September 1, 2022 Investor Relations Contact: Giuseppe (Joe) Di Salvo, Vice President, Treasurer and Investor Relations, Avient Corporation, +1 440-930-1921, giuseppe.disalvo@avient.com; Media Contact: Kyle G. Rose, Vice President, Corporate Communications, Avient Corporation, +1 440-930-3162, kyle.rose@avient.com

UV AMBER T065-1-1 TPX Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

T255-1-2 BLUE T245-1-2 BLUE Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

X ET 172554#SR-11177-1 Smoke Gray 1 Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

MC-22229PE CL2.GRN.1 MC-22230PE CL2.DGN.1 Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

Amosorb SolO2-1 880-4030-1 Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

G-T325-1-2 (CLR ABS) YELLOW 1 Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

INFALLIBLE RED #1 - DARK INFALLIBLE RED #1 - LIGHT Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

BLACK T705-2-1 MM433 BLACK SELF BOND #1 Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

PINK VR-1 VERSOLLAN(TM) OM 1255NX-1 NATURAL Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)