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Avient developed a Color Simulation Tool to calculate the final color of a PCR-based end article and that can be used to: 1. Plastics Recyclers Europe (PRE) Plastics Recyclers Europe (PRE) is an organization representing the voice of the European plastics recyclers who reprocess plastic waste into high-quality material destined for the production of new articles. Challenge Accepted. 2021 Sustainability Report AVIENT.COM https://www.avient.com http://AVIENT.com https://www.barrons.com/articles/most-sustainable-companies-51644564600 https://www.wsj.com/news/collection/management-top-250-december-2021-30a0ffe8 Message from the CEO Message from the Governance and Corporate Responsibility Committee Our Sustainability Strategy & Employee Engagement Strategy Execution & Proof of Performance 2030 Sustainability Goals Avient Reaffirms Commitment to U.N.

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) 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 Amended and Restated Credit Agreement, dated March 1, 2013, among the Company, PolyOne Canada and certain other subsidiaries of the Company, Wells Fargo Capital Finance, LLC, as administrative agent, Bank of America, N.A. and U.S.

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) 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 as of December 1, 1995, between the Company and NBD Bank, as trustee (incorporated by reference to Exhibit 4.3 to The Geon Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 1996, SEC File No. 1-11804) 4.2 Indenture, dated as of September 24, 2010, between the Company and Wells Fargo Bank, N.A., as Trustee (incorporated by reference to Exhibit 4.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2010, SEC File No. 1-16091) 4.3 First Supplemental Indenture, dated as of September 24, 2010, between the Company and Wells Fargo Bank, N.A., as Trustee (incorporated by reference to Exhibit 4.2 to the Company’s Quarterly Report Form 10-Q for the quarter ended September 30, 2010, SEC File No. 1-16091) 10.1 Credit Agreement, dated as of December 21, 2011, by and among PolyOne Corporation, Bank of America, N.A. as Administrative Agent, the other Lenders party thereto, Wells Fargo Bank, National Association, as Syndication Agent, and Merrill Lynch, Pierce, Fenner & Smith Incorporated and Wells Fargo Securities, LLC, both as Joint-Lead Arrangers and Joint-Book Managers (incorporated by reference to Exhibit 10.1 to the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2011, SEC File No. 1-16091) 10.2 Credit Agreement, dated as of December 21, 2011, by and among PolyOne Corporation, PolyOne Canada Inc. the other subsidiaries of PolyOne Corporation party thereto as borrowers or guarantors, the Lenders party thereto, Wells Fargo Capital Finance, LLC, as Administrative and Collateral Agent, Bank of America, N.A. and U.S.

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.

Avient developed a Color Simulation Tool to calculate the final color of a PCR-based end article and that can be used to: 1. Plastics Recyclers Europe (PRE) Plastics Recyclers Europe (PRE) is an organization representing the voice of the European plastics recyclers who reprocess plastic waste into high-quality material destined for the production of new articles.