CASE STUDY: GLS™ THERMOPLASTIC ELASTOMERS WHAT RECOIL? The new material, a GLS™ thermoplastic elastomer (TPE) from Avient, met the rigorous needs of the high-end rifle manufacturer, and then some. After long-term range testing*, the recoil pad continued to reduce recoil and extend durability.

Reconciliation to Adjusted EPS Excluding Special Items and Impacts of February 2020 Equity Offering Three Months Ended March 31, 2020 Net income from continuing operations – GAAP $ 33.1 Special items, after tax (1) 8.6 After tax interest income earned on equity proceeds, included in Interest expense, net (0.7) Adjusted net income excluding special items and impact of interest income on equity proceeds $ 41.0 Diluted weighted-average shares used to compute earnings per common share 86.7 Weighted-average impact of 15.3 million shares issued in February 2020 equity offering (9.3) Diluted weighted-average shares excluding impact of shares issued in February 2020 equity offering 77.4 Adjusted EPS - excluding special items and the net impact of equity offering $ 0.53 Reconciliation of Non-GAAP Financial Measures (Unaudited) (Dollars in millions, except per share data) Senior management uses comparisons of adjusted net income from continuing operations attributable to PolyOne shareholders and diluted adjusted earnings per share (EPS) from continuing operations attributable to PolyOne shareholders, excluding special items, to assess performance and facilitate comparability of results. Avient Corporation 33 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. Adjusted EPS attributable to Avient common shareholders is calculated as follows: 2009* 2010* 2011* 2012* 2013* 2014* 2015* 2016** 2017** 2018 2018*** 2019 Q2 2020 Net income from continuing operations attributable to Avient common shareholders $ 106.7 $ 152.5 $ 153.4 $ 53.3 $ 94.0 $ 78.0 $ 144.6 $ 166.4 $ 173.5 $ 161.1 $ 87.7 $ 75.5 $ 23.0 Joint venture equity earnings, after tax (19.0) (14.7) (3.7) — — — — — — — — — — Special items, before tax(1) (48.7) 24.2 (48.1) 55.1 46.3 164.2 87.6 23.8 32.9 59.5 58.7 61.7 2.4 Special items, tax adjustments(1) (27.2) (96.7) (24.7) (18.9) (13.7) (73.7) (58.7) (15.9) (24.8) (25.3) (25.1) (5.9) 0.2 Adjusted net income from continuing operations attributable to Avient common shareholders $ 11.8 $ 65.3 $ 76.9 $ 89.5 $ 126.6 $ 168.5 $ 173.5 $ 174.3 $ 181.6 $ 195.3 $ 121.3 $ 131.3 $ 25.6 Diluted shares 93.4 96.0 94.3 89.8 96.5 93.5 88.7 84.6 82.1 80.4 80.4 77.7 91.8 Adjusted EPS attributable to Avient common shareholders $ 0.13 $ 0.68 $ 0.82 $ 1.00 $ 1.31 $ 1.80 $ 1.96 $ 2.06 $ 2.21 $ 2.43 $ 1.51 $ 1.69 $ 0.28 * Historical results are shown as presented in prior filings and have not been updated to reflect subsequent changes in accounting principle, discontinued operations or the related resegmentation. ** Pro forma for sale of Designed Structures and Solutions segment (DSS). *** Pro forma for sale of Performance Products and Solutions segment (PP&S).

where he served in various composite product development and engineering roles for high-profile military aircraft programs over a 10-year period.  Pederson later joined Cytec, where he led composite product development for the Chris has distinguished himself through his proven leadership skills, deep technical expertise in composites, and forward-thinking approach to customer service and delivering growth," said

FireCon™ Thermoplastic CPE-A (English) General extrusion guidelines for FireCon™ Thermoplastic CPE-A (English language version) FireCon™ Thermoplastic CPE-A (Spanish)

We continue to generate strong cash flow from operations and are maintaining our full year free cash flow guidance of $180 million. Examples include: • Dyneema®, the world’s strongest fiber™, enables unmatched levels of performance and protection for end-use applications, including ballistic personal protection, marine and sustainable infrastructure and outdoor sports • Unique technologies that improve the recyclability of products and enable recycled content to be incorporated, thus advancing a more circular economy • Light-weighting solutions that replace heavier traditional materials like metal, glass and wood, which can improve fuel efficiency in all modes of transportation and reduce carbon footprint • Sustainable infrastructure solutions that increase energy efficiency, renewable energy, natural resource conservation and fiber optic / 5G network accessibility Avient is certified ACC Responsible Care®, a founding member of the Alliance to End Plastic Waste and certified Great Place to Work®. Rose Vice President, Marketing and Communications Avient Corporation +1 440-930-3162 kyle.rose@avient.com mailto:giuseppe.disalvo@avient.com mailto:kyle.rose@avient.com 7 Attachment 1 Avient Corporation Summary of Condensed Consolidated Statements of Income (Unaudited) (In millions, except per share data) Three Months Ended September 30, Nine Months Ended September 30, 2023 2022 2023 2022 Sales $ 753.7 $ 823.3 $ 2,423.8 $ 2,606.5 Operating Income 34.3 40.6 153.7 242.9 Net income (loss) from continuing operations attributable to Avient shareholders 5.1 (27.4) 48.0 99.8 Basic earnings per share from continuing operations attributable to Avient shareholders $ 0.06 $ (0.30) $ 0.53 $ 1.09 Diluted earnings per share from continuing operations attributable to Avient shareholders $ 0.06 $ (0.30) $ 0.52 $ 1.08 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.

Cap Liners: Thermoplastic elastomers provide exceptional barrier seals while maintaining low torque for easy open characteristics. Regulatory compliance for aqueous, acidic, alcohol and fatty food applications are available with GLS thermoplastic elastomers. Caps, Closures & Containers: Thermoplastic elastomers play a big role in the design of ergonomically enhanced packages that can help aging users accomplish simple tasks such as opening a bottle of aspirin or a jar of coffee.

Versalloy™ Thermoplastic Elastomers A leading North American manufacturer of polypropylene (PP) hose for medical applications, including laser surgery, respiratory care and sleep apnea equipment, faced a challenge with its existing thermoplastic vulcanizate (TPV). Discover more about Versalloy™ Thermoplastic Elastomers

Cap Liners: Thermoplastic elastomers provide exceptional barrier seals while maintaining low torque for easy open characteristics. Regulatory compliance for aqueous, acidic, alcohol and fatty food applications are available with GLS thermoplastic elastomers. Caps, Closures & Containers: Thermoplastic elastomers play a big role in the design of ergonomically enhanced packages that can help aging users accomplish simple tasks such as opening a bottle of aspirin or a jar of coffee.

Avient Debuts New Composite Formulations Virtually at CAMX 2020 CLEVELAND– September 10, 2020 – At the virtual Composites and Advanced Materials Expo (CAMX), Avient Corporation will introduce new enhanced adhes

Processors and converters of flexible thermoplastic film often do an excellent job of meeting the requirements for food protection and attractive marketing. The increased surface energy of the film results in a lower contact angle of the water droplets, allowing adjoining water droplets to merge and eventually spread out into a thin continuous layer of water on the film. These additives are offered globally as a masterbatch or as a component of a specialty formulation, and development has continued to make them even more efficient and easier to add to processing lines.