AVIENT RESPONSIBLE CARE POLICY Avient Corporation conducts its operations in a manner that is protective of the environment, and the health, safety and security of associates, customers, and all our stakeholders, including the communities in which we operate. We further define these commitments with individual Policies on Environment, Safety & Health, Security and Product Stewardship.

For individuals, this is generally your social security number (SSN). If you have changed your last name without informing the Social Security Administration (SSA) of the name change, enter your first name, the last name as shown on your social security card, and your new last name. Enter it in the social security number box.

2)OSHA recordable injuries per 100 full-time workers per year 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, 2023 ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Our CISO and cybersecurity teams hold relevant certifications, including, but not limited to, Certified Information Systems Security Professional, Security+ Certification, Factor Analysis for Information Risk Analyst, Certified Information Systems Auditor, Security Systems Certified Practitioner or Certified Federal Information Security Management Act Compliance Practitioner. Senior secured revolving credit facility due 2026 $ — $ — Senior secured term loan due 2026 — 423.6 Senior secured term loan due 2029 709.0 385.5 5.75% senior notes due 2025 647.2 645.2 7.125% senior notes due 2030 716.2 714.9 Other Debt 7.6 9.7 Total Debt $ 2,080.0 $ 2,178.9 Less short-term debt 9.5 2.2 Total long-term debt, net of current portion $ 2,070.5 $ 2,176.7 On August 16, 2023, the Company refinanced its senior secured term loans by amending its Credit Agreement (the Term Loan Amendment).

Prohibition on Hedging or Pledging Our Securities. 2018 Summary Compensation Table Stock Awards (column (d)) Option Awards (column (e)) Name and Principal Position (a) Year Salary (c) Stock (d) Non-Equity Incentive Plan Compensation ($) All Other Compensation Total Lisa K. Exercise or Base Price of Option Awards (column (i)) Grant Date Fair Value of Stock and Option Awards (column (j)) Narrative Disclosure Relating to the 2018 Summary Compensation Table and the 2018 Grants of Plan-Based Awards Table Outstanding Equity Awards at 2018 Fiscal Year-End Exercise Price Expiration Date Market Value of Shares or Units of Stock That Have Not Vested Equity Incentive Plan Awards: Market or Payout Value of Unearned Shares, Units or Other Rights that Have Not Vested (j) Stock Awards Equity Incentive Plan Awards: Number of Securities Underlying Unearned Options Equity Incentive Plan Awards: Number of Unearned Shares, Units or Other Rights that Have Not Vested (i) Number of Shares or Units of Stock That Have Not Vested Number of Underlying Unexercised Options (#) Unexercisable Number of Securities Underlying Options (#) Exercisable Option Awards Number of Securities Underlying Unexercised Options (#) Exercisable (column (b)) Number of Securities Underlying Unexercised Options (#) Unexercisable (column (c)) Equity Incentive Plan Awards: Number of Securities Underlying Unexercised Unearned Options (column (d)) Option Exercise Price (column (e)) Option Expiration Date (column (f)) Number of Shares or Units of Stock That Have Not Vested (column (g)) Market Value of Shares or Units of Stock That Have Not Vested (column (h)) Equity Incentive Plan Awards: Number of Unearned Shares, Units or Other Rights That Have Not Vested (column (i)) Equity Incentive Plan Awards: Market or Payout Value of Unearned Shares, Units or Other Rights That Have Not Vested (column (j)) 2018 Option Exercises and Stock Vested Option Awards Stock Awards Acquired on Exercise Value Realized on Exercise Acquired on Vesting Value Realized on Vesting Option Awards (columns (b) and (c)) Stock Awards (columns (d) and (e)) 2018 Nonqualified Deferred Compensation Aggregate Executive Registrant Aggregate Aggregate Aggregate Balance at Contributions Contributions Earnings Withdrawals/ Balance at in Last FY in Last FY in Last FY Distributions Last FYE (1) ($)(2) ($)(3) ($)(4) ($) ($)(1)(5) Potential Payments Upon Termination or Change of Control Summary of Potential Payments Management Continuity Agreements Executive Severance Plan Annual Plan Long-Term Incentive Awards Retirement Benefits Payments and Benefits Upon Termination — As of the End of Fiscal Year 2018 CEO Pay Ratio Disclosure CEO Annual Total Compensation for 2018: $6,127,920 Median Employee Annual Total Compensation for 2018: $48,056 Ratio of CEO to Median Employee Annual Total Compensation for 2018: 128:1 How the Median Employee was Determined in 2017 Compensation Committee Interlocks and Insider Participation Policy on Related Person Transactions Risk Assessment of the Compensation Programs Compensation Committee Report The Compensation Committee of the Board of Directors MISCELLANEOUS MISCELLANEOUS PROVISIONS Voting at the Meeting not Shareholder Proposals MISCELLANEOUS Proxy Solicitation We will furnish without charge to each person from whom a proxy is being solicited, upon written request of any such person, a copy of the Annual Report on Form 10-K of the Company for the fiscal year ending December 31, 2018, as filed with the SEC, including the financial statements and schedules thereto.

All Security Incidents shall be reported to Avient via email to soc@avient.com without undue delay and not later than 24 hours upon becoming aware of or suspecting a Security incident. For all Goods supplied to the U.S. and/or Canada, Supplier shall comply with CTPAT supply chain security guidelines. Supplier shall report any irregularity with respect to safety, health and environment and security.

In this press release, statements that are not reported financial results or other historical information are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Securities and Exchange Commission We provide Adjusted EBITDA because we believe that investors and securities analysts will find Adjusted EBITDA to be a useful measure for evaluating our operating performance.

In this press release, statements that are not reported financial results or other historical information are "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. Securities and Exchange Commission We provide Adjusted EBITDA because we believe that investors and securities analysts will find Adjusted EBITDA to be a useful measure for evaluating our operating performance.

This material offers the stiffness and high impact performance required to support and secure multiple electronic attachments, and provides the impact and temperature resistance needed. HellermannTyton decided to develop the seat securement part using injection-molded Bergamid resin in a standard black color. The new seat securement part has already been adopted by one OEM customer, and we are confident that other manufacturers will come to us for this lightweight, cost-efficient solution.”

PLASTIWARD Counterfeiting Protection Rethinking in-product security for plastic made articles in multiple applications Are you a plastic articles manufacturer keen on taking your mission of providing end-consumers with a safe product to the next level? TURNKEY SYSTEM PLASTIWARD is a robust, customizable and cost-effective turnkey system consisting of: · proprietary taggants integrated directly within the polymer masterbatch · a handheld detector offering instant fake- checking in the field · a secure monitoring platform on smartphone or tablet capturing field inspection data, transmitted in real time COMBINED EXPERTISE At its core, PLASTIWARD brings together SICPA’s trusted expertise in brand protection technologies and processes, and Avient’s recognized expertise in polymer modification with colour and performance additives. The result of a partnership between SICPA and Avient, PLASTIWARD is a prime example of how we enable our customers to focus on their core business as we implement security features— without disrupting their supply chain—at the core of their product. 1.844.4AVIENT www.avient.com Copyright © 2021, Avient Corporation.

EXPECTATIONS FOR USE OF INFORMATION SYSTEMS Users shall: • Use all Information Systems consistent with their intended purpose, Avient business objectives, and the Code of Conduct; • Take necessary steps to prevent unauthorized access to and maintain security of Confidential Data; • Use only approved and secured methods when sharing Confidential Data and ensure recipients have authorization to receive Confidential Data and/or have obtained prior approval from User’s manager; and • Obtain approval from Avient’s Information Technology department before procuring, installing, connecting, using, or decommissioning software, systems, applications, or non- Avient devices to or from Information Systems, including, but not limited to, on premise and cloud-based systems. Confidential 4 Avient IT Department Information Systems Use Policy September 1, 2021 Additionally, the following Information Systems uses are prohibited unless specifically authorized by Avient or authorized Avient IT representatives: • Revealing account usernames, passwords, or other Personal Data to others or allowing use of Information Systems by others, including family and other household members; • Conducting any form of network monitoring that could intercept data not intended for the recipient User; • Circumventing User authentication or security of any Information Systems; or • Using personal devices to access Confidential Data or connect to Information Systems. For example, Personal Data could be an individual’s Social Security Number (SSN), name, address, date of birth, tax identification number or equivalent, credit or debit card number, or financial account number.