Goff 66 2011 Yes M C Neil Green 53 2021 Yes M M William R. Skills/Experience Ab er na th y Fe ar on Go ff Gr ee Je lli so Li M in k Ni co la s Pa tt er so Pr ee te Ve rd ui W ul fs oh Financial Knowledge of finance or financial reporting; experience with debt/capital market transactions and/or mergers and acquisitions l l l l l l l l l International Experience doing business internationally or focused on international issues and operations and exposure to markets, economies, and cultures outside the U.S. Director since: 2011 Age: 66 • Exxon Mobil Corporation • Enbridge Inc. • Marathon • MPLX GP, TLGP • Andeavor • DCP Midstream GP, LLC • QEP Midstream Partners, LP • Western Logistics GP LLC Neil Green Executive Vice President and Chief Digital Officer at Otis Worldwide Corporation (“Otis”), a leading elevator and escalator manufacturing, installation and service company, since 2020.

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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 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 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.

Tianjin, China 66. Management has assessed the effectiveness of Avient’s internal control over financial reporting as of December 31, 2021 and has prepared Management’s Annual Report On Internal Control Over Financial Reporting contained on page 66 of this Annual Report, which concludes that as of December 31, 2021, Avient’s internal control over financial reporting was effective and that no material weaknesses were identified. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may 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.

Chairman, President and CEO 0% 20% 40% 60% 80% 100% 2005 2010 2015 2021 2022PF(2) % o f d ju st e d E B IT D (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.

Aland, Finland 66. LLC, as joint-lead arrangers and joint-book managers, Jefferies Finance LLC, KeyBanc Capital Markets Inc. and SunTrust Robinson Humphrey, Inc., as co-managers, and several other commercial lending institutions that are parties thereto (incorporated by reference to Exhibit 10.6 to the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2015, SEC File No. 1-16091) 66 AVIENT CORPORATION 10.5 Amendment Agreement No. 1 to the Credit Agreement, dated as of June 15, 2016, among the Company, certain subsidiaries of the Company, Citibank, N.A., as administrative agent, and the additional lender party thereto (incorporated by reference to Exhibit 10.2 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30. 2016, SEC File No. 16091) 10.6 Amendment Agreement No. 2, dated August 3, 2016, by and among PolyOne Corporation, the subsidiaries of PolyOne Corporation party thereto, Citibank, N.A, as administrative agent, and the lenders party thereto (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed on August 5, 2016, SEC File No. 10.7 Amendment Agreement No. 3, dated January 24, 2017, by and among PolyOne Corporation, the subsidiaries of PolyOne Corporation party thereto, Citibank, N.A., as administrative agent, and the lenders party thereto (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2017, SEC File No. 1-16091) 10.8 Amendment Agreement No. 4, dated August 15, 2017, by and among PolyOne Corporation, the subsidiaries of PolyOne Corporation party thereto, Citibank, N.A., as administrative agent, and the lenders party thereto (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2017, SEC File No. 1-16091) 10.9 Amendment Agreement No. 5, dated April 11, 2018, by and among PolyOne Corporation, the subsidiaries of PolyOne Corporation party thereto, Citibank, N.A., as administrative agent, and the lenders party thereto (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2018, SEC File No. 1-16091) 10.10 Amendment Agreement No. 6, dated November 9, 2018, by and among PolyOne Corporation, the subsidiaries of PolyOne Corporation party thereto, Citibank, N.A, as administrative agent, and the lenders party thereto (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed on November 13, 2018, SEC File No. 10.11 Amendment Agreement No. 7, dated as of August 29, 2022, by and among Avient Corporation, the lenders party thereto and Citibank, N.A., as administrative agent (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K filed on September 1, 2022, SEC File No. 1-16091) 10.12 Amendment Agreement No. 8, dated August 16, 2023, by and among Avient Corporation, the subsidiaries of Avient Corporation party thereto, Citibank, N.A., as administrative agent, Morgan Stanley Bank, N.A., as the Amendment No. 8 Additional Term Lender (as defined in the Term Loan Agreement), ad the other lenders party thereto (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K filed on August 17, 2023, SEC File No. 10.13+ Amended and Restated Avient Corporation 2010 Equity and Performance Incentive Plan (incorporated by reference to Appendix B to the Company’s definitive proxy statement on Schedule 14A filed on April 3, 2015, SEC File No. 10.14+ First Amendment to the Avient Supplemental Retirement Benefit Plan (As Amended and Restated Effective January 1, 2014), dated as of March 16, 2016; Amendment No. 2 to the Avient Supplemental Retirement Benefit Plan (As Amended and Restated Effective January 1, 2014), dated as of December 19, 2018; and Amendment No. 3 to the Avient Supplemental Retirement Benefit Plan (As Amended and Restated Effective January 1, 2014), dated as of April 18, 2019 (incorporated by reference to Exhibit 4.5 to the Company's Registration Statement on Form S-8, filed on May 6, 2019, SEC File No. 333-231236) 10.15+ Avient 2017 Equity and Incentive Compensation Plan (incorporated by reference to Appendix B to the Company's definitive proxy statement on Schedule 14A filed on March 31, 2017, SEC File No. 1-16091) 10.16+ Avient Corporation Deferred Compensation Plan for Non-Employee Directors (As Amended and Restated Effective July 15, 2021) (incorporated by reference to Exhibit 10.1 of the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2021, SEC File No. 1-16091) 10.17+ Form of Management Continuity Agreement for Executive Officers prior to 2011 (incorporated by reference to Exhibit 10.13 to the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2007, SEC File No. 10.18+ Form of Management Continuity Agreement for Executive Officers after 2011 (incorporated by reference to Exhibit 10.12 to the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2013, SEC File No. 10.19+** Schedule of Executive Officers and Others with Management Continuity Agreements 10.20+ Avient Supplemental Retirement Benefit Plan (As Amended and Restated Effective January 1, 2014) (incorporated by reference to Exhibit 10.14 to the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2013, SEC file No. 1-16091) 10.21 Assumption of Liabilities and Indemnification Agreement, dated March 1, 1993, amended and restated by Amended and Restated Assumption of Liabilities and Indemnification Agreement, dated April 27, 1993 (incorporated by reference to Exhibit 10.14 to The Geon Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 1996, SEC File No. 1-11804) 10.22+ Executive Severance Plan, as amended and restated effective May 15, 2014 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2014, SEC File No. 1-16091) 10.23+ Form of Director and Officer Indemnification Agreement (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed on July 5, 2006, SEC File No. 1-16091) 10.24+ Form of 2014 Award Agreement under the Avient Corporation 2010 Equity and Performance Incentive Plan, as amended (incorporated by reference to Exhibit 10.2 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2014, SEC File No. 1-16091) 10.25+ Form of 2021 Award Agreement under the Avient Corporation 2020 Equity and Incentive Compensation Plan (incorporated by reference to Exhibit 10.25 to the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2020, SEC File No. 1-16091) 67 AVIENT CORPORATION Exhibit No.

Management has assessed the effectiveness of PolyOne’s internal control over financial reporting as of December 31, 2016 and has prepared Management’s Annual Report On Internal Control Over Financial Reporting contained on page 66 of this Annual Report, which concludes that as of December 31, 2016, PolyOne’s internal control over financial reporting is effective and that no material weaknesses were identified. 9) Included for the first quarter 2015 are employee separation and restructuring costs of $10.6 million. 65POLYONE CORPORATION 66 ITEM 9.

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