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Tianjin, China 66. Management has assessed the effectiveness of Avient’s internal control over financial reporting as of December 31, 2021 and has prepared Management’s Annual Report On Internal Control Over Financial Reporting contained on page 66 of this Annual Report, which concludes that as of December 31, 2021, 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 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.

Patterson Chairman, President and CEO 0% 20% 40% 60% 80% 100% 2005 2010 2015 2021 2022PF(2) % o f A d ju st e d E B IT D A (1 ) (1) Adjusted EBITDA is EBITDA excluding corporate costs and special items (2) Pro forma for the acquisition of Dyneema and divestiture of Distribution Specialty Transformation Commodity JVs Performance Products & Solutions Distribution Specialty Businesses 7% 46% 66% 86% 100% End Market Transformation(1) � �� �� �� �� �� �� 2006 2022PF(2) 2006 2022PF(2) (1) End market revenue as a percent of total (2) Pro forma for the acquisition of Dyneema and divestiture of Distribution Transportation Building & Construction Healthcare Packaging Consumer 57% 19% 58% 22% 14% 43% 9% 10% 8% 10% 4% 24% 20% 8% Defense 6% United States Securities and Exchange Commission Washington, DC 20549 FORM 10-K ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Cota, Colombia 66. 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.

Aland, Finland 66. 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) 66 AVIENT CORPORATION 10.5 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) 10.6 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. 1-16091) 10.7 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) 10.8 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) 10.9 Amendment Agreement No. 5, dated April 11, 2018, 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 June 30, 2018, SEC File No. 1-16091) 10.10 Amendment Agreement No. 6, dated November 9, 2018, 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 November 13, 2018, SEC File No. 1-16091) 10.11 Amendment Agreement No. 7, dated as of August 29, 2022, by and among Avient Corporation, the lenders party thereto and Citibank, N.A., as administrative agent (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K filed on September 1, 2022, SEC File No. 1-16091) 10.12 Amendment Agreement No. 8, dated August 16, 2023, by and among Avient Corporation, the subsidiaries of Avient Corporation party thereto, Citibank, N.A., as administrative agent, Morgan Stanley Bank, N.A., as the Amendment No. 8 Additional Term Lender (as defined in the Term Loan Agreement), ad the other lenders party thereto (incorporated by reference to Exhibit 10.1 to the Company's Current Report on Form 8-K filed on August 17, 2023, SEC File No. 1-16091) 10.13+ Amended and Restated Avient 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. 1-16091) 10.14+ First Amendment to the Avient Supplemental Retirement Benefit Plan (As Amended and Restated Effective January 1, 2014), dated as of March 16, 2016; Amendment No. 2 to the Avient Supplemental Retirement Benefit Plan (As Amended and Restated Effective January 1, 2014), dated as of December 19, 2018; and Amendment No. 3 to the Avient Supplemental Retirement Benefit Plan (As Amended and Restated Effective January 1, 2014), dated as of April 18, 2019 (incorporated by reference to Exhibit 4.5 to the Company's Registration Statement on Form S-8, filed on May 6, 2019, SEC File No. 333-231236) 10.15+ Avient 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) 10.16+ Avient Corporation Deferred Compensation Plan for Non-Employee Directors (As Amended and Restated Effective July 15, 2021) (incorporated by reference to Exhibit 10.1 of the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2021, SEC File No. 1-16091) 10.17+ 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) 10.18+ Form of Management Continuity Agreement for Executive Officers after 2011 (incorporated by reference to Exhibit 10.12 to the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2013, SEC File No. 1-16091) 10.19+** Schedule of Executive Officers and Others with Management Continuity Agreements 10.20+ Avient Supplemental Retirement Benefit Plan (As Amended and Restated Effective January 1, 2014) (incorporated by reference to Exhibit 10.14 to the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2013, SEC file No. 1-16091) 10.21 Assumption of Liabilities and Indemnification Agreement, dated March 1, 1993, amended and restated by Amended and Restated Assumption of Liabilities and Indemnification Agreement, dated April 27, 1993 (incorporated by reference to Exhibit 10.14 to The Geon Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 1996, SEC File No. 1-11804) 10.22+ Executive Severance Plan, as amended and restated effective May 15, 2014 (incorporated by reference to Exhibit 10.1 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2014, SEC File No. 1-16091) 10.23+ Form of Director and Officer Indemnification Agreement (incorporated by reference to Exhibit 10.1 to the Company’s Current Report on Form 8-K filed on July 5, 2006, SEC File No. 1-16091) 10.24+ Form of 2014 Award Agreement under the Avient Corporation 2010 Equity and Performance Incentive Plan, as amended (incorporated by reference to Exhibit 10.2 to the Company’s Quarterly Report on Form 10-Q for the quarter ended June 30, 2014, SEC File No. 1-16091) 10.25+ Form of 2021 Award Agreement under the Avient Corporation 2020 Equity and Incentive Compensation Plan (incorporated by reference to Exhibit 10.25 to the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2020, SEC File No. 1-16091) 67 AVIENT CORPORATION Exhibit No.

Goff 66 2011 Yes M C Neil Green 53 2021 Yes M M William R. Skills/Experience Ab er na th y Fe ar on G of f G re en Je lli so n Li n M in k N ic ol as Pa tt er so n Pr ee te Ve rd ui n W ul fs oh n Financial Knowledge of finance or financial reporting; experience with debt/capital market transactions and/or mergers and acquisitions l l l l l l l l l International Experience doing business internationally or focused on international issues and operations and exposure to markets, economies, and cultures outside the U.S. Director since: 2011 Age: 66 Current Public Company Directorships: • Exxon Mobil Corporation Former Directorships: • Enbridge Inc. • Marathon • MPLX GP, TLGP • Andeavor • DCP Midstream GP, LLC • QEP Midstream Partners, LP • Western Logistics GP LLC 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.

Management has assessed the effectiveness of PolyOne’s internal control over financial reporting as of December 31, 2016 and has prepared Management’s Annual Report On Internal Control Over Financial Reporting contained on page 66 of this Annual Report, which concludes that as of December 31, 2016, PolyOne’s internal control over financial reporting is effective and that no material weaknesses were identified. 9) Included for the first quarter 2015 are employee separation and restructuring costs of $10.6 million. 65POLYONE CORPORATION 66 ITEM 9.

Country/Region Scope 2, location- based Scope 2, market- based Purchased and consumed electricity, heat, Purchased and consumed low-carbon electricity, heat, steam or Avient CDP Climate Change Questionnaire 2021 Tuesday, August 3, 2021 65 (metric tons CO2e) (metric tons CO2e) steam or cooling (MWh) cooling accounted for in Scope 2 market-based approach (MWh) Belgium 1,348 1,195 6,704 335 Brazil 444 444 4,448 0 Canada 334 334 2,530 0 China 21,484 21,484 34,853 0 Czechia 185 36 373 312 Finland 131 346 1,117 0 France 658 516 11,948 0 Germany 8,802 9,812 21,936 5,834 Hungary 644 725 2,537 0 India 5,362 5,362 7,135 0 Italy 6,204 1,063 20,146 17,864 Luxembourg 35 100 222 0 Mexico 1,711 1,711 3,750 0 Netherlands 250 332 598 0 Peru 36 36 182 0 Poland 2,499 2,857 3,523 0 Saudi Arabia 8,214 8,214 15,865 0 Singapore 1,161 1,161 2,984 0 Spain 6,992 9,236 26,952 0 Thailand 4,369 4,369 9,016 0 United Kingdom of Great Britain and Northern Ireland 350 531 1,527 0 United States of America 51,565 5,458 121,433 100,004 Turkey 3,317 3,317 7,119 0 Guatemala 252 252 660 0 Pakistan 1,218 1,218 3,101 0 Argentina 289 212 897 240 South Africa 830 830 927 0 Indonesia 1,111 1,111 1,451 0 Chile 46 46 114 0 Sweden 25 0 1,883 1,883 New Zealand 225 225 2,073 0 Avient CDP Climate Change Questionnaire 2021 Tuesday, August 3, 2021 66 Viet Nam 338 338 743 0 Colombia 375 375 2,338 0 Ireland 350 524 1,057 0 Malaysia 461 461 697 0 Taiwan, Greater China 3,348 3,348 5,991 0 C7.6 (C7.6) Indicate which gross global Scope 2 emissions breakdowns you are able to provide.

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