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AT-1000 AS LI NATURAL GEON W1802L NAT 1000. PP FR 8-6 LMS-1000

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of incorporation or organization) 33587 Walker Road, Avon Lake, Ohio 44012 (Address of principal executive offices) (Zip Code) Registrant’s telephone number, including area code (440) 930-1000 Securities registered pursuant to Section 12(b) of the Act: Title of each class Trading Symbol Name of each exchange on which registered Common Shares, par value $.01 per share AVNT New York Stock Exchange Securities registered pursuant to Section 12(g) of the Act: None Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Where You Can Find Additional Information Our principal executive offices are located at 33587 Walker Road, Avon Lake, Ohio 44012, and our telephone number is +1 (440) 930-1000. 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 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 33587 Walker Road Avon Lake, Ohio 44012 Phone: 440-930-1000 ANNUAL MEETING The annual meeting of shareholders of Avient will be held virtually on May 11, 2023 at 9:00 a.m.

of incorporation or organization) 33587 Walker Road, Avon Lake, Ohio 44012 (Address of principal executive offices) (Zip Code) Registrant’s telephone number, including area code (440) 930-1000 Securities registered pursuant to Section 12(b) of the Act: Title of each class Trading Symbol Name of each exchange on which registered Common Shares, par value $.01 per share AVNT New York Stock Exchange Securities registered pursuant to Section 12(g) of the Act: None Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Where You Can Find Additional Information Our principal executive offices are located at 33587 Walker Road, Avon Lake, Ohio 44012, and our telephone number is +1 (440) 930-1000. 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 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 33587 Walker Road Avon Lake, Ohio 44012 Phone: 440-930-1000 ANNUAL MEETING The annual meeting of shareholders of Avient will be held virtually on May 12, 2022 at 9:00 a.m.