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. Fahrenheitlaan 8Fahrenheitlaan 8Fahrenheitlaan 8Fahrenheitlaan 8 9207 HE9207 HE9207 HE9207 HE Drachten Drachten Drachten Drachten The NetherlandsThe NetherlandsThe NetherlandsThe Netherlands FiberFiberFiberFiber1111Line International B.V.Line International B.V.Line International B.V.Line International B.V. 1B Churnet Park, James Brind1B Churnet Park, James Brind1B Churnet Park, James Brind1B Churnet Park, James Brindley Road Off Macclesfield Roadley Road Off Macclesfield Roadley Road Off Macclesfield Roadley Road Off Macclesfield Road LLLLeekeekeekeek United KingdomUnited KingdomUnited KingdomUnited Kingdom The management system and the application thereof complies with the requirements of the standard.

Franken Managing Director Registration number 1682419.2 Start date certificate 0610312025 Certificate valid until 2810212028 Date of first certificate 2810212019 Previous certificate valid until 2810212025 Date audit 0411212024 – 1211212024 Certificate for the environmental management system according to NENNENNENNEN1111ENENENEN1111ISOISOISOISO 14141414001:001:001:001:2015201520152015 including the current version of the underlying SCCM schemaincluding the current version of the underlying SCCM schemaincluding the current version of the underlying SCCM schemaincluding the current version of the underlying SCCM schema The certification body TÜV NORD Nederland hereby confirms that the certification 1682419.20610312025 took place in accordance with its certification regulations for the organisations 28102120282810212019 FiberFiberFiberFiber1111Line International B.V.Line International B.V.Line International B.V.Line International B.V. Fahrenheitlaan 8Fahrenheitlaan 8Fahrenheitlaan 8Fahrenheitlaan 8 9207 HE Drachten9207 HE Drachten9207 HE Drachten9207 HE Drachten The NetherlandsThe NetherlandsThe NetherlandsThe Netherlands FiberFiberFiberFiber1111Line International B.V.Line International B.V.Line International B.V.Line International B.V. 1B Churnet Park, James Brind1B Churnet Park, James Brind1B Churnet Park, James Brind1B Churnet Park, James Brindley Road Off Macclesfield Roadley Road Off Macclesfield Roadley Road Off Macclesfield Roadley Road Off Macclesfield Road LLLLeekeekeekeek United KingdomUnited KingdomUnited KingdomUnited Kingdom The management system and the application thereof complies with the requirements of the standard.

We enable our innovation strategy through investment in R&D, sales and marketing resources. The metrics that are tracked under the “Planet” metric considers both reduction in waste to landfill intensity (Kg / MT Sales) and energy intensity (MWH / MT Sales). In 2023 our sales of hazardous products accounted for 3.2% of total sales.

ECert.QECertificate Page 1 of 2 Validity of this certificate is based on the successful completion of the periodic surveillance audits of the management system defined by the above scope and is contingent upon prompt,written notification to ABS Quality Evaluations, Inc. of significant changes to the management system or components thereof. ABS Quality Evaluations This is to certify that the Quality Management System of: Avient de México, S.A. de C.V. Activity: Contract review, Customer Services, Information Technologies, Supplier Management Activity: Product Design & Testing

The Board has oversight responsibility of management. The Board delegates to the Chief Executive Officer, and through him or her to other senior management, the authority and responsibility for managing the day-to-day affairs of the Company. Access to Management and Independent Advisors The Board has access to management through Board and Committee meetings where operations and other senior management specified by the Chairman of the Board or Lead Director (as applicable), or the Chief Executive Officer are in regular attendance, and through presentations made by other members of management at those meetings.

Say-Eng Lee Vice President & General Manager, Color, Additives & Inks Asia Say-Eng Lee is vice president and general manager for the Color, Additives & Inks business for the Asia region for Avient Corporation, a premier provider of specialized and sustainable material solutions and services. Lee joined Avient in 2000 as the general manager for the Color, Additives & Inks business for Asia. Lee served in general manager roles at the M.A.

SAY-ENG LEE Vice President & General Manager of Color, Additives & Inks Asia Say-Eng Lee is Vice President and General Manager for the Color, Additives & Inks business for the Asia region for Avient Corporation, an innovator of materials solutions that help customers succeed while enabling a sustainable world. Lee joined Avient in 2000 as the General Manager for the Color, Additives & Inks business for Asia. Lee served in General Manager roles at the M.A.

They are based on management’s expectations that involve a number of business risks and uncertainties, any of which could cause actual results to differ materially from those expressed in or implied by the forward-looking statements. They use words such as “will,” “anticipate,” “estimate,” “expect,” “project,” “intend,” “plan,” “believe,” and other words and terms of similar meaning in connection with any discussion of future operating or financial performance and/or sales. SEGMENT HIGHLIGHTS U.S. & Canada 50% 26% 16% Latin America 2020 SEGMENT, END MARKET AND GEOGRAPHY 29 GEOGRAPHY REVENUESEGMENT FINANCIALS 21%Industrial Building & Electrical & END MARKET REVENUE All data reflects 2020 Pro forma for acquisition of the Clariant Masterbatch business. (1) The total company sales and EBITDA of $3,783M and $457M, respectively, include intercompany sales eliminations and corporate costs $2,043M $331M $709M $124M $1,110M $70M Sales EBITDA Distribution Specialty Engineered Materials Color Additives and Inks $457M$3,783M 35% 14% Building & Electrical & C O L O R , A D D I T I V E S & I N K S 2020 PF REVENUE | $2 .0 BILLION 31% 40% 22% Latin America END MARKET REGION 30 2020 figures Pro forma for acquisition of the Clariant Masterbatch business S P E C I A LT Y E N G I N E E R E D M AT E R I A L S 24% Wire & Cable(1) 24% Electrical & 13% 11% Building & 2020 REVENUE | $709 MILLION END MARKET 58% 19% REGION 31 (1) Approximately 50% of Wire and Cable sales are associated with Fiber Optic Cabling DI S TR IBU T I ON 2020 REVENUE | $1 .1 B ILL ION 29% 25% 20% 14% Electrical & Building & 1% 82% Latin America END MARKET REGION K E Y S U P P L I ER S 32 AMERICAS EMEA ASIA 26% 19% 13% 16% Building & Electrical & 34% 16%Healthcare 17% Building & Electrical & 32% 27% 12% Building & Electrical & 9% 2020 figures Pro forma for acquisition of the Clariant Masterbatch business TOTA L C O M PA N Y R E G I O N A L S A L E S BY END MARKET (58% of sales) (26% of sales) (16% of sales) 33

Yes, Avient has a documented crisis management process. Yes, GMP Program is in place for select sites per required standard(s). 10.0 Quality Management System 10.1 General QMS Does Avient have a documented quality management system? IATF and ISO 13485 managed within ETQ Reliance.

ABS Quality Evaluations Certificate Of Conformance This is to certify that the Quality Management System of: PolyOne España SL Sociedad Unipersonal Pol. Industrial Valle del Cinca s/n Apartado 18 22300 Barbastro, Huesca Spain 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: DEVELOPMENT, PRODUCTION & DISTRIBUTION OF TECHNICAL THERMOPLASTICS. Certificate No: 39033 Certification Date: 01 August 2006 Effective Date: 31 May 2018 Expiration Date: 25 July 2021 Issue Date: 31 May 2018 Alex Weisselberg, President Validity of this certificate is based on the successful completion of the periodic surveillance audits of the management system defined by the above scope and is contingent upon prompt,written notification to ABS Quality Evaluations, Inc. of significant changes to the management system or components thereof.