To meet the manufacturer’s goals for the mouse grip, a clear TPE overmolding material, GLS Versaflex™, was formulated for improved ergonomics and comfort, strong chemical resistance, and excellent bonding to the ABS substrate. This custom Versaflex grade provides 60 Shore A hardness and superior tear strength. 热塑性弹性体：GLS™ Versaflex™

Newly Expanded Versaflex™ PF Thermoplastic Elastomers for Surface Protective Films with Ultra-High Adhesion Series Available from Avient Avient Announces Expansion of Versaflex™ PF Thermoplastic Elastomers for surface protective films with new ultra-high adhesion series  To do

1400 Ravello Drive, Katy, TX, 77449-5164, USA - TEL: +1 281-396-1000. www.dnv.com Page 1 of 2 MANAGEMENT SYSTEM CERTIFICATE Certificate no.: 11229-2006-CHN-IATF IATF Certificate No: 0573810 Valid: 21 May 2025 – 20 May 2028 This is to certify that the management system of PolyOne - Suzhou, China EM Sector, 77 Shenggang Street, Suzhou Industrial Park, Suzhou, Jiangsu, China 215024 (USI: CF4943) and, if applicable, the remote supporting locations as mentioned in the Appendix accompanying this Certificate has been found to conform to the Quality Management System standard: IATF 16949:2016 This certificate is valid for the following scope: DESIGN AND MANUFACTURE OF PLASTIC COMPOUNDING MATERIAL EXCLUSION: NONE http://www.dnv.com Certificate no.: 11229-2006-CHN-IATF IATF Certificate No: 0573810 Place and date: Katy, TX, 22 May 2025 Lack of fulfilment of conditions as set out in the Certification Agreement may render this Certificate invalid. ACCREDITED UNIT: DNV Business Assurance USA Inc., 1400 Ravello Drive, Katy, TX, 77449-5164, USA - TEL: +1 281-396-1000. www.dnv.com Page 2 of 2 Appendix to Certificate PolyOne - Suzhou, China Remote Support Locations included in the certification are as follows: Site Name Site Address RSL Activities Certification Body Avient China Co., Ltd. EM Sector, 77 Shenggang Street, Suzhou Industrial Park, Suzhou, Jiangsu, China 215024 (USI: T2HN2N) Sales, Contract Review DNV PolyOne Management (Shanghai) Co., Ltd.

PolyOne Corporation Investor Day 2012 PolyOne Investor Presentation 5th Annual Wells Fargo Industrial and Construction Conference 2014年5月8日 • In this presentation, statements that are not reported financial results or other historical information are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. In addition, operating income before special items and adjusted EPS are components of various PolyOne annual and long-term employee incentive plans ���PolyOne Investor Presentation�5th Annual Wells Fargo�Industrial and Construction Conference �2014年5月8日 �� Forward – Looking Statements Use of Non-GAAP Measures PolyOne Commodity to Specialty Transformation Confirmation of Our Strategy Strategy and Execution Drive Results PolyOne�At A Glance Mix Shift Highlights Specialty Transformation Proof of Performance & 2015 Goals Bridge to $2.50 Adjusted EPS by 2015 Innovation Drives Earnings Growth Unique and Innovative Solutions Debt Maturities & Pension Funding – 3/31/14 Free Cash Flow and Strong Balance Sheet �Fund Investment / Shareholder Return Why Invest In PolyOne?

PolyOne Corporation Page 1 PolyOne Investor Presentation Credit Suisse Boston Basic Materials Conference June 2015 PolyOne Corporation Page 2 Forward-Looking Statements  In this presentation, statements that are not reported financial results or other historical information are “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. S&P 500 PolyOne Corporation Page 9 2006 Q1 2015 2020 “Where we were” “Where we are” Platinum Vision 1) Operating Income % Specialty: Global Color, Additives & Inks 1.7% 16.2% 20%+ Global Specialty Engineered Materials 1.1% 16.3% 20%+ Designed Structures & Solutions 1.4% (2012) 2.7% 12 – 14% Performance Products & Solutions 5.5% 6.5% 10 – 12% Distribution 2.6% 5.9% 6.5 – 7.5% 2) Specialty Platform % of Operating Income 6.0% 69% 80%+ 3) ROIC 5.0% 11.4% 15% 4) Adjusted EPS Growth N/A 22 Consecutive Quarters of EPS Growth Double Digit Expansion Proof of Performance & 2020 Goals PolyOne Corporation Page 10 Platinum Vision: Pathway to Accelerated Growth Organic Sales Growth Margin Expansion Share Repurchases Acquisitions PolyOne Corporation Page 11 Innovation Drives Earnings Growth *Percentage of Specialty Platform revenue from products introduced in last five years $20 $53 2006 2014 Research & Development Spending ($ millions) Specialty Platform Vitality Index Progression* 14% 27% 2006 2014 Specialty Platform Gross Margin % 20% 44% 2006 2014 Specialty Vitality Index Target ≥ 35% PolyOne Corporation Page 12 Megatrends Aligned with Key End Markets Decreasing Dependence on Fossil Fuels Protecting the Environment Improving Health and Wellness Megatrend End Markets Globalizing and Localizing Health & Wellness Transportation Packaging Consumer PolyOne Corporation Page 13 Prototype Frame Opportunity Scale-up & Test Market Build Business Case Commercial Launch Phase 1 Phase 2 Phase 3 Phase 4 Phase 5 6 9 7 3 5 12 5 3 2 8 4 2 4 3 1 Breakthrough Platform Derivative A Rich Pipeline of Opportunity Number of Projects 14 8 18 12 22 74 Addressable Market ($ millions) $700 $600 $600 $1,900 PolyOne Corporation Page 14 60% 98% 20% 30% 40% 50% 60% 70% 80% 90% 100% 2008 Q1 2015 Pension Funding** As of 2015年3月31日 Debt Maturities & Pension Funding Net Debt / EBITDA* = 2.1x $49 $317 $600 $0 $100 $200 $300 $400 $500 $600 $700 $800 2015 2020 2023 Debt Maturities As of 2015年3月31日 ($ millions) Coupon Rate: 7.500% 7.375% 5.250% ** includes US-qualified pension plans only *TTM 3/31/2015 PolyOne Corporation Page 15 Free Cash Flow and Strong Balance Sheet Fund Investment / Shareholder Return  Expanding our sales, marketing, and technical capabilities  Investing in operational and LSS initiatives  ~75% of capital expenditures fund growth initiatives Organic Growth Acquisitions Share Repurchases Dividends $0.16 $0.20 $0.24 $0.32 $0.40 $0.10 $0.20 $0.30 $0.40 $0.50 2011 2012 2013 2014 2015 Annual Dividend  Targets that expand our: • Specialty offerings • End market presence • Geographic breadth  Synergy opportunities  Adjacent material solutions  Repurchased over 500k shares in Q1 2015  Repurchased 11.8 million shares since early 2013  8.2 million shares are available for repurchase under the current authorization PolyOne Corporation Page 16 PolyOne Core Values Innovation Collaboration Excellence PolyOne Corporation Page 17 The New PolyOne: A Specialty Growth Company Why Invest In PolyOne? 1) Special items are a non-GAAP financial measure.

ITEM 1. McHenry, Illinois 1. PolyOne may make all or part of any repurchases pursuant to accelerated share repurchases or Rule 10b5-1 plans.

PET SUPPLY MANUFACTURER D O G T O Y • Tear strength • Durability • Colorability • Formulation must not intentionally contain BPA, heavy metals, latex, natural rubber, phthalates, or SVHC (REACH) • Optimized material processing and tooling through technical services and application development support • Delivered a solution to address regulation and consumer safety concerns Versaflex™ Thermoplastic Elastomer KEY REQUIREMENTS WHY AVIENT? https://www.avient.com/products/thermoplastic-elastomers/versaflex-thermoplastic-elastomers Pet supply manufacturer

PHILIPS AVENT M I L K B O T T L E S E A L • FDA, EU & China fatty food contact regulations • Provided a tight seal at elevated temperatures for sterilization • Can cater to repeated refrigeration • Utilized material expertise to develop a product to meet fatty food contact regulations and offer safe sealing performance • Enabled mothers to convert their Philips AVENT bottles into breast milk storage containers Versaflex™ FFC2882-87 Thermoplastic Elastomer KEY REQUIREMENTS AVIENT SOLUTION REGULATORY COMPLIANCE LEARN MORE WHY AVIENT? https://www.avient.com/products/thermoplastic-elastomers/versaflex-thermoplastic-elastomers

PRE-FILLED SYRINGE COMPANY S Y R I N G E T I P C A P • Excellent sealing performance • No DEHP or natural rubber latex added during processing • Can be sterilized by EtO • Compliant with ISO 10993-4&5 and USP Class VI • Formulated a solution that met rigorous medical application requirements • Leveraged global footprint to ensure supply continuity • Increased process efficiency by replacing previous thermoset material with a TPE Versaflex™ HC Thermoplastic Elastomers KEY REQUIREMENTS WHY AVIENT? https://www.avient.com/products/thermoplastic-elastomers/versaflex-hc-thermoplastic-elastomers

A LIFE SCIENCE COMPANY S E R U M C O L L E C T I O N C A R T R I D G E • Excellent clarity • Good bonding and peel strength onto PP • Heat resistance • Meet sterilization needs • Easy processing • Formulated transparent Shore 50A TPE with excellent adhesion onto PP and good sealing performance • Met regulatory requirements for USP Class VI and ISO 10993-4,5 • Provided a short lead time and on-site technical service Versaflex™ CL Thermoplastic Elastomers KEY REQUIREMENTS WHY AVIENT? https://www.avient.com/products/thermoplastic-elastomers/versaflex-hc-thermoplastic-elastomers