You are advised to consult any further disclosures we make on related subjects in our reports on Form 10-Q, 8-K and 10-K that we provide to the Securities and Exchange Commission. Avient does not provide reconciliations of forward-looking non-GAAP financial measures, such as outlook for Adjusted EBITDA and Adjusted Earnings Per Share, to the most comparable GAAP financial measures on a forward-looking basis because Avient is unable to provide a meaningful or accurate calculation or estimation of reconciling items and the information is not available without unreasonable effort. A reconciliation of these measures to their most directly comparable GAAP measures is provided in the tables below.

SHENZHEN, China – April 15, 2025 – Avient Corporation, an innovator of materials solutions, will showcase its portfolio of advanced and sustainable products and services and host three technical seminars at Chinaplas 2025. Additional highlights at the show include various high-temperature colorants and color services, such as: In doing so, we innovate solutions that help our customers overcome their challenges or capitalize on opportunities provided by the fast-changing world and secular trends.

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). Purchasing, Customer Service, Logistics, Quality, Design and Sampling; Corporate HQ, Management of QMS Activity: Manufacture of Engineered Thermoplastics Page 3 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. Purchasing, Customer Service, Logistics, Quality, Design and Sampling; Corporate HQ, Management of QMS 33587, Walker Road, Building 428 Avon Lake - OH 44012 United States Avient Corporation - Avon Lake, OH (SEM) Manufacture of Engineered Thermoplastics , 554 Moore Road Avon Lake - OH 44012 United States Avient Corporation - Aland (Odkarby), Finland Manufacture of colorants and compounds for fluoropolymer and high temperature polymers Kroklundsvagen 346 AX-22320 Ödkarby Finland Avient Corporation - 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 Spain Avient Corporation - 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 Avient Corporation - Barbastro Design and Manufacture of Specialty Engineered Thermoplastics Pol.

Even more importantly, the additive technology met FDA-compliance, so the improved packaging was delivered without any service interruption to the end customer, saving the converter thousands of dollars in packaging redesign efforts, and solidifying the sheet producer’s relationship with their valuable customer.

Buyer shall only use PolyOne’s trademarks, trade names, logos, service marks, trade dress or brand names (“Trademarks”) in connection with the solicitation and sales of Products and in such manner as is specified in advance in writing by PolyOne.

Including the following support activities: PolyOne Design Center (Solution Center) 33567 Walker Road Avon Lake Ohio 44012 USA Audited by ABS QE Customer service, Marketing, Human resources, Logistics, Supplier management, Continuous improvement, Info.

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Avient Corporation Contract Review, Customer Services, Human Resources, Information Technologies, Supplier Management 33587 Walker Road Avon Lake OH 44012 United States TXRMTP Avient Corporation Product Design, Testing 80 North West Street Norwalk OH 44857 United States 626R43 Copyright as of the Effective Date, ABS Quality Evaluations, Inc.

_______________________ Vice President, Accreditation Services For the Accreditation Council Certificate Number 0562.01 Valid to October 31, 2023 0562-01 0562-01c