LSR will generally withstand high levels of exposure to cleaning and disinfecting chemicals, but is susceptible to attacks by concentrated solvents (gasoline, mineral spirits) and acids (sulfuric acid, carbonic acid, citric acid found in car batteries, sodas and juices).¹

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 current margin percentage is (i) 1.00% per annum in the case of base rate advances, and (ii) 2.00% per annum in the case of LIBOR rate advances.

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.

2024 Proxy Statement PROXY STATEMENT 2024 NOTICE OF 2024 ANNUAL MEETING OF SHAREHOLDERS AND PROXY STATEMENT TABLE OF CONTENTS Letter to Shareholders i Notice of 2024 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 3 The 4Ps of Sustainability at Avient 4 Impact of our Performance on Named Executive Officer 2023 Compensation 8 Our Director Nominees and Committee Membership 10 Summary of Director Nominee Skills, Experience and Background 12 Governance Highlights 14 Proposal 1 - Election of Twelve Director Nominees to Our Board of Directors 16 Proposal 2 - Approval, on an Advisory Basis, of 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, 2024 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 and Diversity 37 2023 Non-Employee Director Compensation 38 Non-Employee Director Compensation Highlights 38 Non-Employee Director Retainer and Meeting Fees 38 2023 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 48 Other Aspects of our Compensation Programs 54 Executive Compensation 59 2023 Summary Compensation Table 59 2023 Grants of Plan-Based Awards 62 Outstanding Equity Awards at 2023 Fiscal Year-End 64 2023 Option Exercises and Stock Vested 65 2023 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 75 Risk Assessment of the Compensation Programs 75 Compensation Committee Report 76 Miscellaneous Provisions 77 Internet Availability of Proxy Materials 77 Voting at the Meeting 77 Revoking a Proxy 78 Shareholder Proposals 78 Proxy Solicitation 79 Householding of Proxy Materials 79 Appendix A A-1 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. ii PROXY STATEMENT We are providing the enclosed proxy materials to you in connection with the solicitation by the Board of Directors (the “Board”) of Avient Corporation ("Avient," "Avient Corporation," or the “Company”) of proxies to be voted at the Annual Meeting of Shareholders to be held on Thursday, May 16, 2024 (the “Annual Meeting”), and at any adjournments or postponements thereof. 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.

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.

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 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. 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.

LSR will generally withstand high levels of exposure to cleaning and disinfecting chemicals, but is susceptible to attacks by concentrated solvents (gasoline, mineral spirits) and acids (sulfuric acid, carbonic acid, citric acid found in car batteries, sodas and juices).¹

Aqueous Battery Gasket

LSR will generally withstand high levels of exposure to cleaning and disinfecting chemicals, but is susceptible to attacks by concentrated solvents (gasoline, mineral spirits) and acids (sulfuric acid, carbonic acid, citric acid found in car batteries, sodas and juices).¹