X MF-15699-001-2 Natural X MF-15699-001-3 Natural X MF-15699-001-4 Natural

Annual Repor t | 2024 2 STOCK EXCHANGE LISTING Avient's Common Stock is listed on the New York Stock Exchange, Symbol: AVNT SHAREHOLDER INQUIRIES If you have any questions concerning your account as a shareholder, name or address changes, inquiries regarding stock certificates, or if you need tax information regarding your account, please contact our transfer agent: Equiniti Trust Company, LLC 1110 Centre Pointe Curve, Suite 101 Mendota Heights, MN 55120-4100 Phone: 1-855-598-2615 or 1-651-450-4064 www.shareowneronline.com Additional information about Avient, including current and historic copies of Annual Reports on Form 10-K and other reports filed with the Securities and Exchange Commission, is available online at www.avient.com or free of charge from: Investor Relations Avient Corporation 33587 Walker Road Avon Lake, Ohio 44012 Phone: 1-440-930-1000 ANNUAL MEETING The annual meeting of Avient will be held virtually via live webcast at 9:00 a.m. Senior management believes these measures are useful to investors because they allow for comparison to Avient's performance in prior periods without the effect of items that, by their nature, tend to obscure Avient's operating results due to the potential variability across periods based on timing, frequency and magnitude. Johnson Vice President, Ta x Holger Kronimus Vice President, Europe, General Manager, Engineered Materials , Europe M.

X MF-15438-001 Natural X TR-16013-002-3 Natural X TR-16013-002-1 Natural

X ET-6790-005-1 Natural X ET-6790-005-5 Natural X ET-6790-005-2 Natural

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 7899765.  To access, dial 1-855-859-2056 (domestic) or 1-404-537-3406 (international) and provide conference ID number 7899765. Sustainable infrastructure solutions that increase energy efficiency, renewable energy, natural resource conservation and fiber optic / 5G network accessibility

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 3155064.  To access, dial 1-855-859-2056 (domestic) or 1-404-537-3406 (international) and provide conference ID number 3155064. Sustainable infrastructure solutions that increase energy efficiency, renewable energy, natural resource conservation and fiber optic / 5G network accessibility

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 2171339.  To access, dial 1-855-859-2056 (domestic) or 1-404-537-3406 (international) and provide conference ID number 2171339. Sustainable infrastructure solutions that increase energy efficiency, renewable energy, natural resource conservation and fiber optic / 5G network accessibility

Clay Aquamix 186 65 Partitioning agent or filler for natural or synthetic waterborne polymers. Rutile Titanium Aquamix 124 60 White colorant and fi ller for natural and synthetic polymers. Rutile Titanium Aquamix 124 60 White colorant and fi ller for natural and synthetic polymers.

X HC #SR-28060-2 Natural X NM 221679#SR-28042-1 Natural X NM #SR-28175-1 Natural

X NM-15648-001-2 Natural X NM-15648-001-6 Natural X NM-15648-001-8 Natural