September 20, 2023 (NYSE: AVNT)Avient Sustainability Day AGENDA WELCOME INTRODUCTION SUSTAINABILITY STRATEGY Walter Ripple SUSTAINABLE SOLUTIONS Michael Garratt, Chris Pederson, Woon Keat Moh SUMMARY WRAP UP AND Q+A Avient Corporation 2 Forward-Looking Statements Certain statements contained in or incorporated by reference into this presentation constitute “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. LAND-BASED) Avient Corporation 58 Solar Power Wire and Cable Syncure™ and ECCOH™ Photovoltaic Polymers • Supports installation of sustainable infrastructure for renewable energy • Reduces energy consumption vs. radiation cross-linking process • Extends useful life for cables EXTENDS PRODUCT LIFE Alternative Energy 2022 Revenue: $26M Wind Turbine Towing Lines Dyneema® Rope • Weightless when submerged • Smaller diameter for equal strength = larger winch capacities • Reduces drag for improved towing STRONGER THAN STEEL 15x Wind Blade Root Stiffener Glasforms™ Composites • Provides enabling technology that supports adoption of alternative energy • Withstands fatigue for extended product life ENABLES WIND ENERGY Avient Corporation 59 “We believe that sustainability and innovation go hand-in-hand and the team at Harley- Davidson is excited about Avient’s recently launched Bio-Based TPE for our handlebar grips.” Per Carlsson, Manufacturing and Operations Avient Corporation 71 80 2022 2030 Medical Plastics Market Size PRESERVE – TAKEAWAY Protecting Human Life and Enabling Connectivity Drives Growth Projections Examples Covered 56% Other Applications 44% 2022 $525M (in $ Bi lli s) 8% CAGR 34% CAGR 5G Infrastructure Market Size 12 92 10 70 80 2023 2024 2025 2026 2027 2028 2029 2030 (in $ Bi lli s) Source: Grand View Research Source: Global Data Summary Senior Vice President and Chief Financial Officer Avient Corporation 72 OUR SUSTAINABILITY REPORT Avient Corporation 73 Avient Corporation 74 2030 SUSTAINABILITY GOALS Avient Corporation 75 PERFORMANCE AND RECOGNITION 1 2 5 ESG Ratings Performance ESG Awards and Certifications top 13% 94th percentile Avient Corporation 76 SUSTAINABILITY INNOVATION AWARDS Ultra-Low Carbon Footprint TPE Innovation Award, Finalist: PCR Colorants + Additives Sustainable Packaging Innovation, Finalist: U.S.

New LSFOH Formulation from Avient Helps Prevent Environmental Stress Cracking in Armored Cables Avient’s new ECCOH™ 5983 Formulation helps prevent stress cracking in low and medium-voltage armored power cables.

POWER CABLE PRODUCER C A B L E I N S U L A T I O N • Easy to process • To pass CPR fire test • Low smoke and toxicity values on smoke test • Possibilities for low-voltage cables • Cable insulation that passed G18 of the CEI EN 50363-0: 2015 standard • Offered Sioplas technology for cross-linking providing ambient curing • Delivered new cable design possibilities for low- voltage cables while offering easy processing • Processed more efficiently than market- established elastomeric technology which is processed using a CV line • Provided cable insulation that passes the hot set test at 250°C ECCOH XL Cross-Linkable Solutions 8054 KEY REQUIREMENTS WHY AVIENT? AVIENT SOLUTION NEW CABLE DESIGN POSSIBILITIES LEARN MORE Copyright © 2025, Avient Corporation. All Rights Reserved https://www.avient.com/products/engineered-polymer-formulations/sustainable-formulations/eccoh-xl-cross-linkable-solutions Power cable producer

AVIENT CORPORATION I N V E S T O R P R E S E N T A T I O N (NYSE: AVNT) AU G U S T 2 0 2 3 DISCLAIMER Forward-Looking Statements Certain statements contained in or incorporated by reference into this presentation constitute “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. We partner with Brand Owners / OEMs, processors and assemblers to enable their goals in applications like packaging, healthcare, consumer goods, transportation, wire & cable, building & construction and textiles. GUIDANCE 12 15.4% 15.9% Adjusted EBITDA Margin % Better-than-expected margins driven by: • Favorable mix - strong demand for composite applications • Raw material deflation Q2 EBITDA BRIDGE 13 ($ millions) CAI: Price / Mix 7) Deflation 11) SEM: Price / Mix 2) Deflation 6) Net Price Benefit 26) Wage and Energy Inflation (10) Cost Reductions 13) FX (2) Q2 2023 Actual $131) Adjusted EBITDA Q2 2022 Pro Forma $ 172) Demand (68) • Demand conditions vs. expectations: LATAM • Net price benefit remains greater than wage and energy inflation • Clariant synergies and reduced administrative costs Q2 2023 SEQUENTIAL SALES BY REGION Q 2 2 0 2 3 v s .

AN ALTERNATIVE FLAME RETARDANT SOLUTION FOR CATEGORY CABLES CASE STUDY: MAXXAM™ FR POLYPROPYLENE Challe nge Accepted. MEETING FR GOALS IN DATA CABLES WITH AN ALTERNATIVE TO FEP Maxxam FR materials can provide cost savings and improved processing capabilities when used in category 5e cables and above. FEP provides such characteristics, and thus is commonly chosen to provide category cable insulation.

Avient Wire & Cable Industry Bulletin Overview of how Avient serves wire & cable customers, highlighting both power and data cables technologies Colorants and Additives for Wire & Cable

Solar Panels: Wire & Cable Jacketing, Backsheet Laminate Films Battery Connectors, Wire & Cable Jacketing, Battery Boxes Wire & Cable Jacketing, Wind Turbine Blades, Housings, Connectors

Additionally, ECCOH™ low smoke and fume non-halogen materials are well suited for fiber optics and communication cables; and Fiber-Line™ Swellcoat™ water blocking yarns enable cable designers to reduce cable footprint with higher fiber count cables for increased data transmission capabilities.

ECCOH™ XL Cross-Linkable Solutions for Photovoltaic Cables - Product Bulletin ECCOH XL 8148 for Photovoltaic Cable ECCOH XL 8148 solutions bring UV resistance and fast processing to photovoltaic cable

ECCOH™ XL Cross-Linkable Solutions for Photovoltaic Cables - Product Bulletin ECCOH XL 8148 for Photovoltaic Cable ECCOH XL 8148 solutions bring UV resistance and fast processing to photovoltaic cable