ASIA/PACIFIC: SDS for the Asia Pacific region can be obtained by contacting the appropriate regional office. EUROPE: SDS for Europe can be obtained by contacting the appropriate regional office. EUROPE: SDS for Europe can be obtained by contacting the appropriate regional office.

any underwriter or any dealer participating in the offering will arrange to send you the prospectus and the related prospectus supplement if you request it by contacting at (440)-930-1000 or by contacting Investor Contacts

ASIA/PACIFIC: SDS for the Asia Pacific region can be obtained by contacting the appropriate regional office. EUROPE: SDS for Europe can be obtained by contacting the appropriate regional office. EUROPE: SDS for Europe can be obtained by contacting the appropriate regional office.

ASIA/PACIFIC: SDS for the Asia Pacific region can be obtained by contacting the appropriate regional office. EUROPE: SDS for Europe can be obtained by contacting the appropriate regional office. EUROPE: SDS for Europe can be obtained by contacting the appropriate regional office.

Investor Relations Contact: Isaac D. Corporate Media Contact: Kyle G. Media Relations Contacts

HOME | Contents | Message from the CEO | About Us | People | Products | Planet | Performance | Metrics | Index Sustainability Report | 2022 91 https://www.avient.com/investors/governance https://www.avient.com/sites/default/files/2023-03/2023%20Avient%20Bookmarked%20Proxy%20Statement%20-%20FINAL.pdf https://www.avient.com/investors/governance https://www.avient.com/sites/default/files/2023-03/2023%20Avient%20Bookmarked%20Proxy%20Statement%20-%20FINAL.pdf https://www.avient.com/investors/governance https://www.avient.com/sites/default/files/2023-03/2023%20Avient%20Bookmarked%20Proxy%20Statement%20-%20FINAL.pdf https://www.avient.com/investors/governance https://www.avient.com/sites/default/files/2023-03/2023%20Avient%20Bookmarked%20Proxy%20Statement%20-%20FINAL.pdf https://www.avient.com/company/policies-and-governance/code-conduct https://www.avient.com/investors/governance https://www.avient.com/sites/default/files/2023-03/Avient%20Annual%20Report%202022.pdf https://www.avient.com/sites/default/files/2023-03/2023%20Avient%20Bookmarked%20Proxy%20Statement%20-%20FINAL.pdf https://www.avient.com/sites/default/files/2023-03/2023%20Avient%20Bookmarked%20Proxy%20Statement%20-%20FINAL.pdf https://www.avient.com/sites/default/files/2023-03/2023%20Avient%20Bookmarked%20Proxy%20Statement%20-%20FINAL.pdf https://www.avient.com/sites/default/files/2023-03/2023%20Avient%20Bookmarked%20Proxy%20Statement%20-%20FINAL.pdf https://www.avient.com/sites/default/files/2023-03/Avient%20Annual%20Report%202022.pdf GRI Standard Disclosure Title Avient Disclosures General Disclosures Reporting Practice 102–47 List of material topics People—Occupational Safety & Health; Management Approach: Training and Development; Management Approach: Diversity & Inclusion Page 21, 24, 27 Products—Management Approach: Product Stewardship; Management Approach: Supplier Collaboration Page 51, 54 Planet—Reducing Emissions; Waste: Preventing, Minimizing, Eliminating Pages 61, 63 Performance Overview Page 74 102–48 Restatements of information EHS Metrics includes estimated full year performance of APM acquisition 102–49 Changes in reporting No change 102–50 Reporting period January 1, 2022 through December 31, 2022 102–51 Date of most recent report This is Avient's 5th sustainability report. 102–52 Reporting cycle At minimum, biennial 102–53 Contact point for questions regarding the report https://www.avient.com/contact-us-now 102–54 Claims of reporting in accordance with the GRI standards This report has been prepared in accordance with the GRI Standards: Core Option Economic Topic Disclosures GRI 201: Economic 103-1, 2 and 3 Management approach – GRI 103 Performance—Performance Overview Page 74 201–1 Direct economic value generated and distributed Avient 2022 Annual Report—Form 10-K Pages 18–19 201–2 Financial implications and other risks and opportunities due to climate change Avient 2022 Annual Report—Form 10-K Page 9–10 Performance—Enterprise Risk Management (ERM) Page 79 Planet—Climate Change, Energy and Greenhouse Gas (GHG) Emissions Page 59 201-3 Defined benefit plan obligations and other retirement plans Avient 2022 Annual Report—Form 10-K Pages 24 & 41 GRI 205: Anti-Corruption 103-1, 2 and 3 Management approach – GRI 103 Performance—The Highest Ethical Standards Page 77 Avient Code of Conduct 205–1 Operations assessed for risks related to corruption Products—Management Approach: Supplier Collaboration Page 54 Performance—The Highest Ethical Standards; Enterprise Risk Management (ERM) Pages 77, 79 Avient Code of Conduct https://www.avient.com/investors/governance 205–2 Communication and training about anti-corruption policies and procedures Performance—The Highest Ethical Standards Page 77 Avient Code of Conduct https://www.avient.com/investors/governance 205–3 Confirmed incidents of corruption and actions taken There were no incidents of corruption in 2022. HOME | Contents | Message from the CEO | About Us | People | Products | Planet | Performance | Metrics | Index Sustainability Report | 2022 92 https://www.cdp.net/en https://www.avient.com/contact-us-now https://www.avient.com/sites/default/files/2023-03/Avient%20Annual%20Report%202022.pdf https://www.avient.com/sites/default/files/2023-03/Avient%20Annual%20Report%202022.pdf https://www.avient.com/sites/default/files/2023-03/Avient%20Annual%20Report%202022.pdf https://www.avient.com/company/policies-and-governance/code-conduct https://www.avient.com/company/policies-and-governance/code-conduct https://www.avient.com/investors/governance https://www.avient.com/company/policies-and-governance/code-conduct https://www.avient.com/investors/governance https://www.avient.com/company/policies-and-governance/code-conduct https://www.avient.com/investors/governance https://www.avient.com/company/policies-and-governance/code-conduct GRI Standard Disclosure Title Avient Disclosures Environmental Topic Disclosures GRI 301: Materials 301–1 Materials used by weight or volume About Avient—What We Do: Material Science Page 13 Avient 2022 Annual Report—Form 10-K Page 3 301–2 Recycled input materials used Products—How Our Products Enable Sustainability Page 44 301–3 Reclaimed products and their packaging materials Products—How Our Products Enable Sustainability Page 44 GRI 302: Energy 103–1, 2 and 3 Management approach—GRI 103 Planet—Protecting Our Planet; Climate Change Pages 58–59 https://www.avient.com/company/sustainability/planet/environmental-stewardship 302–1 Energy consumption within the organization Planet—Protecting Our Planet; Climate Change Pages 58–59 Metrics—Planet Data and Metrics Page 85 302–2 Energy consumption outside of the organization Planet—Protecting Our Planet; Climate Change Pages 58–59 Metrics—Planet Data and Metrics Page 85 302–3 Energy intensity Metrics—Planet Data and Metrics Page 85 Our energy intensity evaluates all energy usage within the organization. 302–4 Reduction of energy consumption Planet—Protecting Our Planet; Climate Change Pages 58–59 Metrics—Planet Data and Metrics Page 85 302–5 Reductions in energy requirements of products and services Products—How Our Products Enable Sustainability Page 44 Metrics—Planet Data and Metrics Page 85 GRI 303: Water and Effluents 303–1 Interactions with water as a shared resource Planet—Climate Change; Water Intensity and Biodiversity Pages 59, 66 https://www.avient.com/company/sustainability/planet/environmental-stewardship 303–3 Water withdrawal Planet—Climate Change; Water Intensity and Biodiversity Pages 59, 66 Metrics—Planet Data and Metrics Page 87 GRI 305: Emissions 103–1, 2 and 3 Management approach—GRI 103 Planet—Protecting Our Planet; Climate Change Pages 58, 59 Metrics—People and Planet Data and Metrics Page 84–87 305–1 Direct (Scope 1) GHG emissions Planet—Protecting Our Planet; Climate Change Pages 58, 59 Metrics—Planet Data and Metrics Page 86 305–2 Energy indirect (Scope 2) GHG emissions Planet—Protecting Our Planet; Climate Change Pages 58,59 Metrics—Planet Data and Metrics Page 86 305–3 Other indirect (Scope 3) GHG emissions Planet—Protecting Our Planet; Climate Change Pages 58, 59 Metrics—Planet Data and Metrics Page 86 305–4 GHG emissions intensity Planet—Protecting Our Planet; Climate Change Pages 58, 59 Metrics—Planet Data and Metrics Page 86 305–5 Reduction of GHG emissions Planet—Protecting Our Planet; Climate Change Pages 58, 59 Metrics—Planet Data and Metrics Page 86 305–7 Nitrogen oxides (NOX), sulfur oxides (SOX), and other significant air emissions Planet—Conventional Air Emissions Page 67 Metrics—Planet Data and Metrics Page 86 HOME | Contents | Message from the CEO | About Us | People | Products | Planet | Performance | Metrics | Index Sustainability Report | 2022 93 https://www.avient.com/sites/default/files/2023-03/Avient%20Annual%20Report%202022.pdf https://www.avient.com/company/sustainability/planet/environmental-stewardship https://www.avient.com/company/sustainability/planet/environmental-stewardship GRI Standard Disclosure Title Avient Disclosures Environmental Topic Disclosures GRI 306: Waste 103–1, 2 and 3 Management approach—GRI 103 Planet—Waste: All Sections Pages 63–64 https://www.avient.com/company/sustainability/planet/environmental-stewardship 306–1 Waste generation and significant waste-related impacts Planet—Waste: All Sections Pages 63–64 306–2 Management of significant waste-related impacts Planet—Waste: All Sections Pages 63–64 306–3 Waste generated Planet—Waste: All Sections Pages 63–64 Metrics—Planet Data and Metrics Page 86 306–4 Waste diverted from disposal Planet—Waste: All Sections Pages 63–64 Metrics—Planet Data and Metrics Page 86 306–5 Waste directed to disposal Planet—Waste: All Sections Pages 63–64 Metrics—Planet Data and Metrics Page 86 GRI 307: Environmental Compliance 103–1, 2 and 3 Management approach—GRI 103 People—Management Approach: EH&S Page 19 Products—Management Approach: Product Stewardship Page 51 Planet—Protecting Our Planet Page 58 Avient 2022 Annual Report—Form 10-K Pages 6–7 https://www.avient.com/company/sustainability/planet/environmental-stewardship 307–1 Non-compliance with environmental laws and regulations Products—Management Approach: Product Stewardship Page 51 Avient 2022 Annual Report—Form 10-K Pages 6–7 GRI 308: Supplier Environmental Assessment 103–1, 2 and 3 Management approach—GRI 103 Products—Management Approach: Supplier Collaboration Page 54 Avient Supplier Code of Conduct 308–1 New suppliers that were screened using environmental criteria Products—Management Approach: Supplier Collaboration Page 54 308–2 Negative environmental impacts in the supply chain and actions taken Products—Management Approach: Supplier Collaboration Page 54 Social Topic Disclosures GRI 401: Employment 103–1, 2 and 3 Management approach—GRI 103 People—Management Approach: Training and Development Page 24; Diversity & Inclusion: Leading from the Top Page 26; Management Approach: Diversity & Inclusion Page 27 401–1 New employee hires and employee turnover People—Workforce Demographics Page 31 We hired 1529 new associates in 2022 (this number includes our acquisition, APM). 401–2 Benefits provided to full-time employees that are not provided to temporary or part-time employees People—Associate Benefits / Awards and Recognition Program; Health and Wellness Pages 32, 34 401–3 Parental leave People—Health and Wellness Page 34 HOME | Contents | Message from the CEO | About Us | People | Products | Planet | Performance | Metrics | Index Sustainability Report | 2022 94 https://www.avient.com/company/sustainability/planet/environmental-stewardship https://www.avient.com/sites/default/files/2023-03/Avient%20Annual%20Report%202022.pdf https://www.avient.com/company/sustainability/planet/environmental-stewardship https://www.avient.com/sites/default/files/2023-03/Avient%20Annual%20Report%202022.pdf https://www.avient.com/company/policies-and-governance-0/supplier-code-conduct GRI Standard Disclosure Title Avient Disclosures Social Topic Disclosures GRI 403: Occupational Health & Safety 103–1, 2 and 3 Management approach—GRI 103 People—Management Approach: EH&S Page 19 Avient 2022 Annual Report—Form 10-K Pages 5–7 Avient's Position on Human Rights https://www.avient.com/company/sustainability/planet/environmental-stewardship 403–1 Occupational health and safety management system People—Management Approach: EH&S Page 19 Avient 2022 Annual Report—Form 10-K Pages 5–7 People—Occupational Safety & Health Page 21 https://www.avient.com/company/sustainability/planet/environmental-stewardship 403–2 Hazard identification, risk assessment, and incident investigation People—Management Approach: EH&S Page 19 https://www.avient.com/company/sustainability/planet/environmental-stewardship 403–3 Occupational health services People—Occupational Safety & Health Page 21 403–4 Worker participation, consultation, and communication on occupational health and safety People—Management Approach: EH&S Page 19 https://www.avient.com/company/sustainability/planet/environmental-stewardship 403–5 Worker training on occupational health and safety People—Management Approach: EH&S; People—Management Approach: Training and Development Pages 19, 24 403–6 Promotion of worker health People—Occupational Safety & Health; Health and Wellness Pages 21, 34 403–7 Prevention and mitigation of occupational health and safety impacts directly linked by business relationships People—Management Approach: EH&S Page 19 Products—Management Approach: Product Stewardship; Management Approach: Supplier Collaboration Pages 51, 54 Avient 2022 Annual Report—Form 10-K Pages 5–7 https://www.avient.com/company/sustainability/planet/environmental-stewardship 403–8 Workers covered by an occupational health and safety management system People—Management Approach: EH&S Page 19 Avient 2022 Annual Report—Form 10-K Pages 5–7 403–9 Work-related injuries People—Management Approach: EH&S Page 19 Avient 2022 Annual Report—Form 10-K Pages 5–7 Metrics—People and Planet Data and Metrics Pages 84–85 403–10 Work-related ill health People—Management Approach: EH&S Page 19 Avient 2022 Annual Report—Form 10-K Pages 5–7 Metrics—People and Planet Data and Metrics Pages 84–85 GRI 404: Training & Education 10–1, 2 and 3 Management approach—GRI 103 People—Management Approach: Training and Development Page 24 404–1 Average hours of training per year per employee People—Management Approach: Training and Development; Career Training and Performance Feedback Pages 24, 35 In 2022, associates received 142,000 hours of training through a variety of delivery methods.

• Among other responsibilities, the Non-Executive Chairman of the Board: • Chairs executive sessions of the non-employee Directors and provides feedback and perspective to the CEO regarding discussions at these sessions; • Facilitates communications between other members of the Board; • Approves meeting agendas and meeting schedules for the Board; • Communicates with the CEO regarding the quality, quantity and timeliness of the flow of information from management to the Board; • Interviews all Board candidates and provides the Governance and Corporate Responsibility Committee with recommendations on each candidate; • Maintains close contact with the Chair of each standing committee and assists in ensuring communications between each committee and the Board; • Considers the retention of advisers and consultants who report directly to the Board; and • Chairs Board meetings. The Consultant regularly attends Compensation Committee meetings, maintains regular contact with the Compensation Committee, and interacts with management to gather the data needed to prepare reports for Compensation Committee review. If you hold your shares through a bank, broker or other nominee, you must follow the instructions found on your voting instruction card, or contact your bank, broker or other nominee in order to revoke your previously delivered proxy, or participate in the Annual Meeting and vote electronically online during the Annual Meeting.

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Investor Relations - Joe Di Salvo, Vice President, Investor Relations, PolyOne Corporation, +1 440-930-1921, giuseppe.disalvo@avient.com; Media Contact - Kyle G. Investor Contacts

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