Company: AVNT
Filing Date: 2025-03-27
Form Type: DEF 14A
Source: 0001122976-25-000019
Chunk: 6

Company: AVIENT CORP
Filing Date: 2025-03-27
Form: DEF 14A
Chunk 6
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, you must sign and return your voting instruction card by 11:59 p.m. (ET) on May 12, 2025 to instruct the trustee on how to vote the shares held under the plan. You will not be able to vote shares held in this plan electronically online during the Annual Meeting.

Advance Voting Methods

Even if you plan to attend and participate in our Annual Meeting, please cast your vote as soon as possible using one of the following advance voting methods:

| Visitwww.proxyvote.comto vote your proxyover the internetuntil 11:59 p.m. (ET) on May 13, 2025. 
 Call +1-800-690-6903 to vote your proxyby telephoneuntil 11:59 p.m. (ET) on May 13, 2025.       |
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| Sign, date and return your proxy card and/or voting instruction card to voteby mail.            |

Common shares represented by a properly signed proxy card will be voted in accordance with the choices marked on the card. If no choices are marked, the shares will be voted FOR the: (1) election of twelve Director nominees to our Board; (2) approval, on an advisory basis, of Named Executive Officer compensation; and (3) ratification of the appointment of Ernst & Young LLP ("EY") as our independent registered public accounting firm for the fiscal year ending December 31, 2025.

| Each shareholder’s vote is important. Please submit your vote and proxy by internet or telephone, or complete, sign, date and return your proxy card or voting instruction card. |

<div align='center'>PROXY STATEMENT 2025 | Annual Meeting of Shareholders 2</div>

#### PROXY SUMMARY
Voting During the Annual Meeting

Shareholders may vote their shares electronically online during the Annual Meeting. If you choose to vote your shares online during the Annual Meeting, follow the instructions posted at www.virtualshareholdermeeting.com/AVNT2025 . You will need the 16-digit control number included on your Notice of Internet Availability of Proxy Materials, proxy card and/or voting instruction card. Voting electronically online during the Annual Meeting will replace any previous votes.

Participants in the Avient Retirement Savings Plan will not be able to vote shares held in this plan electronically online during the Annual Meeting.

Questions

Shareholders may submit questions during the Annual Meeting. If you wish to submit a question, you may do so by logging into the virtual meeting platform at www.virtualshare