8:00 a.m. November 3, 2020 at 8:00am ET ET, November 3, 2020

8] D. Comp. 2006, 8, 30. [11] P. Sci. 2021, 1. https://doi.org/10.1002/pen.25815 8 ZANDER ET AL.

We thank you for your understanding, and we look forward to serving your needs. 3 Table of contents A Message from our Global Quality Manager ...............................................................2 Avient Corporation: Overview ............................4 Avient Policy for Customer Audits ......................5 Management Responsibility ...............................6 Product Liability Insurance .............................6 Ethics - Code of Conduct.................................6 Modern Slavery Statement .............................6 Conflict Mineral Policy ....................................6 Technical Data Sheets.....................................6 Safety Data Sheets..........................................6 Regulatory Requests and Certificates (FDA certificate, Absence declaration, REACH, SDS) ........................................6 Safety Performance ........................................6 Environmental Performance...........................6 Energy Management ......................................6 Business Continuation Plan.............................6 Preventive - Predictive Maintenance..............6 Financial Report..............................................6 Quality Management..........................................7 3rd Party Certification ......................................7 Complaint Handling ........................................7 Continuous Improvement ...............................7 Traceability .....................................................7 Record Retention............................................7 IT Security.........................................................8 Firewall .........................................................8 Critical Data ..................................................8 IT Disaster Recovery .....................................8 IT Systems of Use Policy ...............................8 Annex 1 - Special dispositions related to ISO 13485 certification for Mevopur .......................9 Change control .............................................9 Validation .....................................................9 Control of documents and records ...............9 Supplier approval and supplier evaluation ...9 Traceability ...................................................9 Material management ..................................9 Release of finished products.........................9 Control of Non-conforming products, complaints handling, recall and CAPA..........9 Annex 2 – special dispositions related to ISO 22000 certification............................................10 Change..........................................................10 HACCP ..........................................................10 Control of documents and records ...............10 Material management ..................................10 Supplier approval and supplier evaluation ...10 Traceability ...................................................10 Release of finished products.........................10 Control of Non-conforming products, complaints handling, recall and CAPA..........10 4 Avient Corporation: Overview The Avient website is your home base for information about the company: http://www.avient.com/ To find our facility locations: http://www.avient.com/contact/global-directory-and-contacts For more information about our management systems certifications, including ISO, go to: http://www.avient.com/company/sustainability/environmental/global-iso-certificate-library Avient Governance (corporate policies and the Avient Code of Conduct): http://www.avient.com/investors/governance Financial reports: https://www.avient.com/investors Avient Sustainability Report: https://www.avient.com/company/sustainability http://www.avient.com/ http://www.avient.com/contact/global-directory-and-contacts http://www.avient.com/company/sustainability/environmental/global-iso-certificate-library http://www.avient.com/investors/governance https://www.avient.com/investors https://www.avient.com/company/sustainability 5 Avient Policy for Customer Audits Avient may permit audits of facilities, subject to:  Advanced notice and an audit agenda provided at least thirty (30) days in advance or as agreed by the Avient location to be audited for a routine audit Standard handling time frame: 1 Business Day to confirm receipt and r .ecord it in our system 15 Business days to analyze problem, provide root cause and action plan. 30 days to close complaint http://www.avient.com/company/sustainability/environmental/global-iso-certificate-library 8 The overall processing times may vary depending on the complexity of the issue and resources needed. The record retention period for these records is three (3) years.

José Garibaldi 2401 1832 Lomas de Zamora Argentina Avient Austria GmbH Administration Alfred Feierfeilstraße 3 2380 Perchtoldsdorf Austria Avient Colorants Belgium SA Site management, CSD – Customer Services, Manufacture, Laboratory, Supply Chain Management, Maintenance, Infrastructure, Warehouse and Transport Parc Scientifique Fleming, Fond Jean Pâques 1 1348 Louvain-la-Neuve Belgium Avient Colorants Brasil Ltda. Central Office, Administration, Site management (Facitilities, EHS), Marketing and Sales, SCM, Group Procurement Services, GBS and Logistics, GTI-Engineering and R&D, Technical Application Laboratories, Legal, Finance, HR, IT, RSRA, SMD and Learning, Communication Bunkyo Green Court, 2-28-8, Tokyo Tokyo 113-8662 Japan Avient Colorants Malaysia Sdn Bhd Administration, Site management, Manufacture, Laboratory, Procurement, Maintenance, Infrastructure, Warehouse and Transport Lot 1732, MK. 15, Kaw. Page 3 of 4 https://abs.ez2xs.com https://abs.ez2xs.com Avient Colorants Thailand Ltd.

AVNT-2021.06.30-News Release 1 NEWS RELEASE FOR IMMEDIATE RELEASE Avient Announces Registration Details for December 9th Investor Day CLEVELAND – November 3, 2021 – Avient Corporation (NYSE: AVNT), a leading provider of specialized and sustainable material solutions, will host an Investor Day for investment professionals on Thursday, December 9, 2021, from 8:00 a.m. to 1:00 p.m., at the New York Marriott Marquis hotel.

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Avient Q1 2023 Earnings – May 3, 2023 Morgan Conference - 3/1/2022 Avient Q4 2021 Earnings - February 8, 2022

Avient Q1 2023 Earnings – May 3, 2023 Morgan Conference - 3/1/2022 Avient Q4 2021 Earnings - February 8, 2022