IATF Certificate Place and date: For the issuing office: Katy, TX, 22 May 2025 Revision 10 DNV - Business Assurance 1400 Ravello Drive, Katy, TX, 77449- 5164, USA Sherif Mekkawy Management Representative Lack of fulfilment of conditions as set out in the Certification Agreement may render this Certificate invalid. ACCREDITED UNIT: DNV Business Assurance USA Inc., 1400 Ravello Drive, Katy, TX, 77449-5164, USA - TEL: +1 281-396-1000. www.dnv.com Page 1 of 2 MANAGEMENT SYSTEM CERTIFICATE Certificate no.: 11229-2006-CHN-IATF IATF Certificate No: 0573810 Valid: 21 May 2025 – 20 May 2028 This is to certify that the management system of PolyOne - Suzhou, China EM Sector, 77 Shenggang Street, Suzhou Industrial Park, Suzhou, Jiangsu, China 215024 (USI: CF4943) and, if applicable, the remote supporting locations as mentioned in the Appendix accompanying this Certificate has been found to conform to the Quality Management System standard: IATF 16949:2016 This certificate is valid for the following scope: DESIGN AND MANUFACTURE OF PLASTIC COMPOUNDING MATERIAL EXCLUSION: NONE http://www.dnv.com Certificate no.: 11229-2006-CHN-IATF IATF Certificate No: 0573810 Place and date: Katy, TX, 22 May 2025 Lack of fulfilment of conditions as set out in the Certification Agreement may render this Certificate invalid. ACCREDITED UNIT: DNV Business Assurance USA Inc., 1400 Ravello Drive, Katy, TX, 77449-5164, USA - TEL: +1 281-396-1000. www.dnv.com Page 2 of 2 Appendix to Certificate PolyOne - Suzhou, China Remote Support Locations included in the certification are as follows: Site Name Site Address RSL Activities Certification Body Avient China Co., Ltd.

No Repricing Without Shareholder Approval. Generally, each grant of an award under the Amended 2020 Plan will be evidenced by an award agreement, certificate, resolution or other type or form of writing or other evidence approved by the Committee (an “Evidence of Award”), which will contain such terms and conditions as the Committee may determine, consistent with the Amended 2020 Plan. m) “Evidence of Award” means an agreement, certificate, resolution or other type or form of writing or other evidence approved by the Compensation Committee that sets forth the terms and conditions of the awards granted under this Plan.

Validity of this certificate may be confirmed at www.abs-qe.com/cert_validation. validitystatement1: 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. FACILITY1_LINE4: FACILITY1_LINE5: FACILITY1_LINE6: STANDARD: ISO 13485:2016 MANAGEMENT_TYPE2: The Quality Management System is applicable to: DATE_LABEL_1TF: DATE_VALUE_1TF: DATE_LABEL_2TF: DATE_VALUE_2TF: DATE_LABEL_3TF: Certificate No: DATE_VALUE_3TF: 54139 DATE_LABEL_4TF: Certification Date: DATE_VALUE_4TF: 04 September 2019 DATE_LABEL_5TF: Effective Date: DATE_VALUE_5TF: 01 September 2016 DATE_LABEL_6TF: Expiration Date: DATE_VALUE_6TF: 01 September 2022 DATE_LABEL_7TF: Revision Date: DATE_VALUE_7TF: 04 September 2019 MARK_3: MARK_2: SIGNATURE_NAME: Dominic Townsend, President SIGNATURE_IMAGE: 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 AUDIT_COMPLIANCE: MARK_1: SCOPE_DESCRIPTION: DESIGN, COMPOUND AND SUPPLY OF THERMOPLASTICS FOR THE MEDICAL DEVICE INDUSTRY.

Board of Directors approves a 5 million increase in the number of shares available for share repurchase Board of Directors approved an increase of 5 million shares available for repurchases, bringing the company's total authorization to approximately 6 million shares.

MSC Certificate Place and date: For the issuing office: Shanghai, 12 June 2024 DNV - Business Assurance Building 9, No. 1591 Hongqiao Road, Changning DistrictShanghai China 200336 Zhu Hai Ming Management Representative Lack of fulfilment of conditions as set out in the Certification Agreement may render this Certificate invalid. ACCREDITED UNIT: DNV Business Assurance B.V., Zwolseweg 1, 2994 LB, Barendrecht, Netherlands - TEL: +31(0)102922689. www.dnv.com/assurance MANAGEMENT SYSTEM CERTIFICATE Certificate no.: 462307-2021-AQ-RGC-RvA Initial certification date: 23 June 2021 Valid: 24 June 2024 – 23 June 2027 This is to certify that the management system of Avient China Company Limited No. 188, Quanzhou Road, Zhongxin Suchu High-Tech Industrial Development Park, Chuzhou, Anhui, China has been found to conform to the Quality Management System standard: GB/T 19001-2016 / ISO 9001:2015 This certificate is valid for the following scope: Design and Manufacture of Color Concentrates, Filling Concentrates and Additive Concentrates http://www.dnv.com/assurance

Within the limits of Article 5, Seller warrants good and clear title in goods subject to the sale and that the Product conforms at the time of shipment to a Certificate of Analysis, a Certificate of Compliance, or a Product Specification Sheet, if any such document exists, and other specifications signed by Seller (“Specifications”). Thereafter, Buyer automatically approves the invoice. 9. Buyer shall not (re-) export or (re-) transfer or disclose, directly or indirectly, any of the Products or Items supplied by Seller and/or any Items incorporating or processed from such Products, in breach of any Trade Control laws, or, in the event an export license or other approval is required from any governmental authority or agency, without first obtaining such license or approval.

In deciding on a review or audit, the data exporter may take into account relevant certifications held by the data importer. Entering into this Addendum will have the same effect as signing the Approved EU SCCs and any part of the Approved EU SCCs. In deciding on a review or audit, the data exporter may take into account relevant certifications held by the data importer.

ECert - 2023-09-20T092923.129.pdf Page 1 of 7 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 - HQ 33587 Walker Road 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). For certificates issued in the People's Republic of China information may also be verified on the CNCA website (www.cnca.gov.cn).

Seller warrants good and clear title in goods subject to the sale (“Product”) and that the Product conforms at the time of shipment to a Certificate of Analysis, a Certificate of Compliance, or a Product Specification Sheet, if any such document exists, and other specifications signed by Seller (“Specifications”). Thereafter, Buyer automatically approves the invoice. 7. Buyer shall not (re-) export or (re-) transfer or disclose, directly or indirectly, any of the Products or Items supplied by Seller and/or any Items incorporating or processed from such Products, in breach of any Trade Control Laws, or, in the event an export license or other approval is required from any governmental authority or agency, without first obtaining such license or approval.

IATF Certificate CH-S 证书制作地点及日期: 证书认可签发机构: Katy, TX, 2024年12月 10日 DNV - Business Assurance 1400 Ravello Drive, Katy, TX, 77449-5164, USA Sherif Mekkawy 管理代表 未履行认证协议中规定条款会导致此证书失效，获证组织必须定期接受监督审核并经审核合格此证书方继续有效。