A recording of the webcast and the slide presentation will be available at avient.com/investors/events-presentations immediately following the conference call and will be accessible for one year. https://www.avient.com/investors https://edge.media-server.com/mmc/p/uxwr6azx/ https://www.avient.com/investors https://register-conf.media-server.com/register/BI382391ef65ac4be8a89542609691ae56 https://www.avient.com/investors/events-presentations 3 Non-GAAP Financial Measures The Company uses both GAAP (generally accepted accounting principles) and non-GAAP financial measures. The non-GAAP financial measures include organic performance (which excludes the impact of foreign exchange), adjusted EPS, adjusted operating income, adjusted EBITDA, adjusted EBITDA margins, free cash flow and adjusted free cash flow. Three Months Ended June 30, Six Months Ended June 30, Reconciliation to Condensed Consolidated Statements of Income 2025 2024 2025 2024 Sales $ 866.5 $ 849.7 $ 1,693.1 $ 1,678.7 Gross margin - GAAP 277.9 257.6 541.1 535.8 Special items in gross margin (Attachment 3) 3.8 21.6 11.5 22.0 Adjusted gross margin $ 281.7 $ 279.2 $ 552.6 $ 557.8 Adjusted gross margin as a percent of sales 32.5 % 32.9 % 32.6 % 33.2 % Operating income - GAAP 96.1 72.5 96.8 166.5 Special items in operating income (Attachment 3) 7.0 27.2 106.5 33.4 Adjusted operating income $ 103.1 $ 99.7 $ 203.3 $ 199.9 Adjusted operating income as a percent of sales 11.9 % 11.7 % 12.0 % 11.9 % Three Months Ended June 30, Six Months Ended June 30, Reconciliation to EBITDA and Adjusted EBITDA: 2025 2024 2025 2024 Net income - GAAP $ 53.5 $ 33.8 $ 33.6 $ 83.5 Income tax expense 17.4 11.2 10.7 28.0 Interest expense, net 24.7 26.6 51.6 53.2 Depreciation & amortization 46.6 44.9 91.9 89.2 EBITDA $ 142.2 $ 116.5 $ 187.8 $ 253.9 Special items, before tax 7.3 28.1 108.5 34.3 Interest expense included in special items (0.3) (1.0) (2.0) (1.0) Depreciation & amortization included in special items (0.3) (0.3) (0.7) (0.8) Adjusted EBITDA $ 148.9 $ 143.3 $ 293.6 $ 286.4 Adjusted EBITDA as a percent of sales 17.2 % 16.9 % 17.3 % 17.1 % Three Months Ended September 30, 2024 Reconciliation to Condensed Consolidated Statements of Income $ EPS(1) Net income attributable to Avient common shareholders $ 38.2 $ 0.41 Special items, after-tax 6.6 0.07 Amortization expense, after-tax 15.0 0.16 Adjusted net income / EPS $ 59.8 $ 0.65 (1) Per share amounts may not recalculate from figures presented herein due to rounding avient.com/investors avient.com/investors/events-presentations

If any further information beyond included content is needed, feel free to contact us. Manufacturing sites have implemented Integrated Quality System (IQS) software. Do you have integrated quality system software?

The webcast can be viewed at avient.com/investors, or by clicking here: https://edge.media-server.com/mmc/p/edkwvu9r. View original content to download multimedia:https://www.prnewswire.com/news-releases/avient-announces-agreement-to-acquire-dsm-protective-materials-dyneema-and-plans-to-explore-sale-of-distribution-301528666.html Proxy Statement Download

MSC Certificate Place and date: For the issuing office: Shanghai, 12 June 2024 DNV - Business Assurance Building 9, No. 1591 Hongqiao Road, Changning DistrictShanghai China 200336 Zhu Hai Ming Management Representative Lack of fulfilment of conditions as set out in the Certification Agreement may render this Certificate invalid. ACCREDITED UNIT: DNV Business Assurance B.V., Zwolseweg 1, 2994 LB, Barendrecht, Netherlands - TEL: +31(0)102922689. www.dnv.com/assurance MANAGEMENT SYSTEM CERTIFICATE Certificate no.: 462307-2021-AQ-RGC-RvA Initial certification date: 23 June 2021 Valid: 24 June 2024 – 23 June 2027 This is to certify that the management system of Avient China Company Limited No. 188, Quanzhou Road, Zhongxin Suchu High-Tech Industrial Development Park, Chuzhou, Anhui, China has been found to conform to the Quality Management System standard: GB/T 19001-2016 / ISO 9001:2015 This certificate is valid for the following scope: Design and Manufacture of Color Concentrates, Filling Concentrates and Additive Concentrates http://www.dnv.com/assurance

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