Si vous faites des affaires dans d’autres pays ou avec des personnes d’autres pays, ou si vous voyagez à l’étranger, communiquez avec le service juridique d’Avient pour obtenir des conseils. 23 Table des matières Responsabilité sociale d’entreprise 24 Table des matières Développement durable Les associés, les clients et les fournisseurs ne sont pas les seules parties intéressées d’Avient.

Si vous exercez votre activité dans d’autres pays ou avec des personnes d’autres pays, ou si vous vous rendez dans d’autres pays, consultez le département juridique d’Avient pour obtenir des conseils. 23 Table des matières Responsabilité sociale d’entreprise 24 Table des matières Durabilite Les collaborateurs, clients et fournisseurs ne sont pas les seuls partenaires d’Avient.

Row 1 (2.5.1.1) Water pollutant category Select from: 22 ☑ Other physical pollutants (2.5.1.2) Description of water pollutant and potential impacts Our standard focuses on taking a general approach to water protection rather than specifying water pollutants. (2.5.1.3) Value chain stage Select all that apply ☑ Direct operations (2.5.1.4) Actions and procedures to minimize adverse impacts Select all that apply ☑ No formal procedure(s) in place (2.5.1.5) Please explain Sites are required to adhere to Avient's Spill Prevention and Water Protection standard, which outlines commitment, responsibilities, and approaches to minimize water pollutants that can cause harm to the environment or human health [Add row] 23 C3. Row 23 (7.26.1) Requesting member Select from: (7.26.2) Scope of emissions Select from: ☑ Scope 2: location-based (7.26.4) Allocation level Select from: ☑ Company wide 230 (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 516 (7.26.9) Emissions in metric tonnes of CO2e 215.47 (7.26.10) Uncertainty (±%) 10 (7.26.11) Major sources of emissions NA (7.26.12) Allocation verified by a third party? Row 23 (9.3.1.1) Facility reference number Select from: ☑ Facility 53 (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 Turkey ☑ Other, please specify :Kocaeli (9.3.1.8) Latitude 0 (9.3.1.9) Longitude 470 0 (9.3.1.10) Located in area with water stress Select from: ☑ No (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 (9.3.1.19) Withdrawals from produced/entrained water 0 471 (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 (9.3.1.28) Comparison of total consumption with previous reporting year Select from: 472 ☑ About the same (9.3.1.29) Please explain Avient does not externally disclose water information at the site level.

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. We believe you should vote “FOR” our Named Executive Officer compensation program and approve the following resolution because the compensation actually earned by our Named Executive Officers for our ADVISORY VOTE PROXY STATEMENT 2024 | Annual Meeting of Shareholders 23 2023 performance was aligned with our pay-for-performance objectives, our Company’s performance and shareholder interests: “RESOLVED, that the compensation paid to Avient’s Named Executive Officers, as disclosed pursuant to Item 402 of Regulation S-K, including the Compensation Discussion and Analysis, compensation tables and related narrative discussion, is hereby APPROVED.” OWNERSHIP OF AVIENT SHARES PROXY STATEMENT 2024 | Annual Meeting of Shareholders 41 The following table shows information relating to all persons who, as of February 28, 2024, were known by us to beneficially own more than five percent of our outstanding common shares based on information provided in Schedule 13Gs and 13Ds filed with the SEC: Name and Address Number of Common Shares % of Class(3) BlackRock, Inc. 50 Hudson Yards New York, New York 10001(1) 11,172,204 12.2% The Vanguard Group 100 Vanguard Boulevard Malvern, Pennsylvania 19355(2) 10,368,900 11.4% (1) Based on information contained in a Schedule 13G/A filed by BlackRock, Inc. with the SEC on January 23, 2024.

23 विषय-सूची कॉरप्ोर टे सामाजि क जि मम् देार ी 24 विषय-सूची सततता Avient में सहयोगी, ग्राहक और आपूर्तिकर्ता एकमात्र हितधारक नहीं हैं।

Avient CDP Climate Change Questionnaire 2022 Friday, July 29, 2022 23 Have climate-related risks and opportunities influenced your strategy in this area?

Common Shares delivered under an award in the nature of a purchase right granted under the 2017 Plan will be purchased forff such consideration, paid for at such time, by such methods, and in such forff ms, including, without limitation, cash, Common Shares, other awards, notes or other property, as the Committee determines. 23 EQUITY PLAN In addition, the Committee may grant cash awards, as an element of or supplement to any other awards granted under the 2017 Plan.

Director since: 2011 Age: 61 Current Public Company Directorships: • Modine Manufacturing Company Former Directorships: • Anzu Special Acquisition Corp I • Ashland • Carpenter Technology • Valvoline ELECTION OF BOARD OF DIRECTORS PROXY STATEMENT 2023 | Annual Meeting of Shareholders 23 PROPOSAL 2 — APPROVAL, ON AN ADVISORY BASIS, OF NAMED EXECUTIVE OFFICER COMPENSATION As required under the Dodd-Frank Wall Street Reform and Consumer Protection Act (the "Dodd-Frank Act") and Section 14A of the Securities Exchange Act of 1934 (the “Exchange Act”), our Board is submitting a “Say on Pay” proposal for shareholder consideration.