KEY CHARACTERISTICS • Manufactured at four ISO 13485 certified sites, providing global consistency and increased security of supply • Documented change control beyond CAS number level, reducing risk of change • Non-phthalate and formulated without animal-derived substances • Different tones of amber available on request —more or less red or yellow and/or lighter or darker • Also available in liquid form REGULATORY SUPPORT • Pre-tested raw materials: - ISO 10993-1 and USP parts (Class VI) - European Pharmacopeia, monograph 3.1.15, USP and elemental analysis as per ICH Q3D - USP criteria appearance of solution, color • Registered Drug Master File (Type III) by the FDA • Food contact compliance established with FDA/EU* • YBB00102002-2015 (oral liquid pharmaceutical PET bottles) compliance support APPLICATION BULLETIN * FDA/EU compliance information available upon request Healthcare use limitations apply—see below.

url=https%3A%2F%2Fwww.cbp.gov%2Ftrade%2Fforced-labor&data=05%7C01%7Cjacqueline.thomson%40avient.com%7Ca0427e02fa1b4b576fe208db6dac207e%7C7bc21b5c83b04482be9e2825d33c1759%7C0%7C0%7C638224359373869329%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=xxFjS7ADNXRYgriLexntpLUCOyllzLGactoRmj2EoCE%3D&reserved=0 https://www.avient.com/sites/default/files/2020-10/avient-conflict-minerals-policy-10.2020.pdf https://www.avient.com/sites/default/files/2020-10/avient-conflict-minerals-policy-10.2020.pdf • Engage in due diligence of supply chains by following a nationally or internationally recognized due diligence framework; • Upon request, report to Avient on its due diligence process and certify that 3TG metals supplied to Avient from the Covered Countries are conflict free; and • Promptly report to Avient any supply chain changes regarding the origin of 3TG metals or conflict status. • Enable employees and other stakeholders to report questions or concerns related to your business, people or products. • Uphold freedom of association and the right to collective bargaining in accordance with applicable laws. External communications about Avient require Avient’s prior written consent. • Inform Avient of financial, economic, supply changes (including origin or conflict status of 3TG metals), government regulations or other materials conditions that could affect ongoing operations or operating decisions, or if the company has been debarred as a government contractor. • Establish an information security and data privacy system to protect Avient’s information, including information of its customers and employees, from being disclosed, changed, destroyed, or used for any purpose other than the purpose for which it was provided.

url=https%3A%2F%2Fwww.cbp.gov%2Ftrade%2Fforced-labor&data=05%7C01%7Cjacqueline.thomson%40avient.com%7Ca0427e02fa1b4b576fe208db6dac207e%7C7bc21b5c83b04482be9e2825d33c1759%7C0%7C0%7C638224359373869329%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=xxFjS7ADNXRYgriLexntpLUCOyllzLGactoRmj2EoCE%3D&reserved=0 https://www.avient.com/sites/default/files/2020-10/avient-conflict-minerals-policy-10.2020.pdf https://www.avient.com/sites/default/files/2020-10/avient-conflict-minerals-policy-10.2020.pdf https://www.avient.com/sites/default/files/2020-10/avient-conflict-minerals-policy-10.2020.pdf https://www.avient.com/sites/default/files/2020-10/avient-conflict-minerals-policy-10.2020.pdf https://www.avient.com/sites/default/files/2020-10/avient-conflict-minerals-policy-10.2020.pdf • Engage in due diligence of supply chains by following a nationally or internationally recognized due diligence framework; • Upon request, report to Avient on its due diligence process and certify that 3TG metals supplied to Avient from the Covered Countries are conflict free; and • Promptly report to Avient any supply chain changes regarding the origin of 3TG metals or conflict status. • Enable employees and other stakeholders to report questions or concerns related to your business, people or products. • Uphold freedom of association and the right to collective bargaining in accordance with applicable laws. External communications about Avient require Avient’s prior written consent. • Inform Avient of financial, economic, supply changes (including origin or conflict status of 3TG metals), government regulations or other materials conditions that could affect ongoing operations or operating decisions, or if the company has been debarred as a government contractor. • Establish an information security and data privacy system to protect Avient’s information, including information of its customers and associates, from being disclosed, changed, destroyed, or used for any purpose other than the purpose for which it was provided.

Sincerely, Helen Devine Helen Devine Certified Paralegal hdevine@OhioSOS.gov DOC ID ----> 202018203934 Change to the Name of the Company; Articles of Incorporation WHEREAS, the Board of Directors (the “Board”) of PolyOne Corporation, an Ohio corporation (the “Company”), deems it to be advisable and in the best interest of the Company to change its corporate name; and WHEREAS, the Board deems it to be advisable and in the best interest of the Company to amend the Company’s Articles of Incorporation, as amended, to reflect the Company’s new name. NOW, THEREFORE, BE IT RESOLVED, that, effective as of the time and date that the applicable certificate is accepted for filing by the Ohio Secretary of State (the “Effective Time”), the name of the Company shall be changed from “PolyOne Corporation” to “Avient Corporation.”

In particular, these include statements relating to future actions; prospective changes in raw material costs, product pricing or product demand; future performance; estimated capital expenditures; results of current and anticipated market conditions and market strategies; sales efforts; expenses; the outcome of contingencies such as legal proceedings and environmental liabilities; and financial results. Factors that could cause actual results to differ materially from those implied by these forward-looking statements include, but are not limited to: • Disruptions, uncertainty or volatility in the credit markets that could adversely impact the availability of credit already arranged and the availability and cost of credit in the future; • The effect on foreign operations of currency fluctuations, tariffs and other political, economic and regulatory risks; • Changes in laws and regulations regarding plastics in jurisdictions where we conduct business; • Fluctuations in raw material prices, quality and supply, and in energy prices and supply; • Production outages or material costs associated with scheduled or unscheduled maintenance programs; • Unanticipated developments that could occur with respect to contingencies such as litigation and environmental matters; • Our ability to achieve strategic objectives and successfully integrate acquisitions, including Avient Protective Materials (APM); • An inability to raise or sustain prices for products or services; • Our ability to pay regular quarterly cash dividends and the amounts and timing of any future dividends; • Information systems failures and cyberattacks; • Amounts for cash and non-cash charges related to restructuring plans that may differ from original estimates, including because of timing changes associated with the underlying actions; and • Other factors affecting our business beyond our control, including without limitation, changes in the general economy, changes in interest rates, changes in the rate of inflation and any recessionary conditions Use of Non-GAAP Measures This presentation includes the use of both GAAP (generally accepted accounting principles) and non-GAAP financial measures. Global Compact • Highlights ESG Performance, including ratings, awards, and certifications • Features increased carbon emissions disclosures, including Climate Change Scenario Analysis and Scope 3 emissions data • Outlines Sustainable Supplier Program, designed to enable supplier evaluation & collaboration • Reflects Great Place To Work® culture focused on safety, employee engagement and advancing diversity, equity and inclusion 2022 SUSTAINABILITY REPORT 19 Avient Confidential 20 • Virtual presentation to be held September 20, 2023 • Leadership will be conducting an investor-focused presentation around our sustainable solutions portfolio • Deep dive into how we enable customers to achieve their sustainability goals SUSTAINABILITY DAY 20 …are Growing at Twice the Rate as Conventional Products Sustainably-Branded Products… STAKEHOLDER INFLUENCE DRIVES DEMAND Consumers Are demanding recyclability and eco- conscious products Governments Are mandating changes through legislation, taxes, and regional accords Brand Owners Have committed to ambitious goals to achieve sustainability metrics 21 AP P EN D IX 24 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 PEER COMPARISONS AVIENT IS ASSET LIGHT Capex / Revenue 2023E (%) Avient Specialty Formulators Other Specialty / Chemical Companies Source: Peer data per Bloomberg as of August 17, 2023 Note: Avient reflects 2023 estimated revenue of $3,280 and estimated run-rate CAPEX of $110M. 26 3 2 3 3 4 4 3 4 5 5 7 7 9 10 A vi en t K W R P P G F U L A V Y R P M F M C H U N C E E C L A S H H X L E M N S C L FREE CASH FLOW CONVERSION Source: Peer data per Bloomberg as of August 17, 2023 Note: Free cash flow conversion calculated as (Adjusted EBITDA – Capex) / Adjusted EBITDA.

In order to reduce residence time at high temperatures, the rear zone temperatures should be reduced as much as possible, while maintaining the last zone and nozzle at the high processing temperature. Corrective Actions • Adjust melt velocity and 1st stage injection pressure. • Change to a lower molecular weight formulation. Corrective Actions • Adjust melt velocity and 1st stage injection pressure. • Change to a lower molecular weight formulation.

ELECTRICAL PARTS MANUFACTURER H E A V Y D U T Y C O N N E C T O R S A N D A C C E S S O R I E S • Reduce material rematching and rejection through more efficient pre-testing • Improve processing efficiencies and color consistency in highly FR-filled and high-temperature resins • Achieve regulatory compliance across multiple resin families • Gain better supply chain control to manage scarcity of key engineering resins and changing resin producers • Offered eight UL 94-recognized sites in U.S. and Canada that perform comprehensive analytical, physical and mechanical testing • Provided increased speed to market and expedited design timelines for new products using existing standardized and pre- approved color palettes • Ensured regulatory compliance and security of supply OnColor™ UL 94 Colorants KEY REQUIREMENTS WHY AVIENT AVIENT SOLUTION QUALITY + SPEED TO MARKET LEARN MORE © 2023, Avient Corporation, All Rights Reserved https://www.avient.com/products/polymer-colorants/solid-color-masterbatches/oncolor-ul94-colorants

In doing so, we innovate solutions that help our customers overcome their challenges or capitalize on opportunities provided by the fast-changing world and secular trends. What makes me particularly proud of all these accomplishments is that we achieved them during a year of significant change—important change—as we developed and began executing our new company strategy. Annual Report | 2024 2 STOCK EXCHANGE LISTING Avient's Common Stock is listed on the New York Stock Exchange, Symbol: AVNT SHAREHOLDER INQUIRIES If you have any questions concerning your account as a shareholder, name or address changes, inquiries regarding stock certificates, or if you need tax information regarding your account, please contact our transfer agent: Equiniti Trust Company, LLC 1110 Centre Pointe Curve, Suite 101 Mendota Heights, MN 55120-4100 Phone: 1-855-598-2615 or 1-651-450-4064 www.shareowneronline.com Additional information about Avient, including current and historic copies of Annual Reports on Form 10-K and other reports filed with the Securities and Exchange Commission, is available online at www.avient.com or free of charge from: Investor Relations Avient Corporation 33587 Walker Road Avon Lake, Ohio 44012 Phone: 1-440-930-1000 ANNUAL MEETING The annual meeting of Avient will be held virtually via live webcast at 9:00 a.m.

KEY CHARACTERISTICS • Manufactured at four ISO 13485 certified sites, providing global consistency and increased security of supply • Documented change control beyond CAS number reducing risk of change • Non-phthalate and formulated without animal- derived substances • Available for use in a wide range of polymers including polyolefins, styrenics, polycarbonate and alloys, polyester, POM • Functionality can be combined with colorants into convenient combination concentrates and ready-to-use formulations REGULATORY SUPPORT • Raw materials tested to: - ISO 10993-1 and USP biological evaluation - European Pharmacopeia 3.1.3/3.1.5 (polyolefin) - USP (polyethylene) - ICH Q3D elemental impurities • Registered Drug Master File (Type III) and/or Device Master File • Food contact established with FDA/EU* APPLICATION BULLETIN * FDA/EU compliance information available upon request FUNCTIONALITY TARGET APPLICATIONS DRUG DELIVERY DEVICES SYRINGES & NEEDLES DIAGNOSTICS CATHETERS Clarifying PP Sorbitol-free for transparent applications with reduced migration and improved thermal stability     Lubricant— permanent/ non-migrating Fast acting reduction in friction for wide variety of polymers such as PP, ABS, POM, PC    Protection from UV in transparent applications for PP, PE, PETG, COP UV blocking in 290-450nm with no impact on clarity; can be combined with colors (e.g., amber)   Antistatic ready-to- use solution for PP, ABS, PC/ABS Permanent/non-migrating; fast decay time independent of % relative humidity  Gamma/e-beam sterilization protection of the polymer Preserving the properties of PP and COC/COP; reduction in yellowing using Color Compensation Technology (CCT)    Reduced material consumption/cycle time—nucleation Fast acting new generation nucleant for PE and PP; improved thermal and mechanical properties allows wall thinning; reduction of tolerance/dimensional problems between different colors    Laser marking replacing ink printing/labels Solvent-free, high-speed identification for Nd/YAG laser for PE,PP, ABS, PC, POM     Antioxidants for PE, PP, TPE Thermal protection during converting/downstream sterilization    Brand protection/ anticounterfeit Covert and non-covert systems   Healthcare use limitations apply—see below.