Registration with the SEC We intend to file a Registration Statement on Form S-8 relating to the issuance of Common Shares under the 2017 Plan with the Securities and Exchange Commission pursuant to the Securities Act of 1933, as amended, as soon as practicable afteff r approval of the 2017 Plan by our shareholders. Richardson’s, Van Hulle’s and Nikrant’s salaries are lower in 2016 than 2015 due to there being one additional pay period in 2015 Executive Contributions FY 2006 – 2015 Registrant Contributions FY 2006 – 2015 R.M.

Validity of this certificate may be confirmed at www.abs-qe.com/cert_validation. For certificates issued in the People's Republic of China information may also be verified on the CNCA website (www.cnca.gov.cn). WITH ADDITIONAL FACILITIES LISTED ON ATTACHED ANNEX) Certificate Of Conformance has been assessed by ABS Quality Evaluations, Inc. and found to be in conformance with the requirements set forth by: Page 2 of 2 ABS Quality Evaluations Avient Corporation ISO 13485:2016 Certificate Of Conformance ANNEX At Below Facilities: Validity of this certificate may be confirmed at www.abs-qe.com/cert_validation.

Validity of this certificate may be confirmed at www.abs-qe.com/cert_validation. ISO 13485:2016 The Quality Management System is applicable to: Certificate No: 54139 Certification Date: 04 September 2019 Effective Date: 29 August 2022 Expiration Date: 01 September 2025 Revision Date: 29 August 2022 Dominic Townsend, President This certificate may be found on the ABS QE Website (www.abs-qe.com). COMPOUND, SUPPLY AND PROTOTYPING SERVICES OF THERMOPLASTICS FOR THE MEDICAL DEVICE INDUSTRY Certificate Of Conformance

Validity of this certificate may be confirmed at www.abs-qe.com/cert_validation. ISO 13485:2016 The Quality Management System is applicable to: Certificate No: 65567 Effective Date: 08 September 2023 Expiration Date: 07 September 2026 Revision Date: 08 September 2023 Dominic Townsend, President This certificate may be found on the ABS QE Website (www.abs-qe.com). MANUFACTURE OF COLORANTS FOR PLASTICS FOR THE MEDICAL DEVICE INDUSTRY Certificate Of Conformance

UltraTuf LED sheet is made using BPA-free Eastman Spectar™ Stratus copolyester, which has received UL GREENGUARD Certification for Indoor Air Quality. PolyOne Corporation, with 2015 revenues of $3.4 billion, is a premier provider of specialized polymer materials, services and solutions.

To find more details about our certifications, visit our ISO Certifications Library. The certification allows all locations on the certification to maintain a Responsible Care® Certification and ISO:14001 certification. In addition to our global certifications, individual sites have obtained additional certification specific to the products and customers they serve.

To find more details about our certifications, visit our ISO Certifications Library. The certification allows all locations on the certification to maintain a Responsible Care® Certification and ISO:14001 certification. In addition to our global certifications, individual sites have obtained additional certification specific to the products and customers they serve.

Disposer des licences, immatriculations et certifications appropriées requises pour mener des activités dans les lieux où vous les exercez Les registres comptables doivent être disponibles sur demande pour Avient

ECert - 2023-09-26T122339.151.pdf Page 1 of 10 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. This is to certify that the Quality Management System of: Avient Corporation - Avon Lake 33587 Walker Road Avon Lake, OH 44012 The Quality Management System is applicable to: Certificate No: 65799 Certification Date: 01 October 2020 Effective Date: 25 September 2023 Expiration Date: 30 September 2026 Revision Date: 26 September 2023 Dominic Townsend, President DESIGN AND MANUFACTURE OF COLOUR AND ADDITIVE CONCENTRATES, THERMOPLASTIC RESINS AND SPECIALTY COMPOUNDS This certificate may be found on the ABS QE Website (www.abs-qe.com). For certificates issued in the People's Republic of China information may also be verified on the CNCA website (www.cnca.gov.cn).

CERTIFICATE Signed for the certification body: Eric Louys Chairman Certification Committee CERTIFICATE EN ISO 50001 : 2018 Energy Management System VINÇOTTE nv Jan Olieslagerslaan 35, 1800 Vilvoorde, Belgium This is to certify that Avient Located at Rue Melville Wilson 2 5330 Assesse Belgium has established and maintains an energy management system according the requirements of EN ISO 50001 : 2018 “Energy Management System” for: Design and manufacture of colour and additive concentrates, thermoplastic resins and speciality compounds This certificate is based on the result of an energy audit documented in the audit report 61231731. Certificate number: 24 EN 47 Valid from 1 February 2024 to 31 January 2027 Further clarifications regarding the scope of this certificate and the applicability of EN ISO 50001 : 2018 requirements may be obtained by consulting the organization. This certificate is granted during the Certification Commission of 1 February 2024 and is subject to the General Regulations of VINÇOTTE nv.