsj.com/news/collection/management-top-250-december-2021-30a0ffe8 Message from the CEO Message from the Governance and Corporate Responsibility Committee Our Sustainability Strategy & Employee Engagement Strategy Execution & Proof of Performance 2030 Sustainability Goals Avient Reaffirms Commitment to U.N.

FINANCIAL INFORMATION Security analysts and representatives of financial institutions are invited to contact: Joe Di Salvo Vice President, Treasurer and Investor Relations Phone: 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. AVIENT.COM A V IE N T C O R P O R A T IO N A N N U A L R E P O R T 2021

Challenge Accepted. 2023 Sustainability Report AVIENT.COM http://www.avient.com http://www.AVIENT.com https://responsiblecare.americanchemistry.com/Guiding-Principles/ https://endplasticwaste.org/en https://unglobalcompact.org/ https://www.newsweek.com/rankings/americas-most-responsible-companies-2024 https://www.barrons.com/lists-rankings/top-sustainable-companies?

Challenge Accepted. 2023 Sustainability Report AVIENT.COM http://www.avient.com http://www.AVIENT.com https://responsiblecare.americanchemistry.com/Guiding-Principles/ https://endplasticwaste.org/en https://unglobalcompact.org/ https://www.newsweek.com/rankings/americas-most-responsible-companies-2024 https://www.barrons.com/lists-rankings/top-sustainable-companies?

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.

Challenge Accepted. 2023 Sustainability Report AVIENT.COM http://www.avient.com http://www.AVIENT.com https://responsiblecare.americanchemistry.com/Guiding-Principles/ https://endplasticwaste.org/en https://unglobalcompact.org/ https://www.newsweek.com/rankings/americas-most-responsible-companies-2024 https://www.barrons.com/lists-rankings/top-sustainable-companies?

Challenge Accepted. 2022 Sustainability Report AVIENT.COM http://www.avient.com http://www.AVIENT.com https://responsiblecare.americanchemistry.com/Guiding-Principles/ https://endplasticwaste.org/en https://unglobalcompact.org/ https://www.hrc.org/resources/corporate-equality-index https://www.barrons.com/articles/most-sustainable-esg-us-companies-1b5f70fd https://www.wsj.com/news/collection/management-top-250-december-2021-30a0ffe8 https://www.greatplacetowork.com https://www.usatoday.com/in-depth/news/nation/2023/05/24/climate-leaders-list-greenhouse-gas-emissions-ranking/70222728007/ https://www.newsweek.com/rankings/americas-most-responsible-companies-2023 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.