Ashish Khandpur President and CEO December 18, 2023

Bob Patterson Chairman, President, and CEO February 2, 2022

NOTICE OF 2020 ANNUAL MEETING OF SHAREHOLDERS AND PROXY STATEMENT PolyOne Corporation PROPOSAL 1 — ELECTION OF BOARD OF DIRECTORS ............................................................................................................ 11 PROPOSAL 2 — ADVISORY VOTE TO APPROVE NAMED EXECUTIVE OFFICER COMPENSATION ............................ 16 PROPOSAL 3 — APPROVAL OF THE POLYONE CORPORATION 2020 EQUITY AND INCENTIVE COMPENSATION PLAN .........................................................................................................................................17 PROPOSAL 4 — RATIFICATION OF APPOINTMENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM ................................................................................................................................................30 MESSAGE FROM OUR CEO Your vote is very important. Exercise or Base Price of Option Awards (column (i)) Grant Date Fair Value of Stock and Option Awards (column (j)) Narrative Disclosure Relating to the 2019 Summary Compensation Table and the 2019 Grants of Plan-Based Awards Table Outstanding Equity Awards at 2019 Fiscal Year-End Exercise Price Expiration Date Market Value of Shares or Units of Stock That Have Not Vested (h) Equity Incentive Plan Awards: Market or Payout Value of Unearned Shares, Units or Other Rights that Have Not Vested Stock Awards Equity Incentive Plan Awards: Number of Securities Underlying Unearned Options (d) Equity Incentive Plan Awards: Number of Unearned Shares, Units or Other Rights that Have Not Vested Number of Shares or Units of Stock That Have Not Vested Number of Underlying Options (#) Unexercisable Number of Underlying Options (#) Exercisable Option Awardsp ( ) ( ) (j)( )( )( ) (g)( )( )( ) Number of Securities Underlying Unexercised Options (#) Exercisable (column (b)) Number of Securities Underlying Unexercised Options (#) Unexercisable (column (c)) Equity Incentive Plan Awards: Number of Securities Underlying Unexercised Unearned Options (column (d)) Option Exercise Price (column (e)) Option Expiration Date (column (f)) Number of Shares or Units of Stock That Have Not Vested (column (g)) Market Value of Shares or Units of Stock That Have Not Vested (column (h)) Equity Incentive Plan Awards: Number of Unearned Shares, Units or Other Rights That Have Not Vested (column (i)) Equity Incentive Plan Awards: Market or Payout Value of Unearned Shares, Units or Other Rights That Have Not Vested (column (j)) 2019 Option Exercises and Stock Vested Option Awards Stock Awards Number of Shares Acquired on Exercise Value Realized on Exercise ($) Number of Shares Acquired on Vesting Value Realized on Vesting ($) Stock Awards (columns (d) and (e)) 2019 Nonqualified Deferred Compensation Aggregate Executive Registrant Aggregate Aggregate Aggregate Balance at Contributions Contributions Earnings Withdrawals/ Balance at 12/31/2018 in Last FY in Last FY in Last FY Distributions Last FYE ($)(1) ($)(2) ($)(3) ($)(4) ($) ($)(1)(5) Potential Payments Upon Termination or Change of Control Summary of Potential Payments Management Continuity Agreements Executive Severance Plan Long-Term Incentive Awards Retirement Benefits Payments and Benefits Upon Termination — As of the End of Fiscal Year 2019 Name Benefits and Payments Voluntary Termination Retirement (1) t ($) Disabilitytt ($) Death Involuntary Termination with Cause Involuntary Termination without Cause vo u ta yvo u ta y Termination without Cause or for Good Reason Following a Change of Control ($)( )( )( )( )y ( )( )( )y CEO Pay Ratio Disclosure CEO Annual Total Compensation for 2019: $6,106,632 Median Employee Annual Total Compensation for 2019: $53,371 Ratio of CEO to Median Employee Annual Total Compensation for 2019: 114:1 How the Median Employee was Determined in 2017 Compensation Committee Interlocks and Insider Participation Risk Assessment of the Compensation Programs Compensation Committee Report The Compensation Committee of the Board of Directors MISCELLANEOUS MISCELLANEOUS PROVISIONS Voting at the Meeting nott Shareholder Proposals MISCELLANEOUS Proxy Solicitation We will furnish without charge to each person from whom a proxy is being solicited, upon written request of any such person, a copy of the Annual Report on Form 10-K of the Company for the fiscal year ended December 31, 2019, as filed with the SEC, including the financial statements and schedules thereto. Stock-Based Awards in Substitution for Option Rights or Awards Granted by Other Sections 22(a) 22(b) ( ) ( ) Sections 22(a) 22(b)( ) ( ) Table Of Contents Message From Our Ceo Notice Of 2020 Annual Meeting Of Shareholders Proxy Summary Proxy Statement Proposal 1 - Election Of Board Of Directors Proposal 2 - Advisory Vote To Approve Named Executive Officer Compensation Proposal 3 - Approval Of The Polyone Corporation 2020 Equity And Incentive Compensation Plan Proposal 4 - Ratification Of Appointment Of Independent Registered Public Accounting Firm Corporate Governance 2019 Non-employee Director Compensation Ownership Of Polyone Shares Compensation Discussion And Analysis Executive Summary Executive Compensation Philosophy And Objectives What We Pay And Why: Elements Of Compensation Other Aspects Of Our Compensation Programs Executive Compensation 2019 Summary Compensation Table 2019 Grants Of Plan-based Awards Outstanding Equity Awards At 2019 Fiscal Year-end 2019 Option Exercises And Stock Vested 2019 Nonqualified Deferred Compensation Potential Payments Upon Termination Or Change Of Control Ceo Pay Ratio Disclosure Compensation Committee Interlocks And Insider Participation Risk Assessment Of The Compensation Programs Compensation Committee Report Miscellaneous Provisions Appendix A Appendix B

Page 93 • Versus 2010, revenue growth of 9% drives 23% increase in adjusted operating income • Adjusted EPS expands 29% to all-time high of $1.02 Net Sales Adjusted Operating $1.02 Adjusted EPS $2,622 $2,643 $2,739 $2,061 $2,622 $2,864 Net Sales $88 $87 $72 $59 $147 $181 Adjusted Operating Income $0.12 $0.27 $0.21 $0.13 $0.79 $1.02 ($ millions) ($ millions) Page 94 • Each platform contributed to our year over year operating income growth • Record OI achieved in Specialty and POD • Ten quarters of double-digit adjusted EPS expansion POD PP&SSpecialty Platform ROS%* 0.6% 1.5% 3.2% 4.3% 5.3% 8.4% 8.0% 2.9% 2.6% 3.0% 3.5% 4.0% 4.6% 5.6% 6.7% 5.5% 6.1% 3.1% 5.0% 7.0% 7.2% $20 $19 $22 $28 $25 $42 $56 I POD $76 $64 $66 $31 $33 $54 $62 In PP&S $5 $13 $31 $46 $46 $87 $89 I Specialty Platform *ROS% is defined as adjusted operating income % of revenue Page 95 • Continued portfolio repositioning � Sale of SunBelt equity investment � Acquisition of specialty companies ColorMatrix and Uniplen • World-class working capital of 9.6% maintained while improving on-time delivery to 94%improving on-time delivery to 94% 81% 87% 88% 95% 93% 92% 94% 2005 2006 2007 2008 2009 2010 2011 14.3% 16.2% 14.4% 18.9% 11.7% 9.6% 9.6% 2005 2006 2007 2008 2009 2010 2011 On-Time Delivery Working Capital % of Sales Page 96 First Quarter 2012 Highlights • Revenues increased 9% over Q1 2011 to a new quarterly record • Adjusted EPS increased 12% $0.26 $0.29 Adjusted EPS • Adjusted EPS increased 12% over prior year • All platforms delivered double-digit operating income growth $25.2 $14.7 $29.1 $17.8 $16.7 Specialty PP&S POD Adjusted Operating Income $14.3 Page 97 • Total Debt at 3/31/12 Less: Cash Net Debt • Available Liquidity $706 186 $520 $360 $250 $350 $400 $450 Debt Maturities As of March 31, 2012 Debt Maturities & Liquidity Summary – 3/31/12 • Available Liquidity Cash ABL Availability Total Liquidity • Net Debt / EBITDA* = 1.9x $186 156 $342 *Adjusted EBITDA TTM Pro forma for ColorMatrix $50 $0 $50 $100 $150 $200 $250 2015 2017 2020 Page 98 • Repurchased 6 million shares in 2011 Share Share RepurchaseRepurchase • Introduced a quarterly dividend in Q1 2011 and increased in Q1 DividendsDividends • Expanding our sales, marketing, and technical capabilities is top Organic Organic GrowthGrowth • Targets that expand our: • Specialty offering • End market presence AcquisitionsAcquisitions Use of Cash Current Cash Balance = $186M Net Debt / EBITDA* = 1.9X • 7.9 million shares remain available for repurchase under the current authorization increased in Q1 2012 • Objective of maintaining and growing capabilities is top priority • Investing in operational and LSS initiatives • CAPEX • End market presence • Geographic footprint • Synergy opportunities • Adjacent material solutions *Adjusted EBITDA TTM Pro forma for ColorMatrix Page 99 Page 100

Wulfsohn 56 2011 Chairman and Chief Executive Officer, Ashland Global Holdings Inc. Patterson as Chairman of our Board and our Chief Executive Officer (“CEO”). Patterson is the Chairman of our Board and our CEO.

Müller, CEO SQS 66 70 _2  / J un e 20 19  / V er si on 2 .0 A.

Bob Patterson Chairman, President, and CEO August 1, 2020

Bob Patterson Chairman, President, and CEO February 2, 2022

Ashish Khandpur President and CEO December 18, 2023

Ashish Khandpur President and CEO December 18, 2023