January 21, 2025 Aug 01, 2025 Jul 10, 2025

In 2025, we will continue this collaboration by having our supplier’s complete compliance and ESG assessments to ensure adherence to standard modern slavery and human trafficking laws. In order to improve our internal processes and bring ColorMatrix in line to the global Avient system a more effective working process for identifying risk and measuring progress through KPI’s is targeted to be implemented through 2025, which will allow us to improve the mitigation and monitoring of risk across our suppliers. On behalf of the Board of Directors for ColorMatrix Europe Limited: Amanda Saal (Director) Signature: Date: 26th June 2025

January 28, 2025 Aug 01, 2025 Jul 10, 2025

Dominic Townsend, President Effective Date: 22 March 2024 Expiration Date: 28 February 2025 Revision Date: 22 March 2024 Avient Corporation - Barbastro Pol. Dominic Townsend, President Effective Date: 22 March 2024 Expiration Date: 28 February 2025 Revision Date: 22 March 2024 Avient Colorants SA Parc Scientifique Fleming, Fond Jean Pâques 1 Louvain-La-Nueve, Walloon Brabant 1348 Belgium Design and Manufacture of Colour and Additive Concentrates, Thermoplastic Resins and Specialty Compounds 65536-116977Certificate No: Page 26 of 53 ABS Quality Evaluations ABS Quality Evaluations, Inc. 1701 City Plaza Drive, Spring, TX 77389, U.S.A. Dominic Townsend, President Effective Date: 22 March 2024 Expiration Date: 28 February 2025 Revision Date: 22 March 2024 Avient Corporation - Suzano, Brasil Av.

PowerPoint Presentation Avient Corporation AVNT FEBRUARY 13, 2025 Fourth quarter and full year 2024 results 2025 financial guidance Copyright © . All Rights Reserved 2025 17 ADJ. EPS - Full year 2025 $2.70 to $2.94 Q1 2025 $0.76 adj.

Governance and Corporate Responsibility Charter Proposed Revisions March 2025 Final and Approved.pdf AVIENT CORPORATION GOVERNANCE AND CORPORATE RESPONSIBILITY COMMITTEE CHARTER Membership The Governance and Corporate Responsibility Committee (the “Committee”) of the Board of Directors (the “Board”) of Avient Corporation (the “Company”) will consist entirely of directors who meet the definition of “independent” as set forth in the Corporate Governance Standards of the New York Stock Exchange. March 14, 2025

in aggregate principal amount of senior notes due 2025 (the "notes") in an offering exempt from the registration requirements of the Securities Act of 1933 (the "Securities Act"). View original content:http://www.prnewswire.com/news-releases/polyone-announces-pricing-of-650-million-5-75-senior-notes-due-2025--301049717.html

ISO 9001:2015 The Quality Management System is applicable to: Certificate No: 31307 Certification Date: 12 October 1995 Effective Date: 20 September 2023 Expiration Date: 07 October 2025 Revision Date: 20 September 2023 Dominic Townsend, President MANUFACTURE AND SUPPLY OF PLASTIC COMPOUNDS, COLOR AND PERFORMANCE ADDITIVES, ENGINEERED THERMOPLASTICS, VINYL RESINS, CUSTOM MIXED PLASTIC MATERIALS, CUSTOM AND COMMODITY COLORANTS FOR PLASTICS, POLYURETHANE SYSTEMS, AND PLASTICIZERS WITH DESIGN AND SAMPLING SUPPORT AT SUWANEE, GA, AND PURCHASING, CUSTOMER SERVICE, LOGISTICS, QUALITY, DESIGN AND SAMPLING SUPPORT AT AVIENT CORPORATE HEADQUARTERS AT AVON LAKE, OH, AND DISTRIBUTION OF RESINS This certificate may be found on the ABS QE Website (www.abs-qe.com). Ezcabarte calle H Nº3 Oricain, Navarra 31194 Spain Facility: Avient Corporation - Tossiat, France 43 Place de la gare Tossiat 01250 France Activity: Design and Manufacture of Color and Additive Concentrates and Specialty Compounds Activity: Design and Manufacture of Color and Additive Concentrates and Specialty Compounds Page 7 of 7 ABS Quality Evaluations Avient Corporation ISO 9001:2015 Certificate Of Conformance ANNEX At Below Facilities: Validity of this certificate may be confirmed at www.abs-qe.com/cert_validation.

Certificate Avient Corporation A B S Q u al ity E va lu at io n s C er tif ic at io n E Certificate Of Conformance This is to certify that the Quality Management System of: Avient Corporation 33587 Walker Road, Building 428 Avon Lake OH 44012 United States has been assessed by ABS Quality Evaluations, Inc. and found to be in conformance with the requirements set forth by: ISO 9001:2015 The Quality Management System is applicable to: Manufacture of plastic compounds, color and performance additives, engineered thermoplastics, vinyl resins, custom mixed plastic materials, custom and commodity colorants for plastics, polyurethane systems, and plasticizers with design and sampling support at Suwanee, GA, and purchasing, customer service, logistics, quality, design and sampling support at PolyOne Corporate Headquarters at Avon Lake, OH, and distribution of resins Certificate No: 31307 Certification Date: 12 OCT 1995 Effective Date: 11 JUL 2024 Expiration Date 07 OCT 2025 Revision Date: 17 JUL 2024 Dominic Townsend, President Copyright as of the Effective Date, ABS Quality Evaluations, Inc. Central No. 200 50200 Toluca Mexico Avient Corporation - Tossiat, France Design and Manufacture of Color and Additive Concentrates and Specialty Compounds , 43 Place de la gare Tossiat - 01250 France Avient Corporation - Vic (Barcelona), Spain Design, development and production of color concentrates and additives for plastic and synthetic fibers Carretera de Vic a Olot,C-153, km 5 08500 Masies de Roda Spain Avient Corporation - Vonore Warehouse Warehouse , 225 Industrial Drive Vonore - TN 37885 United States Avient Corporation - Vonore, TN Manufacture of Colorants for Plastics , 245 Avecor Drive Vonore - TN 37885 United States Avient Corporation- Suwanee, GA Design and Sampling , 2900 Shawnee Industrial Way Suwanee - GA 30024 United States NEU Specialty Engineered Materials, LLC Compound and supply of thermoplastics for the medical device industry , 15 Corporate Drive North Haven - CT 06473 United States PolyOne Polymers India Pvt.

Esto incluye trabajar de una manera responsable que proteja a las comunidades en las que usted opera. • Identifique y gestione los riesgos para la salud humana y el medio ambiente durante el desarrollo, el transporte, el uso y la eliminación de sus productos. Medio ambiente • Asegúrese de que existan sistemas para la manipulación, el almacenamiento, el reciclaje, la reutilización y la gestión seguros de residuos, emisiones atmosféricas y vertidos de aguas residuales. Las comunicaciones externas sobre Avient requieren el consentimiento previo por escrito de Avient. • Informe a Avient de los cambios financieros, económicos y de suministro (incluido el origen o estado de conflicto de los metales 3TG), las regulaciones gubernamentales u otras situaciones de materiales que puedan afectar a las operaciones en curso o a las decisiones operativas, o si la empresa ha sido inhabilitada como contratista gubernamental. • Establezca un sistema de seguridad de la información y de privacidad de datos para proteger la información de Avient, incluida la información de sus clientes y socios, de su divulgación, cambio, destrucción o uso para cualquier fin distinto de la finalidad para la que se proporcionó.