For and on behalf of BSI: Carlos Pitanga, Chief Operating Officer Assurance – Americas Certification Date: 2018-07-11 Latest Issue: 2018-07-11 Expiry Date: 2021-07-10 BSI Certificate Number: 85585 IATF Number: 0315491 Page: 1 of 2 This certificate remains the property of BSI and shall be returned immediately upon request. https://pgplus.bsigroup.com/CertificateValidation/CertificateValidator.aspx? https://pgplus.bsigroup.com/CertificateValidation/CertificateValidator.aspx?

The company noted that first quarter 2025 GAAP EPS includes special items of $0.82 primarily related to an impairment associated with ceasing the development of S/4HANA, a cloud-based ERP system (see attachment 3), and $0.16 of intangible amortization expense (see attachment 1). https://www.avient.com/investors https://edge.media-server.com/mmc/p/tay7mbuw/ https://www.avient.com/investors https://register-conf.media-server.com/register/BI648915d05d0c44c4bdef681472840ace 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. Rose Vice President, Corporate Communications Avient Corporation +1 440-930-3162 kyle.rose@avient.com 6 Attachment 1 Avient Corporation Reconciliation of Adjusted Net Income and Earnings Per Share (Unaudited) (In millions, except 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.

https://www.avient.com/products/polymer-additives/uv-and-light-blocking-additives/cesa-light-additives Slide 1: PP NONWOVEN MANUFACTURER

Provided excellent dispersion with highly concentrated TiO2 • Offered customized solutions to achieve customer request on TiO2 % @ 80% • Maintained good light fastness https://www.avient.com/products/polymer-colorants Slide 1: EXTRUSION FILM MANUFACTURER

CABLE MANUFACTURER A E R I A L D R O P C A B L E J A C K E T • Pass clamp test requested by end user • Strong UV resistance & mechanical performance • Excellent processing • Good fire performance to pass CPR class Cca / Dca • Low shrinkage (< 1%) • Exceeded material fire performance requirements and met all other performance criteria • Simplified supply chain with local manufacture in Europe • Enabled customer to run material at optimum processing conditions by providing support with machine set up. https://www.avient.com/products/engineered-polymer-formulations/eco-conscious-formulations/eccoh-low-smoke-and-fume-non-halogen-formulations Cable manufacturer

CABLE MANUFACTURER A E R I A L D R O P C A B L E J A C K E T • Pass clamp test requested by end customer • Strong UV resistance & mechanical performance • Excellent processing • Good fire performance to pass CPR class Cca / Dca • Low shrinkage (< 1%) • Exceeded material fire performance requirements and met all other performance criteria • Simplified supply chain with local manufacture in Europe • Enabled customer to run material at optimum processing conditions by providing support with machine set up ECCOH™ 5978 UV Formulation KEY REQUIREMENTS WHY AVIENT? https://www.avient.com/products/engineered-polymer-formulations/eco-conscious-formulations/eccoh-low-smoke-and-fume-non-halogen-formulations Cable manufacturer

https://www.avient.com/products/polymer-colorants/healthcare-colorants/mevopur-healthcare-colorants-and-formulations Slide 1: Medical textile manufacturer

AVIENT SOLUTION ELECTRICAL CONDUCTIVITY Avient Corporation 1 LEARN MORE https://www.avient.com/products/engineered-polymer-formulations/conductive-signal-radiation-shielding-formulations/stat-tech-static-dissipative-electrically-conductive-formulations

AVIENT SOLUTION IR TRANSMISSION LEARN MORE Avient Corporation 1 https://www.avient.com/products/engineered-polymer-formulations/general-engineered-formulations/edgetek-abs-pc-pc/abs-formulations

Excelite OnePager Putty Knife PUTTY KNIFE MANUFACTURER N O R T H A M E R I C A • Reduce current scrap rate of 30% • Eliminate prominent sink marks • Minimize random short shots • Reduced scrap rate to 1% • Eliminated sink marks • Improved mold fill • Improvement in cell structure increased cell density and dimensional stability during critical cooling time Excelite™ IM Chemical Foaming Additives KEY REQUIREMENTS* WHY AVIENT? https://www.avient.com/products/polymer-additives/foaming-agents/colormatrix-excelite-chemical-foaming-additives