Avient Corporation Corporate Governance Guidelines The Board of Directors (the “Board”) of Avient Corporation (the “Company”) has adopted the following Corporate Governance Guidelines (the “Guidelines”). The effectiveness and contributions of individual directors are also evaluated and are considered each time a director stands for re-nomination. March 6, 2024 Avient Corporation Corporate Governance Guidelines 1.

WITH ADDITIONAL FACILITIES LISTED ON THE ATTACHED ANNEX) has been assessed by ABS Quality Evaluations, Inc. and found to be in conformance with the requirements set forth by: RCMS®:2013 (Option 2) The Environment, Health, Safety and Security Management System is applicable to: Design and Manufacture of Plastic Compounds Certificate No: 55543 Effective Date 21 December 2017 ABS Quality Evaluations, Inc. 16855 Northchase Drive, Houston, TX 77060, U.S.A.

To enhance its ability to more accurately predict part performance, Avient worked with Hexagon’s Digimat platform. Long fibre reinforced materials have an added degree of modelling complexity due to the need to capture the effects of bundling, fibre entanglement and weld lines. Avient and Hexagon used Digimat to develop anisotropic long fibre material data for a molded connector rod.