EPS 2.36 2.66 Adj. 16.0% Adj. 16.2% guidance Copyright © . 2025 17 ADJ. Specialty Engineered Materials END MARKETS REGIONS 17% 14%13% Defense Packaging Telecom 54% 33% US & Canada Europe, Middle East Energy Copyright © . 2025 22 Avient 2024 regional sales, by end market US & CANADA 41% of sales EMEA 35% of sales ASIA 18% of sales LATIN AMERICA 6% of sales 22% Packaging TelecomEnergyDefenseHealthcareBuilding & TransportationIndustrialConsumer 26% 16% 31% 26% 1%1% 2% 61% Copyright © . 2025 23 NON-HYDROCARBON MATERIALS HYDROCARBON-BASED ~35% of the raw material basket including part of “Other raw materials” are hydrocarbon-based Raw material basket 16% 4% 4% Performance additives Pigments TiO2 Dyestuffs Styrenic block copolymers Polypropylene Nylon Polyethylene Other raw materials Reconciliation of Non-GAAP Financial Measures (Unaudited) (Dollars in millions, except for per share data) Senior management uses comparisons of adjusted net income from continuing operations attributable to Avient shareholders and diluted adjusted earnings per share (EPS) from continuing operations attributable to Avient shareholders, excluding special items, to assess performance and facilitate comparability of results.

Modular construction: From projects to products (2019) • Avient internal data (November 2024) • Composites World, “Composite SIPs for more affordable, efficient and sustainable buildings,” October 21, 2024 • US Census Bureau, HUD, October 19, 2024 Next Page 14: Previous Page 15: Previous Page 27: Next Page 16: Previous Page 17: Next Page 17: Previous Page 18: Next Page 5: Previous Page 5: Next Page 18: Previous Page 19: Next Page 19: Previous Page 20: Next Page 20: Previous Page 21: Next Page 21: Previous Page 22: Next Page 22: Previous Page 23: Next Page 15: Previous Page 16: Next Page 23: Previous Page 24: Next Page 24: Previous Page 25: Next Page 25: Previous Page 26: Next Page 26: Next Page 27: Previous Page 28: Next Page 28:

GOFF Director Date: February 17, 2012 Gregory J. MOONEY Director Date: February 17, 2012 Edward J. WALTERS Director Date: February 17, 2012 Farah M.

Melle, Germany 17. Knowsley, United Kingdom 17. Minority 17% White 83% Age 30–50 17% Over 50 83% Global Gender Diversity by Level—Female Directors, General Managers, VP/SVP 19% Management 30% Professionals 38% Production Associates 6% All Avient Associates 21% * U.S.

PROXY STATEMENT 2025 | Annual Meeting of Shareholders 17 Kim Ann Mink, Ph.D. PROXY STATEMENT 2025 | Annual Meeting of Shareholders 63 Outstanding Equity Awards at 2024 Fiscal Year-End Option Awards Stock Awards Grant Date Unexercised  Options (#) Exercisable Number of Securities Underlying Unexercised Options (#) Unexercise- able (1) Equity Incentive Plan Awards: Number of Securities Underlying Unexercised Unearned Options (#) (1) Option Exercise Price Option Expiration Date Number of Shares or Units of Stock that have not Vested (2) Market Value of Shares or Units of Stock that have not Vested 12/1/2023 — — — — — 108,979 4,452,882 2/22/2024 — — — — — 42,175 1,723,271 2/22/2024 — 133,300 — 39.27 2/22/2034 — — 2/14/2022 — — — — — 6,849 279,850 2/17/2023 — — — — — 8,150 333,009 2/22/2024 — — — — — 10,136 414,157 2/08/2021 27,200 — — 42.27 2/08/2031 — — 2/14/2022 — — 22,300 52.64 2/14/2032 — — 2/17/2023 8,750 8,750 8,750 42.93 2/17/2033 — — 2/22/2024 — 32,050 — 39.27 2/22/2034 — — 2/14/2022 — — — — — 4,909 200,582 2/17/2023 — — — — — 7,204 294,355 2/22/2024 — — — — — 8,038 328,433 2/14/2018 10,400 — — 41.89 2/14/2028 — — 2/10/2020 19,200 — — 31.48 2/10/2030 — — 2/08/2021 20,150 — — 42.27 2/08/2031 — — 2/14/2022 — — 16,000 52.64 2/14/2032 — — 2/17/2023 7,750 7,750 7,750 42.93 2/17/2033 — — 2/22/2024 — 25,400 — 39.27 2/22/2034 — — A.M. Sanders 4/29/2024 — — — — — 20,343 831,215 2/14/2022 — — — — — 4,803 196,251 2/17/2023 — — — — — 5,731 234,169 2/22/2024 — — — — — 6,553 267,756 2/11/2019 16,700 — — 31.54 2/11/2029 — — 2/10/2020 18,550 — — 31.48 2/10/2030 — — 2/08/2021 19,250 — — 42.27 2/08/2031 — — 2/14/2022 — — 15,650 52.64 2/14/2032 — — 2/17/2023 6,133 6,133 6,134 42.93 2/17/2033 — — 2/22/2024 — 20,600 — 39.27 2/22/2034 — — M.A.

All litigation concerning this contract shall occur only in the state and national courts of Pune, India, and each party consents to exclusive jurisdiction in such courts. 17.

If the Buyer must provide Seller with its own or third parties' information, it must ensure that it has the corresponding legal basis or consents in order to fully comply with local data protection regulation. 17. Terms and Conditions (December 17, 2024) Vendedor en caso de que éste trate de obtener una orden de protección. Términos y Condiciones (17 de diciembre de 2024)

Buyer expressly warrants that employees, agents and subcontractors of Buyer shall not directly or indirectly (i) accept, promise, offer or provide any improper advantage to, or (ii) enter into an agreement (a) with any entity or person, including officials of a government or a government-controlled entity, or (b) relating to a product, which would constitute an offense or infringement of applicable Laws and Standards. 17. Terms and Conditions (December 17, 2024) 19. Términos y condiciones (17 de diciembre de 2024)

Van Hulle President, Global Color, Additives & Inks PolyOne Corporation Page 16 Building & 7% Electrical & 1% 14% 31% Textiles 7% 2014 Revenue by Industry Segment 2014 Revenues: $0.9 Billion At a Glance Global Color, Additives & Inks 44% Europe 36% Latin America PolyOne Corporation Page 17 A Case Study for Transformational Success 1.7% 4.6% 5.1% 5.5% 7.2% 8.1% 9.7% 12.2% 14.7% 2006 2007 2008 2009 2010 2011 2012 2013 2014 Operating Margin $9 $26 $28 $25 $43 $50 $75 $104 $125 2006 2007 2008 2009 2010 2011 2012 2013 2014 Operating Income ($M) •Cultural mindset shift from volume to value •Customer centric focus and training •Differentiation with innovation and service •Acquisitions expand portfolio of technology Global Color, Additives & Inks PolyOne Corporation Page 18 395 262 2006 2014 From Volume… (lbs in millions) -34% $94 $293 2006 2014 To Value Gross Margin ($ in millions) +210% Global Color, Additives & Inks PolyOne Corporation Page 19 Accelerating Growth Global Color, Additives & Inks Innovation Market Growth/ Megatrends Geographic Expansion Collaboration PolyOne Corporation Page 20 Who We Are Growing With Global Color, Additives & Inks PolyOne Corporation Page 21 Innovation Pipeline Potential Global Color, Additives & Inks Addressable Market ($ millions) $300 $500 $400 Prototype Frame Opportunity Scale-up & Test Market Build Business Case Commercial Launch Phase 1 Phase 2 Phase 3 Phase 4 Phase 5 3 3 5 0 1 8 3 1 1 5 1 1 1 1 0 Breakthrough Platform Derivative PolyOne Corporation Page 22 Megatrends Aligned with Key End Markets Increasing Energy Efficiency Protecting the Environment Improving Health and Wellness Megatrend End Markets Globalizing and Localizing Health & Wellness Transportation Packaging Consumer Global Color, Additives & Inks PolyOne Corporation Page 23 $150M Revenue Potential $500M Revenue Potential Additive Technologies InVisiOSM Color & Design Services Key Initiatives Global Color, Additives & Inks PolyOne Corporation Page 24 Innovation Market Growth / Megatrends Geographic Expansion Collaboration Platinum Vision 1.7% 7.2% 14.7% 20%+ 2006 2010 2014 2020 Platinum Vision World Class Operating Margin Accelerating Growth Global Color, Additives & Inks PolyOne Corporation Page 25 Summary • Global Capabilities • Innovation Leader • Collaboration – One PolyOne Global Color, Additives & Inks Color Matters PolyOne Corporation Page 26 Global Specialty Engineered Materials Craig M. S&P 500 -100% 200% 300% 400% 500% 600% POL S&P 500 PolyOne Corporation Page 85 Formula for Success Innovation Market Beating Performance Excellence in Execution PolyOne Corporation Page 86 Track Record of Successful Acquisitions $12 $50 2007 2014 $22 $39 2012 2014 $24 $69 2012 2014 GLS ColorMatrix Spartech OI in $ millions PolyOne Corporation Page 87 Driving Toward Premier Profitability EBIT Margins for top tier companies Victrex 41% 18% Albemarle Eastman 17% Hexcel 17% FMC 16% Ecolab 14% 12% Specialty EBIT Margin – 2014 IFF 19% Celanese 13% PolyOne Corporation Page 88 2006 2014 2020 “Where we were” “Where we are” Platinum Vision Operating Income % Specialty: Global Color, Additives & Inks 1.7% 14.7% 20%+ Global Specialty Engineered Materials 1.1% 12.1% 20%+ Designed Structures & Solutions 1.4%(2012) 7.3% 12 – 14% Performance Products & Solutions 5.5% 7.7% 10 – 12% Distribution 2.6% 6.1% 6.5 – 7.5% Specialty Platform % of Operating Income 6.0% 65% 80%+ ROIC 5.0% 11.3% 15% Adjusted EPS Growth N/A 37% Double Digit Expansion 2020 Platinum Vision PolyOne Corporation Page 89 Platinum Vision: Pathway to Accelerated Growth Organic Sales Growth Margin Expansion Share Repurchases Acquisitions PolyOne Corporation Page 90 2006 2010 2014 2020 Driving Toward a Premium Specialty Multiple 6x 4x Commodity POL 8x Hybrid 10x 14x+ Mid-Tier Specialty Premium Specialty M ul tip le POL POL POL PolyOne Corporation Page 91 The New PolyOne: A Specialty Growth Company Why Invest In PolyOne?

Investor Day POLYONE I N V E S T O R P R E S E N T A T I O N A U G U S T 2 0 1 9 FORWARD LOOKING STATEMENTS PolyOne Corporation 2 USE OF NON-GAAP MEASURES PolyOne Corporation 3 V I S I O N PolyOne Corporation 4 To be the world’s premier provider of specialized polymer materials, services and solutions C O R E V A L U E S P E R S O N A L V A L U E S Honesty IntegrityRespect Operational Excellence Commercial Excellence Specialization Globalization Collaboration ExcellenceInnovation To be the world’s premier provider of specialized polymer materials, services and solutions S A F E T Y F I R S T PolyOne Corporation 5 Injuries per 100 Workers Spartech Acquisition 1.3 1.1 1.1 0.85 0.65 0.57 0.54 0.97 0.84 0.74 0.74 0.69 0.51 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 PolyOne Corporation 6 P O L Y O N E 2 0 1 8 R E V E N U E | $ 3 . 5 B I L L I O N United States 57% 16% Latin America Canada Distribution Performance Products & Solutions 19% Specialty Engineered Color Additives & Inks 29% Segment End Market Geography Building & Construction Electrical & Electronics 13% 2009 2010 2011 2012 2013 2014 2015 2016* 2017* 2018 $2.43 P R O O F O F P E R F O R M A N C E C O N S E C U T I V E Y E A R S PolyOne Corporation 7 9 $0.13 $0.68 $0.82 $1.00 $1.31 $1.80 $1.96 $2.06 $2.21 ROIC** 5.0% 14.1% Operating Income % of Sales Color, Additives & Inks 1.7% 15.1% Specialty Engineered Materials 1.1% 11.2% Performance Products & Solutions 4.3% 10.0% Distribution 2.6% 5.6% A D J U S T E D E P S E X P A N S I O N S U S T A I N A B L E P A T H T O D O U B L E - D I G I T E P S G R O W T H PolyOne Corporation 8 P E O P L E P R O D U C T S P L A N E T P E R F O R M A N C E Double digit annual EPS growth strategic acquisitions Innovate 600K-1M commercial resources 5-7% Double acquired Lean Six Sigma commercial excellence 531 710 130 164 504 663 R&D / Technical Marketing Sales PolyOne Corporation 9 Increased commercial headcount + 34% + 26% + 32% I N V E S T M E N T I N COMMERCIAL RESOURCES D R I V I N G G R O W T H Sustained revenue increases led by organic business $2.9 $2.9 $3.2 $3.5 2015 2016 2017 2018 Total + 9% Organic + 5% Revenue in billions of $ Total + 10% Organic + 7% Lead Specialists T H E E V O L V I N G C U S T O M E R R E L A T I O N S H I P PolyOne Corporation 10 Expanded Path Traditional Path Strategic Accounts/ Field Sales Business Development Customer Service Web and Social Media Inside Sales PolyOne Corporation 11 Investments in digital and dedicated inside sales to improve customer experience 110% increase in leads (from 6,000 to 12,700) driven by website, phone, and online chat EXPANDED PATH A DDI N G C U S T O M E R T O U C H P O I N T S 24 Inside sellers $11M $109M Inside sales/digital revenue A L I G N I N G W I T H T R E N D S F O R G R O W T H T R A N S P O R T A T I O N P A C K A G I N G H E A L T H C A R E C O N S U M E R PolyOne Corporation 12 Facilitate alternative energy solutions Light- weighting Reduce packaging materials Improve recyclability Reduce spread of infection I N N O V A T I O N PolyOne Corporation 13 Customization 55% M&A 30% Innovation Pipeline Innovation comes from Research & Development Spend Vitality Index $20 $56 Transformational Adjacent Core 3 H O R I Z O N S O F D E V E L O P M E N T PolyOne Corporation 14 Market Technical I N N O V A T I O N I N N O V A T I O N P I P E L I N E PolyOne Corporation 15 PrototypeFrame Opportunity Scale-up & Test Market Build Business Case Commercial Launch (since 2017) Phase 1 Phase 2 Phase 3 Phase 4 Phase 5 6 11 3 2 28 0 10 7 2 Breakthrough Platform Derivative F L A M E R E T A R D A N T P O L Y M E R S A D V A N C E D C O M P O S I T E S B A R R I E R M A T E R I A L S C O L O R A N T T E C H N O L O G I E S T H E R M O P L A S T I C E L A S T O M E R S I N N O V A T I O N S P O T L I G H T : C O M P O S I T E S PolyOne Corporation 16 C O M P O S I T E S R E F R E S H E R PolyOne Corporation 17 Fiber Polymer Composite S T R A T E G I C I N V E S T M E N T H I S T O R Y Thermoplastic Composites Long Fiber Reinforced Thermoplastics Continuous Fiber Thermosets Long Fiber Reinforced Thermoplastics Continuous Fiber Thermosets 2012 2015 20162009 2011 2018 PolyOne Corporation 2019 18 C O M P O S I T E S I N T R A N S P O R T A T I O N PolyOne Corporation 19 W A T E R C R A F TR A I L H E A V Y T R U C K F I B E R - L I N E H I G H L I G H T S PolyOne Corporation 20 $100M Customer Value Fiber-Line Fiber Processing Capabilities Polymer Formulation Capabilities P O L Y O N E A P P L I C A T I O N S I N F I B E R O P T I C C A B L E S PolyOne Corporation 21 F I B E R O P T I C A L G R O W T H D R I V E R S PolyOne Corporation 22 5G Networks 10x 8x 5G vs. 4G PolyOne Corporation 23 Safety Technology Geography Service FinancialPeople 8-10% with ability to double I N V E S T - T O - G R O W M & A S T R A T E G Y PolyOne Corporation 24 Capture sourcing synergies Cross-sell & blend technology 8-10% operating I N V E S T - T O - G R O W M & A P L A Y B O O K Protect customers Retain employees Implement LSS to drive efficiency improvements Innovate with combined portfolio Safety First! Leverage PolyOne’s global reach Phase 1 Phase 2 Phase 3 18-20% operating Invest in commercial resources I N V E S T - T O - G R O W P R O O F O F P E R F O R M A N C E PolyOne Corporation 25 Commercial Resources Operating Income ($ in millions) Operating Margins 243 340 $36 $96 20% Established Acquisitions (> 7 years) + 40% + 165% + 900 bps I N V E S T - T O - G R O W D R I V I N G T H E F U T U R E PolyOne Corporation 26 Commercial Resources Operating Income ($ in millions) Operating Margins 138 181 251 $23 $25 $70 7% 8% 18-20% Recent Acquisitions PolyOne Corporation 27 Average Company Size # of Possibilities Rationale $200M S T R O N G P I P E L I N E D R I V E N B Y F R A G M E N T E D M A R K E T $0 $150 $300 $450 $600 $750 $900 2011 2012 2013 2014 2015 2016 2017 2018 $890M R E T U R N I N G C A S H T O S H A R E H O L D E R S O V E R $ 1 . 2 B I L L I O N S I N C E 2 0 1 1 PolyOne Corporation $0.16 $0.20 $0.24 $0.32 $0.40 $0.48 $0.54 $0.70 $0.78 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 3-Year Dividend Plan Cumulative Share Repurchases Increasing Annual Dividend 28 6.3% 14.1% 16-17% 2009 2018 Updated Expectations R O I C D R I V E S S H A R E H O L D E R R E T U R N PolyOne Corporation 29 PolyOne Corporation 30 W H Y I N V E S T I N P O L Y O N E ?