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

15:1 L48-1206 TRANS BLUE IN TPU PCR ICY BLUE Q330-5-1 Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

Internal 1 Pack MB-9P E7456 TAN 3602 V-48-1-2 (HIPS) Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

GREY 1749 PMS-1 V4 ZHEA EBONY(SM)FT1002 10:1 VII Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

HC DK TR PURPLE OVERCAP #1 HC DK TR PURPLE OVERCAP #1 Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

PP GREEN ADAPTER W/SLIP 1 CHILLED FACCIA PINK-1 PET Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

TETHER Q390-1-1 LIME PE Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

X HC 127692#SR-33389-1 Natural 0.5% X ET #SR-33853-1 TiO2 Conc Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

RTMB (1% LUMOGEN FK4281) PBlue 15:3 20% (45-008-1) (M) GS Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

ET6000-0006 HI UV Desert Sand 1 ET6000-0006 HI UV Desert Sand 1 CONC 5% Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)