AVIENT CORP

Trading Arrangements

None of the Company's directors or officers (as defined in Rule 16a-1(f) promulgated under the Exchange Act)adopted, modified, orterminated a "Rule 10b5-1 trading arrangement" or a "non-Rule 10b5-1 trading arrangement," as each term is defined in Item 408 of Regulation S-K, during the Company's fiscal quarter ended December 31, 2024.

62 AVIENT CORPORATION

Subsequent Events

In the first quarter of 2025, the Company completed a review of the cloud-based enterprise resource planning system, S/4HANA, including updated project timelines, cost incurred to date, required internal resources and expected costs to complete the initial site implementations, and the evolution of options that could provide better returns for shareholders. As a result of this review, the Company determined it would cease the ongoing development of S/4HANA and re-allocate capital to other projects which will support the Company’s new strategy as noted in Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Business and Key Trends."

As a result of this decision, the Company will recognize a non-cash, pre-tax impairment charge of approximately $71 million, associated with capitalized implementation costs. The Company will also recognize pre-tax charges of approximately $15 million associated with unpaid contractual obligations for hosting fees within its Consolidated Statements of Income in the first quarter of 2025.

Departure of Directors or Certain Officers

On February 21, 2025, Joel R. Rathbun, Senior Vice President, Mergers & Acquisitions, will be leaving the Company. Mr. Rathbun's employment will terminate due to the Company’s strategic direction, which no longer requires this officer position. In connection with the cessation of Mr. Rathbun’s employment with the Company he will receive (in exchange for a release of claims and continued compliance with applicable restrictive covenants) the compensation and benefits that the Company is obligated to provide him under its existing severance arrangements for a termination without cause. Further, in recognition of his contributions to the Company, and in exchange for an extension of Mr. Rathbun’s post-employment non-competition and non-solicitation covenants for an additional year, plus his commitment to provide consulting support, the Compensation Committee of the Board of Directors approved pro-rata continued vesting of his outstanding restricted stock unit awards, in accordance with the other terms of such awards, upon his departure.