FINANCIAL INFORMATION Security analysts and representatives of financial institutions are invited to contact: Joe Di Salvo Vice President, Investor Relations Phone: 440-930-1921 Email: giuseppe.disalvo@polyone.com AUDITORS Ernst & Young LLP 950 Main Ave., Suite 1800 Cleveland, OH 44113 INTERNET ACCESS Information on PolyOne’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.polyone.com.

DeLuca Vice President, Investor Relations Phone: 440-930-1226 Fax: 440-930-1446 Email: isaac.deluca@polyone.com AUDITORS Ernst & Young LLP 950 Main Ave., Suite 1800 Cleveland, OH 44113 INTERNET ACCESS Information on PolyOne’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.polyone.com.

29/6/2021 Formulario de Impresión de Constancia de Inscripción https://seti.afip.gob.ar/padron-puc-constancia-internet/ConsultaConstanciaAction.do 1/1 ADMINISTRACION FEDERAL DE INGRESOS PUBLICOS CONSTANCIA DE INSCRIPCION AVIENT ARGENTINA S.A.

For more on material solutions for snowmobiles, visit avient.com © 2025, All Rights Reserved Avient Corporation, 33587 Walker Road, Avon Lake, Ohio USA 44012 EXTENDED PERFORMANCE Minimize Moisture Uptake from Melted Snow SOLUTION: Moisture-Resistant Long Fiber Reinforced Composites, Corrosion-Resistant Additives TACTILE EXPERIENCE Soft Touch Feel, Durable Performance, Lower Thermal Conductivity than Metals SOLUTION: Thermoplastic Elastomers (TPEs), Long Fiber Reinforced Composites THERMAL MANAGEMENT & SAFETY Heat Dissipation, Design Flexibility, Flame Retardancy SOLUTION: Thermally Conductive Formulations, Flame Retardant Additives HIGH IMPACT DURABILITY High Strength-To-Weight Ratio, Elevated and Low Temperature Performance SOLUTION: Long Carbon Fiber Reinforced Composites, Continuous Fiber Reinforced Thermoplastic Tape & Laminates COLD TEMPERATURE PERFORMANCE Cold Temperature Flexibility and Toughness SOLUTION: Thermoplastic Elastomers (TPEs), Long Fiber Reinforced Composites, Impact Modifiers WEIGHT REDUCTION 40–50% Lightweighting Compared to Metal, Exceptional Structural Properties, Extremely High Stiffness and Strength from -40° to 160°F SOLUTION: Long Carbon Fiber Reinforced Composites, Chemical Foaming Agents AESTHETIC APPEAL Custom Color and Special Effects, Paint Replacement, Color Fade Protection SOLUTION: Custom Polymer Colorants, UV Blocking Additives, Antioxidant Additives, Molded-In-Color Metallics, Scratch and Mar Performance, Laser Marking, Pre-Colored High-Gloss Thermoplastics https://www.avient.com/industries/consumer/consumer-discretionary/outdoor-recreation/powersports https://www.avient.com/products/long-fiber-technology/complet-moisture-resistant-nylons https://www.avient.com/products/polymer-additives/corrosion-resistant-additives/cesa-cor-additives https://www.avient.com/products/thermoplastic-elastomers/versaflex-thermoplastic-elastomers https://www.avient.com/products/long-fiber-technology https://www.avient.com/products/engineered-polymer-formulations/conductive-signal-radiation-shielding-formulations/therma-tech-thermally-conductive-formulations https://www.avient.com/products/polymer-additives/colorants-and-additives-wire-cable/cesa-flame-retardant-additives https://www.avient.com/products/long-fiber-technology/complet-long-carbon-fiber https://www.avient.com/products/advanced-composites/continuous-fiber-composite-tape-laminates-and-barstock/polystrand-continuous-fiber-tapes-laminates https://www.avient.com/products/thermoplastic-elastomers/onflex-thermoplastic-elastomers https://www.avient.com/products/long-fiber-technology https://www.avient.com/products/polymer-colorants/color-additive-combination-masterbatches/smartbatch-combination-colorants-additives https://www.avient.com/products/long-fiber-technology/complet-long-carbon-fiber https://www.avient.com/products/polymer-additives/foaming-agents https://www.avient.com/products/polymer-colorants/solid-color-masterbatches/oncolor-fx-special-effect-colorants https://www.avient.com/products/polymer-additives/uv-and-light-blocking-additives/cesa-light-additives https://www.avient.com/products/polymer-additives/antioxidant-additives https://www.avient.com/products/polymer-colorants/color-additive-combination-masterbatches/smartbatch-fx-paint-replacement-0 https://www.avient.com/products/polymer-additives/visual-enhancement-effects/cesa-scratch-mar-resistance-additives https://www.avient.com/products/polymer-additives/colorants-and-additives-wire-cable/cesa-laser-additives https://www.avient.com/products/engineered-polymer-formulations/general-engineered-formulations/artisan-pre-colored-thermoplastics-premium-finishes

The Avient GLS™ product families that include styrenic TPEs are Versaflex™, Dynaflex™, OnFlex, Versalloy™ and Versollan™. The shrinkage values reported by Avient are determined using a 0.125” thick plaque. With new innovative technologies, Avient continues to develop TPEs that bond to a variety of substrates.

Avient makes no warranties or guarantees respecting suitability of either Avient’s products or the information for your process or end-use application. AVIENT MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, either with respect to the information or products reflected by the information. To learn more about Specialty Engineered Materials, contact Avient at +86 (0) 21 6028 4888 www.avient.com

AVIENT CORPORATION COMPENSATION COMMITTEE CHARTER Membership • The Compensation Committee (“Committee) of the Board of Directors (“Board”) of Avient Corporation (“Company”) shall consist of a minimum of three directors. • The Committee will consist entirely of directors who the Board has determined have no material relationships with the Company, either directly or as a partner, shareholder, or officer of an organization that has a relationship with the Company, and: o who meet the definition of “independent” as set forth in the Corporate Governance Standards of the New York Stock Exchange; and o qualify as “non-employee directors” for the purposes of Rule 16b-3 under the Securities Exchange Act of 1934, as amended (the “Exchange Act”). • Each Committee member will serve at the pleasure of the Board for such term as the Board may decide or until such Committee member is no longer a Board member.

Revision:1 For Bureau Veritas Certification Holding, Le Triangle de l'Arche, 8 Cours du Triangle - 92800 Puteaux - France Bureau Veritas Certification Certificate N°: FR072877- IATF IATF Certificate N°: 442787 Date Of Expiration: 01-February-2025 Date Of Certification: 02-February-2022 Route de la Vavrette, 01250, TOSSIAT France PolyOne France Tossiat Awarded to Appendix to the Certificate of Approval Name Address Scope AVIENT LUXEMBOURG ROUTE DE BASTOGNE, 19, 9836, POMMERLOCH Luxembourg Logistic, Supplier Management, Purchasing PolyOne Europe Logistics 7 rue Blériot, 4460, GRACE HOLLOGNE Belgium Warehousing Polyone Europe ul.

Migdałowa 4, 02-796 Warszawa, Polska certifies that AVIENT Luxembourg S.à.r.l 14 Avenue de l’Eguillette, 95310 Saint Ouen L’Aumône FRANCE (operating under a tolling agreement) complies with the requirements of the certification system ISCC PLUS (International Sustainability and Carbon Certification) This certificate is valid from 30.12.2024 to 29.12.2025.

Avient Corporation Corporate Governance Guidelines The Board of Directors (the “Board”) of Avient Corporation (the “Company”) has adopted the following Corporate Governance Guidelines (the “Guidelines”). March 6, 2024 Avient Corporation Corporate Governance Guidelines 1.