General Policy: The Board of Directors of Avient Corporation (the “Company”) has determined, consistent with the Company’s Code of Conduct, that it is the Company’s policy to comply with all applicable federal and state securities laws, including those relating to buying or selling securities of the Company. These guidelines include the requirement that plans only be entered into during a time other than during a blackout period and that they include a waiting period thereafter before the first trade pursuant to the trading plan, the length of which varies depending on whether or not you are a director or officer of the Company. 13. Revised: December 20, 2024 ANNEX A COVERED EMPLOYEES All Directors All Elected Officers All Appointed Officers Assistant Controller Executive Assistants to Covered Employees Corporate Communications/Investor Relations (all levels) Internal Audit VP, Directors, Managers and Staff of Audit (all levels), Tax Managers and Tax Analysts, Staff of Tax (all levels) Directors, Managers and Staff, Mergers and Acquisitions and functional professionals supporting Mergers and Acquisitions (including Legal professionals) All Other Employees (including Finance and IT employees) with access to full quarterly results within the Avient Systems Secretaries and Direct-Reporting Assistants to any Covered Employee Financial and Business Consultants who have undertaken to comply with this policy Revised: December 20, 2024 ANNEX B Please access the PeopleLink home page and search for “pre-clearance” after clicking “My Help” General Counsel: Amy M.

Johnson previously served as Director of Strategic Tax Planning, Leader of the Intellectual Property Program, and Director of Transfer Pricing at Illinois Tool Works Inc., a Fortune 200 global diversified, industrial manufacturer.

Leffler joined PolyOne in 2008 as senior finance manager in Corporate Treasury and was later promoted to finance director, South America, while based in the company's offices in Sao Paulo, Brazil. Swanson Director, Investor Relations PolyOne Corporation +1 440-930-1018 eric.swanson@avient.com

managing director for Swanson, Director, Investor Relations, PolyOne Corporation, +1 440-930-1018, eric.swanson@avient.com; Media Contact: Kyle Rose, Vice President, Corporate Communications, PolyOne Corporation, +1 440-930-3162, kyle.rose@avient.com

MagnaPrint Hybrid Fusion Vibrant White is an exciting, PVC-free addition to the MagnaColours portfolio, offering a curing time that is half as long as the leading competitor’s water-based ink,” said Jake Ojeda, Global Marketing Director and Americas Sales Director, Color, Additives, and Inks at Avient.

Crist joined PolyOne in 2008 as a global commercial director. Rose Director, Corporate Communications PolyOne Corporation +1 440.930.3162 kyle.rose@avient.com

Avient’s management presents the ERM analysis to Avient’s Board of Directors regularly.

Board of Directors

1 AVIENT CORPORATION AUDIT COMMITTEE CHARTER Authority The Board of Directors, by resolution dated August 31, 2000, established the Audit Committee. The Audit Committee may request that any director, officer or employee of the Company, or the Company’s outside counsel or independent auditor, attend a meeting of the Committee or to meet with any members of, or consultants to, the Committee. These are the responsibilities of management and the independent auditor. 3 The Audit Committee must make regular reports to the Board of Directors.

executive director, Swanson, Director, Investor Relations, PolyOne Corporation, +1 440-930-1018, eric.swanson@avient.com; or Media: Kyle G.