i NOTICE OF 2024 ANNUAL MEETING OF SHAREHOLDERS Thursday, May 16, 2024 9:00 a.m. Please carefully review the proxy materials for the Annual Meeting, which will be held virtually via live webcast on Thursday, May 16, 2024 at 9:00 a.m. The Annual Meeting webcast will begin promptly at 9:00 a.m.

NOTICE OF 2017 ANNUAL MEETING OF SHAREHOLDERS AND PROXY STATEMENT PolyOne Corporation TABLE OF CONTENTS MESSAGE FROM OUR CEO............................................................................................................................................................................................i NOTICE OF 2017 ANNUAL MEETING OF SHAREHOLDERS..........................................................................................................................ii PROXY SUMMARY............................................................................................................................................................................................................1 PROXY STATEMENT.......................................................................................................................................................................................................5 PROPOSAL 1 — ELECTION OF BOARD OF DIRECTORS .................................................................................................................................6 PROPOSAL 2 — ADVISORY VOTE TO APPROVE NAMED EXECUTIVE OFFICER COMPENSATION.........................................11 PROPOSAL 3 — ADVISORY VOTE TO APPROVE THE FREQUENCY OF FUTURE ADVISORY VOTES TO APPROVE NAMED EXECUTIVE OFFICER COMPENSATION.....................................................................................................12 PROPOSAL 4 — APPROVAL OF THE POLYONE CORPORATION 2017 EQUITY AND INCENTIVE COMPENSATION PLAN.............................................................................................................................................................................13 PROPOSAL 5 — RATIFICATION OF APPOINTMENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM..................................................................................................................................................................................................................30 CORPORATE GOVERNANCE.....................................................................................................................................................................................33 2016 NON-EMPLOYEE DIRECTOR COMPENSATION....................................................................................................................................39 OWNERSHIP OF POLYONE SHARES.....................................................................................................................................................................41 COMPENSATION DISCUSSION AND ANALYSIS...............................................................................................................................................43 Executive Summary....................................................................................................................................................................................43 Executive Compensation Philosophy and Objectives..................................................................................................................47 What We Pay and Why: Elements of Compensation ..................................................................................................................49 Other Aspects of Our Compensation Programs.............................................................................................................................55 EXECUTIVE COMPENSATION..................................................................................................................................................................................59 2016 Summary Compensation Table .................................................................................................................................................59 2016 Grants of Plan-Based Awards.....................................................................................................................................................62 Outstanding Equity Awards at 2016 Fiscal Year-End.................................................................................................................64 2016 Option Exercises and Stock Vested..........................................................................................................................................67 2016 Pension Benefits...............................................................................................................................................................................67 2016 Nonqualified Deferred Compensation ...................................................................................................................................68 Potential Payments Upon Termination or Change of Control.................................................................................................70 Compensation Committee Interlocks.................................................................................................................................................74 Policy on Related Person Transactions.............................................................................................................................................74 Risk Assessment of the Compensation Programs.........................................................................................................................74 Compensation Committee Report........................................................................................................................................................75 MISCELLANEOUS PROVISIONS...............................................................................................................................................................................76 APPENDIX A...................................................................................................................................................................................................................A-1 APPENDIX B...................................................................................................................................................................................................................B-1 MESSAGE FROM OUR CEO March 31, 2017 Dear Fellow Shareholder: You are cordially invited to attend the PolyOne Corporation Annual Meeting of Shareholders (the “Annual Meeting”), which will be held at 9:00 a.m. on Thursday, May 11, 2017, at PolyOne Corporation’s corporate headquarters located at PolyOne Center, 33587 Walker Road, Avon Lake, Ohio 44012. NOTICE OF 2017 ANNUAL MEETING OF SHAREHOLDERS Thursday, May 11, 2017 9:00 a.m. For inforff mation on the terms and conditions of these incentive programs, see the “What We Pay and Why: Elements of Compensation” section of this proxy statement. 4 PROXY STATEMENT POLYONE CORPORATRR ION PolyOne Center 33587 Walker Road Avon Lake, Ohio 44012 PROXY STATEMENT Dated March 31, 2017 Our Board respectfully requests your proxy for use at the Annual Meeting to be held at PolyOne’s corporate headquarters located at PolyOne Center, 33587 Walker Road, Avon Lake, Ohio 44012 at 9:00 a.m. on Thursday, May 11, 2017, and at any adjournments of that meeting.

i NOTICE OF 2023 ANNUAL MEETING OF SHAREHOLDERS Thursday, May 11, 2023 9:00 a.m. Please carefully review the proxy materials for the Annual Meeting, which will be held virtually via live webcast on Thursday, May 11, 2023 at 9:00 a.m. The Annual Meeting webcast will begin promptly at 9:00 a.m.

hotels, off-shore installations, trains, and ships).

Wulfsohn 69 AVIENT CORPORATION [This page intentionally left blank] [This page intentionally left blank] [This page intentionally left blank] STOCK EXCHANGE LISTING Avient's Common Stock is listed on the New York Stock Exchange, Symbol: AVNT SHAREHOLDER INQUIRIES If you have any questions concerning your account as a shareholder, name or address changes, inquiries regarding stock certificates, or if you need tax information regarding your account, please contact our transfer agent: Equiniti Trust Company 1110 Centre Pointe Curve, Suite 101 Mendota Heights, MN 55120-4100 Phone: 1-855-598-2615 or 1-651-450-4064 www.shareowneronline.com Additional information about Avient, including current and historic copies of Annual Reports on Form 10-K and other reports filed with the Securities and Exchange Commission, is available online at www.avient.com or free of charge from: Investor Relations Avient Corporation 33587 Walker Road Avon Lake, Ohio 44012 Phone: 1-440-930-1000 ANNUAL MEETING The annual meeting of Avient will be held virtually via live webcast at 9:00 a.m.

Additionally, protective cable insulation and jacketing can be made from ECCOH™ Low Smoke and Fume, Non-Halogen Formulation Visit Our Sustainability Site for More Information LEARN MORE Floating Offshore Wind Turbine Mooring Lines The Challenge Construction of large multi-gigawatt floating wind farms benefit from stable winds and are non-visible from the shore.

SHAREHOLDER INQUIRIES If you have any questions concerning your account as a shareholder, name or address changes, inquiries regarding stock certificates, or if you need tax information regarding your account, please contact our transfer agent: Wells Fargo Shareowner Services 1110 Center Point Curve, Suite 101 Mendota Heights, MN 55120-4100 Phone: 1-800-468-9716 www.shareowneronline.com Additional information about PolyOne, including current and historic copies of Form 10-K and other reports filed with the Securities and Exchange Commission, is available online at www.polyone.com or free of charge from: Investor Affairs Administrator PolyOne Corporation 33587 Walker Road Avon Lake, Ohio 44012 Phone: 440-930-1522 ANNUAL MEETING The annual meeting of shareholders of PolyOne Corporation will be held May 15, 2013 at 9:00 a.m. at PolyOne’s Corporate headquarters, 33587 Walker Road, Avon Lake, Ohio.

SHAREHOLDER INQUIRIES If you have any questions concerning your account as a shareholder, name or address changes, inquiries regarding stock certificates, or if you need tax information regarding your account, please contact our transfer agent: Equiniti Trust Company 1110 Centre Pointe Curve, Suite 101 Mendota Heights, MN 55120-4100 Phone: 1-855-598-2815 or 1-651-450-4064 www.shareowneronline.com Additional information about PolyOne, including current and historic copies of Annual Reports on Form 10-K and other reports filed with the Securities and Exchange Commission, is available online at www.polyone.com or free of charge from: Investor Affairs Administrator PolyOne Corporation 33587 Walker Road Avon Lake, Ohio 44012 Phone: 440-930-1000 ANNUAL MEETING The annual meeting of shareholders of PolyOne will be held May 17, 2018 at 9:00 a.m. at PolyOne’s Corporate headquarters, 33587 Walker Road, Avon Lake, Ohio.

SHAREHOLDER INQUIRIES If you have any questions concerning your account as a shareholder, name or address changes, inquiries regarding stock certificates, or if you need tax information regarding your account, please contact our transfer agent: Wells Fargo Shareowner Services 1110 Centre Pointe Curve, Suite 101 Mendota Heights, MN 55120-4100 Phone: 1-855-598-2815 or 1-651-450-4064 www.shareowneronline.com Additional information about PolyOne, including current and historic copies of Annual Reports on Form 10-K and other reports filed with the Securities and Exchange Commission, is available online at www.polyone.com or free of charge from: Investor Affairs Administrator PolyOne Corporation 33587 Walker Road Avon Lake, Ohio 44012 Phone: 440-930-1000 ANNUAL MEETING The annual meeting of shareholders of PolyOne will be held May 11, 2017 at 9:00 a.m. at PolyOne’s Corporate headquarters, 33587 Walker Road, Avon Lake, Ohio.

AVIENT CORPORATION THIS PAGE INTENTIONALLY LEFT BLANK THIS PAGE INTENTIONALLY LEFT BLANK STOCK EXCHANGE LISTING Avient's Common Stock is listed on the New York Stock Exchange, Symbol: AVNT SHAREHOLDER INQUIRIES If you have any questions concerning your account as a shareholder, name or address changes, inquiries regarding stock certificates, or if you need tax information regarding your account, please contact our transfer agent: Equiniti Trust Company 1110 Centre Pointe Curve, Suite 101 Mendota Heights, MN 55120-4100 Phone: 1-855-598-2615 or 1-651-450-4064 www.shareowneronline.com Additional information about Avient, including current and historic copies of Annual Reports on Form 10-K and other reports filed with the Securities and Exchange Commission, is available online at www.avient.com or free of charge from: Investor Relations Avient Corporation 33587 Walker Road Avon Lake, Ohio 44012 Phone: 440-930-1000 ANNUAL MEETING The annual meeting of shareholders of Avient will be held virtually on May 12, 2022 at 9:00 a.m.