Each of such adjustments has not yet occurred, are out of the Company's control and/or cannot be reasonably predicted. For the same reasons, the Company is unable to address the probable significance of the unavailable information. The presentation of these measures may be different from non-GAAP financial measures used by other companies.

Avient Corporation’s continued dedication to equal employment opportunity may be re-emphasized and augmented in programs of affirmative action throughout the Company, if and as required by law. It is extremely important that all employees of our Company comply with this policy. You are encouraged to contact your supervisor, your Human Resources representative, or the Corporate Human Resources department if you believe that there has been a violation of this policy, or you can notify the company’s EEO/AA compliance officer at PeopleLink@avient.com.

VERIFICATION OPINION DECLARATION GREENHOUSE GAS EMISSIONS To: The Stakeholders of Avient Corporation Apex Companies, LLC (Apex) was engaged to conduct an independent verification of the greenhouse gas (GHG) emissions reported by Avient Corporation (Avient) for the period stated below. Statement of independence, impartiality and competence Apex is an independent professional services company that specializes in Health, Safety, Social and Environmental management services including assurance with over 30 years history in providing these services. Armstrong-Friberg, Lead Verifier Scott Johnston, Technical Reviewer ESG Senior Program Manager ESG Principal Consultant Apex Companies, LLC Apex Companies, LLC Cleveland, Ohio Doral, Florida August 20, 2025 This verification declaration including the opinion expressed herein, is provided to Avient Corporation and is solely for the benefit of Avient Corporation in accordance with the terms of our agreement.

A full copy of Avient’s Code of Conduct is available in over 20 languages and can be found here: Avient’s Policy on Human Rights can be found here: https://www.avient.com/ https://www.avient.com/company/policies-and-governance-0/code-conduct https://www.avient.com/company/policies-and-governance-0/avients-human-rights-policy Page 2 of 3 Training To mitigate against the risk of non-compliance with our policy, Avient requires all associates to complete mandatory Code of Conduct training. The hotline is operated by an external professional service company and ensures anonymity. Avient currently does not engage in verification of its supply chains to evaluate and address risks of human trafficking and slavery, nor does it currently conduct audits of its suppliers’ compliance with company standards for trafficking and slavery in supply chains.

Each of such adjustments has not yet occurred, are out of the Company's control and/or cannot be reasonably predicted. For the same reasons, the Company is unable to address the probable significance of the unavailable information. To provide comparable financial results, the Company references “pro forma” financial metrics, which include the business results of CMB for periods prior to the Acquisition Date.

The Company highlighted that integration of the Clariant Masterbatch business is continuing to exceed expectations. The Company noted it will provide more details on its 2021 outlook during the webcast scheduled for 9:00 a.m. There will be a question and answer section following the company’s prepared remarks.

B&C COMPANY L I V I N G W A L L P L A N T E R • Non-halogen flame retardant formulation • SBI fire test rating of B-S2-D0 • Good durability and UV stability • Easy to process • Good cost/performance • Provided an optimal balance of fire safety and durability • Improved environmental responsibility for construction application • Supported the appealing design and surface aesthetic Maxxam NHFR Non-Halogen Flame Retardant Polyolefin Formulation KEY REQUIREMENTS WHY AVIENT? All Rights Reserved. https://www.avient.com/products/engineered-polymer-formulations/flame-retardant-formulations/maxxam-fr-flame-retardant-formulations-and-maxxam-nhfr-non-halogen-flame-retardant-formulations Slide 1: B&C company

Pro Forma Financial Information The Company acquired Avient Protective Materials (“Dyneema”) on September 1, 2022 (the “Acquisition Date”) and sold the Distribution segment on November 1, 2022. GUIDANCE (TOTAL COMPANY) 11 $710 $719 Guidance Actual $112 $114 Guidance Actual Sales Adjusted EBITDA (in millions) $0.47 $0.52 Guidance Actual Adjusted EPS (in millions) 13.5% 15.9% 2022 2023 Results vs. The presentation of these measures may be different from non-GAAP financial measures used by other companies.

ECO-CONSCIOUS FLEXIBLE FOAM GUN GRIP SLEEVES HIT THE MARK ECO-CONSCIOUS PLASTISOLS IMPROVE THE FIREARM EXPERIENCE AND MEET GUIDELINES THE CHALLENGE EZR Sport® is an American company specializing in grips for industrial & military manufacturers since 1964. In creating the EZR Gauntlet® System, the company aims to provide custom-fit gun grip sleeves that improve performance and confidence when handling a firearm. THE IMPACT By using Avient’s CORE formulation combined with the proprietary manufacturing process from EZR Sport, the companies created an exceptional foam cell structure, providing excellent shock absorption with a cushioning effect for steady hand placement.

THE SOLUTION The company’s product management team reached out to Avient’s Gordon Composites group to identify an alternative spring solution. Working together to understand the unique requirements for the company’s conveyor application, the engineering team at Avient developed customized flat springs that provide more consistent quality and longer fatigue life than the original components, improving conveyor performance and longevity. THE IMPACT Not only did the Gordon Composites vibratory springs outperform the company’s originally specified spring components, they provided a number of additional benefits: Ready-to-install springs reduced labor and simplified installation Unlike alternative springs, Gordon Composites springs are factory machined to the required size and pre- drilled for a significant reduction in cutting and drilling processes and allowing valuable labor time to be allocated elsewhere.