AVIENT CORP

Disclosure controls and procedures

Avient’s management, under the supervision of and with the participation of its Chief Executive Officer and its Chief Financial Officer, has evaluated the effectiveness of the design and operation of Avient’s disclosure controls and procedures, as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as of the end of the period covered by this Quarterly Report. Based upon this evaluation, Avient’s Chief Executive Officer and Chief Financial Officer have concluded that, as of the end of the period covered by this Quarterly Report, its disclosure controls and procedures were effective.

Changes in internal control over financial reporting

There were no changes in Avient’s internal control over financial reporting during the quarter ended September 30, 2025 that materially affected, or are reasonably likely to materially affect, its internal control over financial reporting.

PART II — OTHER INFORMATION

Information regarding certain legal proceedings can be found in Note 10, Commitments and Contingencies, to the accompanying condensed consolidated financial statements and is incorporated by reference herein.