NEWS RELEASE FOR IMMEDIATE RELEASE Avient Announces Registration Details for 2023 Sustainability Day CLEVELAND – August 28, 2023 – Avient Corporation (NYSE: AVNT), a leading provider of specialized and sustainable material solutions, has announced registration details for a virtual Sustainability Day for investment professionals on Wednesday, September 20, 2023, from 9 a.m. – 11 a.m. Beggs, Senior Vice President and Chief Financial Officer, Avient Corporation. A recording of the webcast and the slide presentation will be available at avient.com/investors/events-presentations shortly after the live webcast. http://www.avient.com/investors https://sustainabilityday2023.avient.com/ http://www.avient.com/investors https://register.vevent.com/register/BI0b9400e410674b9d9dc80471579b64b9 https://www.avient.com/investors/events-presentations About Avient Avient Corporation (NYSE: AVNT) provides specialized and sustainable material solutions that transform customer challenges into opportunities, bringing new products to life for a better world.

KEY CHARACTERISTICS • Derived from end-of-life tires • Available for multiple resins and custom solutions • Retains performance characteristics of traditional carbon black in plastics • Enhances sustainable product offerings • Provides long-term price stability • Passes REACH and RoHS requirements • Prop 65 letters available MARKET AND APPLICATIONS OnColor RC Environmental Black is a sustainable solution across a wide variety of industries and applications, including: • Automotive • Wire and cable • Building and construction • Appliances • Electrical and electronics • Industrial molding applications • Office furniture Avient OnColor RC Environmental Black is offered for multiple resins and also for custom solutions: CC10289240WE OnColor RC Environmental Black PE CC10284887WE OnColor RC Environmental Black TPU CC10287020WE OnColor RC Environmental Black PC CC10287026WE OnColor RC Environmental Black PS CC10287028WE OnColor RC Environmental Black PP CC10287033WE OnColor RC Environmental Black ABS www.avient.com Copyright © 2020, Avient Corporation.

KEY CHARACTERISTICS • Derived from recycled content including end-of-life tires • Available for multiple resins and custom solutions • Retains performance characteristics of traditional carbon black in plastics • Passes REACH and RoHS requirements • Prop 65 letters available • Certified by TÜV Rheinland • PCF calculation available on request MARKET AND APPLICATIONS OnColor REC Polymer Colorants are sustainable solutions across a wide variety of industries and applications, including: • Automotive • Wire and cable • Building and construction • Appliances • Electrical and electronics • Industrial molding applications • Office furniture 1.844.4AVIENT www.avient.com Copyright © 2024, Avient Corporation.

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PolyOne Corporation, with 2013 revenues of $3.8 billion, is a premier provider of specialized polymer materials, services and solutions. Company Officers

PolyOne Corporation, with 2013 revenues of $3.8 billion, is a premier provider of specialized polymer materials, services and solutions. Company Officers

ColorMatrix Europe Limited is a wholly owned indirect subsidiary of Avient Corporation, a U.S. publicly-traded corporation listed on the New York Stock Exchange with global headquarters in Avon Lake, Ohio, United States. Avient currently does not engage in verification of its supply chains to evaluate and address risks of human trafficking and slavery, nor does it currently conduct audits of its suppliers’ compliance with company standards for trafficking and slavery in supply chains. Our procurement and compliance teams will continue to focus on identifying and addressing any potential risks in our supply chain and the business will continue to provide awareness and training to all of its employees.

Für sonstige Geschäftsführer oder Mitarbeiter dürfen Rechtsverzichte nur durch den Corporate Ethics Officer im Einvernehmen mit den ordentlichen Mitgliedern des Ethikkomitees gewährt werden. Diese Offenlegungen sollten zur Auflösung dem Chefjustiziar oder dem Corporate Ethics Officer schriftlich vorgelegt werden. Ein unabhängiges Unternehmen empfängt alle über das Internet gemachten und telefonischen Meldungen der Ethikhotline und meldet die Informationen an den Corporate Ethics Officer.

Learn about overmolding, material selection to enhance function, and design considerations that can help you address challenges and delight customers