5) Adjusted EPS is calculated as net income, adjusted for special items (as noted in Appendix A), divided by weighted-average diluted shares. PROXY STATEMENT 2023 | Annual Meeting of Shareholders 73 Net Income versus Compensation Actually Paid First PEO Second PEO Average Non-PEO Named Executive Officer Net Income Net Income versus Compensation Actually Paid. A-1 December 31, 2022 Reconciliation of Pro Forma Adjusted Earnings per Share Net income from continuing operations attributable to Avient shareholders $ 82.8 Special items, after tax 116.2 Amortization expense, after-tax 49.0 Adjusted net income from continuing operations excluding special items 248.0 APM pro forma adjustments to net income from continuing operations* 13.6 APM amortization expense, after tax* 19.1 Pro forma adjusted net income from continuing operations attributable to Avient shareholders $ 280.7 Weighted average diluted shares 92.2 Pro forma adjusted EPS - excluding special items $ 3.04 (*) Pro forma adjustment for 2022 is for the 8 months January - August 2022 APM results (period before Avient ownership) including the impacts of debt financing and prepayments on net income from continuing operations.

The PCR content is derived from end-of-life fishing nets that could otherwise contribute to ocean plastic.

Avient is excited to reaffirm our commitment this year,” said Bob Patterson, Chairman, President and CEO, Avient Corporation, “We remain focused on these SDGs and aligning our activities accordingly.” The importance of building diverse and inclusive organizations has never been more important—in business and in our world,” said Bob Patterson, Chairman, President and CEO, Avient. Year Ended December 31, 2020 Year Ended December 31, 2019 Reconciliation of Pro Forma Adjusted Earnings per Share Avient Special Items(1) Adjusted Avient Clariant MB Pro Forma Adjustments(2) Pro Forma Adjusted Avient Avient Special Items(1) Adjusted Avient Clariant MB Pro Forma Adjustments(2) Pro Forma Adjusted Avient Sales $ 3,242.1 $ — $ 3,242.1 $ 540.4 $ 3,782.5 $ 2,862.7 $ — $ 2,862.7 $ 1,118.6 $ 3,981.3 Operating income $ 189.3 $ 73.7 $ 263.0 $ 45.0 $ 308.0 $ 156.8 $ 71.7 $ 228.5 $ 72.9 $ 301.4 Interest expense, net (74.6) 10.1 (64.5) (18.1) (82.6) (59.5) — (59.5) (33.4) (92.9) Other income, net 24.3 (17.6) 6.7 — 6.7 12.1 (10.0) 2.1 — 2.1 Income taxes (5.2) (41.4) (46.6) (6.2) (52.8) (33.7) (5.9) (39.6) (9.1) (48.7) Net income attributable to noncontrolling interests (1.8) — (1.8) — (1.8) (0.2) — (0.2) — (0.2) Net income from continuing operations attributable to Avient shareholders $ 132.0 $ 24.8 $ 156.8 $ 20.7 $ 177.5 $ 75.5 $ 55.8 $ 131.3 $ 30.4 $ 161.7 Weighted average diluted shares 90.6 77.7 Impact to diluted shares from January 2020 equity offering 1.5 15.3 Pro forma weighted average diluted shares 92.1 93.0 Pro forma adjusted EPS $ 1.93 $ 1.74 Year Ended December 31, 2021 Reconciliation of Adjusted Earnings per Share: Avient Special Items(1) Adjusted Avient Sales $ 4,818.8 $ — $ 4,818.8 Operating income $ 381.2 $ 47.8 $ 429.0 Interest expense, net (75.3) — (75.3) Other income, net (1.3) 9.3 8.0 Income taxes (74.0) (7.1) (81.1) Net income attributable to noncontrolling interests 0.2 — 0.2 Net income from continuing operations attributable to Avient shareholders $ 230.8 $ 50.0 $ 280.8 Weighted average diluted shares 92.1 Adjusted EPS - excluding special items $ 3.05 (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

5) Adjusted EPS is calculated as net income, adjusted for special items (as noted in Appendix A), divided by weighted-average diluted shares. A-1 December 31, Reconciliation of Pro Forma Adjusted Earnings per Share 2022 2021 Net (loss) income from continuing operations attributable to Avient shareholders $ 82.8 $ 151.8 Special items, after tax 116.2 50.0 Amortization expense, after-tax 49.0 44.9 Adjusted net income from continuing operations excluding special items 248.0 246.7 APM pro forma adjustments to net income from continuing operations* 13.6 9.9 APM amortization expense, after tax* 19.1 21.1 Pro forma adjusted net income from continuing operations attributable to Avient shareholders $ 280.7 $ 277.7 Weighted average diluted shares 92.2 92.1 Pro forma adjusted EPS - excluding special items $ 3.04 $ 3.02 (*) Pro forma adjustment for 2022 is for the 8 months January - August 2022 APM results (period before Avient ownership) including the impacts of debt financing and prepayments on net income from continuing operations. 2021 pro forma includes the full 12 month impact for the year ended December 31, 2021. Free Cash Flow Calculation Cash provided by operating activities $ 398.4 Capital expenditures (105.5) Free Cash Flow $ 292.9 Reconciliation of Net Debt Short-term and current portion of long term debt $ 2.2 Total long-term debt, net 2,176.7 Unamortized discount and debt issuance cost 37.4 Total debt $ 2.216.3 Cash (641.1) Net taxes due from sale of business 105.0 Adjusted cash $ (536.1) Net debt $ 1,680.2 Reconciliation to EBITDA and Adjusted EBITDA Net (loss) income from continuing operations – GAAP 83.1 Income tax (benefit) expense (19.3) Interest expense 119.8 Depreciation and amortization from continuing operations 162.5 EBITDA $ 346.1 Special items, before income tax 194.0 Interest expense included in special items (26.0) Depreciation and amortization included in special items (5.5) APM pro forma adjustments - 8 months 2022* 83.1 Adjusted EBITDA $ 591.7 (*) Pro forma adjustment for January - August 2022 APM results (period before Avient ownership).

The importance of building diverse and inclusive organizations has never been more important—in business and in our world,” said Bob Patterson, Chairman, President and CEO, Avient.   Long-lasting insecticidal treated nets (LLINs) are a form of individual protection to fight malaria, but insecticide resistance threatens to undermine net effectiveness. Avient and IVCC created a new medium scale masterbatch production laboratory in China to support research and development into non-registered novel active ingredients for incorporation into long lasting treated nets.

Kunkle APPENDIX A 2009* 2010* 2011* 2012* 2013* 2014* 2015* 2016** 2017** 2018** 2018*** 2019*** Net income from continuing operations attributable to PolyOne common shareholders $106.7 $152.5 $153.4 $ 53.3 $ 94.0 $ 78.0 $144.6 $166.4 $173.5 $161.1 $ 87.7 $ 75.5 Joint venture equity earnings, after tax (19.0) (14.7) (3.7) — — — — — — — — — Special items, before tax(1) (48.7) 24.2 (48.1) 55.1 46.3 164.2 87.6 23.8 32.9 59.5 58.7 61.7 Special items, tax adjustments(1) (27.2) (96.7) (24.7) (18.9) (13.7) (73.7) (58.7) (15.9) (24.8) (25.3) (25.1) (5.9) Adjusted net income from continuing Adjusted net income from continuing operations attributable to PolyOne common shareholders $ 11.8 $ 65.3 $ 76.9 $ 89.5 $126.6 $168.5 $173.5 $174.3 $181.6 $195.3 $121.3 $131.3 Diluted shares 93.4 96.0 94.3 89.8 96.5 93.5 88.7 84.6 82.1 80.4 80.4 77.7 Adjusted EPS attributable to PolyOneAdjusted EPS attributable to PolyOne common shareholders $ 0.13 $ 0.68 $ 0.82 $ 1.00 $ 1.31 $ 1.80 $ 1.96 $ 2.06 $ 2.21 $ 2.43 $ 1.51 $ 1.69 Year Ended December 31, Reconciliation to Consolidated Statements of Income 2019 2018 Operating income - GAAP $ 156.8 $ 178.6 Special items in operating income (1) 71.7 42.4 Operating income adjusted $ 228.5 $ 221.0 APPENDIX B POLYONE CORPORATION 2020 EQUITY AND INCENTIVE COMPENSATION PLAN 1.

The non-GAAP financial measures include: adjusted EPS, earnings before interest, tax, depreciation and amortization (EBITDA), adjusted EBITDA, net debt, Specialty platform operating income, Specialty platform gross margin percentage, adjusted operating income, return on invested capital, net debt/ EBITDA, and the exclusion of corporate charges in certain calculations. Richardson Executive Vice President, Chief Financial Officer PolyOne Corporation Page 15 Track Record of Accelerated Growth Total Revenue Adjusted EPS Adjusted EBITDA $2,061 $2,506 $2,709 $2,861 $3,771 2009 2010 2011 2012 2013 ($ in millions, except EPS ) $105 $179 $202 $255 $344 2009 2010 2011 2012 2013 $0.13 $0.68 $0.82 $1.00 $1.31 2009 2010 2011 2012 2013 PolyOne Corporation Page 16 $0.31 $0.44 $0.20 $0.30 $0.40 Q1 2013 Q1 2014 Adjusted EPS $42 $60 $20 $40 $60 Q1 2013 Q1 2014 Specialty Operating Income ($ millions) Q1 2014 Financial Highlights  Growth momentum accelerates driven by specialty platform  Specialty segments and Distribution achieve record results  All segments increase operating income compared to prior year  Revenue grew 25% versus Q1 2013 +43% +42% $57 $79 $30 $60 $90 Q1 2013 Q1 2014 Adjusted Operating Income ($ millions) +39% PolyOne Corporation Page 17 Commitment to Operational Excellence 81% 96% 2006 2013 16.2% 10.9% 2006 2013 On-Time Delivery Working Capital % of Sales 5.0% 31.0% 2006 2013 Percent of Associates Trained in LSS  Three consecutive years – CFO Magazine Best Working Capital Management Program in the chemical industry World’s Best Business Process Excellence Program in 2012*  95 certified Black Belts  211 certified Green Belts  422 Project Leaders World’s Best “Start-up Program” for Lean Six Sigma Deployment in 2009* *Both awards received from International Quality and Productivity Center PolyOne Corporation Page 18 Debt Maturities & Pension Funding – 3/31/14 Net Debt / EBITDA* = 1.9x $48 $317 $600 $0 $100 $200 $300 $400 $500 $600 $700 $800 2015 2020 2023 Debt Maturities As of March 31, 2014 ($ millions) Coupon Rates: 7.500% 7.375% 5.250% *TTM 12/31/2013 ** includes US-qualified pension plans only 60% 100% 20% 30% 40% 50% 60% 70% 80% 90% 100% 2008 2014 Pension Funding** As of March 31, 2014 PolyOne Corporation Page 19 Free Cash Flow and Strong Balance Sheet Fund Investment / Shareholder Return $0.16 $0.20 $0.24 $0.32 $0.10 $0.20 $0.30 $0.40 2011 2012 2013 2014 Annual Dividend Expanding our sales, marketing, and technical capabilities Targets that expand our: • Specialty offerings • End market presence • Geographic footprint • Operating Margin Synergy opportunities Adjacent material solutions Repurchased 1.4 million shares in Q1 2014 Repurchased 6.4 million shares since April 2013  13.6 million shares are available for repurchase under the current authorization Organic Growth Acquisitions Share Repurchases Dividends  Investing in operational and LSS initiatives (including synergy capture) Manufacturing alignment PolyOne Corporation Page 20 3.07 3.05 1.81 1.45 1.82 1.54 0.85 3.15 1.17 1.69 0.00 0.50 1.00 1.50 2.00 2.50 3.00 3.50 4.00 0.91 PolyOne Valuation Aspirations PEG Ratio Comparison Represents $38 of share price upside Avg = 1.96 PolyOne Corporation Page 21 Innovating for the Future Dr.

Free cash flow use 2020– 2024 est. 30% 37% 6%27% Debt paydown Dividend payments Share buybacks M&A, other 15% CAGR Copyright © . 2024 62 Disciplined capital allocation PRIORITIZATION AND PHILOSHOPY Capex Expected annual spend between 3-5% of revenue to support investment in organic growth Dividends Increasing each year with underlying earnings growth Debt pay down Target net debt to adjusted EBITDA less than 2.5x Share repurchases Opportunistic buy backs M&A De-emphasized in near term; complement organic growth strategy with M&A over time, as needed Copyright © . 2024 63 Avient is a compelling investment thesis Ability to adapt & pivot to deliver results highly motivated team with track record of operational and commercial excellence Global reach with local touch customer-centric focus across continents and cultures to serve locally and win globally Innovation differentiation by hybridizing technologies to create platforms at scale aligned to high growth market segments and secular trends MARGIN EXPANSION and sustainable growth ORGANIC GROWTH complemented by M&A over time as needed Strong CASH GENERATION and EXECUTION Broad customer base and COMPETITIVE ADVANTAGE Reconciliation of Non-GAAP Financial Measures (Unaudited) (Dollars in millions, except for per share data) Below is a reconciliation of non-GAAP financial measures to their most directly comparable financial measures calculated and presented in accordance with GAAP. Year Ended December 31, Reconciliation to EBITDA and Adjusted EBITDA: 2006 2023 Sales $ 2,622.4 $ 3,142.8 Net income from continuing operations – GAAP $ 133.5 $ 76.3 Income tax expense 29.7 11.0 Interest expense, net 63.1 115.3 Depreciation and amortization from continuing operations 57.1 188.8 EBITDA from continuing operations 283.4 391.4 Special items, before tax (34.0) 114.6 Interest expense included in special items — (2.3) Depreciation and amortization included in special items — (1.9) JV - equity income (107.0) — Adjusted EBITDA $ 142.4 $ 501.8 Adjusted EBITDA as a percent of sales 5.4 % 16.0 % Avient Investor Day_Dec 2024_Wednesday morning edition.pdf Investor Day - Dec24 - Non-GAAP v4 12.03.24 545PM.pdf Attachment

Modest Net Debt to Adjusted EBITDA ratio of 2.1x (1) Adjusted Earnings Per Share, Adjusted Operating Income, Adjusted EBITDA and Net Debt to Adjusted EBITDA reported in this proxy statement differ from what is reported under United States Generally Accepted Accounting Principles (“GAAP”). Revenue represents business unit sales or total Company net trade sales to third parties Year Ended Year Ended December 31, 2015 December 31, 2014 Reconciliation to Condensed Consolidated Statements of Income $ EPS $ EPS Net income from continuing operations attributable to PolyOne shareholders $ 144.6 $ 1.63 $ 78.0 $ 0.83 Special items, after tax (1), (2) 28.9 0.33 90.5 0.97 Adjusted net income / EPS – excluding special items $ 173.5 $ 1.96 $ 168.5 $ 1.80 Year Ended Year Ended December 31, 2013 December 31, 2012 Reconciliation to Condensed Consolidated Statements of Income $ EPS $ EPS Net income from continuing operations attributable to PolyOne shareholders $ 94.0 $ 0.97 $ 53.3 $ 0.59 Special items, after tax (1), (2) 32.6 0.34 36.2 0.41 Adjusted net income / EPS – excluding special items $ 126.6 $ 1.31 $ 89.5 $ 1.00 Year Ended December 31, 2011 Reconciliation to Condensed Consolidated Statements of Income $ EPS Net income from continuing operations attributable to PolyOne shareholders $ 153.4 $ 1.63 Special items, after tax (1), (2) (72.8) (0.77) SunBelt equity earnings, after tax (3.7) (0.04) Adjusted net income / EPS – excluding special items and Sunbelt equity earnings $ 76.9 $ 0.82 (1) Special items are a non-GAAP financial measure and are used to determine adjusted earnings.

5) Adjusted EPS is calculated as net income, adjusted for special items (as noted in Appendix A), divided by weighted-average diluted shares. Net Income versus Compensation Actually Paid First PEO Second PEO Average Non-PEO Named Executive Officer Net Income Net Income versus Compensation Actually Paid. Net income includes the income from discontinued operations, and for 2022 includes a one time $550 million gain on the sale of our Distribution business.