Birmingham, Alabama 1. Santa Clara, Mexico 1. Beggs, certify that: 1.

Certification structure: MULTI-SITE Certification Date: 29 SEP 2023 Effective Date: 27 FEB 2025 Expiration Date: 27 SEP 2026 Revision Date: 05 MAR 2025 Dominic Townsend, President Page 1 of 5 Avon Lake Corporate Responsible Care Corporate Support Activities in Sr. Mariana Langiewicza 50, 95- 050 Konstantynow, Poland Avient Corporation - Korachi, Sindh Pakistan Design and Manufacture of Colour and Additive Concentrates, 1-A/1, Sector-20 , 74900 Korachi, Pakistan Avient Corporation Design and Manufacture of colour and additive concentrates, thermoplastic resins and specialty compounds Hohenrhein 1 Lahnstein Rheinland- Pfalz 5612 Germany Avient Corporation Design & Manufacturing of Colour and Additive Concentrates. Ezcabarte calle H Nº3 , 31194 Oricain, Spain Avient Corporation Design and Manufacture of Colorants and Additives for Plastics 700/848 Moo 1,Tambol Phan Thong, Amata City Chonburi Industrial Estate Phan Thong Chonburi 20160, Thailand Via Lainate 26, 20005 Pogliano Milanese, Italy Avient Corporation Manufacture of Masterbatches 329 Tungsten Rd, Strydompark , 2194 Randburg, South Africa PolyOne Polymers India Private Limited Design & Manufacture of Color, Additive Concentrate & Specialty Survey No.344/1-2-3, Rania Works, Sakarda Bhadarwa Road Rania Gujarat 391780 India Avient Corporation Design and Manufacture of Color and Additive Concentrates, Thermoplastic Resins and Specialty Compounds 2nd Industrial City, Al-Kharj Road , 11432 Riyadh, Saudi Arabia Crta.

Get Help Now +1-866-737-2066 Thermoplastic Elastomers: GLS™ Versaflex™

NOTE: On July 1, 2020, PolyOne and Clariant Masterbatches joint together as Avient, a new kind of materials company focused on conquering customer challenges and unlocking the potential for innovation and sustainability around the globe.  Michelle Maniscalco Senior Manager, Marketing Communications Avient Corporation +1 440-930-1988 michelle.maniscalco@avient.com

NOTE: On July 1, 2020, PolyOne and Clariant Masterbatches joined together as Avient, a new kind of materials company focused on conquering customer challenges and unlocking the potential for innovation and sustainability around the globe. Michelle Maniscalco Senior Manager, Marketing Communications Avient Corporation +1 440-930-1988 michelle.maniscalco@avient.com

NOTE: On July 1, 2020, PolyOne and Clariant Masterbatch joined together as Avient, a new kind of materials company focused on conquering customer challenges and unlocking the potential for innovation and sustainability around the globe. Michelle Maniscalco Senior Manager, Marketing Communications Avient Corporation +1 440-930-1988 michelle.maniscalco@avient.com

NeuThane 70A, 40% BaSO4, PolyOne 1% TiO2 Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

PolyOne DB4880B LO ODOR SELF BOND X ET 729-003-1 Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

Roman, Secretary of State of the Government of Puerto Rico, CERTIFY: That on 2020年7月13日, at 08:50 AM, "POLYONE PUERTO RICO, LLC", registry number 365432, performed the following transaction: Name Change Previous Actual POLYONE PUERTO RICO, LLC AVIENT PUERTO RICO, LLC CERTIFICATE OF AMENDMENT Government of Puerto Rico IN WITNESS WHEREOF, the undersigned by virtue of the authority vested by law, hereby issues this certificate and affixes the Great Seal of the Government of Puerto Rico, in the City of San Juan, Puerto Rico, today, 2020年7月13日.

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. GUIDANCE $800 $754 $128 $123 Sales Adjusted EBITDA $0.56 $0.57 Adjusted EPS 9 • Demand impacted by destocking and cautious customer sentiment • Positive net price benefit: o CAI - Pricing flat and raw material deflation o SEM - Pricing flat with unfavorable mix related to healthcare, more than offset with raw material deflation • Cost reductions driven by Clariant synergies and reduced administrative costs Q3 EBITDA BRIDGE ($ millions) CAI: Price / Mix -) Deflation 22) SEM: Price / Mix (6) Deflation 13) Net Price Benefit 29) Cost Reductions 13) Wage Inflation (8) FX 1) Q3 2023 Actual $ 123) Adjusted EBITDA Q3 2022 Pro Forma $ 137) Demand (49) 10 2023 G U I DAN CE Q4 2023 GUIDANCE VS.