1616267 Certification Effective Date: April 1, 2021 Issue Date: March 30, 2021 Certificate Expiry Date: March 31, 2024 ________________________________________________________________________________ ISO 9001 Registered by: QMI-SAI Canada Limited (SAI Global), 20 Carlson Court, Suite 200, Toronto, Ontario M9W 7K6 Canada. To verify that this certificate is current, please refer to the SAI Global On-Line Certification Register: https://www.saiglobal.com/en-us/assurance/auditing_and_certification/certification_registry/ This is to certify that operates a which complies with the requirements of for the following scope of certification CERTIFICATE OF REGISTRATION Frank Camasta Global Head of Technical Services SAI Global Assurance http://www.qmi-saiglobal.com/qmi_companies http://www.qmi-saiglobal.com/qmi_companies

Figure 1 illustrates a storyboard method to capture the key task analysis steps of a diabetic insulin routine. Figure 12: Duration of use BMC Musculoskeletal Disorders 2021 22:186. https://doi.org/10.1186/s12891-021-04054-6 Figure 11: Duration of use Journal of Rehabilitation Medicine, 47 2 (2015): 154-60. https://doi.org/10.2340/16501977-1897 https://doi.org/10.1186/s12891-021-04054-6 https://doi.org/10.2340/16501977-1897 https://www.semanticscholar.org/paper/Hand-grip-fatigability-in-persons-with-multiple-to-Severijns-Lamers/834a2a4e4665c6e9f3d7513507807314d0214828 Ergonomic Grip Design Guide 11 Pre-production validation of the conceptual design is paramount in reducing the overall risk of the program. PHYSICS Mode 1 Eigenfrequencies in the side-to-side motion.

https://www.avient.com/investors/ https://edge.media-server.com/mmc/p/nh3eiqvs/ https://www.avient.com/investors/ https://register.vevent.com/register/BI3efc1a22a8f740be852b7303538a7763 https://www.avient.com/investors/events-presentations 3 Non-GAAP Financial Measures The Company uses both GAAP (generally accepted accounting principles) and non-GAAP financial measures. For more information, visit https://www.avient.com. NEWS RELEASE Attachment 1

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Zwolseweg 1, 2994 LB, Barendrecht, Netherlands - TEL: +31(0)102922689. www.dnv.com/assurance MANAGEMENT SYSTEM CERTIFICATE Certificate no.: 7071-1998-AQ-RGC-RvA Initial certification date: 28 April 1998 Valid: 30 March 2024 – 29 March 2027 This is to certify that the management system of PolyOne-Shanghai, China No. 88, Guo Shou Jing Road, Z. Park, China (Shanghai) Pilot Free Trade Zone, Shanghai, China 201203 and the sites as mentioned in the appendix accompanying this certificate has been found to conform to the Quality Management System standard: GB/T 19001-2016 / ISO 9001:2015 This certificate is valid for the following scope: Design and Manufacture of Colour and Additive Concentrates http://www.dnv.com/assurance Certificate no.: 7071-1998-AQ-RGC-RvA Place and date: Shanghai, 20 March 2024 Lack of fulfilment of conditions as set out in the Certification Agreement may render this Certificate invalid. Park, China (Shanghai) Pilot Free Trade Zone, Shanghai, China 201203 Design and Manufacture of Colour and Additive Concentrates http://www.dnv.com/assurance

By 2030, Avient will reduce Scope 1 & 2 greenhouse gas (GHG) emissions by 60% with 2019 as a baseline and achieve operational carbon neutrality by 2050 We are proud to have reached our original target of 35% in 2020 by reducing our Scope 1 & 2 GHG emissions by 37% https://www.there100.org https://endplasticwaste.org/about/

No. 0514.02) Revised 10/08/2019 Page 2 of 2 Test Description: Test Method or Standard: Thermal Analysis DSC (Differential Scanning Calorimetry) ASTM D3418, E794, E1356 TGA (Thermogravimetric Analysis) ASTM E1131 Karl Fischer Moisture Content ASTM D6869 Phthalate Determination by CPSIA CPSC-CH-C1001-09.3 1 The Consumer Product Safety Improvement Act (CPSIA) requires that every children's product subject to a federal consumer product safety requirement be tested by a Consumer Product Safety Commission (CPSC) accepted laboratory for compliance with the applicable federal children's product safety requirements. Please verify this organization’s acceptance status by using the CPSC’s searchable database, located at http://www.cpsc.gov/cgi-bin/labsearch/. http://www.cpsc.gov/cgi-bin/labsearch/ For the tests to which this accreditation applies, please refer to the laboratory’s Chemical Scope of Accreditation.

No. 0514.02) Revised 09/21/2021 Page 2 of 2 Test Description: Test Method or Standard: Thermal Analysis DSC (Differential Scanning Calorimetry) ASTM D3418, E794, E1356 TGA (Thermogravimetric Analysis) ASTM E1131 Karl Fischer Moisture Content ASTM D6869 Phthalate Determination by CPSIA CPSC-CH-C1001-09.3, CPSC-CH-C1001-09.4 1 The Consumer Product Safety Improvement Act (CPSIA) requires that every children's product subject to a federal consumer product safety requirement be tested by a Consumer Product Safety Commission (CPSC) accepted laboratory for compliance with the applicable federal children's product safety requirements. Please verify this organization’s acceptance status by using the CPSC’s searchable database, located at http://www.cpsc.gov/cgi-bin/labsearch/. http://www.cpsc.gov/cgi-bin/labsearch/ For the tests to which this accreditation applies, please refer to the laboratory’s Chemical Scope of Accreditation.

1616267 Certification Effective Date: April 1, 2021 Issue Date: March 30, 2021 Certificate Expiry Date: March 31, 2024 ________________________________________________________________________________ ISO 9001 Registered by: QMI-SAI Canada Limited (SAI Global), 20 Carlson Court, Suite 200, Toronto, Ontario M9W 7K6 Canada. To verify that this certificate is current, please refer to the SAI Global On-Line Certification Register: https://www.saiglobal.com/en-us/assurance/auditing_and_certification/certification_registry/ This is to certify that operates a which complies with the requirements of for the following scope of certification CERTIFICATE OF REGISTRATION Frank Camasta Global Head of Technical Services SAI Global Assurance http://www.qmi-saiglobal.com/qmi_companies http://www.qmi-saiglobal.com/qmi_companies

Webcast Details The webcast can be viewed live at avient.com/investors, or by clicking here: https://edge.media- server.com/mmc/p/k7okojz2. To access, dial 1-855-859-2056 (domestic) or 1-404-537-3406 (international) and provide conference ID number 2171339. http://www.avient.com/investors https://edge.media-server.com/mmc/p/k7okojz2 https://edge.media-server.com/mmc/p/k7okojz2 http://www.avient.com/investors 4 About Avient Avient Corporation (NYSE: AVNT), with 2021 revenues of $4.8 billion, provides specialized and sustainable material solutions that transform customer challenges into opportunities, bringing new products to life for a better world.