Color, Additives and Inks (CAI) Specialty Engineered Materials (SEM) 1. A majority of associates have full-time contracts. 102–9 Supply chain Avient 2023 Annual Report—Form 10-K Page 5 102–10 Significant changes to the organization and its supply chain Avient 2023 Annual Report—Form 10-K Page 18 102–11 Precautionary Principle or approach Avient 2023 Annual Report—Form 10-K Page 8–13 102–12 External initiatives About Us—Who We Are Page 11 People—Security, Becoming an Even Better Place to Work Page 22, Page 36 Products—Strategic Partnerships and Alliances Page 50 102–13 Membership of associations Strategic Partnerships and Alliances Page 50 102–14 Statement from senior decision-maker 2023 Sustainability Report—Message from the CEO Page 3 102–15 Key impacts, risks, and opportunities Avient 2023 Annual Report—Form 10-K Page 8–13 Innovating for a Sustainable Future Page 38 Ethics & Integrity 102–16 Values, principles, standards, and norms of behavior About Us—Who We Are Page 11 Avient 2023 Annual Report—Our Vision; Our Culture; Our Sustainability Guiding Principle and Four Cornerstones 102–17 Mechanisms for advice and concerns about ethics Performance—Ethics Hotline and Reporting Page 69 HOME | Contents | Message from the CEO | About Us | People | Products | Planet | Performance | Metrics | Index Sustainability Report | 2023 80 https://www.avient.com/products Governance 102–18 Governance structure Performance—Board of Directors Governance Page 71 People—Environmental, Health & Safety Page 18 Avient 2023 Annual Report—Form 10-K Pages 14–15 & 68 Avient 2024 Proxy Statement—Pages 14–15 102–20 Executive-level responsibility for economic, environmental, and social topics Performance—Board of Directors Governance Page 71 People—Environmental, Health & Safety Page 18 People—Training and Development Page 23 People—Diversity & Inclusion Page 24 Products—Product Stewardship Page 45 Products—Supplier Collaboration Page 48 102–22 Composition of the highest governance body and its committees Avient 2023 Annual Report—Form 10-K Pages 13–14, & 65 Performance—Board of Directors Governance Page 71 102–23 Chair of the highest governance body Avient 2024 Proxy Statement—Page 19 102–24 Nominating and selecting the highest governance body Avient 2023 Annual Report—Form 10-K Pages 13–14 Avient 2024 Proxy Statement—Page 16 102–25 Conflicts of interest 102–26 Role of highest governance body in setting purpose, values, and strategy Avient 2023 Annual Report—Form 10-K Pages 13–14 & 65 Avient 2024 Proxy Statement—Pages 29–31 102–27 Collective knowledge of highest governance body Performance—Board of Directors Governance Page 71 Avient 2024 Proxy Statement—Pages 14–16 102–28 Evaluating the highest governance body's performance Avient 2024 Proxy Statement—Pages 32–36 102–29 Identifying and managing economic, environmental, and social impacts 102–30 Effectiveness of risk management processes Performance—Enterprise Risk Management; Board of Directors Governance; Pages 70,71 Avient 2024 Proxy Statement—Pages 30–31 102–31 Review of economic, environmental, and social topics HOME | Contents | Message from the CEO | About Us | People | Products | Planet | Performance | Metrics | Index Sustainability Report | 2023 81 Governance 102–32 Highest governance body's role in sustainability reporting Message from the Governance and Corporate Responsibility Committee Page 4 Performance—Enterprise Risk Management; Board of Directors Governance; Pages 70,71 Avient 2024 Proxy Statement—Pages 30–31, 34 102–33 Communicating critical concerns Performance—Enterprise Risk Management; Board of Directors Governance; Pages 70,71 Avient Code of Conduct 102–34 Nature and total number of critical concerns Avient 2023 Annual Report—Form 10-K Pages 54–55 102–35 Remuneration Policies Avient 2024 Proxy Statement—Pages 49–57, 59–70 102–36 Process for determining remuneration Avient 2024 Proxy Statement—Pages 49–54 102–37 Stakeholders' involvement in remuneration Avient 2024 Proxy Statement—Pages 49–50 102–38 Annual total compensation ratio Avient 2024 Proxy Statement—Page 71 Stakeholder Engagement 102–40 List of stakeholder groups About Us—Engaging with Our Stakeholders Page 9 102–41 Collective bargaining agreements Workforce Demographics—Employee Representation Page 28 102–42 Identifying and selecting stakeholders About Us—Engaging with Our Stakeholders Page 9 102–43 Approach to stakeholder engagement About Us—Engaging with Our Stakeholders Page 9 102–44 Key topics and concerns raised About Us—Engaging with Our Stakeholders Page 9 Reporting Practice 102–45 Entities included in the consolidated financial statements Avient 2023 Annual Report—Form 10-K Pages 2–3 We operate in three reportable segments: (1) Color, Additives and Inks and (2) Specialty Engineered Materials 102–46 Defining report content and topic boundaries The information in this report applies to Avient and all owned facilities, joint ventures, and operating companies globally within the reporting period, unless otherwise stated.

Color, Additives and Inks (CAI) Specialty Engineered Materials (SEM) 1. A majority of associates have full-time contracts. 102–9 Supply chain Avient 2023 Annual Report—Form 10-K Page 5 102–10 Significant changes to the organization and its supply chain Avient 2023 Annual Report—Form 10-K Page 18 102–11 Precautionary Principle or approach Avient 2023 Annual Report—Form 10-K Page 8–13 102–12 External initiatives About Us—Who We Are Page 11 People—Security, Becoming an Even Better Place to Work Page 22, Page 36 Products—Strategic Partnerships and Alliances Page 50 102–13 Membership of associations Strategic Partnerships and Alliances Page 50 102–14 Statement from senior decision-maker 2023 Sustainability Report—Message from the CEO Page 3 102–15 Key impacts, risks, and opportunities Avient 2023 Annual Report—Form 10-K Page 8–13 Innovating for a Sustainable Future Page 38 Ethics & Integrity 102–16 Values, principles, standards, and norms of behavior About Us—Who We Are Page 11 Avient 2023 Annual Report—Our Vision; Our Culture; Our Sustainability Guiding Principle and Four Cornerstones 102–17 Mechanisms for advice and concerns about ethics Performance—Ethics Hotline and Reporting Page 69 HOME | Contents | Message from the CEO | About Us | People | Products | Planet | Performance | Metrics | Index Sustainability Report | 2023 80 https://www.avient.com/products Governance 102–18 Governance structure Performance—Board of Directors Governance Page 71 People—Environmental, Health & Safety Page 18 Avient 2023 Annual Report—Form 10-K Pages 14–15 & 68 Avient 2024 Proxy Statement—Pages 14–15 102–20 Executive-level responsibility for economic, environmental, and social topics Performance—Board of Directors Governance Page 71 People—Environmental, Health & Safety Page 18 People—Training and Development Page 23 People—Diversity & Inclusion Page 24 Products—Product Stewardship Page 45 Products—Supplier Collaboration Page 48 102–22 Composition of the highest governance body and its committees Avient 2023 Annual Report—Form 10-K Pages 13–14, & 65 Performance—Board of Directors Governance Page 71 102–23 Chair of the highest governance body Avient 2024 Proxy Statement—Page 19 102–24 Nominating and selecting the highest governance body Avient 2023 Annual Report—Form 10-K Pages 13–14 Avient 2024 Proxy Statement—Page 16 102–25 Conflicts of interest 102–26 Role of highest governance body in setting purpose, values, and strategy Avient 2023 Annual Report—Form 10-K Pages 13–14 & 65 Avient 2024 Proxy Statement—Pages 29–31 102–27 Collective knowledge of highest governance body Performance—Board of Directors Governance Page 71 Avient 2024 Proxy Statement—Pages 14–16 102–28 Evaluating the highest governance body's performance Avient 2024 Proxy Statement—Pages 32–36 102–29 Identifying and managing economic, environmental, and social impacts 102–30 Effectiveness of risk management processes Performance—Enterprise Risk Management; Board of Directors Governance; Pages 70,71 Avient 2024 Proxy Statement—Pages 30–31 102–31 Review of economic, environmental, and social topics HOME | Contents | Message from the CEO | About Us | People | Products | Planet | Performance | Metrics | Index Sustainability Report | 2023 81 Governance 102–32 Highest governance body's role in sustainability reporting Message from the Governance and Corporate Responsibility Committee Page 4 Performance—Enterprise Risk Management; Board of Directors Governance; Pages 70,71 Avient 2024 Proxy Statement—Pages 30–31, 34 102–33 Communicating critical concerns Performance—Enterprise Risk Management; Board of Directors Governance; Pages 70,71 Avient Code of Conduct 102–34 Nature and total number of critical concerns Avient 2023 Annual Report—Form 10-K Pages 54–55 102–35 Remuneration Policies Avient 2024 Proxy Statement—Pages 49–57, 59–70 102–36 Process for determining remuneration Avient 2024 Proxy Statement—Pages 49–54 102–37 Stakeholders' involvement in remuneration Avient 2024 Proxy Statement—Pages 49–50 102–38 Annual total compensation ratio Avient 2024 Proxy Statement—Page 71 Stakeholder Engagement 102–40 List of stakeholder groups About Us—Engaging with Our Stakeholders Page 9 102–41 Collective bargaining agreements Workforce Demographics—Employee Representation Page 28 102–42 Identifying and selecting stakeholders About Us—Engaging with Our Stakeholders Page 9 102–43 Approach to stakeholder engagement About Us—Engaging with Our Stakeholders Page 9 102–44 Key topics and concerns raised About Us—Engaging with Our Stakeholders Page 9 Reporting Practice 102–45 Entities included in the consolidated financial statements Avient 2023 Annual Report—Form 10-K Pages 2–3 We operate in three reportable segments: (1) Color, Additives and Inks and (2) Specialty Engineered Materials 102–46 Defining report content and topic boundaries The information in this report applies to Avient and all owned facilities, joint ventures, and operating companies globally within the reporting period, unless otherwise stated.

Garratt Former Senior Vice President, President of Color, Additives and Inks, EMEA Leadership Transitions. Total attainment for our Color, Additives and Inks ("CAI") business segment under the 2024 Annual Incentive Program was 176.5%, with the components consisting of (dollars in millions): PROXY STATEMENT 2025 | Annual Meeting of Shareholders 50 2024 CAI Plan Annual Incentive Program* (Garratt) Adjusted Operating Income (CAI) 59.5% $269.8 $289.3 $308.4 $303.1 172.1% Adjusted Operating 10.5% $312.7 $330.0 $347.3 $350.7 200% Working Capital as a % of Sales (CAI) 20.0% 11.7% 11.3% 10.9% 10.9% 190.5% Sustainability See above disclosure for more information about Total Attainment 176.5% *Adjusted operating income (performance measures and results) reported in the table above was calculated with adjustments for foreign exchange (as noted on Appendix A) pursuant to the terms of the awards and as approved by the Compensation Committee.

Color, Additives and Inks (CAI) Distribution Specialty Engineered Materials 1. A majority of our associates have full time contracts. 102–9 Supply chain Avient 2021 Annual Report—Form 10-K Page 5 102–10 Significant changes to the organization and its supply chain Avient 2021 Annual Report—Form 10-K Page 18 102–11 Precautionary Principle or approach Avient 2021 Annual Report—Form 10-K Pages 8–12 102–12 External initiatives About Avient—Who We Are People—Security; A Great Place to Work Products—Strategic Partnerships and Alliances 102–13 Membership of associations United Nations Global Compact American Chemistry Council Alliance To End Plastic Waste Operation Clean Sweep UK Plastics Pact PetCore Europe Association of Plastic Recyclers (APR) Plastics Recyclers Europe (PRE) Responsible Mica Initiative (RMI) Microfibre Consortium (TMC) 102–14 Statement from senior decision-maker Message from the CEO 102–15 Key impacts, risks, and opportunities Products—Innovation: The Lifeblood of a Specialty Organization Avient 2021 Annual Report—Form 10-K Pages 8–12 Ethics & Integrity 102–16 Values, principles, standards, and norms of behavior About Us—Who We Are Avient 2021 Annual Report—Creating a World-Class, Sustainable; Vision and Strategy Sustainability Report | 2021 89 https://endplasticwaste.org https://www.newplasticseconomy.org/projects/plastics-pact https://www.petcore-europe.org https://plasticsrecycling.org https://www.plasticsrecyclers.eu/who-we-are https://responsible-mica-initiative.com https://www.microfibreconsortium.com Ethics & Integrity 102–17 Mechanisms for advice and concerns about ethics Performance—Ethics Hotline and Reporting Governance 102–18 Governance structure Performance—Board of Directors Governance People—Management Approach: EH&S Avient 2021 Annual Report—Form 10-K Pages 14–15 & 70 and Proxy Statement Pages 13–15 102–20 Executive-level responsibility for economic, environmental, and social topics Performance—Board of Directors Governance People—Management Approach: Training and Development People—Management Approach: Diversity & Inclusion 102–22 Composition of the highest governance body and its committees Avient 2021 Annual Report—Form 10-K Pages 14–15 & 70 Avient Governance—Board of Directors 102–23 Chair of the highest governance body Avient 2022 Proxy Statement Pages 21, 29 102–24 Nominating and selecting the highest governance body Avient 2021 Annual Report—Form 10-K Pages 14–15 & 70 and Proxy Statement Pages 30–31 102–25 Conflicts of interest 102–26 Role of highest governance body in setting purpose, values, and strategy Avient 2021 Annual Report—Form 10-K Pages 14–15 & 70 and Proxy Statement Pages 30–31 102–27 Collective knowledge of highest governance body Performance—Board of Directors Governance Avient 2022 Proxy Statement Pages 13–15 102–28 Evaluating the highest governance body's performance Avient 2022 Proxy Statement Pages 32, 34 102–29 Identifying and managing economic, environmental, and social impacts 102–30 Effectiveness of risk management processes Performance—Board of Directors Governance; Enterprise Risk Management (ERM) Avient 2022 Proxy Statement Pages 29–30 Sustainability Report | 2021 90 Governance 102–31 Review of economic, environmental, and social topics Performance—Board of Directors Governance; Enterprise Risk Management (ERM) Avient 2022 Proxy Statement Pages 30–31, 34 102–32 Highest governance body's role in sustainability reporting Message from the Governance and Corporate Responsibility Committee Avient 2022 Proxy Statement Pages 30–31, 34 102–33 Communicating critical concerns Avient 2022 Proxy Statement Pages 30–32, 34 Code of Conduct 102–34 Nature and total number of critical concerns Avient 2021 Annual Report—Form 10-K Pages 56–57 102–35 Renumeration Policies Avient 2022 Proxy Statement Pages 33–39, 49–58 102–36 Process for determining renumeration Avient 2022 Proxy Statement Pages 33–39 102–37 Stakeholders' involvement in renumeration Avient 2022 Proxy Statement Page 33–34 102–38 Annual total compensation ratio Avient 2022 Proxy Statement Page 70 Stakeholder Engagement 102–40 List of stakeholder groups Engaging with Stakeholders 102–41 Collective bargaining agreements People—Workforce Demographics Employee Representation 102–42 Identifying and selecting stakeholders Engaging with Stakeholders 102–43 Approach to stakeholder engagement Engaging with Stakeholders 102–44 Key topics and cocnerns raised Engaging with Stakeholders Reporting Practice 102–45 Entities included in the consolidated financial statements Avient 2021 Annual Report—Form 10-K Page 3 We operate in three reportable segments: (1) Color, Additives and Inks; (2) Specialty Engineered Materials; and (3) Distribution. 102–46 Defining report content and topic boundaries The information in this report applies to Avient and all owned facilities, joint ventures, and operating companies globally within the reporting period, unless otherwise stated.

Color, Additives and Inks (CAI) Specialty Engineered Materials (SEM) 1. A majority of associates have full-time contracts. 102–9 Supply chain Avient 2023 Annual Report—Form 10-K Page 5 102–10 Significant changes to the organization and its supply chain Avient 2023 Annual Report—Form 10-K Page 18 102–11 Precautionary Principle or approach Avient 2023 Annual Report—Form 10-K Page 8–13 102–12 External initiatives About Us—Who We Are Page 11 People—Security, Becoming an Even Better Place to Work Page 22, Page 36 Products—Strategic Partnerships and Alliances Page 50 102–13 Membership of associations Strategic Partnerships and Alliances Page 50 102–14 Statement from senior decision-maker 2023 Sustainability Report—Message from the CEO Page 3 102–15 Key impacts, risks, and opportunities Avient 2023 Annual Report—Form 10-K Page 8–13 Innovating for a Sustainable Future Page 38 Ethics & Integrity 102–16 Values, principles, standards, and norms of behavior About Us—Who We Are Page 11 Avient 2023 Annual Report—Our Vision; Our Culture; Our Sustainability Guiding Principle and Four Cornerstones 102–17 Mechanisms for advice and concerns about ethics Performance—Ethics Hotline and Reporting Page 69 HOME | Contents | Message from the CEO | About Us | People | Products | Planet | Performance | Metrics | Index Sustainability Report | 2023 80 https://www.avient.com/products Governance 102–18 Governance structure Performance—Board of Directors Governance Page 71 People—Environmental, Health & Safety Page 18 Avient 2023 Annual Report—Form 10-K Pages 14–15 & 68 Avient 2024 Proxy Statement—Pages 14–15 102–20 Executive-level responsibility for economic, environmental, and social topics Performance—Board of Directors Governance Page 71 People—Environmental, Health & Safety Page 18 People—Training and Development Page 23 People—Diversity & Inclusion Page 24 Products—Product Stewardship Page 45 Products—Supplier Collaboration Page 48 102–22 Composition of the highest governance body and its committees Avient 2023 Annual Report—Form 10-K Pages 13–14, & 65 Performance—Board of Directors Governance Page 71 102–23 Chair of the highest governance body Avient 2024 Proxy Statement—Page 19 102–24 Nominating and selecting the highest governance body Avient 2023 Annual Report—Form 10-K Pages 13–14 Avient 2024 Proxy Statement—Page 16 102–25 Conflicts of interest 102–26 Role of highest governance body in setting purpose, values, and strategy Avient 2023 Annual Report—Form 10-K Pages 13–14 & 65 Avient 2024 Proxy Statement—Pages 29–31 102–27 Collective knowledge of highest governance body Performance—Board of Directors Governance Page 71 Avient 2024 Proxy Statement—Pages 14–16 102–28 Evaluating the highest governance body's performance Avient 2024 Proxy Statement—Pages 32–36 102–29 Identifying and managing economic, environmental, and social impacts 102–30 Effectiveness of risk management processes Performance—Enterprise Risk Management; Board of Directors Governance; Pages 70,71 Avient 2024 Proxy Statement—Pages 30–31 102–31 Review of economic, environmental, and social topics HOME | Contents | Message from the CEO | About Us | People | Products | Planet | Performance | Metrics | Index Sustainability Report | 2023 81 Governance 102–32 Highest governance body's role in sustainability reporting Message from the Governance and Corporate Responsibility Committee Page 4 Performance—Enterprise Risk Management; Board of Directors Governance; Pages 70,71 Avient 2024 Proxy Statement—Pages 30–31, 34 102–33 Communicating critical concerns Performance—Enterprise Risk Management; Board of Directors Governance; Pages 70,71 Avient Code of Conduct 102–34 Nature and total number of critical concerns Avient 2023 Annual Report—Form 10-K Pages 54–55 102–35 Remuneration Policies Avient 2024 Proxy Statement—Pages 49–57, 59–70 102–36 Process for determining remuneration Avient 2024 Proxy Statement—Pages 49–54 102–37 Stakeholders' involvement in remuneration Avient 2024 Proxy Statement—Pages 49–50 102–38 Annual total compensation ratio Avient 2024 Proxy Statement—Page 71 Stakeholder Engagement 102–40 List of stakeholder groups About Us—Engaging with Our Stakeholders Page 9 102–41 Collective bargaining agreements Workforce Demographics—Employee Representation Page 28 102–42 Identifying and selecting stakeholders About Us—Engaging with Our Stakeholders Page 9 102–43 Approach to stakeholder engagement About Us—Engaging with Our Stakeholders Page 9 102–44 Key topics and concerns raised About Us—Engaging with Our Stakeholders Page 9 Reporting Practice 102–45 Entities included in the consolidated financial statements Avient 2023 Annual Report—Form 10-K Pages 2–3 We operate in three reportable segments: (1) Color, Additives and Inks and (2) Specialty Engineered Materials 102–46 Defining report content and topic boundaries The information in this report applies to Avient and all owned facilities, joint ventures, and operating companies globally within the reporting period, unless otherwise stated.

Van Hulle Senior Vice President, President of Color, Additives and Inks (“CAI”) Michael A. Van Hulle, Senior Vice President, President of Global Color, Additives and Inks Craig M.

Business division Scope 1 emissions (metric ton CO2e) Row 1 Avient Corporate 4275.031 193 Business division Scope 1 emissions (metric ton CO2e) Row 2 Global Color, Additives and Inks 3326.306 Row 3 Global Specialty Engineered Materials 20944.881 Row 4 Masterbatch 4568.055 [Add row] (7.20.1) Break down your total gross global Scope 2 emissions by business division. Business division Scope 2, location-based (metric tons CO2e) Scope 2, market-based (metric tons CO2e) Row 1 Global Specialty Engineered Materials 77222.88 11881.935 Row 2 Masterbatch 48395.149 39583.063 Row 3 Avient Corporate 5088.903 428.036 Row 4 Global Color, Additives and Inks 28316.537 21083.423 [Add row] (7.22) Break down your gross Scope 1 and Scope 2 emissions between your consolidated accounting group and other entities included in your response.