S ee S c if ic I s tr u c ti s o n ag e 3. 1 Name (as shown on your income tax return). I am a U.S. citizen or other U.S. person (defined below); and 4. No. 10231X Form W-9 (Rev. 10-2018) AVIENT CORPORATION ✔ 5 D 33587 WALKER ROAD AVON LAKE, OH 44012 3 4 1 7 3 0 4 8 8 7/20/2020

X ST-16319-02-01 Black UV INNER TONE LIGHT V.4 X ST-16151-05-02 Black

X PPH-45G 10-4 Black X ET 311091#SR-32770 MS31 Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

RED HEADER 4 X LB-3612-1B X LB-3612-1A

X ONFORCE PP-40LGF/000 Black X HC72339#SR-00708-00001-F2-4 Green Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

X MF-0000164653#SR-10207 X ET 180376#SR-12074 Blue STEELHEAD SILVER-4

X HC 134080#SR-06357 Black X ET 5200-0002 Tan Conc 4% Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

X TT9200-8708-0 EC Grey X HC-6521-001-4 Natural Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

X MF-39677-02A1-4 Black X MF-39677-02A1-5 Black Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

X 15095-03-4 X GRV-15897-01-2 Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)