MC-61675PE CL.ORG.4 MC-61714PP ORANGE Q120-2-1 MC-6599PE CL.ORG.1

AVIENT CORPORATION T H I R D Q U A R T E R 2 0 2 3 R E S U L T S (NYSE: AVNT) N OV E M B E R 2 , 2 0 2 3 DISCLAIMER Forward-Looking Statements Certain statements contained in or incorporated by reference into this presentation constitute “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Pro Forma Financial Information The Company acquired Avient Protective Materials (“Dyneema”) on September 1, 2022 (the “Acquisition Date”) and sold the Distribution segment on November 1, 2022. To provide comparable results, the company references “pro forma” financial metrics, which include the business results of Avient Protective Materials for periods prior to the Acquisition Date, as if the transaction occurred on January 1, 2021 and reflect Distribution as a discontinued operation.

MSC Certificate Place and date: For the issuing office: Høvik, 23 January 2025 DNV Product Assurance AS Veritasveien 1, 1363 Høvik, Norway Cecilie Gudesen Torp Management Representative Lack of fulfilment of conditions as set out in the Certification Agreement may render this Certificate invalid. ICP-4-5-i5-ISO13485-f1 rev2 ACCREDITED UNIT: DNV Product Assurance AS, Veritasveien 1, 1363 Høvik, Norway - TEL: +47 67 57 99 00. www.dnv.com MANAGEMENT SYSTEM CERTIFICATE Certificate no.: 240625-2017-AQ-RGC-NA-PS Initial certification date: 14 September 2017 Valid: 08 February 2025 – 07 February 2028 This is to certify that the management system of PolyOne-Shanghai, China 88 Guoshoujing Road, Z.J.Hi-Tech Park, Pudong Shanghai, China (Unicode: 91310000607342402D) has been found to conform to the Quality Management System standard: ISO 13485:2016 This certificate is valid for the following scope: Design, Manufacture, Sales and Distribution of Medical Colour and Additive Concentrates Used for the Plastic Parts of Medical Devices http://www.dnv.com

X ET 84893#SR-01567-00001 White BLUE # 1 T-225-1-3 BLUE # 2 T-215-3-3

X HC-15578-01-3 FL YELLOW 3 ANTIMICROBIAL 1%

PP CONC 4 NATURAL WHITE 275N CONC (25-1) BLACK 145N CONC (25-1) V

MC-34985PP AMARANTH W/1 YR UV MC-34990PP UNION RED W/ 1 YR UV MC-35054PE CL.MRN.4 ROCKWOOD RED 2802

0883-1 RoHS BLACK CARIDIAN Blood bag 1 (Pricing only) CHAMPAGNE LC 4

AMER PEACOCK ULTEM 4 APPLE MOON GRAY 1-123 APPLE MOON GRAY 1-124

BLACK BEAUTY 4-1 HR BLACK BEAUTY -1 HR Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)