Ahrensburg, Germany 66. Total Waste to Landfill � ����� ����� ����� ������ 2016 2017 2018 2019* 2020* 2019* 2020* 2030 Goal M e tr ic T o n s 17% DECREASE FROM 2019 Waste to Landfill HOME | Contents | Message from the CEO | Who We Are | People | Products | Planet | Performance | Metrics | Index Sustainability Report | 2020 66 Eliminating Plastic Waste Plastic is a miraculous, versatile material that positively impacts our world. Global Compact Engaging with Our Stakeholders Historic Transformation, Inspired Future Better Together: PolyOne and Clariant Masterbatch Who We Are What We Do: Material Science Revenue by Geography and End Market Where We Are: Global Locations Communities Counting on Avient Message from Avient’s VP of Sustainability Management Approach: EH&S Safety First COVID-19 Protecting Our People as an Essential Business Occupational Safety & Health Continuous Improvement Performance: Metrics and Monitoring Security Management Approach: Training and Development Manager Training and Front-Line Engagement Avient Competencies Diversity & Inclusion: Leading Change from the Top Management Approach: Diversity & Inclusion Workforce Demographics Human Rights Associate Benefits Awards & Recognition Programs Health and Wellness Career Training and Performance Feedback Virtual Learning Operational and Commercial Excellence Training Leadership Development Programs Talent Acquisition and Campus Recruiting A Great Place to Work How Our Products Enable Sustainability Innovation: The Lifeblood of a Specialty Organization No Surprises Pledge Our Solutions…In Action Management Approach: Product Stewardship Global Chemical Management Product Excellence Management Approach: Supplier Collaboration Supplier Evaluation Strategic Partnerships and Alliances Protecting Our Planet Climate Change Energy and Greenhouse Gas (GHG) Emissions Eliminating Plastic Waste Clean-Up and Remediation World Clean Up Day Community Service Community Engagement Performance Overview Sustainable Solutions Performance The Highest Ethical Standards Ethics Hotline and Reporting Enterprise Risk Management (ERM) Board of Directors Governance Board of Directors Policies & Guidelines People and Planet Data and Metrics Index Reconciliation of Non-GAAP Financial Measures forward arrow FC: Back Arrow Button 2: Page 2: Page 3: Page 4: Page 5: Page 6: Page 7: Page 8: Page 9: Page 10: Page 11: Page 12: Page 13: Page 14: Page 15: Page 16: Page 17: Page 18: Page 19: Page 20: Page 21: Page 22: Page 23: Page 24: Page 25: Page 26: Page 27: Page 28: Page 29: Page 30: Page 31: Page 32: Page 33: Page 34: Page 35: Page 36: Page 37: Page 38: Page 39: Page 40: Page 41: Page 42: Page 43: Page 44: Page 45: Page 46: Page 47: Page 48: Page 49: Page 50: Page 51: Page 52: Page 53: Page 54: Page 55: Page 56: Page 57: Page 58: Page 59: Page 60: Page 61: Page 62: Page 63: Page 64: Page 65: Page 66: Page 67: Page 68: Page 69: Page 70: Page 71: Page 72: Page 73: Page 74: Page 75: Page 76: Page 77: Page 78: Page 79: Page 80: Page 81: Page 82: Page 83: Page 84: Page 85: Page 86: Page 87: Page 88: Page 89: Page 90: Page 91: Page 92: Page 93: Page 94: Page 95: Page 96: Page 97: Page 98: Page 99: Page 100: Page 101: forward arrow button 2: Page 2: Page 3: Page 4: Page 5: Page 6: Page 7: Page 8: Page 9: Page 10: Page 11: Page 12: Page 13: Page 14: Page 15: Page 16: Page 17: Page 18: Page 19: Page 20: Page 21: Page 22: Page 23: Page 24: Page 25: Page 26: Page 27: Page 28: Page 29: Page 30: Page 31: Page 32: Page 33: Page 34: Page 35: Page 36: Page 37: Page 38: Page 39: Page 40: Page 41: Page 42: Page 43: Page 44: Page 45: Page 46: Page 47: Page 48: Page 49: Page 50: Page 51: Page 52: Page 53: Page 54: Page 55: Page 56: Page 57: Page 58: Page 59: Page 60: Page 61: Page 62: Page 63: Page 64: Page 65: Page 66: Page 67: Page 68: Page 69: Page 70: Page 71: Page 72: Page 73: Page 74: Page 75: Page 76: Page 77: Page 78: Page 79: Page 80: Page 81: Page 82: Page 83: Page 84: Page 85: Page 86: Page 87: Page 88: Page 89: Page 90: Page 91: Page 92: Page 93: Page 94: Page 95: Page 96: Page 97: Page 98: Page 99: Page 100: Page 101: Back Arrow Button 8: Back Arrow Button 7: forward arrow button 3: Back Arrow Button 6: Back Arrow Button 5: Back Arrow Button 4: Back Arrow Button 3:

Flow Length, inches (cm) Series Injection Velocity, 3 in/s (8 cm/s) Injection velocity, 5 in/s (13 cm/s) DynaflexTM D 13-15 (33-38) 18-20 (46-51) DynaflexTM G 12-22 (30-56) 18-30 (46-70) VersaflexTM 9-16 (23-41) 13-26 (33-66) VersalloyTM 18-20 (46-51) 30-32 (76-81) VersollanTM 12-17 (30-43) 19-22 (48-56) *Spiral flow tests performed using a 0.0625" (1.6mm) thick, 0.375" (9.5mm) wide channel at 400˚F (204˚C). Flow Length, inches (cm) Series Injection Velocity, 3 in/s (8 cm/s) Injection velocity, 5 in/s (13 cm/s) DynaflexTM D 13-15 (33-38) 18-20 (46-51) DynaflexTM G 12-22 (30-56) 18-30 (46-70) VersaflexTM 9-16 (23-41) 13-26 (33-66) VersalloyTM 18-20 (46-51) 30-32 (76-81) VersollanTM 12-17 (30-43) 19-22 (48-56) *Spiral flow tests performed using a 0.0625" (1.6mm) thick, 0.375" (9.5mm) wide channel at 400˚F (204˚C).

Jellison 66 2015 Yes C M Ashish K. Khandpur, Ph.D. 56 2023 No Sandra Beach Lin 66 2013 Yes M M Kim Ann Mink, Ph.D. 64 2017 Yes M M Ernest Nicolas 46 2021 Yes M M Kerry J. Director since: 2015 Age: 66 Current Public Company Directorships: • None Current Non-Public Company Directorships: • Young Innovations, Inc.

A majority of employees have full-time contracts. 102–9 Supply chain Avient 2024 Annual Report—Form 10-K Pages 2–4 What We Do 102–10 Significant changes to the organization and its supply chain Avient 2024 Annual Report—Form 10-K Pages 8–10 What We Do Supplier Collaboration 102–11 Precautionary Principle or approach Avient 2024 Annual Report—Form 10-K Pages 8–13 102–12 External initiatives Who We Are Engaging with Our Stakeholders Security Becoming an Even Better Place to Work Strategic Partnerships and Alliances 102–13 Membership of associations Strategic Partnerships and Alliances Strategy 102–14 Statement from senior decision-maker Message from the CEO 102–15 Key impacts, risks, and opportunities Avient 2024 Annual Report—Form 10-K Pages 8–13 Amplifying Innovation for a Sustainable World Sustainability Report | 2024 53Contents | About Avient | Message from the CEO | Sustainability at Avient | Enabling a Sustainable World | Preserving the Planet | Culture of Safety & Sustainability | Governance | Appendix https://www.avient.com/products https://www.avient.com/sites/default/files/2025-03/380605_AVIENT_2024AR_full_250325.pdf https://www.avient.com/sites/default/files/2025-03/380605_AVIENT_2024AR_full_250325.pdf https://www.avient.com/sites/default/files/2025-03/380605_AVIENT_2024AR_full_250325.pdf https://www.avient.com/sites/default/files/2025-03/380605_AVIENT_2024AR_full_250325.pdf https://www.avient.com/sites/default/files/2025-03/380605_AVIENT_2024AR_full_250325.pdf https://www.avient.com/sites/default/files/2025-03/380605_AVIENT_2024AR_full_250325.pdf https://www.avient.com/sites/default/files/2025-03/380605_AVIENT_2024AR_full_250325.pdf https://www.avient.com/sites/default/files/2025-03/380605_AVIENT_2024AR_full_250325.pdf https://www.avient.com/sites/default/files/2025-03/380605_AVIENT_2024AR_full_250325.pdf https://www.avient.com/sites/default/files/2025-03/380605_AVIENT_2024AR_full_250325.pdf GRI Standard Disclosure Title 2024 Report Disclosures General Disclosures Ethics & Integrity 102–16 Values, principles, standards, and norms of behavior Who We Are Our Purpose and Strategic Framework 102–17 Mechanisms for advice and concerns about ethics Ethics Hotline and Reporting Governance 102–18 Governance structure Corporate Board Governance Environmental Health & Safety Avient 2024 Annual Report—Form 10-K Pages 14–15 & 68 Avient 2025 Proxy Statement—Pages 8–22 https://www.avient.com/investors/governance 102–20 Executive-level responsibility for economic, environmental, and social topics Corporate Board Governance Environmental Health & Safety Training & Development Inclusion & Impact Product Stewardship Supplier Collaboration https://www.avient.com/investors/governance 102–22 Composition of the highest governance body and its committees Avient 2024 Annual Report—Form 10-K Pages 14–15 & 64, 68 Corporate Board Governance Avient Board of Directors 102–23 Chair of the highest governance body Avient 2025 Proxy Statement—Page 16 102–24 Nominating and selecting the highest governance body Corporate Board Governance Avient 2024 Annual Report—Form 10-K Pages 14–15 Avient 2025 Proxy Statement—Page 16 https://www.avient.com/investors/governance 102–25 Conflicts of interest Corporate Board Governance Avient Code of Conduct https://www.avient.com/investors/governance 102–26 Role of highest governance body in setting purpose, values, and strategy Corporate Board Governance Avient 2024 Annual Report—Form 10-K Pages 14–15, 64 & 68 Avient 2025 Proxy Statement —Pages 28–31 https://www.avient.com/investors/governance 102–27 Collective knowledge of highest governance body Corporate Board Governance Avient 2025 Proxy Statement—Pages 8–9 102–28 Evaluating the highest governance body's performance Corporate Board Governance Avient 2025 Proxy Statement—Pages 32–36 https://www.avient.com/investors/governance Sustainability Report | 2024 54Contents | About Avient | Message from the CEO | Sustainability at Avient | Enabling a Sustainable World | Preserving the Planet | Culture of Safety & Sustainability | Governance | Appendix https://www.avient.com/sites/default/files/2025-03/380605_AVIENT_2024AR_full_250325.pdf https://www.avient.com/sites/default/files/2024-03/2024%20Proxy%20Statement%20%28Filed%29.pdf https://www.avient.com/investors/governance https://www.avient.com/investors/governance https://www.avient.com/sites/default/files/2025-03/380605_AVIENT_2024AR_full_250325.pdf https://www.avient.com/investors/governance/board-directors https://www.avient.com/sites/default/files/2024-03/2024%20Proxy%20Statement%20%28Filed%29.pdf https://www.avient.com/sites/default/files/2025-03/380605_AVIENT_2024AR_full_250325.pdf https://www.avient.com/sites/default/files/2024-03/2024%20Proxy%20Statement%20%28Filed%29.pdf https://www.avient.com/investors/governance https://www.avient.com/company/policies-and-governance/code-conduct https://www.avient.com/investors/governance https://www.avient.com/sites/default/files/2025-03/380605_AVIENT_2024AR_full_250325.pdf https://www.avient.com/sites/default/files/2024-03/2024%20Proxy%20Statement%20%28Filed%29.pdf https://www.avient.com/investors/governance https://www.avient.com/sites/default/files/2024-03/2024%20Proxy%20Statement%20%28Filed%29.pdf https://www.avient.com/sites/default/files/2024-03/2024%20Proxy%20Statement%20%28Filed%29.pdf https://www.avient.com/investors/governance GRI Standard Disclosure Title 2024 Report Disclosures General Disclosures Governance 102–29 Identifying and managing economic, environmental, and social impacts Corporate Board Governance Environmental Health & Safety https://www.avient.com/investors/governance 102–30 Effectiveness of risk management processes Corporate Board Governance Avient 2025 Proxy Statement —Pages 29–30 https://www.avient.com/investors/governance 102–31 Review of economic, environmental, and social topics Corporate Board Governance Avient 2025 Proxy Statement—Pages 29–30 https://www.avient.com/investors/governance 102–32 Highest governance body's role in sustainability reporting Corporate Board Governance Avient 2025 Proxy Statement —Pages 29–30 https://www.avient.com/investors/governance 102–33 Communicating critical concerns Corporate Board Governance Avient 2025 Proxy Statement —Page 29–30 & 32 Avient Code of Conduct https://www.avient.com/investors/governance 102–34 Nature and total number of critical concerns Avient 2024 Annual Report—Form 10-K Pages 54–55 102–35 Remuneration Policies Avient 2025 Proxy Statement—Pages 47–66 102–36 Process for determining remuneration Avient 2025 Proxy Statement—Pages 43–46 102–37 Stakeholders' involvement in remuneration Avient 2025 Proxy Statement—Pages 43–47 102–38 Annual total compensation ratio Avient 2025 Proxy Statement—Pages 71–72 Stakeholder Engagement 102–40 List of stakeholder groups Engaging with Our Stakeholders 102–41 Collective bargaining agreements Workforce Demographics 102–42 Identifying and selecting stakeholders Engaging with Our Stakeholders 102–43 Approach to stakeholder engagement Engaging with Our Stakeholders 102–44 Key topics and concerns raised Engaging with Our Stakeholders Reporting Practice 102–45 Entities included in the consolidated financial statements Avient 2024 Annual Report—Form 10-K Pages 2–3 We operate in two reportable segments: (1) Color, Additives and Inks and (2) Specialty Engineered Materials. 102–46 Defining report content and topic boundaries The information in this report applies to Avient and all owned facilities, joint ventures, and operating companies globally within the reporting period, unless otherwise stated. Global Compact Engaging with Our Stakeholders 2030 Sustainability Goals & Progress Sustainability Performance & Recognition Enabling a Sustainable World Amplifying Innovation for a Sustainable World Our Sustainability Portfolio Enabling Sustainability for Our Customers Product Stewardship Product Excellence Global Chemical Management Supplier Collaboration Supplier Evaluation Strategic Partnerships and Alliances Protecting the Environment Preserving the Planet Climate Change Reducing Emissions Across Our Value Chain Climate Risks & Opportunities Waste: Preventing, Minimizing, Eliminating Water Stewardship Biodiversity Conventional Air Emissions Culture of Safety & Sustainability Environmental, Health & Safety Performance: Metrics & Monitoring Occupational Safety & Health Security Training & Development Employee Resource Groups Inclusion & Impact Benefits Programs Human Rights Becoming an Even Better Place to Work Community Service and Charitable Contributions Governance Governance The Highest Ethical Standards Compliance and Training Programs Ethics Hotline and Reporting Policies & Guidelines Appendix People Data and Metrics Planet Data and Metrics Workforce Demographics Earth Day Photo Contest GRI Standards Content Index Reconciliation of Non-GAAP Financial Measures (Unaudited) forward arrow button 33: forward arrow button 23: Page 2: Back Arrow Button 28: Page 2: forward arrow button 25: Page 3: Page 5: Page 6: Page 7: Page 8: Back Arrow Button 30: Page 3: Page 5: Page 6: Page 7: Page 8: forward arrow button 24: Page 4: Back Arrow Button 29: Page 4: forward arrow button 26: Page 9: Page 10: Page 11: Page 12: Page 13: Page 14: Back Arrow Button 31: Page 9: Page 10: Page 11: Page 12: Page 13: Page 14: Button 2: forward arrow button 27: Page 15: Page 16: Page 17: Page 18: Page 19: Page 20: Page 21: Page 22: Page 23: Page 24: Page 25: Back Arrow Button 32: Page 15: Page 16: Page 17: Page 18: Page 19: Page 20: Page 21: Page 22: Page 23: Page 24: Page 25: forward arrow button 28: Page 26: Page 27: Page 28: Page 29: Page 30: Page 31: Back Arrow Button 33: Page 26: Page 27: Page 28: Page 29: Page 30: Page 31: forward arrow button 30: Page 32: Page 33: Page 34: Page 35: Page 36: Page 37: Page 38: Page 39: Page 40: Page 41: Back Arrow Button 34: Page 32: Page 33: Page 34: Page 35: Page 36: Page 37: Page 38: Page 39: Page 40: Page 41: Button 1: forward arrow button 31: Page 42: Page 43: Page 44: Page 45: Back Arrow Button 35: Page 42: Page 43: Page 44: Page 45: forward arrow button 32: Page 46: Page 47: Page 48: Page 49: Page 50: Page 51: Page 52: Page 53: Page 54: Page 55: Page 56: Page 57: Page 58: Page 59: Page 60: Page 61: Page 62: Page 63: Page 64: Page 65: Page 66: Page 67: Back Arrow Button 36: Page 46: Page 47: Page 48: Page 49: Page 50: Page 51: Page 52: Page 53: Page 54: Page 55: Page 56: Page 57: Page 58: Page 59: Page 60: Page 61: Page 62: Page 63: Page 64: Page 65: Page 66: Page 67: Back Arrow Button 37:

We launched over 30 new sustainability enabling solutions in 2023, driven by our Phased Offering Launch & New Product Development processes, proprietary means through which we take new solution ideas from concept to commercialization. 57 (3.6.1.9) Primary financial effect of the opportunity Select from: ☑ Increased revenues through access to new and emerging markets (3.6.1.10) Time horizon over which the opportunity is anticipated to have a substantive effect on the organization Select all that apply ☑ Short-term (3.6.1.11) Likelihood of the opportunity having an effect within the anticipated time horizon Select from: ☑ Likely (66–100%) (3.6.1.12) Magnitude Select from: ☑ Medium-high (3.6.1.14) Anticipated effect of the opportunity on the financial position, financial performance and cash flows of the organization in the selected future time horizons Our specialty transformation has enabled the highest margins in the company’s history. For example, the Edgetek PKE series consists of specialty engineered polyketone (PK) 59 thermoplastics designed to offer manufacturers a high-performing, cost-competitive, and eco-conscious alternative to traditional nylons (PA66 and PA6). 5.9.1) Water-related CAPEX (+/- % change) 1405 (5.9.2) Anticipated forward trend for CAPEX (+/- % change) 126 -66 (5.9.3) Water-related OPEX (+/- % change) 0 (5.9.4) Anticipated forward trend for OPEX (+/- % change) 0 (5.9.5) Please explain We only have data pertinent to CAPEX [Fixed row] (5.10) Does your organization use an internal price on environmental externalities?

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Dengan sopan, minta mereka menunjukkan lencana atau kartu pas pengunjung Avient.

Als ze geen badge of pas hebben, volg dan onmiddellijk uw lokale beveiligingsprocedures. 11 Inhoudsopgave Eerlijkheid op het werk Onze reputatie voor eerlijkheid heeft een belangrijke waarde voor onze klanten, leveranciers, aandeelhouders en andere belanghebbenden, voor elk van ons persoonlijk en voor Avient.

2025 Proxy Statement Table of Contents Page Letter to Shareholders i Notice of 2025 Annual Meeting of Shareholders ii Record Date ii Voting Matters and Vote Recommendations ii Proxy Statement 1 Proxy Summary 1 Voting and Meeting Information 1 Attendance and Participation 1 Who is Eligible to Vote 2 Advance Voting Methods 2 Voting During the Annual Meeting 3 Questions 3 Our Purpose and Strategic Framework 4 People 4 Products 5 Planet 5 Performance 6 Our Director Nominees and Committee Membership 6 Summary of Director Nominee Skills, Experience and Background 7 Governance Highlights 8 PROPOSAL 1—Election of Twelve Director Nominees to Our Board of Directors 10 PROPOSAL 2—Approval, on an Advisory Basis, of Named Executive Officer Compensation 23 PROPOSAL 3—Ratification of the Appointment of Ernst & Young LLP ("EY") as Our Independent Registered Public Accountant 25 Independent Registered Public Accountant Services and Related Fee Arrangements 25 Report of the Audit Committee 26 Corporate Governance 28 Director Independence 28 Board Leadership Structure 29 Majority Voting for Directors 29 Board Oversight of Risk 29 Board Oversight of ESG and Sustainability Matters 30 Code of Ethics, Code of Conduct and Corporate Governance Guidelines 31 Related Person Transactions 31 Communication with the Board 32 Board and Committees 32 Board Refreshment 37 Board Tenure 37 2024 Non-Employee Director Compensation 38 Non-Employee Director Compensation Highlights 38 Non-Employee Director Retainer and Meeting Fees 38 2024 Non-Employee Director Compensation Table 39 Fully Vested Deferred Shares 40 Ownership of Avient Shares 41 Beneficial Ownership of Our Common Shares 41 Stock Ownership Guidelines for Non-Employee Directors 42 Compensation Discussion and Analysis 43 Executive Summary 43 Executive Compensation Philosophy and Objectives 45 What We Pay and Why: Elements of Compensation 47 Other Aspects of Our Compensation Programs 54 Executive Compensation 59 2024 Summary Compensation Table 59 2024 Grants of Plan-Based Awards 62 Outstanding Equity Awards at 2024 Fiscal Year-End 64 2024 Option Exercises and Stock Vested 65 2024 Non Qualified Deferred Compensation 65 Potential Payments Upon Termination or Change of Control 66 CEO Pay Ratio Disclosure 71 Pay Versus Performance Disclosure 72 Compensation Committee Interlocks and Insider Participation 76 Risk Assessment of the Compensation Programs 76 Compensation Committee Report 76 Miscellaneous Provisions 77 Appendix A 80 In this proxy statement, statements that are not reported financial results or other historical information are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. We do have management continuity agreements EXECUTIVE COMPENSATION PROXY STATEMENT 2025 | Annual Meeting of Shareholders 66 (“Continuity Agreements”) with each of our continuing Named Executive Officers that provide for specified benefits upon a termination of employment following a change of control, and each of our continuing Named Executive Officers participates in our Executive Severance Plan.

Patterson Chairman, President and CEO 0% 20% 40% 60% 80% 100% 2005 2010 2015 2021 2022PF(2) % o f A d ju st e d E B IT D A (1 ) (1) Adjusted EBITDA is EBITDA excluding corporate costs and special items (2) Pro forma for the acquisition of Dyneema and divestiture of Distribution Specialty Transformation Commodity JVs Performance Products & Solutions Distribution Specialty Businesses 7% 46% 66% 86% 100% End Market Transformation(1) � �� �� �� �� �� �� 2006 2022PF(2) 2006 2022PF(2) (1) End market revenue as a percent of total (2) Pro forma for the acquisition of Dyneema and divestiture of Distribution Transportation Building & Construction Healthcare Packaging Consumer 57% 19% 58% 22% 14% 43% 9% 10% 8% 10% 4% 24% 20% 8% Defense 6% United States Securities and Exchange Commission Washington, DC 20549 FORM 10-K ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Cota, Colombia 66. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may 65 AVIENT CORPORATION become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate. 66 AVIENT CORPORATION ITEM 9B.