We help our customers increase post-consumer recycled content, formulate with bio-based materials, use less material during production, reduce energy required for production, and build alternative energy applications. As the world continues to shift from operating in a CORPORATE GOVERNANCE PROXY STATEMENT 2022 | Annual Meeting of Shareholders 31 linear economy to a circular economy, and with guidance from our Board and the commitment of our associates, investments in R&D and innovation will continue to help our customers create recyclable packaging, increase post-consumer recycled content, formulate with bio-based materials, use less material during production and reduce energy required for production.

We help our customers increase post- consumer recycled content, formulate with bio-based materials, use less material during production, reduce energy required for production, and build alternative energy applications. Year Ended December 31, 2023 Adjusted Free Cash Flow Calculation Cash provided by operating activities $ 201.6 Taxes paid on gain on sale of business 104.1 Adjusted cash provided by operating activities 305.7 Capital expenditures (119.4) Adjusted free cash flow $ 186.3 Year Ended December 31, 2023 Reconciliation to Operating Income - Consolidated Operating income - GAAP $ 196.8 Special items in operating income 116.0 Adjusted operating income $ 312.8 Year Ended December 31, 2023 Reconciliation to Operating Income - CAI Operating income - GAAP $ 259.9 Foreign exchange impacts (8.0) Adjusted operating income $ 251.9 A-2 Cover Page Table of Contents Letter to our Shareholders Notice of 2024 Annual Meeting Proxy Summary Voting and Meeting Info Company Operating Performance Our Company Culture Impact of Performance on NEO Comp Director Nominees Governance Highlights Proposal 1 - BOD Election Director Bios Proposal 2 - Advisory Vote Proposal 3 - Ratification of EY Report of Audit Committee Corporate Governance 2023 Non-Employee Director Compensation Ownership of Avient Shares CD&A - Executive Summary CD&A - Key Results (narrative) CD&A - PFP and Exec Comp CD&A - Exec Comp Philosopy CD&A - What we pay and Why Executive Compensation - Tables CEO Pay Ratio Pay Versus Performance Miscellaneous Appendix A

We help our customers increase post- consumer recycled content, formulate with bio-based materials, use less material during production, reduce energy required for production, and build alternative energy applications. Proposal 1 - BOD Election Director Bios 8.

And we formulate bio-based products by incorporating other natural materials like soy, algae or corn to meet customers’ exacting and unique specifications while reducing fossil fuel consumption.

Long-term trends that currently provide opportunities to leverage our strategy include the drive toward sustainability in polymers and their processing, the emergence of biodegradable and bio-based polymers, consumer concern over the use of bisphenol-A (BPA) in infant-care products and developing legislation that bans lead and certain phthalates from toys and child-care items.

Long-term trends that currently provide opportunities to leverage our strategy include the drive toward sustainability in polymers and their processing, the emergence of biodegradable and bio-based polymers, consumer concern over the use of bisphenol-A (BPA) in infant-care products and developing legislation that bans lead and certain phthalates from toys and child-care items.

Long-term trends that currently provide opportunities to leverage our strategy include the drive toward sustainability in polymers and their processing, the emergence of biodegradable and bio-based polymers, consumer concern over the use of bisphenol-A (BPA) in infant-care products and developing legislation that bans lead and certain phthalates from toys and child-care items.

Patterson Chairman, President and CEO *Avient Sustainable Solutions definitions aligned with FTC 2012 Guide for the Use of Environmental Marketing Claims (“Green Guides”) **2020 is Pro forma to include full year of the Clariant Color business 2016 2017 2018 2019 2020PF** 2021 Revenue from Sustainable Solutions* 2016–2021 Lightweighting Eco-conscious Sustainable Infrastructure Human Health & Safety Reduced Energy Use Bio-polymers Recycle Solutions VOC Reduction 12% Organic CAGR End Market Transformation* � �� �� �� �� �� �� Transportation Building & Construction Healthcare Packaging Consumer 57% 21% 57% 22% 14% 43% 11% 10% 8% 10% 4% 19% 23% 15% $790M $550M $405M $455M $340M $915M 2006 2021 2006 2021 *End market revenue as a percent of total United States Securities and Exchange Commission Washington, DC 20549 FORM 10-K ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to .

• You can be confi dent that, in formulating and manufacturing our materials, we use sustainable practices to provide long- term product viability and sound environmental stewardship • You can expect that the materials we produce contain only ingredients that conform to accepted legal and regulatory compliance guidelines • You can trust that PolyOne materials meet the rigorous quality and safety management standards required across the globe • You can be certain that PolyOne meets or exceeds the material safety data reporting requirements of your country or region • When you choose PolyOne, you can be confi dent our products will help you meet or exceed today’s stringent compliance standards HELPING CUSTOMERS MEET THEIR GOALS THROUGH MATERIAL SCIENCE 66672.indd main_6 3/25/19 4:00 PM 7 *PolyOne Sustainable Solutions defi nitions aligned with FTC 2012 Guide for the Use of Environmental Marketing Claims (“Green Guides”) 2016 2017 2018 20% INCREASE HELPING CUSTOMERS BECOME MORE SUSTAINABLE $480M $440M $400M $1.3 BILLION IN REVENUE FROM SUSTAINABLE SOLUTIONS* 2016–2018 Lightweighting Reduced Material Requirements Improved Recyclability Renewable Energy Applications Eco-conscious Composition Bio-derived Content Reduced Energy Use Volatile Organic Compound Reduction PolyOne off ers a broad portfolio of technologies that help our customers—and our planet—be more sustainable.

Long-term trends that currently provide opportunities to leverage our strategy include the drive toward sustainability in polymers and their processing, the emergence of biodegradable and bio-based polymers, consumer concern over the use of bisphenol-A (BPA) in infant-care products and developing legislation that bans lead and certain phthalates from toys and child-care items.