Common shares represented by a properly signed proxy card will be voted in accordance with the choices marked on the card. If no choices are marked, the shares will be voted FOR the: (1) election of twelve Director nominees to our Board; (2) approval, on an advisory basis, of Named Executive Officer compensation; (3) approval, on an advisory basis, of the frequency of future advisory votes to approve Named Executive Officer compensation; (4) approval of the amendment and restatement of the Avient Corporation 2020 Equity and Incentive Compensation Plan; and (5) ratification of the appointment of Ernst & Young LLP ("EY") as our independent registered public accounting firm for the fiscal year ending December 31, 2023. Year Ended December 31, 2022 2021 2020 Net income from continuing operations attributable to Avient shareholders $ 82.8 $ 151.8 $71.0 Special items, after tax(1) 116.2 50.0 24.8 Amortization expense, after-tax 49.0 44.9 33.6 Adjusted net income / EPS $ 248.0 $ 246.7 $ 129.4 Diluted Shares 92.2 92.1 90.6 Adjusted EPS attributable to Avient common shareholders from continuing operations $ 2.69 $ 2.68 $ 1.43 (1) Special items include charges related to specific strategic initiatives or financial restructuring such as: consolidation of operations; debt extinguishment costs; costs incurred directly in relation to acquisitions or divestitures; employee separation costs resulting from personnel reduction programs, plant realignment costs, executive separation agreements; asset impairments; settlement gains or losses and mark-to-market adjustments associated with actuarial gains and losses on pension and other post-retirement benefit plans; environmental remediation costs, fines, penalties and related insurance recoveries related to facilities no longer owned or closed in prior years; gains and losses on the divestiture of operating businesses, joint ventures and equity investments; gains and losses on facility or property sales or disposals; results of litigation, fines or penalties, where such litigation (or action relating to the fines or penalties) arose prior to the commencement of the performance period; one-time, non-recurring items; and the effect of changes in accounting principles or other such laws or provisions affecting reported results.

Adjusted EBITDA is calculated as follows: As of December 31, 2019 Sales Operating Income Depreciation & Amortization Adjusted EBITDA Legacy Color, Additives and Inks $ 1,003.8 $ 147.4 $ 43.2 $ 190.6 Specialty Engineered Materials 745.7 83.7 29.5 113.2 Distribution 1,192.2 75.4 0.5 75.9 Corporate and Eliminations (79.0) (149.7) 4.9 (144.8) Total $ 2,862.7 $ 156.8 $ 78.1 $ 234.9 Special items, before tax (1) 61.7 Other income, net 12.1 Net income attributable to non-controlling interests (0.2) Legacy Avient Total $ 2,862.7 $ 156.8 $ 78.1 $ 308.5 Clariant Masterbatch $ 1,123.1 $ 65.9 $ 24.3 $ 90.2 Special items, before tax (1) 43.3 Net income attributable to non-controlling interests (0.6) Clariant Masterbatch Total $ 1,123.1 $ 65.9 $ 24.3 $ 132.9 Avient Pro Forma Total $ 3,985.8 $ 222.7 $ 102.4 $ 441.4 (1) Special items include charges related to specific strategic initiatives or financial restructuring such as: consolidation of operations; debt extinguishment costs; costs incurred directly in relation to acquisitions or divestitures, including adjustments related to contingent consideration; employee separation costs resulting from personnel reduction programs, plant realignment costs, executive separation agreements; asset impairments; mark-to- market adjustments associated with actuarial gains and losses on pension and other post-retirement benefit plans; environmental remediation costs, fines, penalties and related insurance recoveries related to facilities no longer owned or closed in prior years; gains and losses on the divestiture of operating businesses, joint ventures and equity investments; gains and losses on facility or property sales or disposals; results of litigation, fines or penalties, where such litigation (or action relating to the fines or penalties) arose prior to the commencement of the performance period; one-time, non- recurring items; and the effect of changes in accounting principles or other such laws or provisions affecting reported results.

Adjusted EBITDA is calculated as follows: As of December 31, 2019 Sales Operating Income Depreciation & Amortization Adjusted EBITDA Legacy Color, Additives and Inks $ 1,003.8 $ 147.4 $ 43.2 $ 190.6 Specialty Engineered Materials 745.7 83.7 29.5 113.2 Distribution 1,192.2 75.4 0.5 75.9 Corporate and Eliminations (79.0) (149.7) 4.9 (144.8) Total $ 2,862.7 $ 156.8 $ 78.1 $ 234.9 Special items, before tax (1) 61.7 Other income, net 12.1 Net income attributable to non-controlling interests (0.2) Legacy Avient Total $ 2,862.7 $ 156.8 $ 78.1 $ 308.5 Clariant Masterbatch $ 1,123.1 $ 65.9 $ 24.3 $ 90.2 Special items, before tax (1) 43.3 Net income attributable to non-controlling interests (0.6) Clariant Masterbatch Total $ 1,123.1 $ 65.9 $ 24.3 $ 132.9 Avient Pro Forma Total $ 3,985.8 $ 222.7 $ 102.4 $ 441.4 (1) Special items include charges related to specific strategic initiatives or financial restructuring such as: consolidation of operations; debt extinguishment costs; costs incurred directly in relation to acquisitions or divestitures, including adjustments related to contingent consideration; employee separation costs resulting from personnel reduction programs, plant realignment costs, executive separation agreements; asset impairments; mark-to- market adjustments associated with actuarial gains and losses on pension and other post-retirement benefit plans; environmental remediation costs, fines, penalties and related insurance recoveries related to facilities no longer owned or closed in prior years; gains and losses on the divestiture of operating businesses, joint ventures and equity investments; gains and losses on facility or property sales or disposals; results of litigation, fines or penalties, where such litigation (or action relating to the fines or penalties) arose prior to the commencement of the performance period; one-time, non- recurring items; and the effect of changes in accounting principles or other such laws or provisions affecting reported results.

This publication contains information developed by Sustainalytics (www.sustainalytics.com). (2) The use by Avient of any MSCI ESG Research LLC or its affiliates (“MSCI”) data, and the use of MSCI logos, trademarks, service marks of index names herein, do not constitute a sponsorship, endorsement, recommendation, or promotion of Avient by MSCI.

This publication contains information developed by Sustainalytics (www.sustainalytics.com). (2) The use by Avient of any MSCI ESG Research LLC or its affiliates (“MSCI”) data, and the use of MSCI logos, trademarks, service marks of index names herein, do not constitute a sponsorship, endorsement, recommendation, or promotion of Avient by MSCI. (3) For more information on Avient’s recommitment to the UN Global Compact and alignment with UN Sustainable Development Goals, see page 11. 22nd PERCENTILE in Specialty Chemicals ENVIRONMENTAL SOCIAL GOVERNANCE Quality Score 1 4 2 Sustainability Report | 2024 14Contents | About Avient | Message from the CEO | Sustainability at Avient | Enabling a Sustainable World | Preserving the Planet | Culture of Safety & Sustainability | Governance | Appendix https://ecovadis.com/suppliers/ https://www.cdp.net https://unglobalcompact.org/ https://responsiblecare.americanchemistry.com/Guiding-Principles/ https://rankings.newsweek.com/americas-most-responsible-companies-2025 https://rankings.newsweek.com/americas-greenest-companies-2025 https://www.barrons.com/lists-rankings/top-sustainable-companies?

This publication contains information developed by Sustainalytics (www.sustainalytics.com). (2) The use by Avient of any MSCI ESG Research LLC or its affiliates (“MSCI”) data, and the use of MSCI logos, trademarks, service marks of index names herein, do not constitute a sponsorship, endorsement, recommendation, or promotion of Avient by MSCI.

Number of initiatives Total estimated annual CO2e savings in metric tonnes CO2e (only for rows marked *) Under investigation 0 0 To be implemented* 17 3,111.3 Implementation commenced* 51 189.2 Implemented* 207 5,458 Not to be implemented 0 0 C4.3b (C4.3b) Provide details on the initiatives implemented in the reporting year in the table below.

This publication contains information developed by Sustainalytics (www.sustainalytics.com). (2) The use by Avient of any MSCI ESG Research LLC or its affiliates (“MSCI”) data, and the use of MSCI logos, trademarks, service marks of index names herein, do not constitute a sponsorship, endorsement, recommendation, or promotion of Avient by MSCI.

Number of initiatives Total estimated annual CO2e savings in metric tonnes CO2e (only for rows marked *) Under investigation 0 `Numeric input To be implemented 0 0 Implementation commenced 22 1469.57 Implemented 96 2868.6 Not to be implemented 0 `Numeric input [Fixed row] (7.55.2) Provide details on the initiatives implemented in the reporting year in the table below.