T H E N E W P O L Y O N E : A S P E C I A L T Y G R O W T H C O M P A N Y SERVICE: T H E T I M E L E S S D I F F E R E N T I A T O R PolyOne Corporation 31 T A L E N T D E V E L O P M E N T PolyOne Corporation 32 Leadership Program Participants 2012 2013 2015 47 86 2016 2018 125 169 315 Campus Hires 2008 2011 2017 25 90 47 PolyOne LSS Blackbelts 2008 2011 2018 67 220 147 2018 141 A U N I Q U E C U S T O M E R E X P E R I E N C E Industrial Design IQ DESIGN LABS PolyOne Corporation 33 Material & Color Expertise Manufacturing Expertise 3 14 Industrial designers $0 $10M $4M $80M Opportunity funnel New business revenue LSS CUSTOMER FIRST PolyOne Corporation 34 Customer Projects 2 104 3 D P R I N T I N G B R I N G I N G N E W I D E A S T O L I F E PolyOne Corporation 35 PolyOne Corporation 36 99.9% up to 24 weeks 6 hours C O L O R M A T R I X S E L E C T ™ I N N O V A T I N G W I T H P O L Y O N E PolyOne Corporation 37 SEGMENT HIGHLIGHTS C O L O R , A D D I T I V E S & I N K S PolyOne Corporation 38 Solid Colorants Performance Additives Screen Printing Inks Liquid Colorants 14% Textiles 13% Building & Construction 8% 8% Appliances Electrical & Electronic 1% Operating Income & MarginRevenue by Region C O L O R , A D D I T I V E S & I N K S 2 0 1 8 R E V E N U E | O V ER $ 1 B I L L I O N $4 $25 $104 $159 0.9% 5.5% 12.2% 15.1% PolyOne Corporation 39 45% 14% 1% Mexico South America S P E C I A L T Y E N G I N E E R E D M A T E R I A L S PolyOne Corporation 40 Engineered Formulations Advanced Composites Thermoplastic Elastomers 21% 13%Healthcare 9% 9% Building & Construction 4% Electrical & Electronics 16% S P E C I A L T Y E N G I N E E R E D M A T E R I A L S Revenue by Region Operating Income & Margin 2 0 1 8 R EV EN U E | $ 6 4 6 M I L L I O N PolyOne Corporation 41 $21 $57 $72 0.1% 5.1% 9.3% 11.2% 46% 24% P E R F O R M A N C E P R O D U C T S & S O L U T I O N S PolyOne Corporation 42 Specialty Vinyl Solutions Healthcare Formulations Smart Device Flame Retardant Polymers Building & 16%Consumer 4% Electrical & 4% Asia 78% Mexico P E R F O R M A N C E P R O D U C T S & S O L U T I O N S Operating Income & MarginRevenue by Region 2 0 1 8 R EV EN U E | $ 7 3 6 M I L L I O N $40 $24 $56 $74 4.6% 3.6% 7.2% 10.0% PolyOne Corporation 43 D I S T R I B U T I O N EN D M A R K ET S & S U P P L I ER S PolyOne Corporation 44 27% 22% Electrical & Building & $20 $25 $63 $71 2.9% 4.0% 5.9% 5.6% Operating Income & Margin2018 Revenue | $1.3 Billion http://www.polyone.com/Pages/VariationRoot.aspx O V E R V I E W O F R A W M A T E R I A L P U R C H A S E S PolyOne Corporation 45 T A R G E T E N D M A R K E T S & A P P L I C A T I O N E X A M P L E S PolyOne Corporation 46 Thermally Conductive Chemical Resistant Polymer Colorants Elastomeric Grips and Handles Structural Composites Antimicrobial Technologies Anti-Counterfeiting Target End Markets… Healthcare Catheter Technologies Under-hood Components Target End Markets… Automotive Interior Structural Sound & Vibration Management Roof Systems Air Management Electronics and Cameras Lighting Exterior / Interior Trim Braces & Brackets Fasteners Seals & Flaps Target End Markets… Consumer Thermally Conductive Polymer Colorants Elastomeric Grips and Handles Structural Composite Oxygen Scavenger Laser Marking Additives Antistatic Technologies UV Light Barrier Technologies Cap & Closure Colorants Process Optimization Antioxidant Technologies Density Modified Target End Markets… Packaging Luxury Packaging GravitechTM Density Modified Polymers Optimize Color Usage OnColorTM Super Concentrates Combat Bacteria Formation WithStandTM Antimicrobial Technology Medical Device Housings Chemically Resistant Engineered Polymers Color & Design Services Outdoor Applications Fiber Colorants Reconciliation of Non-GAAP Financial Measures (Unaudited) (Dollars in millions, except per share data) Senior management uses comparisons of adjusted net income from continuing operations attributable to PolyOne shareholders and diluted adjusted earnings per share (EPS) from continuing operations attributable to PolyOne shareholders, excluding special items, to assess performance and facilitate comparability of results.

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. Kunkle – 65%. This plan is an unfunded, non qualified plan that provides benefits similar PROXY STATEMENT 2024 | Annual Meeting of Shareholders 65 to our Qualified Savings Plan, but without Internal Revenue Code contribution and earnings limitations.

Our filings are available to the public at the SEC’s website at http://www.sec.gov. The obligations of PolyOne under the term loan are secured by a first lien on certain existing and future property and assets of PolyOne and certain of its U.S. subsidiaries, a 100% pledge of the voting capital stock of PolyOne’s U.S. subsidiaries, a 65% pledge of the voting capital stock of PolyOne’s direct foreign subsidiaries (subject to certain exceptions) and a second lien on U.S. accounts receivable and inventory. Spartech et. al. also alleges that PolyOne, Merger Sub, and Merger POLYONE CORPORATION 65 LLC have aided and abetted the directors of Spartech in breaching their fiduciary duties.

During the course of our efforts, we did not sacrifice our intermediate or long-term growth potential or deviate from our proven four-pillar strategy—achieving many important successes as follows: SPECIALIZATION 65% of our operating income was generated from our specialty businesses in 2015—continuing the highest level in the history of our company. Our filings are available to the public at the SEC’s website at http://www.sec.gov. Following are our contributions to the RSP: Retirement savings match $ 9.9 $ 9.7 $ 9.8 Retirement benefit contribution 4.1 4.0 4.0 Total contributions $ 14.0 $ 13.7 $ 13.8 POLYONE CORPORATION 65 Note 13 — COMMITMENTS AND CONTINGENCIES Environmental — We have been notified by federal and state environmental agencies and by private parties that we may be a potentially responsible party (PRP) in connection with the environmental investigation and remediation of certain sites.

With 65 percent of our OI generated from specialty solutions—compared to just 2 percent in 2005—it truly exemplifies just how far we’ve come in our transformation from the volume-driven, commodity-focused company of the past. Our filings are available to the public at the SEC’s website at http://www.sec.gov. Following are our contributions to the RSP: Retirement savings match $ 9.7 $ 9.8 $ 7.6 Retirement benefit contribution 4.0 4.0 3.8 Total contributions $ 13.7 $ 13.8 $ 11.4 POLYONE CORPORATION 65 Note 13 — COMMITMENTS AND CONTINGENCIES Environmental — We or our subsidiaries have been notified by federal and state environmental agencies and by private parties that we may be a potentially responsible party (PRP) in connection with the investigation and remediation of certain environmental sites.

https://www.cdp.net/en/info/terms-and-conditions/terms-of-disclosure/corporate-questionnaire 1 Contents 2 C1. 4.1.6) Attach the policy (optional) 65 3b - Corporate Governance Guidelines.Draft Feb. 2024.v1.2.Revised.4-16-24.Final_.pdf [Fixed row] (4.1.1) Is there board-level oversight of environmental issues within your organization? https://www.avient.com/idea/eco-conscious-alternative-coloring-textiles [Fixed row] (9.15.1) Indicate whether you have targets relating to water pollution, water withdrawals, WASH, or other water-related categories.

Richardson – 65%; and Messrs. Crist’s annual incentive opportunity was increased from 50% to 55% to reflect his new responsibilities To attract and help retain talent Fixed base of cash compensation 16% - CEO 33% - CFO 39% - Other NEOs Base Salary Drives the achievement of key business results on an annual basis Performance- based and not guaranteed 19% - CEO 21% - CFO 21% - Other NEOs Annual Incentive Directly ties the interests of NEOs to our shareholders Helps retain key talent and a majority is performance- based and not guaranteed 65% - CEO 46% - CFO 40% - Other NEOs Long- Term Incentive as Senior Vice President, President of CAI.

Tianjin, China 65. Management has assessed the effectiveness of Avient’s internal control over financial reporting as of December 31, 2022 and has prepared Management’s Annual Report On Internal Control Over Financial Reporting contained on page 65 of this Annual Report, which concludes that as of December 31, 2022, 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 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.

Cota, Colombia 65. PRINCIPAL ACCOUNTANT FEES AND SERVICES Information regarding fees paid to and services provided by Avient’s independent registered public accounting firm and the pre-approval policies and procedures of the audit committee is incorporated by reference to the information contained in the 2024 Proxy Statement. 65 AVIENT CORPORATION PART IV ITEM 15.

PolyOne’s stock performance has significantly outpaced the S&P 500 index and the S&P Mid Cap 400 Chemicals index. 12.31.09 6.30.10 12.31.10 6.30.11 12.31.11 6.30.12 12.31.12 6.30.13 12.31.13 2007 2008 2009 2010 2011 2012 2013 SPECIALTY PLATFORM OPERATING INCOME % OF TOTAL*^ 1.50 1.20 .90 .60 .30 2007 2008 2009 2010 2011 2012 2013 ADJUSTED EARNINGS PER SHARE*† * 2010–2013 Specialty Operating Income is restated for the divestiture of the Resin Business ^Operating Income excludes Corporate Charges * 2010–2013 adjusted EPS is restated for the divestiture of the Resin Business † EPS excluding special items and equity income from SunBelt 2007 2008 2009 2010 2011 2012 2013 * 2010–2013 adjusted return on sales is restated for the divestiture of the Resin Business ° Operating Income as a percentage of sales, excluding special items and equity income from SunBelt ADJUSTED RETURN ON SALES*º 8 6 4 2 P 80 60 40 20 P Operating Income % Specialty PP&S Distribution Specialty Platform Operating Income % of Total ROIC** (after-tax) 2006 1.5% 5.5% 2.6% 6.0% 5.0% 9.4% 7.2% 5.9% 62.0% 9.1% 2015 TARGET 12%–16% 9%–12% 6%–7.5% 65%–75% 15% **ROIC is defined as adjusted OI divided by the sum of average debt and equity over a 5 quarter period 200 160 120 80 40 2007 2008 2009 2010 2011 2012 2013 SPECIALTY PLATFORM OPERATING INCOME* * 2010–2013 Operating Income is restated for the divestiture of the Resin Business 400 300 200 100 P POLYONE STOCK (POL) PERFORMANCE VERSUS S&P POL S&P MID CAP 400 CHEMICALS S&P 500 United States Securities and Exchange Commission Washington, DC 20549 FORM 10-K Í ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2013 ‘ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Our filings are available to the public at the SEC’s website at http://www.sec.gov. The fair values of pension plan assets at December 31, 2013 and 2012, by asset category, are as follows: Fair Value of Plan Assets at Fair Value of Plan Assets at Quoted Prices in Active Markets Observable (Level 3) Total Quoted Prices in Active Markets Observable (Level 3) Total Asset category Cash $ 6.6 $ — $ — $ 6.6 $ 3.4 $ — $ — $ 3.4 Common collective trusts — 14.8 — 14.8 — 44.9 — 44.9 Large-cap equity 28.4 30.0 — 58.4 43.2 51.1 — 94.3 Mid-cap equity — — — — 42.3 — — 42.3 Small-cap equity 22.0 — — 22.0 39.8 — — 39.8 International equity 59.6 — — 59.6 80.6 — — 80.6 Fixed-income funds 275.5 — — 275.5 39.3 — — 39.3 Multi-asset mutual fund — — — — 32.6 — — 32.6 Floating rate income funds 35.3 — — 35.3 33.2 — — 33.2 Totals $ 427.4 $ 44.8 $ — $ 472.2 $ 314.4 $ 96.0 $ — $ 410.4 POLYONE CORPORATION 65 Large cap equity funds invest primarily in U.S. publicly-traded equity securities of companies with a market capitalization typically in excess of $10 billion with a focus on growth or value.