Any translations of this document shall be used for reference only.) 1/2 Certificate of Approval AWARDED TO PolyOne France Tossiat Route de la vavrette, 01250, Tossiat - France IATF USI: LWZS4P Bureau Veritas Certification certify that the Quality Management System of the above organisation has been audited and found to be in accordance with the requirements of IATF 16949 - FIRST EDITION and the applicable customer specific requirements SCOPE Design and manufacturing PERMITTED EXCLUSION(S) None PRODUCT(S) DELIVERED colour with additive concentrates for thermoplastic resins and speciality compounds obtained by mixing and extrusion https://e-cer.bureauveritas.com/68LJQE0ZV0CO6I7YW0YSXOUMV9WWROQPHPI2AOHRRLFFVRAVTFVZGXKWIE3TOWLTTKEWCPQB9UNAPXHH6T0HXOMUEDVYPRPJLEXBBTKQYPBRICYOKY143TECQ5UMHGA3JX Date Of Certification: 11 December 2024 Date Of Expiration: 10 December 2027 IATF Certificate N°: 0558656 Bureau Veritas Certification Certificate No: FR094003 - IATF Revision: 1 For Bureau Veritas Certification Holding, Tour ALTO, 4 place des saisons, 92400 COURBEVOIE – France (The official document is in English.

In addition, OnColor special effects are incorporated into the plastic during part manufacturing, removing the need for secondary processes like painting, eliminating the associated VOC emissions and preventing peel-off issues. APPLICATIONS • Consumer products such as sporting goods, toys, boxes, pet accessories • Packaging bottles, containers and closures • Appliances, electronics and electrical housings • Automotive interior and exterior trim components BENEFITS • Includes a wide range of special effects for increased visual impact and differentiation • Eliminates the need for secondary processing like painting or decorating • Can be combined with performance additives into Smartbatch™ solutions for convenience Copyright © 2024, Avient Corporation.

These diverse formulations can be customized with various additives to meet a broad range of performance requirements. KEY CHARACTERISTICS • Vinyl powders in high performing, versatile formulations • A balance of fusion characteristics and physical properties • Customizable with additives such as heat or light stabilizers, flame retardants or blowing agents • Matched to any color and to varied processing and performance requirements • VBX Series vinyl powders formulated to automotive OEM needs MARKET AND APPLICATIONS CORE™ Vinyl Powder formulations offer endless utility for nearly every consumer market.

In addition, laser absorption levels can be adjusted using our formulation expertise. In addition to PA66, our solutions also can be customized using multiple base resins such as PC and PBT to meet specific customer needs.

In addition, power generation efficiency is enhanced by roughly 10% when water cools photovoltaic panels and cables. In addition, the company’s expertise and Smartbatch anti-UV concentrate extends the manufacturer’s pontoon part’s ability to withstand outdoor exposure.

In addition to the traditional petroleum-based BT218 grade, this portfolio also features a biopolymer alternative that contains 40% bio- derived content to support sustainability and meets the same strict performance requirements. In addition, these material solutions provide a proven, one-step processing solution to support speed to market and manufacturing efficiencies.

In addition, operating income before special items and adjusted EPS are components of various PolyOne annual and long-term employee incentive plans V I S I O N PolyOne Corporation 4 To be the world’s premier provider of specialized polymer materials, services and solutions C O R E V A L U E S P E R S O N A L V A L U E S Honesty IntegrityRespect Specialization Commercial Excellence Operational Excellence Globalization Collaboration ExcellenceInnovation To be the world’s premier provider of specialized polymer materials, services and solutions PolyOne Corporation 5 P O L Y O N E 2 0 1 7 R E V E N U E | $ 3 . 2 B I L L I O N Transportation 18% Industrial 16% Consumer 12% Packaging 11% Healthcare 11% Wire & Cable 9% Appliance 5% United States 59% Europe 14% Asia 10% Latin America 9% Canada 8% PolyOne Distribution 34% Performance Products & Solutions 21% Specialty Engineered Materials 19% Color Additives & Inks 26% Segment End Market Geography Building & Construction 12% Electrical & Electronics 6% 2009 2010 2011 2012 2013 2014 2015 2016* 2017* A D J U S T E D E P S E X P A N S I O N C O N S E C U T I V E Y E A R S PolyOne Corporation 6 8 $0.13 $0.68 $0.82 $1.00 $1.31 $1.80 $1.96 $2.06 $2.21 *Pro Forma for sale of DSS E A R L Y Y E A R S D E F I N E D B Y S P E C I A L T Y M I X I M P R O V E M E N T PolyOne Corporation 7 2% 76% 2005 2017 $5M $280M + 25% + 33% Specialty OI % of Operating Income Consistently Deliver Double Digit Annual EPS Growth *ROIC is defined as TTM adjusted OI after tax divided by the sum of average debt and equity less cash over a 5 quarter period PolyOne Corporation 8 2006 2017 2020 “Where we were” “Where we are” Platinum Vision ROIC* 5.0% 14.0% 15.0% Operating Income % of Sales Color, Additives & Inks 1.7% 15.5% 20%+ Specialty Engineered Materials 1.1% 12.5% 20%+ Performance Products & Solutions 5.5% 10.7% 12-14% Distribution 2.6% 6.3% 6.5-7.5% P R O O F O F P E R F O R M A N C E & P L A T I N U M V I S I O N 531 660130 149 504 607 2014 2017 R&D / Technical Marketing Sales I N V E S T M E N T I N C O M M E R C I A L R E S O U R C E S D R I V I N G G R O W T H PolyOne Corporation 9 Increased commercial headcount Largest organic revenue growth since recession $2.9 $2.9 $3.2 2015 2016 2017 Revenue in billions of $ + 24% + 15% + 20% Total + 10% Organic + 7% Free Cash Flow (In millions) ROIC* PolyOne Corporation 10 $50 $116 $143 $0 $40 $80 $120 $160 $200 2012 2014 2016 2018 10.8% 11.3% 12.9% 14.0% 10.0% 11.0% 12.0% 13.0% 14.0% 15.0% 2012 2014 2016 2017 2020 Platinum Vision $200 - $220 F R E E C A S H F L O W A N D I M P R O V I N G R E T U R N S *ROIC is defined as TTM adjusted OI after tax divided by the sum of average debt and equity less cash over a 5 quarter period 15.0% $767M R E T U R N I N G C A S H T O S H A R E H O L D E R S O V E R $ 9 5 0 M I L L I O N S I N C E 2 0 1 1 PolyOne Corporation 11 $0 $150 $300 $450 $600 $750 2011 2012 2013 2014 2015 2016 2017 $0.16 $0.20 $0.24 $0.32 $0.40 $0.48 $0.58 $0.70 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 3-Year Dividend Plan Cumulative Share Repurchases (In millions) Increasing Annual Dividend Transformational Opportunity for Growth Through M&A Adjacent Opportunity for Growth Through New Product Pipeline Core Customization 3 H O R I Z O N S O F D E V E L O P M E N T PolyOne Corporation 12 Incremental development from existing base of technology New development adjacent to current technology New technology development outside of and with our current base Service adjacent markets and customers Create new markets, target new customer needs Service existing markets and customers Market Technical I N N O V A T I O N Non-Halogen Flame Retardants Barrier Technologies Fiber Colorants Advanced Composites Thermoplastic Elastomers Gordon Composites/ Polystrand – Composites GLS – Thermoplastic Elastomers ColorMatrix – Liquid Color & Additives I N N O V A T I O N P I P E L I N E PolyOne Corporation 13 PrototypeFrame Opportunity Scale-up & Test Market Build Business Case Commercial Launch (since 2015) Phase 1 Phase 2 Phase 3 Phase 4 Phase 5 8 6 8 2 2 36 5 10 13 10 4 6 7 Breakthrough Platform Derivative Number of Projects 33 17 20 15 5 90 Total Addressable Market ($ millions) - - $800 $1,400 $600 $2,800 F L A M E R E T A R D A N T P O L Y M E R S A D V A N C E D C O M P O S I T E S B A R R I E R M A T E R I A L S C O L O R A N T T E C H N O L O G I E S T H E R M O P L A S T I C E L A S T O M E R S A U N I Q U E C U S T O M E R E X P E R I E N C E Industrial Design I Q D E S I G N L A B S PolyOne Corporation 14 Launched in 2014, IQ Design Labs is our in-house industrial design team that focuses on material selection and processing expertise to help with problem solving, enabling our clients to develop higher performance products. Segment highlights COLOR, ADDITIVES & INKS Color, Additives & Inks Specialty Engineered Materials Specialty Engineered Materials Performance Products & Solutions Performance Products & Solutions DISTRIBUTION Target end markets & �application examples Slide Number 26 Slide Number 27 Slide Number 28 Slide Number 29 Slide Number 30 Slide Number 31 Slide Number 32 Slide Number 33 Slide Number 34 Slide Number 35 Slide Number 36 Slide Number 37 Investor Presentation - March 2018 r4.pdf Investor Presentation - March 2018

& Canada EMEA Asia Latin America 64% 36% Specialty Engineered Materials Color Additives and Inks 40% 37% 18% 5% 6% 8% 24% 20% 10% 15% 9% 4% 4% Defense Healthcare Packaging Consumer Building & Construction Industrial Transportation Energy Telecom 4 C R EAT I N G A WO R L D- C L A SS S US TA I NA B L E ORG A N I ZAT I ON 1. 6.5% annualized long term sales growth leveraging sustainable solutions, composites, healthcare and emerging regions 2. In addition, operating income before the effect of special items is a component of Avient’s annual incentive plans and is used in debt covenant computations. Three Months Ended March 31, 2023 Three Months Ended March 31, 2022 Reconciliation to Condensed Consolidated Statements of Income $ EPS $ EPS Net income from continuing operations attributable to Avient shareholders $ 20.8 $ 0.23 $ 64.4 $ 0.70 Special items, after tax 22.3 0.24 6.4 0.07 Amortization expense, after-tax 15.1 0.16 $ 10.8 $ 0.12 Adjusted net income / EPS $ 58.2 $ 0.63 $ 81.6 $ 0.89 Three Months Ended March 31, Reconciliation of Pro Forma Sales 2023 2022 Sales $ 845.7 $ 892.2 APM pro forma adjustments — 94.9 Pro forma sales $ 845.7 $ 987.1 1 Three Months Ended March 31, Reconciliation to EBITDA and Adjusted EBITDA: 2023 2022 Net income from continuing operations – GAAP $ 21.3 $ 64.7 Income tax expense 7.7 20.0 Interest expense, net 28.8 16.9 Depreciation and amortization 50.5 37.6 EBITDA from continuing operations $ 108.3 $ 139.2 Special items, before tax 27.3 6.7 Depreciation and amortization included in special items (1.8) (2.1) Adjusted EBITDA $ 133.8 $ 143.8 Pro forma APM adjustments — 32.0 Pro forma adjusted EBITDA $ 133.8 $ 175.8 Pro forma adjusted EBITDA as a % of sales 15.8 % 17.8 % Three Months Ended March 31, 2023 2022 Sales: Color, Additives and Inks $ 537.0 $ 649.5 Specialty Engineered Materials 309.7 243.1 Corporate (1.0) (0.4) Sales $ 845.7 $ 892.2 Operating income: Color, Additives and Inks $ 65.6 $ 94.5 Specialty Engineered Materials 43.1 38.3 Corporate (51.6) (30.6) Operating income $ 57.1 $ 102.2 Depreciation & amortization: Color, Additives and Inks $ 25.8 $ 26.0 Specialty Engineered Materials 21.2 7.8 Corporate 3.5 3.8 Depreciation & Amortization $ 50.5 $ 37.6 Earnings before interest, taxes, depreciation and amortization (EBITDA): Color, Additives and Inks $ 91.4 $ 120.5 Specialty Engineered Materials 64.3 46.1 Corporate (48.1) (26.8) Other income (expense), net 0.7 (0.6) EBITDA $ 108.3 $ 139.2 2 AVNT June IR Conferences w Non GAAP Recs.pdf AVNT Q1 2023 Earnings Presentation.pdf AVNT Q1 2023 Earnings Presentation 5.2 221pm IR Deck - AVNT-2023.03.31 (002).pdf

D I S T R I B U T I O N ) 18 END-MARKET F OCUS F OR NEW I NNOVATION Semiconductors Robotics Healthcare Interconnected disruptive markets with massive innovation needs 19 APPENDIX Performance Additives 15% Pigments 13% TiO2 11% Dyestuffs 3%Polyethylene 12% Nylon 6% Polypropylene 5% Other Raw Materials 30% Styrenic Block Copolymer 5% ~40% hydrocarbon based (Grey shaded materials are hydrocarbon based, includes portion of “Other Raw Materials”) Non-hydrocarbon based materials 22 • Significant raw material price inflation and tight inventory continued in Q2 2022, although at a slightly lesser rate compared to the prior quarter o For Q2 2022, the average cost of key hydrocarbon based materials was up 15%, roughly the same as the average cost of non- hydrocarbon based materials In addition, operating income before the effect of special items is a component of Avient’s annual and long-term employee incentive plans and is used in debt covenant computations. Three Months Ended June 30, 2022 Three Months Ended June 30, 2021 Reconciliation to Condensed Consolidated Statements of Income $ EPS $ EPS Net income attributable to Avient shareholders $ 84.7 $ 0.92 $ 68.8 $ 0.74 Special items, after tax 5.1 0.06 11.7 0.13 Adjusted net income / EPS - excluding special items 89.8 0.98 80.5 0.87 FX adjustment n/a n/a $ (4.9) $ (0.05) Adjusted net income / EPS - excluding special items, adjusted for FX $ 89.8 $ 0.98 $ 75.6 $ 0.82 Reconciliation to Consolidated Statements of Income Three Months Ended June 30, 2022 2021 Results Results FX Adjustment FX Adjusted Results Sales: Color, Additives and Inks $ 649.1 $ 624.4 $ (35.8) $ 588.6 Specialty Engineered Materials 243.9 240.6 (10.5) 230.1 Distribution 443.2 404.4 (0.2) 404.2 Corporate and eliminations (33.8) (34.2) (1.2) (35.4) Sales $ 1,302.4 $ 1,235.2 $ (47.7) $ 1,187.5 Operating income: Color, Additives and Inks $ 93.6 $ 86.3 $ (5.2) 81.1 Specialty Engineered Materials 36.6 37.3 (1.3) 36.0 Distribution 27.1 23.7 — 23.7 Corporate and eliminations (27.8) (39.2) 0.2 (39.0) Operating income 129.5 108.1 (6.3) 101.8 Special items in operating income 4.3 14.2 — 14.2 Adjusted operating income $ 133.8 $ 122.3 $ (6.3) $ 116.0 1 Three Months Ended June 30, 2022 Reconciliation to Condensed Consolidated Statements of Income GAAP Results Special Items Adjusted Results Operating Income $ 129.5 $ 4.3 $ 133.8 Income before income taxes $ 114.7 $ 3.4 $ 118.1 Income tax expense - GAAP (30.0) — (30.0) Income tax impact of special items — (0.8) (0.8) Tax adjustments — 2.5 2.5 Net income attributable to noncontrolling interests — — — Net income attributable to Avient shareholders $ 84.7 $ 5.1 $ 89.8 EPS $ 0.92 0.06 $ 0.98 Weighted-average diluted shares 92.1 92.1 92.1 Three Months Ended June 30, 2021 Reconciliation to Condensed Consolidated Statements of Income GAAP Results Special Items Adjusted Results Operating Income $ 108.1 $ 14.2 $ 122.3 Income before income taxes $ 89.8 $ 14.2 $ 104.0 Income tax expense - GAAP (20.4) — (20.4) Income tax impact of special items — (3.4) (3.4) Tax adjustments — 0.9 0.9 Net income attributable to noncontrolling interests (0.6) — (0.6) Net income attributable to Avient shareholders $ 68.8 $ 11.7 $ 80.5 EPS $ 0.74 0.13 $ 0.87 Weighted-average diluted shares 92.4 92.4 92.4 Three Months Ended September 30, 2021 Reconciliation to Condensed Consolidated Statements of Income GAAP Results Special Items Adjusted Results Operating income $ 78.7 $ 20.0 $ 98.7 Income from continuing operations before income taxes $ 61.1 $ 19.9 $ 81.0 Income tax expense - GAAP (8.5) — (8.5) Income tax impact of special items — (4.6) (4.6) Tax adjustments — (3.6) (3.6) Net income attributable to noncontrolling interests 0.3 — 0.3 Net income from continuing operations attributable to Avient shareholders $ 52.9 $ 11.7 $ 64.6 Net income / EPS $ 0.57 $ 0.13 $ 0.70 Weighted-average diluted shares 92.2 92.2 92.2 2 Reconciliation of EBITDA by Segment Year Ended December 31, 2021 Operating income: Color, Additives and Inks $ 303.1 Specialty Engineered Materials 132.0 Distribution 93.2 Corporate and eliminations (147.1) Operating income $ 381.2 Items below OI in Corporate: Other income, net $ (1.3) Depreciation & amortization: Color, Additives and Inks $ 105.7 Specialty Engineered Materials 31.7 Distribution 0.8 Corporate and eliminations 7.7 Depreciation & Amortization $ 145.9 EBITDA: Color, Additives and Inks $ 408.8 Specialty Engineered Materials 163.7 Distribution 94.0 Corporate and eliminations (140.7) EBITDA $ 525.8 Three Months Ended June 30, Year Ended December 31, Reconciliation to EBITDA and Adjusted EBITDA: 2022 2021 2021 Net income from continuing operations – GAAP $ 84.7 $ 69.4 $ 230.6 Income tax expense 30.0 20.4 74.0 Interest expense 16.2 19.5 75.3 Depreciation and amortization from continuing operations 36.5 33.8 145.9 EBITDA $ 167.4 $ 143.1 $ 525.8 Special items, before tax 3.4 14.2 57.1 Depreciation and amortization included in special items (1.1) 1.4 (1.7) Adjusted EBITDA $ 169.7 $ 158.7 $ 581.2 3 AVNT Q2 2022 Earnings Presentation - Website v2.pdf AVNT Q2 2022 Earnings Presentation - Website.pdf AVNT Q2 2022 Earnings Presentation - Website AVNT Q2 2022 Earnings Presentation - Website AVNT Q2 2022 Earnings Presentation - Website 7.25 323pm IR Deck - AVNT-2022.06.30.pdf

Consolidated sales expanded for the first time in seven quarters with contributions from both our Color, Additives and Inks, and Specialty Engineered Materials segments. Webcast Details Avient will provide additional details on its 2024 second quarter and 2024 full-year outlook during its webcast scheduled for 8:00 a.m. In addition, operating income before the effect of special items is a component of Avient's annual incentive plans and is used in debt covenant computations.