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

BLUE 1 PURPLE Q250-2-1 Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

GREY-1/ PPRO-1 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)

PEARL SILVER 1 BLUE S-218-1 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)

EU SLIP ADDITIVE 1 OB-1 DISPERSION 2 Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

T705-1-1 TR. Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

POLYETHYLENE 40% 15:1 BLUE STAN-TONE HCC- JETTER #1 Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

DOWNY BLUE 1 DOWNY BLUE 1.B Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)