It is the responsibility of each person at Avient, including contractors, suppliers, and visitors, to follow all security procedures, to remain aware of and report all possible security threats, to remain committed to working in a secure and safe manner, and to be prepared to respond to emergencies safely and effectively. Bob Patterson Chairman, President, and CEO August 1, 2020

The company reported first quarter sales of $829.0 million compared to $845.7 million in the prior year quarter. First quarter GAAP earnings per share (EPS) from continuing operations was $0.54 compared to $0.23 in the prior year quarter. https://www.avient.com/news-events https://www.avient.com/ 4 Forward-looking Statements In this press release, statements that are not reported financial results or other historical information are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995.

reporting  companies  that   manufacture  products  (or  have  others  manufacture  products)  that  contain  3TG  metals  or  their  derivatives   (tantalum,  tin,  tungsten  and  gold)  that  are  necessary  to  product  functionality  or  production  are  required  to  assess   their  supply  chains  and  report  to  the  SEC  on  whether  those  materials  are  sourced  from  the  Democratic  Republic  of   Congo  and  adjoining  countries.       We  expect  our  global  supply  chain  partners  to  do  the  same,  whether  or  not  they  are  subject  to  the   reporting  requirements  of  the  Act.             Avient  is  equally  committed  to  complying  with  the  reporting  obligations  under  Section  1502  of  the  Act  and  the   related  rule  issued  by  the  SEC.    

CERTIFICATE Signed for the certification body: Eric Louys Chairman Certification Committee CERTIFICATE EN ISO 50001 : 2018 Energy Management System VINÇOTTE nv Jan Olieslagerslaan 35, 1800 Vilvoorde, Belgium This is to certify that Avient Located at Rue Melville Wilson 2 5330 Assesse Belgium has established and maintains an energy management system according the requirements of EN ISO 50001 : 2018 “Energy Management System” for: Design and manufacture of colour and additive concentrates, thermoplastic resins and speciality compounds This certificate is based on the result of an energy audit documented in the audit report 61231731. Certificate number: 24 EN 47 Valid from 1 February 2024 to 31 January 2027 Further clarifications regarding the scope of this certificate and the applicability of EN ISO 50001 : 2018 requirements may be obtained by consulting the organization.

2023 Sustainability Report View and download our 2023 Sustainability Report

The ethics hotline is available globally to make a web-based or telephonic report, with multi-language capabilities, 24 hours a day, seven days a week. When you report using the hotline, you will not be asked to identify yourself and you may remain anonymous.

PolyOne Corporation Investor Day 2012 PolyOne Investor Presentation Credit Suisse Boston Basic Materials Conference June 26, 2013 • In this presentation, statements that are not reported financial results or other historical information are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. You are advised to consult any further disclosures we make on related subjects in our reports on Form 10-Q, 8-K and 10-K that we provide to the Securities and Exchange Commission. The non-GAAP financial measures include: adjusted EPS, earnings before interest, tax, depreciation and amortization (EBITDA), adjusted EBITDA, net debt, Specialty platform operating income, Specialty platform gross margin percentage, adjusted operating income, return on invested capital, net debt/ EBITDA, and the exclusion of corporate charges in certain calculations.

PolyOne Corporation Investor Day 2012 PolyOne Investor Presentation Deutsche Bank 2013 Global Industrials and Basic Materials Conference June 12, 2013 • In this presentation, statements that are not reported financial results or other historical information are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. You are advised to consult any further disclosures we make on related subjects in our reports on Form 10-Q, 8-K and 10-K that we provide to the Securities and Exchange Commission. The non-GAAP financial measures include: adjusted EPS, earnings before interest, tax, depreciation and amortization (EBITDA), adjusted EBITDA, net debt, Specialty platform operating income, Specialty platform gross margin percentage, adjusted operating income, return on invested capital, net debt/ EBITDA, and the exclusion of corporate charges in certain calculations.

January 16, 2024 CLEVELAND – January 16, 2024 – Dyneema®, owned by Avient Corporation, a leading provider of specialty and sustainable material solutions, today announces the launch of a new website and brand identity for the world’s strongest fiber™.

January 20, 2025 CLEVELAND – January 20, 2025 – Dyneema®, owned by Avient Corporation (NYSE: AVNT), an innovator of materials solutions, unveils its most advanced ballistic materials to date with the launch of Dyneema® HB330 and Dyneema® HB332.