Certificate Avient Corporation S E s 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 Page 1 of 4 S E s ISO 9001:2015 Certificate Of Conformance ANNEX Certificate No.: 31307 Avient Corporation At the below facilities The Manufacture of Pultruded and Filament wound components Pultrusion and CRTM 3943, Valley East Industrial Drive, Buildings 1,2,3,4 Birmingham - AL 35217 United The Manufacture of Pultruded and Filament wound components Pultrusion and Filament Wound Tubing 3968, Valley East Industrial Drive, Building 5 Birmingham - AL 35217 United States The Manufacture of Pultruded and Filament wound components Pultrusion 3950, Valley East Industrial Drive, Building 6 Birmingham - AL 3517 United States Corporation Management of QMS. Purchasing, Customer Service, Logistics, Quality, Design and Sampling; Corporate HQ, Management of QMS 33587, Walker Road, Building 428 Avon Lake - OH 44012 United States Avon Lake, OH (SEM) Manufacture of Engineered Thermoplastics , 554 Moore Road Avon Lake - OH 44012 United States Aland (Odkarby), Finland Manufacture of colorants and compounds for fluoropolymer and high temperature polymers Kroklundsvagen 346 AX-22320 Ödkarby Finland Alicante (Ibi - IQAP), Spain Design, development and production of color concentrates and additives for plastic and synthetic fibers Guadalajara 6, Poligono Industrial L'Alfalç 03440 Ibi Assesse, Belgium (CAI & SEM) "Design of color concentrates, precolors, and compounds for fluoropolymer and high temperature polymers, LSFOH (low smoke and fume, zero halogen compounds), and Specialty Compounds Manufacture of Color and Additive Concentrates and Specialty Compounds" 2 Rue Melville Wilson 5330 Assesse Belgium Barbastro Design and Manufacture of Specialty Engineered Thermoplastics Pol.

Director Farah was one of the original directors during the formation of Swanson, Director, Investor Relations, PolyOne Corporation, +1 440-930-1018, eric.swanson@avient.com; Media Contact: Kyle G.

Sloan has contributed to the company's success and transformation while serving as assistant corporate controller, finance director for PolyOne Distribution, and most recently as finance director for the Designed Structures and Solutions business unit.  including senior manager of Assurance Services, and he later served as director of Accounting Operations at Swanson, Director, Investor Relations, PolyOne Corporation, +1 440-930-1018, eric.swanson@avient.com, Media Contact: Kyle G.

Avient Board of Directors Sincerely, Members of the Governance and Corporate Responsibility Committee, Avient Board of Directors Avient Board of Directors

CLEVELAND, May 14, 2025 /PRNewswire/ -- The Board of Directors of Avient Corporation (NYSE: AVNT), an innovator of materials solutions, has declare Avient Board of Directors Appoints Ashish K. CLEVELAND, Feb. 10, 2025 /PRNewswire/ -- The Board of Directors of Avient Corporation (NYSE: AVNT), an innovator of materials solutions, has declare

Swanson, director, Investor Relations, will present at the Wells Fargo 2015 Industrial and Construction Conference. Media Contact: Kyle Rose Director, Corporate Communications PolyOne Corporation +1 440-930-3162 kyle.rose@avient.com Avient Board of Directors Appoints Ashish K.

CLEVELAND, May 14, 2025 /PRNewswire/ -- The Board of Directors of Avient Corporation (NYSE: AVNT), an innovator of materials solutions, has declare Avient Board of Directors Appoints Ashish K. CLEVELAND, Feb. 10, 2025 /PRNewswire/ -- The Board of Directors of Avient Corporation (NYSE: AVNT), an innovator of materials solutions, has declare

Newlin, who remains executive chairman of the PolyOne Board of Directors. Rose Director, Corporate Communications PolyOne Corporation +1 440-930-3162 kyle.rose@avient.com Avient Board of Directors Appoints Ashish K.

Dodd joined PolyOne from Eastman Chemical Company where she served in strategic marketing roles, including director of downstream engagement and design, as well as director of global chemicals marketing. Rose Director, Corporate Communications PolyOne Corporation +1 440-930-3162 kyle.rose@avient.com Avient Board of Directors Appoints Ashish K.

Franken Managing Director Registration number 1682418.1 Start date certificate 2910112024 Certificate valid until 2910112027 Date of first certificate 2910112009 Certificate for the quality management system according to NENNENNENNEN1111ENENENEN1111ISOISOISOISO 9001:9001:9001:9001:2015201520152015 The certification body TÜV NORD Nederland hereby confirms that the certification 1682418.12910112024 took place in accordance with its certification regulations for the organisations 29101120272910112009 FiberFiberFiberFiber1111Line International B.V.Line International B.V.Line International B.V.Line International B.V.