Patterson President and Chief Executive Officer PolyOne Corporation Page 6 PolyOne Corporation Page 7 Robert M. Patterson President and Chief Executive Officer Bradley C. Richardson Executive Vice President and Chief Financial Officer PolyOne Corporation Page 71 Who We Are Growing With http://www.google.com/url?

and Ferro Corporation, and to add Avery Dennison Corporation, Trinseo S.A. and Hexcel Corporation. FMC Corporation The Valspar Corporation Avery Dennison Corporation H.B. Axiall Corporation* Hexcel Corporation Cabot Corporation International Flavors & Fragrances Inc

Patterson President and Chief Executive Officer PolyOne Corporation Please refer to the accompanying materials for voting instructions. Sigma-Aldrich Corporation* Axiall Corporation Ferro Corporation The Scotts Miracle-Gro Company Cabot Corporation FMC Corporation The Valspar Corporation Celanese Corporation H.B. Management Continuity Agreements We have entered into Continuity Agreements with all of our elected corporate officers, including each of the Named Executive Officers.

Officer@Avient.com. Ethics Hotline We expect that most questions and concerns or potential violations can be effectively addressed by your supervisor, human resources representative or the Corporate Ethics Officer. For other officers and employees, waivers may be granted only by the Corporate Ethics Officer in consultation with the standing members of the Ethics Committee.

MSC Certificate Place and date: For the issuing office: Shanghai, 27 April, 2022 DNV - Business Assurance Suite A, Building 9, No.1591 Hongqiao Road, Changning District, Shanghai 200336, P.R. ACCREDITED UNIT: DNV Business Assurance B.V., Zwolseweg 1, 2994 LB, Barendrecht, Netherlands - TEL: +31(0)102922689. www.dnv.com/assurance Page 2 of 2 Appendix to Certificate Polyone - Suzhou, China Locations included in the certification are as follows: Site Name Site Address Site Scope PolyOne Management (Shanghai) Co., Ltd.

RTF Template Place and date: For the issuing office: Shanghai, 19 March, 2021 DNV GL - Business Assurance Suite A, Building 9, No.1591 Hongqiao Road, Changning District, Shanghai 200336, P.R. TEL:+31(0)102922689. www.dnvgl.com/assurance Page 2 of 2 Appendix to Certificate PolyOne-Shanghai, China Locations included in the certification are as follows: Site Name Site Address Site Scope PolyOne Polymer (Tianjin) Company Limited No.28#C, Jin Bin Hi-Tech Industrial Park, 156 Nan Hai Road, Tianjin Economic-Technological, Tianjin, China, 300457 Manufacture of Masterbatch PolyOne-Shanghai, China No. 88, Guo Shou Jing Road, Z.

MSC Certificate Place and date: For the issuing office: Shanghai, 20 March 2024 DNV - Business Assurance Building 9, No. 1591 Hongqiao Road, Changning DistrictShanghai China 200336 Zhu Hai Ming Management Representative Lack of fulfilment of conditions as set out in the Certification Agreement may render this Certificate invalid. ACCREDITED UNIT: DNV Business Assurance B.V., Zwolseweg 1, 2994 LB, Barendrecht, Netherlands - TEL: +31(0)102922689. www.dnv.com/assurance Page 2 of 2 Appendix to Certificate PolyOne-Shanghai, China Locations included in the certification are as follows: Site Name Site Address Site Scope PolyOne Polymer (Tianjin) Company Limited No. 28#C, Jin Bin Hi-Tech Industrial Park, No. 156, Nan Hai Road, Tianjin Economic- Technological Development Area, Tianjin, China 300457 Manufacture of Colour and Additive Concentrates PolyOne-Shanghai, China No. 88, Guo Shou Jing Road, Z.

With head offices in Vienna, Austria, we employ 6,900 employees and operate in over 120 countries. Media contact Nicole DeChant  Avient Corporation  nicole.dechant@avient.com   Company Officers

RTF Template P lac e and date: For the is s uing offic e: Shanghai, 30 March, 2018 DNV GL – Business A ssurance Suite A , Building 9, No.1591 Hongqiao Road, Changning District, Shanghai 200336, P.R. TEL:+31102922689. assurance. dnvgl.com Appendix to Certificate PolyOne-Shanghai, China Locations included in the certification are as follows: Site Name Site Address Site Scope PolyOne-Shanghai, C hina No. 88, Guo Shou Jing Road, Z.

Our internet address is www.avient.com. Pune, India 77. Taoyuan, Taiwan Pune, India (a) 21.