DOLLAR S ADJUSTED EARNINGS PER SHARE* *2009 has not been restated for subsequent changes in accounting principles or discontinued operations .60 .50 .40 .30 .20 .10 0 2009 2010 2011 2012 2013 2014 2015 25 CO NSECU TIVE Q UARTE RS OF YOY E PS GR OWTH 0 + 43 + 49 + 52 + 59 + 66 + 7622 + 47 + 52 + 61 + 61 + 74 + 8739 + 48 + 46 + 61 + 60 + 74 + 8737 + 36 + 37 + 49 + 51 + 63 + 68PERCENTAGE ADJUSTED CONSOLIDATED OPERATING MARGIN 12% 10% 8% 6% 4% 2% 0% 2009 2010 2011 2012 2013 2014 2015 8 2.8% 5.2% 5.6% 6.7% 6.9% 8.3% 9.5% 4 products introduced in the last five years. Rodriguez 48 Senior Vice President, Chief Human Resource Officer John V. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA Index to Financial Statement Page Management’s Report 41 Reports of Independent Registered Public Accounting Firm 42-43 Consolidated Financial Statements: Consolidated Statements of Income 44 Consolidated Statements of Comprehensive Income 45 Consolidated Balance Sheets 46 Consolidated Statements of Cash Flows 47 Consolidated Statements of Shareholders’ Equity 48 Notes to Consolidated Financial Statements 49-79 40 POLYONE CORPORATION MANAGEMENT’S REPORT The management of PolyOne Corporation is responsible for preparing the consolidated financial statements and disclosures included in this Annual Report on Form 10-K.

Initiative category & Initiative type Energy efficiency in buildings Avient CDP Climate Change Questionnaire 2022 Friday, July 29, 2022 42 Lighting Estimated annual CO2e savings (metric tonnes CO2e) 330.9 Scope(s) or Scope 3 category(ies) where emissions savings occur Scope 2 (location-based) Scope 2 (market-based) Voluntary/Mandatory Voluntary Annual monetary savings (unit currency – as specified in C0.4) 318,550 Investment required (unit currency – as specified in C0.4) 717,464 Payback period 1-3 years Estimated lifetime of the initiative 6-10 years Comment Initiative category & Initiative type Energy efficiency in buildings Insulation Estimated annual CO2e savings (metric tonnes CO2e) 0.11 Scope(s) or Scope 3 category(ies) where emissions savings occur Scope 1 Voluntary/Mandatory Voluntary Annual monetary savings (unit currency – as specified in C0.4) 2,250 Investment required (unit currency – as specified in C0.4) 11,610 Payback period 4-10 years Estimated lifetime of the initiative Avient CDP Climate Change Questionnaire 2022 Friday, July 29, 2022 43 11-15 years Comment Initiative category & Initiative type Energy efficiency in buildings Heating, Ventilation and Air Conditioning (HVAC) Estimated annual CO2e savings (metric tonnes CO2e) 9.33 Scope(s) or Scope 3 category(ies) where emissions savings occur Scope 1 Voluntary/Mandatory Voluntary Annual monetary savings (unit currency – as specified in C0.4) 76,653 Investment required (unit currency – as specified in C0.4) 203,000 Payback period 1-3 years Estimated lifetime of the initiative 11-15 years Comment Initiative category & Initiative type Energy efficiency in buildings Motors and drives Estimated annual CO2e savings (metric tonnes CO2e) 5.06 Scope(s) or Scope 3 category(ies) where emissions savings occur Scope 2 (location-based) Scope 2 (market-based) Voluntary/Mandatory Voluntary Annual monetary savings (unit currency – as specified in C0.4) Avient CDP Climate Change Questionnaire 2022 Friday, July 29, 2022 44 2,280 Investment required (unit currency – as specified in C0.4) 541 Payback period Intensity figure 0.000021695 Metric numerator (Gross global combined Scope 1 and 2 emissions, metric tons CO2e) 104,134 Metric denominator unit total revenue Metric denominator: Unit total 4,800,000,000 Scope 2 figure used Market-based % change from previous year 30.6 Direction of change Decreased Reason for change Our revenue increased by 48% while our overall scope 1+2 emissions increased by 3%, leading to a 30.60% decrease of the intensity overall.

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. COMPENSATION DISCUSSION AND ANALYSIS 48 PROXY STATEMENT 2024 | Annual Meeting of Shareholders 2023 Annual Incentive.

FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA Index to Financial Statements Page Management’s Report 40 Reports of Independent Registered Public Accounting Firm 41-42 Consolidated Financial Statements: Consolidated Statements of Income 43 Consolidated Statements of Comprehensive Income 44 Consolidated Balance Sheets 45 Consolidated Statements of Cash Flows 46 Consolidated Statements of Shareholders’ Equity 47 Notes to Consolidated Financial Statements 48-78 POLYONE CORPORATION 39 MANAGEMENT’S REPORT The management of PolyOne Corporation is responsible for preparing the consolidated financial statements and disclosures included in this Annual Report on Form 10-K. We also record bad debt allowances for all other customers based on a variety of factors including the length of time the receivables are past 48 POLYONE CORPORATION due, the financial health of the customer, economic conditions and historical experience.

Row 18 (3.2.1) Country/Area & River basin Chile ☑ Unknown (3.2.2) Value chain stages where facilities at risk have been identified in this river basin Select all that apply ☑ Direct operations (3.2.3) Number of facilities within direct operations exposed to water-related risk in this river basin 1 (3.2.4) % of your organization’s total facilities within direct operations exposed to water-related risk in this river basin Select from: ☑ Less than 1% (3.2.10) % organization’s total global revenue that could be affected Select from: ☑ Less than 1% (3.2.11) Please explain Data based on sites with extremely high water risk level from WRI. 48 Row 19 (3.2.1) Country/Area & River basin Peru ☑ Unknown (3.2.2) Value chain stages where facilities at risk have been identified in this river basin Select all that apply ☑ Direct operations (3.2.3) Number of facilities within direct operations exposed to water-related risk in this river basin 1 (3.2.4) % of your organization’s total facilities within direct operations exposed to water-related risk in this river basin Select from: ☑ Less than 1% (3.2.10) % organization’s total global revenue that could be affected Select from: ☑ Less than 1% (3.2.11) Please explain Data based on sites with extremely high water risk level from WRI. Row 48 (7.26.1) Requesting member Select from: (7.26.2) Scope of emissions Select from: ☑ Scope 3 (7.26.3) Scope 3 category(ies) Select all that apply ☑ Category 2: Capital goods ☑ Category 1: Purchased goods and services ☑ Category 6: Business travel ☑ Category 10: Processing of sold products ☑ Category 7: Employee commuting ☑ Category 5: Waste generated in operations ☑ Category 8: Upstream leased assets ☑ Category 12: End-of-life treatment of sold products ☑ Category 13: Downstream leased assets ☑ Category 9: Downstream transportation and distribution 271 ☑ Category 3: Fuel-and-energy-related activities (not included in Scopes 1 or 2) (7.26.4) Allocation level Select from: ☑ Company wide (7.26.6) Allocation method Select from: ☑ Allocation based on the volume of products purchased (7.26.7) Unit for market value or quantity of goods/services supplied Select from: ☑ Metric tons (7.26.8) Market value or quantity of goods/services supplied to the requesting member 47 (7.26.9) Emissions in metric tonnes of CO2e 704.66 (7.26.10) Uncertainty (±%) 10 (7.26.11) Major sources of emissions NA (7.26.12) Allocation verified by a third party? Row 48 (9.3.1.1) Facility reference number Select from: ☑ Facility 5 (9.3.1.3) Value chain stage Select from: ☑ Direct operations (9.3.1.4) Dependencies, impacts, risks, and/or opportunities identified at this facility Select all that apply ☑ Risks (9.3.1.5) Withdrawals or discharges in the reporting year Select from: ☑ Yes, withdrawals and discharges (9.3.1.7) Country/Area & River basin Peru ☑ Other, please specify :Pacific Coast (9.3.1.8) Latitude 547 0 (9.3.1.9) Longitude 0 (9.3.1.10) Located in area with water stress Select from: ☑ Yes (9.3.1.13) Total water withdrawals at this facility (megaliters) 0 (9.3.1.14) Comparison of total withdrawals with previous reporting year Select from: ☑ About the same (9.3.1.15) Withdrawals from fresh surface water, including rainwater, water from wetlands, rivers and lakes 0 (9.3.1.16) Withdrawals from brackish surface water/seawater 0 (9.3.1.17) Withdrawals from groundwater - renewable 0 (9.3.1.18) Withdrawals from groundwater - non-renewable 0 548 (9.3.1.19) Withdrawals from produced/entrained water 0 (9.3.1.20) Withdrawals from third party sources 0 (9.3.1.21) Total water discharges at this facility (megaliters) 0 (9.3.1.22) Comparison of total discharges with previous reporting year Select from: ☑ About the same (9.3.1.23) Discharges to fresh surface water 0 (9.3.1.24) Discharges to brackish surface water/seawater 0 (9.3.1.25) Discharges to groundwater 0 (9.3.1.26) Discharges to third party destinations 0 (9.3.1.27) Total water consumption at this facility (megaliters) 0 549 (9.3.1.28) Comparison of total consumption with previous reporting year Select from: ☑ About the same (9.3.1.29) Please explain Avient does not externally disclose water information at the site level.

North Baltimore, Ohio 48. John Midea, Jr. 57 Senior Vice President, Global Operations and Process Improvement Woon Keat Moh 48 Senior Vice President, President of Color, Additives and Inks, Americas and Asia Chris L. The ABL Amendment, among other things, (i) increased the Company’s total revolving credit line to $500 million (which may 48 AVIENT CORPORATION be increased by up to $150 million subject to the Company meeting certain requirements and obtaining commitments for such increase) (the Revolving Credit Facility), subject to the borrowing base limitations, (ii) extended the maturity date of the Revolving Credit Facility to October 26, 2026 (subject to certain exceptions), (iii) modified the borrowing base to include qualified cash subject to certain limitations, (iv) modified the applicable margin and the unused line fee to be based on availability, and (v) modified certain negative covenants to provide additional flexibility.

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. COMPENSATION DISCUSSION AND ANALYSIS 48 PROXY STATEMENT 2024 | Annual Meeting of Shareholders 2023 Annual Incentive.

2023 Proxy Statement CREATING A WORLD-CLASS, SUSTAINABLE ORGANIZATION PROXY STATEMENT 2023 NOTICE OF 2023 ANNUAL MEETING OF SHAREHOLDERS AND PROXY STATEMENT TABLE OF CONTENTS Message from our CEO i Notice of 2023 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 2022 Compensation 9 Our Director Nominees and Committee Membership 11 Summary of Director Nominee Skills, Experience and Background 12 Governance Highlights 14 Proposal 1 - Election of Twelve Director Nominees to Our Board of Directors 17 Proposal 2 - Approval, on an Advisory Basis, of Named Executive Officer Compensation 24 Proposal 3 - Approval, on an Advisory Basis, of the Frequency of Future Advisory Votes to Approve Named Executive Officer Compensation 26 Proposal 4 - Approval of the Amendment and Restatement of the Avient Corporation 2020 Equity and Incentive Compensation Plan 27 Proposal 5 - Ratification of the Appointment of Ernst & Young LLP as Our Independent Registered Public Accounting Firm for the Fiscal Year Ending December 31, 2023 42 Independent Registered Public Accountant Services and Related Fee Arrangements 42 Report of the Audit Committee 43 Corporate Governance 45 Director Independence 45 Lead Director 46 Board Leadership Structure 46 Majority Voting for Directors 46 Board Oversight of Risk 46 Board Oversight of ESG and Sustainability Matters 47 Code of Ethics, Code of Conduct and Corporate Governance Guidelines 48 Related Person Transactions 48 Communication with the Board 49 Board and Committees 49 Board Refreshment and Diversity 54 2022 Non-Employee Director Compensation 55 Non-Employee Director Compensation Highlights 55 Non-Employee Director Retainer and Meeting Fees 55 2022 Non-Employee Director Compensation Table 56 Option Awards Outstanding and Fully Vested Deferred Shares 57 Ownership of Avient Shares 58 Beneficial Ownership of Our Common Shares 58 Stock Ownership Guidelines for Non-Employee Directors 59 Compensation Discussion and Analysis 60 Executive Summary 60 Executive Compensation Philosophy and Objectives 63 What We Pay and Why: Elements of Compensation 65 Other Aspects of our Compensation Programs 71 Executive Compensation 74 2022 Summary Compensation Table 74 2022 Grants of Plan-Based Awards 76 Outstanding Equity Awards at 2022 Fiscal Year-End 78 2022 Option Exercises and Stock Vested 79 2022 Non Qualified Deferred Compensation 79 Potential Payments Upon Termination or Change of Control 80 CEO Pay Ratio Disclosure 85 Pay Versus Performance Disclosure 86 Compensation Committee Interlocks and Insider Participation 89 Risk Assessment of the Compensation Programs 89 Compensation Committee Report 89 Miscellaneous Provisions 90 Voting at the Meeting 90 Revoking a Proxy 91 Shareholder Proposals 91 Proxy Solicitation 92 Appendix A A-1 Appendix B B-1 MESSAGE FROM OUR CEO March 29, 2023 Dear Fellow Shareholder: You are cordially invited to attend and participate in the Avient Corporation 2023 Annual Meeting of Shareholders (the “Annual Meeting”), which will be held virtually via live webcast at 9:00 a.m. CORPORATE GOVERNANCE 48 PROXY STATEMENT 2023 | Annual Meeting of Shareholders COMMUNICATION WITH THE BOARD Shareholders and other interested parties who wish to communicate directly with the Board as a group, the non-management or independent Directors as a group, or with any individual Director may do so by writing to the Secretary, Avient Corporation, 33587 Walker Road, Avon Lake, Ohio 44012.

Financial and operating statistics for our peer group referenced during 2021 compensation decisions are summarized below: COMPENSATION DISCUSSION AND ANALYSIS 48 PROXY STATEMENT 2022 | Annual Meeting of Shareholders Factor Median Peer Group Comparator 2020 Financials 2021 Avient Results Company Revenue $4.4 billion $4.8 billion Total Asset Size $6.2 billion $5.0 billion Employee Numbers 6,400 8,700 Each of the companies constituting our peer group for 2021 compensation consideration met a majority of the primary criteria that were established.

Threshold equates to vesting EXECUTIVE COMPENSATION 48 in one-third of the SAR award.