The Company does not provide reconciliations of forward-looking non-GAAP financial measures, such as outlook for net debt to adjusted EBITDA leverage, to the most comparable GAAP financial measures on a forward-looking basis because the Company is unable to provide a meaningful or accurate calculation or estimation of reconciling items and the information is not available without unreasonable effort.

This news release does not constitute an offer to sell or the solicitation of an offer to buy any securities nor shall there be any sale of these securities in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.

Avient associates globally have had the opportunity to hear and learn from renowned speakers on a wide range of topics, such as career development, building trust, how diversity fuels innovation, unconscious bias, and belonging. In 2022, LEAD by Women celebrated its fifth anniversary and took the opportunity to reflect on its evolution and how the organization has helped advance Avient’s Diversity and Inclusion journey. Inspiring our associates to have great conversations about diversity and how to value and embrace our differences and perspectives.”

Sync design with manufacturability: Learn how Avient Design Labs can help with your next project Imagine the outcome if you could instill your next new product with design expertise that also takes material science and processing know-how into account? Sync design with manufacturability: Learn how Avient Design Labs can help with your next project

Reasons for the occurrence of fog in food packaging and how to prevent it (Chinese language version) How TPEs provide sensory enhancement in surface feel and texture Discover how Avient’s ColorMatrix Amosorb oxygen scavengers and Ultimate UV™ light barrier can protect coconut water from oxygen and light-induced degradation

Reasons for the occurrence of fog in food packaging and how to prevent it (Chinese language version) How TPEs provide sensory enhancement in surface feel and texture Discover how Avient’s ColorMatrix Amosorb oxygen scavengers and Ultimate UV™ light barrier can protect coconut water from oxygen and light-induced degradation

Factors that could cause actual results to differ materially from those implied by these forward-looking statements include, but are not limited to: our ability to realize anticipated savings and operational benefits from the realignment of assets, including the closure of manufacturing facilities; the timing of closings and shifts of production to new facilities related to asset realignments and any unforeseen loss of customers and/or disruptions of service or quality caused by such closings and/or production shifts; separation and severance amounts that differ from original estimates; amounts for non-cash charges related to asset write-offs and accelerated depreciation realignments of property, plant and equipment, that differ from original estimates; our ability to identify and evaluate acquisition targets and consummate acquisitions; the ability to successfully integrate acquired businesses into our operations, including whether such businesses will be accretive, retain the management teams of acquired businesses, and retain relationships with customers of acquired businesses; 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 financial condition of our customers, including the ability of customers (especially those that may be highly leveraged and those with inadequate liquidity) to maintain their credit availability; the speed and extent of an economic recovery, including the recovery of the housing market; our ability to achieve new business gains; the effect on foreign operations of currency fluctuations, tariffs and other political, economic and regulatory risks; changes in polymer consumption growth rates and laws and regulations regarding the disposal of plastic in jurisdictions where we conduct business; changes in global industry capacity or in the rate at which anticipated changes in industry capacity come online; 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; an inability to achieve or delays in achieving or achievement of less than the anticipated financial benefit from initiatives related to working capital reductions, cost reductions and employee productivity goals; an inability to raise or sustain prices for products or services; an inability to maintain appropriate relations with unions and employees; our ability to continue to pay cash dividends; the amount and timing of repurchases of our common shares, if any; and other factors affecting our business beyond our control, including, without limitation, changes in the general economy, changes in interest rates and changes in the rate of inflation. Special items include charges related to specific strategic initiatives or financial restructuring such as: consolidation of operations; debt extinguishment costs; costs incurred directly in relation to acquisitions or divestitures; employee separation costs resulting from personnel reduction programs, plant phase-in costs, executive separation agreements; asset impairments; mark-to-market adjustments associated with actuarial gains and losses on pension and other post-retirement benefit plans; environmental remediation costs, fines, penalties and related insurance recoveries related to facilities no longer owned or closed in prior years; gains and losses on the divestiture of operating businesses, joint ventures and equity investments; gains and losses on facility or property sales or disposals; results of litigation, fines or penalties, where such litigation (or action relating to the fines or penalties) arose prior to the commencement of the performance period; one-time, non-recurring items; and the effect of changes in accounting principles or other such laws or provisions affecting reported results. Operating income at the segment level does not include: special items as defined on Attachment 3; corporate general and administration costs that are not allocated to segments; intersegment sales and profit eliminations; share-based compensation costs; and certain other items that are not included in the measure of segment profit and loss that is reported to and reviewed by the chief operating decision maker.

SAFETY Equipment security, fire prevention, user safety, functional performance SOLUTIONS: Flame retardants, anti-static and conductive formulations, antimicrobials, light diffusion technology LONGEVITY Long service life, chemical resistance SOLUTIONS: Scratch and mar resistant additives, impact modifiers, reinforced materials, rheology modifiers, compatibilizers OUTDOOR DURABILITY & WEATHERABILITY UV protection, chemical resistance, wind and impact resistance, color stability, light spectrum management, polymer integrity SOLUTIONS: UV resistant formulations, dimensional stabilizers, antioxidants, IR reflective, scratch and mar resistant solutions, modifiers and compatibilizers SUSTAINABILITY Eco-conscious options, lightweighting, VOC or carbon emissions reduction, reduced energy use SOLUTIONS: Bio-derived colorants and additives, chemical foaming agents, molded-in metallics, post-consumer recycled (PCR) formulations VISUAL AESTHETICS Custom colors, special effects and enhancements SOLUTIONS: Metallic or chrome- look colorants, pearlescents, granite or marble effects, wood grains, glow-in-the-dark technology HEALTH & HYGIENE Protection from mold, mildew, bacteria and unwanted odors SOLUTIONS: Antimicrobial and antifungal technologies, surface energy modification GO-TO-MARKET SUPPORT We have resources beyond our product technologies to help you get to market faster and more effectively Streamlined product development services through Avient Design • Color inspiration and technical guidance from ColorWorks™ Design & Technology Centers • Risk mitigation through invaluable regulatory compliance support • Accelerated commercialization with UL testing and part validation, and UL- recognized colorants FOCUS AREA APPLICATIONS KEY REQUIREMENTS TECHNOLOGIES Visual Aesthetics • User interfaces and touchpoints • Interactive touch screens • Lighting • Side panels and base plates • Cables • Closeouts • Informed color choices and customization options • Visual appeal for brand integrity • High- and low- gloss finishes • Consistent physical performance and dimensional stability • Special effect colorants • Smartbatch Combination Colorants & Additives • Custom and pre-colored formulations • ColorWorks Design & Technology Centers Outdoor Durability & Longevity • Ventilation panels • Closeouts • Cable retractors • Interactive touch screens • Outdoor weathering • Extreme (hot/cold) temperature resistance • Flexibility and ductility • Impact resistance • Chemical resistance • UL-recognized materials • Flame retardant formulations • Impact modifiers • Surface energy modifiers • EMI/RFI shielding solutions • Thermal and electrical management technology Health & Hygiene • User interfaces and touchpoints • Cables • Sockets • Plugs and adaptors • Filters • Kiosks • Microbial and fungal efficacy • Safe to touch • Visual clarity • Surface energy modifiers • Antimicrobial and anti- fungal solutions Sustainability • Structural panels • Connectors and electrical components • Thermal modules • Lighting • Receptacles • Reduced part weight or materials consumed • Recyclability • VOC reduction • PCR incorporation • Lower carbon footprint • Chemical foaming agents • Molded-in color (MIC) metallics • Laser marking technologies • Eco-conscious raw materials • Bio-derived technologies • Post-consumer recycled (PCR) content • Lower carbon footprint solutions 1.844.4AVIENT www.avient.com Copyright © 2023, Avient Corporation.

Factors that could cause actual results to differ materially from those implied by these forward-looking statements include, but are not limited to: our ability to realize anticipated savings and operational benefits from the realignment of assets, including the planned closure of certain manufacturing facilities; the timing of closings and shifts of production to new facilities related to asset realignments and any unforeseen disruptions of service or quality caused by such closings and/or production shifts; separation and severance amounts that differ from original estimates, amounts for non-cash charges related to asset write-offs and accelerated depreciation realignments of property, plant and equipment, that differ from original estimates; our ability to identify and evaluate acquisition targets and consummate acquisitions; the ability to successfully integrate acquired companies into our operations, retain the management teams of acquired companies and retain relationships with customers of acquired companies including, without limitation, Spartech Corporation; 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 financial condition of our customers, including the ability of customers (especially those that may be highly leveraged and those with inadequate liquidity) to maintain their credit availability; the speed and extent of an economic recovery, including the recovery of the housing market; our ability to achieve new business gains; the effect on foreign operations of currency fluctuations, tariffs and other political, economic and regulatory risks; changes in polymer consumption growth rates where we conduct business; changes in global industry capacity or in the rate at which anticipated changes in industry capacity come online; 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; an inability to achieve or delays in achieving or achievement of less than the anticipated financial benefit from initiatives related to working capital reductions, cost reductions and employee productivity goals; an inability to raise or sustain prices for products or services; an inability to maintain appropriate relations with unions and employees; our ability to continue to pay cash dividends; the amount and timing of repurchases of our common shares, if any; and other factors affecting our business beyond our control, including, without limitation, changes in the general economy, changes in interest rates and changes in the rate of inflation. Special items include charges related to specific strategic initiatives or financial restructurings such as: consolidation of operations; debt extinguishment costs; employee separation costs resulting from personnel reduction programs, plant phase-out costs, executive separation agreements; asset impairments; mark-to-market adjustments associated with actuarial gains and losses on pension and other postretirement benefit plans; environmental remediation costs, fines, penalties, remediation costs and related insurance recoveries related to facilities no longer owned or closed in prior years; gains and losses on the divestiture of operating businesses, joint ventures and equity investments; gains and losses on facility or property sales or disposals; results of litigation, fines or penalties, where such litigation (or action relating to the fines or penalties) arose prior to the commencement of the performance period; unrealized gains and losses from foreign currency option contracts; one-time, non-recurring items; and the effect of changes in accounting principles or other such laws or provisions affecting reported results. Operating income at the segment level does not include: special items as defined on Attachment 3; corporate general and administration costs that are not allocated to segments; intersegment sales and profit eliminations; share-based compensation costs; and certain other items that are not included in the measure of segment profit and loss that is reported to and reviewed by the chief operating decision maker.

This is to confirm that the Environmental, Health, Safety and Security Management System of: Avient Corporation HQ 33587 Walker Road The Environmental, Health, Safety and Security Management System is applicable to: Certificate No: 65536 Effective Date: 29 September 2023 Expiration Date: 28 September 2026 Revision Date: 22 November 2023 Dominic Townsend, President CORPORATE SUPPORT ACTIVITIES, DESIGN, MANUFACTURE AND DISTRIBUTION OF COLOUR AND ADDITIVE CONCENTRATES, THERMOPLASTIC RESINS AND PELLETS, SPECIALTY COMPOUNDS AND COLORANTS.