to stockholders of record on

to stockholders of record on

Avient Announces Record Fourth Quarter and Full Year 2021 Results

Revenue expanded 7% to $814 million, driven by recent commercial investments and record performances in Distribution and Performance Products and S

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RECORD DATE The Board set March 19, 2024 as the record date for the Annual Meeting and owners of record of common shares of Avient as of the close of business on that date are eligible to: • Receive this notice of the Annual Meeting; and • Vote at the Annual Meeting and any adjournments or postponements of the Annual Meeting. Shareholders as of the close of business on March 19, 2024, the record date for the Annual Meeting (the "Record Date"), may attend and participate in the Annual Meeting. VOTING AT THE MEETING Shareholders of record at the close of business on the Record Date, March 19, 2024, are entitled to vote at the Annual Meeting.

A recording of the webcast and the investor presentation will be available at polyone.com/investor. In addition, a recording of the audio will be available for one week, beginning at To listen to this recording, dial 1-855-859-2056 (domestic) or 1-404-537-3406 (international) and provide conference ID number 5289238.