In case of a dispute between a data subject and one of the Parties as regards compliance with these Clauses, that Party shall use its best efforts to resolve the issue amicably in a timely fashion. If the meaning of this Addendum is unclear or there is more than one meaning, the meaning which most closely aligns with UK Data Protection Laws applies. 8. The reference to “Clause 12(c)(i)” at Clause 10(b)(i) of Module one, is replaced with “Clause 11(c)(i)”; j.

WHAT WE DO: WE ARE A FORMULATOR CUSTOM FORMULATION 6 N OVE MBE R 2 , 2023 W E BCAS T P RE S E N TAT I O N Complementary technologies and customer relationships offer opportunity to advance commercial strategy Dyneema®, the world’s strongest fiber™, to accelerate growth of sustainable, ultralight and high performance applications AVIENT PROTECTIVE MATERIALS FIRST YEAR 8 Composites comprises over half of Specialty Engineered Materials, compared to 9% in 2016 Proven history of success in areas such as outdoor high performance, defense and sustainable solutions Composites 44% 56% 2023E Sales Collaboration & InnovationComposites as a % of SEM People & Culture Talented, passionate, and creative associates drive continued integration success and allow two cultures to come together as one Avient Lightweight Protective Laminates: PROJECTILE PROTECTION Dyneema® Fiber Solutions Cushioning + Fit + Comfort: LONG-TERM WEAR reSound™ Versaflex™ Thermoplastic Elastomers Strength + Durability + Light-Weighting: SOLID MOUNTING BRACKETS Nymax™ Bergamid™ Complēt™ Engineered Materials Durability + Lubricity: HELMET LATCHES Lubri-One™ Internally Lubricated Polymers Color Consistency and Weatherability CUSTOMIZED SPECIFICATIONS Avient Color and Additive Solutions Antennae Performance FAST, RELIABLE CONNECTIONS PREPERM™ Low-Loss Dielectric Thermoplastics AVIENT PROTECTIVE MATERIALS CROSS SELLING OPPORTUNITIES Wired Connections CONSTANT COMMUNICATION Syncure™ Cross-linkable Wire & Cable Formulations9 10 AVIENT PROTECTIVE MATERIALS CROSS SELLING OPPORTUNITIES 10 Q 3 P E RFO RMAN CE 15.4% 16.3% 2022 PF 2023 Results vs. Avient reflects 2023 adjusted EBITDA guidance of $500M and estimated run-rate CAPEX of $110M. 2023E (%) 27 78 89 83 80 78 74 86 79 76 67 66 55 50 (39) Av ie nt KW R FU L PP G AV Y R PM FM C C E EC L AS H H XL H U N EM N SC L Avient Specialty Formulators Other Specialty / Chemical Companies MULTIPLE EXPANSION Source: Peer data per Bloomberg as of December 29, 2023 Note: Avient reflects 2023 adjusted EBITDA guidance of $500M and closing share price of $41.57. Avient 2011, 2018 and 2021 multiples reflect trailing 12 months EBITDA at December 31. 28 EV / 2023E EBITDA 6.5 8.5 11.0 10.8 16.1 15.5 14.1 14.0 10.3 21.0 19.0 14.3 12.1 11.8 11.7 11.5 9.7 20 11 20 18 20 21 20 23 R PM AV Y PP G KW R FU L EC L H XL SC L C E FM C AS H H U N EM N Avient Historic Multiple Avient Specialty Formulators Other Specialty / Chemical Companies AP P E N DI X 30 Performance Additives 16% Pigments 12% TiO2 10% Dyestuffs 2% Polyethylene 11% Nylon 6% Polypropylene 5% Styrenic Block Copolymer 5% Other Raw Materials 33% ~40% hydrocarbon based (Grey shaded materials are hydrocarbon based, includes portion of “Other Raw Materials”) Non-hydrocarbon based materials 2022 pro forma results for the acquisition of Avient Protective Materials RAW MATERIAL BASKET SEGMENT DATA U.S. & Canada 40% EMEA 37% Asia 18% Latin America 5% 2022 PRO FORMA SEGMENT, END MARKET AND GEOGRAPHY GEOGRAPHY REVENUESEGMENT FINANCIALS Consumer 20% Packaging 24% Industrial 15% Building and Construction 10% Telecommunications 4% Energy 4% Defense 6% END MARKET REVENUE $2,355M $402M $1,300M $272M Sales EBITDA Specialty Engineered Materials Color Additives and Inks $592M$3,653M (1) Transportation 9% Healthcare 8% 32 (1) Total company sales and adjusted EBITDA of $3,653M and $592M, respectively, include intercompany sales eliminations and corporate costs 2022 REVENUE | $2 .4 BILLION US & Canada 34% EMEA 38% Asia 20% Latin America 8% END MARKET REGION 33 Packaging 34% Consumer 21% Healthcare 8% Industrial 15% Transportation 8% Building & Construction 11% Telecommunications 1% Energy 2% COLOR, ADDITIVES & INKS 2022 PRO FORMA REVENUE | $1 .3 BILLION US & Canada 52% EMEA 35% Asia 13% 34 Packaging 5% Consumer 19% Healthcare 8%Industrial 16% Transportation 10% Telecommunications 10% Energy 9% Defense 15% Building & Construction 8% END MARKET REGION SPECIALTY ENGINEERED MATERIALS Packaging 32% Consumer 27% Healthcare 8% Industrial 14% Building & Construction 5% Telecommunications 3% Energy 1% Defense 1% Asia (18% of sales) Transportation 9% 2022 PROFORMA AVIENT REGIONAL SALES Packaging 27% Consumer 14% Healthcare 5% Industrial 17% Building & Construction 10% Energy 5% Defense 8% EMEA (37% of sales)Transportation 11% Packaging 13% Consumer 24% Healthcare 12% Industrial 15% Building & Construction 13% Energy 5% Defense 5% US & Canada (40% of sales) Transportation 7% Packaging 56% Consumer 23% Healthcare 4% Industrial 7% Building & Construction 4% Telecommunications 1% LATAM (5% of sales) Transportation 5% Telecommunications 3% Telecommunications 6% 35 BY END MARKET 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.

Avient Deutschland GmbH (PolyOne Deutschland GmbH) Avient ECCOH High Performance Solutions GmbH (PolyOne Color and Additives Germany GmbH) Bergmann GmbH (PolyOne Th.

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Technical Data Sheets Safety Data Sheets Safety Data Sheets

Technical Data Sheets Safety Data Sheets Safety Data Sheets

Technical Data Sheets Safety Data Sheets Safety Data Sheets

The textile industry is currently one of many major industries under pressure to reduce its environmental impact rapidly,” said Bob Lee, General Manager, Color and Additives Greater China at Avient. Eco Pure® Biodegradation Accelerator: an additive that accelerates the natural biodegradation of commodity types of plastic to meet the US Food and Drug Administration (FDA) and European Union (EU) Food Contact Safety Regulations. Avient Taoyuan site is recognized as bluesign® SYSTEM PARTNER: a well-known accreditation that certifies increased sustainable chemistry and high product safety in the textile industry.

The company maintains its previously communicated full-year adjusted EPS guidance of $3.00, which is an increase of 55% over the prior year adjusted EPS of $1.93. 2 "This has been one of the most challenging years we have experienced as a result of navigating the COVID pandemic and an unprecedented combination of inflation, supply chain disruptions, and labor shortages,” Mr. In addition, a recording of the audio will be available for one week, beginning at 11:00 a.m. Rose Vice President, Corporate 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, 2021 2020 2021 2020 Sales $ 1,219.8 $ 924.5 $ 3,617.3 $ 2,245.1 Operating Income 78.7 33.5 307.2 124.3 Net income from continuing operations attributable to Avient shareholders 52.9 1.7 201.0 57.8 Basic earnings per share from continuing operations attributable to Avient shareholders $ 0.58 $ 0.02 $ 2.20 $ 0.64 Diluted earnings per share from continuing operations attributable to Avient shareholders $ 0.57 $ 0.02 $ 2.18 $ 0.64 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.

At least one member of the Audit Committee shall be an “audit committee financial expert” as defined by the Commission. Discuss with management and the independent auditor the effect of regulatory and accounting initiatives, as well as off-balance-sheet structures on the Company’s financial statements. 6. Review reports to management and the Audit Committee related to on-going assessments of the Company’s risk management processes and system of internal control, including risk oversight related to cyber-security and data protection. 3.