WHAT WE DO: WE ARE A FORMULATOR 6 CUSTOM FORMULATION M AY 3 , 2023 W EB CAS T Keeping Safety First o Relentless focus on best-in-class safety performance as an ACC Responsible Care® organization Exceeding Customer Expectations o Complementary technologies and customer relationships offer opportunity for future revenue synergies o Proven innovation-led commercial strategy with strong brands and participation across the full value chain Collaboration in Innovation o Leveraging Dyneema®, the world’s strongest fiber™, to accelerate growth of sustainable, ultralight and high performance applications People – Culture is Everything o Talented, passionate and collaborative associates drive an effective integration strategy o Strong Great Places to Work® scores reflect positive integration efforts in first year AVIENT PROTECTIVE MATERIALS INTEGRATION 8 AVIENT PROTECTIVE MATERIALS K E Y I N D U S T R I E S PERSONAL PROTECTION Military • Law Enforcement • First Responders • Body Armor • Helmets • Vehicle Protection 50% MARINE & SUSTAINABLE INFRASTRUCTURE Towing / Mooring • Aquaculture • Floating Wind • Offshore Cranes 30% CONSUMER Consumer • Outdoor High Performance • Safety Equipment 20% 9 Figures reflect approximate proportions of 2022 sales Q 1 P ER FO RM A N CE Q1 2023 PERFORMANCE VS.

WHAT WE DO: MATERIAL SCIENCE 5 CUSTOM FORMULATION FE BRUARY 1 5 , 2023 W EB CAS T Q4 2022 VS.

Aqueous Battery Gasket

WHAT WE DO: MATERIAL SCIENCE 5 CUSTOM FORMULATION M AY 3 , 2023 W EB CAS T Keeping Safety First o Relentless focus on best-in-class safety performance as an ACC Responsible Care® organization Exceeding Customer Expectations o Complementary technologies and customer relationships offer opportunity for future revenue synergies o Proven innovation-led commercial strategy with strong brands and participation across the full value chain Collaboration in Innovation o Leveraging Dyneema®, the world’s strongest fiber™, to accelerate growth of sustainable, ultralight and high performance applications People – Culture is Everything o Talented, passionate and collaborative associates drive an effective integration strategy o Strong Great Places to Work® scores reflect positive integration efforts in first year AVIENT PROTECTIVE MATERIALS INTEGRATION 7 AVIENT PROTECTIVE MATERIALS K E Y I N D U S T R I E S PERSONAL PROTECTION Military • Law Enforcement • First Responders • Body Armor • Helmets • Vehicle Protection 50% MARINE & SUSTAINABLE INFRASTRUCTURE Towing / Mooring • Aquaculture • Floating Wind • Offshore Cranes 30% CONSUMER Consumer • Outdoor High Performance • Safety Equipment 20% 8 Figures reflect approximate proportions of 2022 sales Q 1 P ER FO RM A N CE Q1 2023 PERFORMANCE VS.

P O L Y O N E C O R P O R A T I O N 13 PART II ITEM 5. The current margin percentage is (i) 1.00% per annum in the case of base rate advances, (ii) 2.00% per annum in the case of LIBOR rate advances. Off-Balance Sheet Arrangements We have no off-balance sheet arrangements as defined in Item 303(a)(4)(ii) of Regulation S-K.

The Base Rate is a fluctuating rate equal to the greater of (i) the Federal Funds Rate plus one-half percent, (ii) the prevailing LIBOR Rate plus one percent, and (iii) the prevailing Prime Rate. The Base Rate is a fluctuating rate equal to the greater of (i) the Federal Funds Rate plus one-half percent, (ii) the prevailing LIBOR Rate plus one percent, and (iii) the prevailing Prime Rate. MINE SAFETY DISCLOSURES PART II ITEM 5.

2022 Proxy Statement TABLE OF CONTENTS Message from our CEO i Notice of 2022 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 1 Advance Voting Methods 2 Voting During the Annual Meeting 2 Questions 3 Company Operating Performance 3 Our Company Culture 4 The 4Ps of Sustainability at Avient 4 Impact of our Performance on Named Executive Officer 2021 Compensation 9 Our Director Nominees and Committee Membership 11 Summary of Director Nominee Skills, Experience and Background 12 Governance Highlights 13 Proposal 1 - Election of Twelve Director Nominees to Our Board of Directors 16 Proposal 2 - Advisory Vote to Approve Named Executive Officer Compensation 23 Proposal 3 - Ratification of the Appointment of Ernst & Young LLP as Our Independent Registered Public Accounting Firm for the Fiscal Year Ending December 31, 2022 25 Independent Registered Public Accountant Services and Related Fee Arrangements 25 Report of the Audit Committee 26 Corporate Governance 28 Director Independence 28 Lead Director 29 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 Board 32 Board and Committees 32 Board Refreshment and Diversity 36 2021 Non-Employee Director Compensation 38 Non-Employee Director Compensation Highlights 38 Non-Employee Director Retainer and Meeting Fees 38 2021 Non-Employee Director Compensation Table 39 Option Awards Outstanding and 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 46 What We Pay and Why: Elements of Compensation 49 Other Aspects of our Compensation Programs 55 Executive Compensation 59 2021 Summary Compensation Table 59 2021 Grants of Plan-Based Awards 61 Outstanding Equity Awards at 2021 Fiscal Year-End 63 2021 Option Exercises and Stock Vested 64 2021 Non Qualified Deferred Compensation 64 Potential Payments Upon Termination or Change of Control 65 CEO Pay Ratio Disclosure 70 Compensation Committee Interlock and Insider Participation 70 Risk Assessment of the Compensation Programs 71 Compensation Committee Report 71 Miscellaneous Provisions 72 Voting at the Meeting 72 Revoking a Proxy 72 Shareholder Proposals 73 Proxy Solicitation 73 Appendix A A-1 i MESSAGE FROM OUR CEO March 29, 2022 Dear Fellow Shareholder: We have decided to hold the Annual Meeting virtually because doing so enables greater shareholder attendance and participation from any location around the world, and reduces the cost and environmental impact of the Annual Meeting. Patterson Chairman, President and Chief Executive Officer Avient Corporation Please refer to the accompanying materials for voting instructions. ii NOTICE OF 2022 ANNUAL MEETING OF SHAREHOLDERS Thursday, May 12, 2022 9:00 a.m. REVOKING A PROXY If you are a shareholder of record, you may revoke your proxy before it is voted by: (i) sending a written notice to our Secretary bearing a later date than the previously delivered proxy, stating that you revoke your proxy; (ii) mailing a completed and signed proxy card bearing a later date than the previously delivered proxy; (iii) voting by telephone or internet at a later date than the previously delivered proxy; or (iv) participating in the Annual Meeting and voting electronically online during the Annual Meeting.

Jazan Road, Industrial City II Street 23 P.O.

Avient (i) incurred $575.0 million of borrowings under a new Senior Secured Term Loan due 2029 and (ii) issued $725.0 million aggregate principal of the 2030 Notes to finance a portion of the APM Acquisition. Avient (i) incurred $575.0 million of borrowings under a new Senior Secured Term Loan due 2029 and (ii) issued $725.0 million aggregate principal of 7.125% Senior Notes due 2030 to finance a portion of the APM Acquisition. MINE SAFETY DISCLOSURES PART II ITEM 5.

POLYONE CORPORATION 19 PART II ITEM 5. The interest rate associated with the term loan is 300 basis points plus the greater of (i) the 1-, 2-, 3- or 6-month LIBOR, at the Company’s discretion, or (ii) 75 basis points. The interest rate associated with the term loan is 300 basis points plus the greater of (i) the 1-, 2-, 3- or 6-month LIBOR, at the Company’s discretion, or (ii) 75 basis points.