Avient Colorants Sweden AB in Malmoe and Avient Colorants USA LLC in Lewiston, Maine are Medical Centers of Competence with an external ISO 13485 certification.

QE_Cert-Images\QE-Cert-Mark-for-Test.png validitystatement2: ABS Quality Evaluations, Inc. 1701 City Plaza Drive, Spring, TX 77389, U.S.A.

On November 30, 2010, we sold our 50% interest in BayOne, previously part of our Global Color, Additives and Inks, to Bayer MaterialScience LLC. Wulfsohn 69 EXHIBIT INDEX 2.1† Purchase Agreement, dated as of February 28, 2011, by and among PolyOne Corporation, 1997 Chloralkali Venture, LLC, Olin Corporation and Olin SunBelt II, Inc. WALTERS President and Chief Executive Officer, QualHealth, LLC—a healthcare consulting firm.

Operating Partner, Quinpario Partners LLC (a private equity firm specializing in investments in specialty chemical businesses) from September 2012 to June 2013. Wulfsohn POLYONE CORPORATION 83 EXHIBIT INDEX 2.1† Purchase Agreement, dated as of February 28, 2011, by and among PolyOne Corporation, 1997 Chloralkali Venture, LLC, Olin Corporation and Olin SunBelt II, Inc. WALTERS President and Chief Executive Officer, QualHealth, LLC Committees: 2, 4 WILLIAM A.

Avient Colorants Sweden AB in Malmoe and Avient Colorants USA LLC in Lewiston, Maine are Medical Centers of Competence with an external ISO 13485 certification.

Bank Trust Company, National Association as trustee (incorporated by reference to Exhibit 4.1 to the Company's Current Report on Form 8-K filed on August 10, 2022, SEC File No. 1-16091) 4.3 Description of Securities (incorporated by reference to Exhibit 4.2 to the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2019, SEC File No. 1-16091). 10.1 Third Amended and Restated Credit Agreement, dated June 28, 2019, by and among PolyOne Corporation, the subsidiaries of PolyOne Corporation party thereto, Wells Fargo Capital Finance, LLC, as administrative agent, and the various lenders and other agents party thereto (incorporated by reference to Exhibit 10.2 to the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 2019, SEC File No. 1-16091) 10.2 First Amendment to Third Amended and Restated Credit Agreement, dated as of October 26, 2021, by and among the lenders party thereto, Wells Fargo Capital Finance, LLC, as administrative agent for the lenders, Avient Corporation, NEU Specialty Engineered Materials, LLC, Avient Canada ULC, and PolyOne S.à.r.l. incorporated by reference to Exhibit 10.2 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2021, SEC File No. 1-16091) 10.3† Second Amendment to Third Amended and Restated Credit Agreement, dated as of April 3, 2023, by and among the lenders party thereto, Wells Fargo Capital Finance, LLC, as administrative agent for the lenders, Avient Corporation, NEU Specialty Engineered Materials, LLC, Avient Canada ULC, and Avient S.a.r.l. incorporated by reference to Exhibit 10.1 to the Company's Quarterly Report on Form 10-Q for the quarter ended March 31, 2023, SEC File No. 10.4 Credit Agreement, dated November 12, 2015, by and among PolyOne Corporation, as borrower, Citibank, N.A., as administrative agent, each of Citigroup Global Markets Inc., Wells Fargo Securities LLC, Goldman, Sachs & Co., HSBC Securities (USA) Inc. and Morgan Stanley & Co.

Operating Partner, Quinpario Partners LLC (a private equity firm specializing in investments in specialty chemical businesses) from September 2012 to June 2013. Exhibit Description 2.1† Purchase Agreement, dated as of February 28, 2011, by and among PolyOne Corporation, 1997 Chloralkali Venture, LLC, Olin Corporation and Olin SunBelt II, Inc. WALTERS President and Chief Executive Officer, QualHealth, LLC Committees: 2, 4 WILLIAM A.

The ABL Amendment amends the Third Amended and Restated Credit Agreement, dated June 28, 2019, by and among the Company and certain subsidiaries of the Company party thereto, Wells Fargo Capital Finance, LLC, as administrative agent, and the various lenders and other agents party thereto. PlastiComp) on May 31, 2018 and Fiber-Line, LLC (Fiber-Line) on January 2, 2019 involved contingent earnout consideration. The ABL Amendment amends the Third Amended and Restated Credit Agreement, dated June 28, 2019 (the ABL Credit Agreement), by and among the Company and certain subsidiaries of the Company party thereto, Wells Fargo Capital Finance, LLC, as administrative agent, and the various lenders and other agents party thereto.

Director since: 2011 Age: 68 Current Public Company • None Current Non-Public Company • X-Energy Reactor Company, LLC • Engine No. 1 Former Directorships: • Enbridge Inc Marathon Petroleum • MPLX LP • Andeavor Logistics, LP • Andeavor • DCP Midstream GP, LLC • QEP Midstream Partners, LP • Western Logistics GP LLC • Exxon Mobil Corporation PROXY STATEMENT 2025 | Annual Meeting of Shareholders 13 Neil Green Executive Vice President and Chief Digital Officer at Otis Worldwide Corporation (“Otis”), a leading elevator and escalator manufacturing, installation and service company, since 2020. Green served as Vice President, Data Center Group at Intel Corporation, a semiconductor company, and as President, Intel Federal LLC, a subsidiary of Intel Corporation, from 2015 to 2018, and previously in various other roles of increasing responsibility at Intel Corporation.

2012 RedHawk, LLC and Spartech Corporation (Incorporated by reference to Exhibit 2.1 to PolyOne Corporation’s current report on Form 8-K filed on October 24, 2012, SEC File No. 1-16091) 2.2† Asset Purchase Agreement, dated as of March 25, 2013, by and between PolyOne Corporation and Mexichem Specialty Resins Inc. incorporated by reference to Exhibit 2.1 to the Company’s Current Report on Form 8-K filed March 27, 2013, SEC File No. 1-16091) 2.3† Equity Purchase Agreement dated June 29, 2017, by and among PolyOne Corporation, PolyOne Designed Structures and Solutions LLC and NLIN Plastics, LLC (incorporated by reference to Exhibit 2.1 to the Company's Quarterly Report on Form 10-Q for the quarter ended June 30, 2017, SEC File No. 1-16091) 3.1 Articles of Incorporation (incorporated by reference to Exhibit 3(i) to the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2000, SEC File No. 1-16091) 3.2 Amendment to the Second Article of the Articles of Incorporation, as filed with the Ohio Secretary of State, November 25, 2003 (incorporated by reference to Exhibit 3.1a to the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2003, SEC File No. 1-16091) 3.3 Regulations (incorporated by reference to Exhibit 3.1 to the Company’s Current Report on Form 8-K filed on July 17, 2009, SEC File No. 1-16091) 4.1 Indenture, dated February 28, 2013, between PolyOne Corporation and Wells Fargo Bank, National Association, as trustee (incorporated by reference to Exhibit 4.1 to the Company’s Current Report on Form 8-K filed on March 5, 2013, SEC File No. 1-16091) 10.1 Second Amended and Restated Credit Agreement, dated February 24, 2017, by and among PolyOne Corporation, the subsidiaries of PolyOne Corporation party thereto, Wells Fargo Capital Finance, LLC, as administrative agent, and the various lenders and other agents party thereto (incorporated by reference to Exhibit 10.2 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2017, SEC File No. 1-16091) 10.2 Credit Agreement, dated November 12, 2015, by and among PolyOne Corporation, as borrower, Citibank, N.A., as administrative agent, each of Citigroup Global Markets Inc., Wells Fargo Securities LLC, Goldman, Sachs & Co., HSBC Securities (USA) Inc. and Morgan Stanley & Co. LLC, as joint-lead arrangers and joint-book managers, Jefferies Finance LLC, KeyBanc Capital Markets Inc. and SunTrust Robinson Humphrey, Inc., as co-managers, and several other commercial lending institutions that are parties thereto (incorporated by reference to Exhibit 10.6 to the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2015, SEC File No. 1-16091) 10.3 Amendment Agreement No. 1 to the Credit Agreement, dated as of June 15, 2016, among the Company, certain subsidiaries of the Company, Citibank, N.A., as administrative agent, and the additional lender party thereto (incorporated by reference to Exhibit 10.2 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30. 2016, SEC File No. 16091) 10.4 Amendment Agreement No. 2, dated August 3, 2016, by and among PolyOne Corporation, the subsidiaries of PolyOne Corporation party thereto, Citibank, N.A, as administrative agent, and the lenders party thereto (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed on August 5, 2016, SEC File No. 10.5 Amendment Agreement No. 3, dated January 24, 2017, by and among PolyOne Corporation, the subsidiaries of PolyOne Corporation party thereto, Citibank, N.A., as administrative agent, and the lenders party thereto (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2017, SEC File No. 1-16091) 10.6 Amendment Agreement No. 4, dated August 15, 2017, by and among PolyOne Corporation, the subsidiaries of PolyOne Corporation party thereto, Citibank, N.A., as administrative agent, and the lenders party thereto (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2017, SEC File No. 1-16091) 10.7+ Form of 2011 Award Agreement under the 2010 Equity and Performance Incentive Plan (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2011, SEC File No. 10.8+ Amended and Restated PolyOne Corporation 2010 Equity and Performance Incentive Plan (incorporated by reference to Appendix B to the Company’s definitive proxy statement on Schedule 14A filed on April 3, 2015, SEC File No. 10.9+ Amended and Restated PolyOne Senior Executive Annual Incentive Plan (incorporated by reference to Appendix C to the Company’s definitive proxy statement on Schedule 14A filed on April 3, 2015, SEC File No. 1-16091) 10.10 PolyOne 2017 Equity and Incentive Compensation Plan (incorporated by reference to Appendix B to the Company's definitive proxy statement on Schedule 14A filed on March 31, 2017, SEC File No. 1-16091) 10.11+ Form of Grant of Stock-Settled Stock Appreciation Rights under the 2010 Long-Term Incentive Plan (incorporated by reference to Exhibit 10.2 to the Company’s Quarterly Report on Form 10-Q for the quarter ended March 31, 2010, SEC File No. 1-16091) 10.12+ Amended and Restated Deferred Compensation Plan for Non-Employee Directors (as amended and restated effective May 20, 2014) (incorporated by reference to Exhibit 10.7 of the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2014, SEC File No. 1-16091) 10.13+ Form of Management Continuity Agreement for Executive Officers prior to 2011 (incorporated by reference to Exhibit 10.13 to the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2007, SEC File No. 1-16091) POLYONE CORPORATION66 Exhibit No.