Culture of Safety At Avient, we maintain a strong commitment to sustainability, by conducting business in a way that puts the safety of our employees and needs of our customers first, while enabling a sustainable world. The Senior Vice President, General Counsel, Secretary and Corporate Ethics Officer, presents the number of ethics reports, report trends, substantiated reports, and a comparison of our ethics data vs. a benchmark to both the Audit and Ethics Committees.

All Rights Reserved 2025 17 NON-HYDROCARBON MATERIALS HYDROCARBON-BASED ~35% of the raw material basket including part of “Other raw materials” are hydrocarbon-based Raw material basket 16% 14% 9% 2% 37% 9% 5% 4% 4% Performance additives Pigments TiO2 Dyestuffs Styrenic block copolymers Polypropylene Nylon Polyethylene Other raw materials Reconciliation of Non-GAAP Financial Measures (Unaudited) (Dollars in millions, except for per share data) Senior management uses comparisons of adjusted net income attributable to Avient common shareholders and diluted adjusted earnings per share (EPS) attributable to Avient common shareholders, excluding special items, to assess performance and facilitate comparability of results.

All Rights Reserved 2025 23 NON-HYDROCARBON MATERIALS HYDROCARBON-BASED ~35% of the raw material basket including part of “Other raw materials” are hydrocarbon-based Raw material basket 16% 14% 9% 2% 37% 9% 5% 4% 4% Performance additives Pigments TiO2 Dyestuffs Styrenic block copolymers Polypropylene Nylon Polyethylene Other raw materials Reconciliation of Non-GAAP Financial Measures (Unaudited) (Dollars in millions, except for per share data) Senior management uses comparisons of adjusted net income from continuing operations attributable to Avient shareholders and diluted adjusted earnings per share (EPS) from continuing operations attributable to Avient shareholders, excluding special items, to assess performance and facilitate comparability of results.

Strong past performance demonstrates that our strategy and execution are workinggy g • Megatrends align with our strengths • Innovation and services provide differentiation and competitive advantage • Strong and proven management team driving growth and performancegrowth and performance The New PolyOne: A Specialty Growth Company $2015 Target: $2.50 Adjusted EPS Page 16 Schedule I Reconciliation of Non-GAAP Financial Measures (Unaudited) (Dollars in millions, except per share data) Below is a reconciliation of non-GAAP financial measures to the most directly comparable measures calculated and presented in accordance with U.S.

Culture of Safety Fiber-Line™ Swellcoat™ Water Blocking Yarns support 5G antennae, data centers, and backbone cable designs to prevent equipment damage and signal attenuation due to water ingression in the cables.

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Overview of how Avient serves wire & cable customers, highlighting both power and data cables technologies Solid and liquid CFA solutions for sheet/profile extrusion CFAs for WPC Sheet and Decking

Static charges that build up on the surface of plastic products can attract dust and dirt, cause sheet and film to cling, and cause stacked products to stick together.   This static build-up can cause the resulting parts, film, or sheet to cling to one another or stick to the mold or tool. Overview of how Avient serves wire & cable customers, highlighting both power and data cables technologies

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