July 1, 2021 July 1, 2021 Rose, Vice President, Corporate Communications, Avient Corporation, +1 440-930-3162, kyle.rose@avient.com

September 1, 2022 Sept. 1, 2022 Rose, Vice President, Corporate Communications, Avient Corporation, +1 440-930-3162, kyle.rose@avient.com

MC-61789PP ORANGE Q100-2-1 5YR UV 831397 MC-61790PP ORANGE Q080-2-1 5YR UV 831398 MC-73401PP WHITE W/ 1 YR UV

June 1, 2023 Like other Mevopur formulations, they are manufactured in dedicated ISO 13485 facilities and supported by testing to ISO 10993-1, USP, European Pharmacopeia, and ICH Q3D guidelines. Avient will exhibit at Medtec China 2023 at the Suzhou International Expo Center in Hall C1, Stand V402, on June 1-3, 2023.  

DNU Geon(TM) MNE30-186-1 G903 Geon(TM) MNE31-11-1 LAM ADH Geon(TM) MNE31-21-1 NEUTRAL

Attachment 1 Special items (1) 1)

To participate in the audio-only portion of the call, dial 1-844-835-7433 (domestic) or 1-914-495-8589 (international) and provide conference ID number 4774915. To listen to this recording, dial 1-855-859-2056 (domestic) or 1-404-537-3406 (international) and provide conference ID number 4774915. Rose, Vice President, Corporate Communications, Avient Corporation, +1 440-930-3162, kyle.rose@avient.com

Get Help Now +1-866-737-2066 V-0, V-1, V-2 and 5VA/5VB ratings for more than 200 specific engineering resins

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

Swanson, Director, Investor Relations, PolyOne Corporation, +1 440-930-1018, eric.swanson@avient.com; Media Contact: Kyle Rose, Vice President, Corporate Communications, PolyOne Corporation, +1 440-930-3162, kyle.rose@avient.com