Identifier Risk 1 Where in the value chain does the risk driver occur? Scope 1 Base year start January 1, 2019 Base year end December 31, 2019 Base year emissions (metric tons CO2e) 18,709 Comment We are restating our baseline year emissions to include our recent acquisitions. This was multiplied by Avient's total scope 1 emissions to identify HP's contribution.

Handelsregister B des Amtsgerichts Mannheim Nummer der Firma: Seite 1 von 4 HRB 521568 Nummer der Eintragung a) Firma b) Sitz, Niederlassung, inländische Geschäftsanschrift, empfangsberechtigte Person, Zweigniederlassungen c) Gegenstand des Unternehmens Grund- oder Stammkapital a) Allgemeine Vertretungsregelung b) Vorstand, Leitungsorgan, geschäftsführende Direktoren, persönlich haftende Gesellschafter, Geschäftsführer, Vertretungsberechtigte und besondere Vertretungsbefugnis Prokura a) Rechtsform, Beginn, Satzung oder Gesellschaftsvertrag b) Sonstige Rechtsverhältnisse a) Tag der Eintragung b) Bemerkungen 1 2 3 4 5 6 7 1 a) PolyOne Th. Nicht mehr Geschäftsführer: Setzen, Marc, Baden-Baden, *27.05.1969 a) 05.02.2007 Rinke Abruf vom 08.11.2021 19:52 Handelsregister B des Amtsgerichts Mannheim Nummer der Firma: Seite 2 von 4 HRB 521568 Nummer der Eintragung a) Firma b) Sitz, Niederlassung, inländische Geschäftsanschrift, empfangsberechtigte Person, Zweigniederlassungen c) Gegenstand des Unternehmens Grund- oder Stammkapital a) Allgemeine Vertretungsregelung b) Vorstand, Leitungsorgan, geschäftsführende Direktoren, persönlich haftende Gesellschafter, Geschäftsführer, Vertretungsberechtigte und besondere Vertretungsbefugnis Prokura a) Rechtsform, Beginn, Satzung oder Gesellschaftsvertrag b) Sonstige Rechtsverhältnisse a) Tag der Eintragung b) Bemerkungen 1 2 3 4 5 6 7 3 b) Geschäftsanschrift: Adolf-Dambach-Str. 2, 76571 Gaggenau b) Bestellt als Geschäftsführer: Tomaselli, Frank, La Wantzenau/Frankreich, *28.12.1963 einzelvertretungsberechtigt mit der Befugnis, im Namen der Gesellschaft mit sich im eigenen Namen oder als Vertreter eines Dritten Rechtsgeschäfte abzuschließen. Bergmann GmbH a) Die Gesellschafterversammlung vom 21.10.2021 hat die Änderung des Gesellschaftsvertrages in § 1 (Firma und Sitz) beschlossen. a) 08.11.2021 Rühl Abruf vom 08.11.2021 19:52

ECert - 2023-11-22T151036.517.pdf Page 1 of 10 Validity of this certificate is based on the successful completion of the periodic surveillance audits of the management system defined by the above scope and is contingent upon prompt,written notification to ABS Quality Evaluations, Inc. of significant changes to the management system or components thereof. All rights reserved. 65537Certificate No: Facility: Avient Corporation - Cota, Colombia Autopista Medellín Km 2.5, Via Parcelas Km 1 Vereda Siberia Cota, Cundinamarca 250017 Colombia Facility: Avient Corporation - Gebze, Turkey Ihsan Dede Cad. Mariana Langiewicza 50 Lódzkie Konstantynow 95-050 Poland Activity: Design & Manufacture of Color, Additive Concentrate & Specialty Compounds Activity: Design and Manufacture of Colour and Additive Concentrates, Thermoplastic Resins and Specialty Compounds Facility: Avient Pakistan (Private) Limited 1-A/1, Sector-20 Korangi Industrial Area Korangi, Sindh 74900 Pakistan Facility: Avient Corporation - Lahnstein, Germany Hohenrhein 1 56112 Lahnstein, Rheinland-Pfalz Germany Activity: Design and Manufacture of Colour and Additive Concentrates, Thermoplastic Resins and Specialty Compounds Activity: Design and Manufacture of colour and additive concentrates, thermoplastic resins and specialty compounds Facility: Avient Corporation - Esenyurt, Turkey Orhan Gazi Mahallesi 1683 Sokak No:6 34538 Esenyurt Istanbul Turkey Facility: Avient Corporation - Jurong, Singapore No. 8 Third Chin Bee Road Jurong Industrial Estate Jurong 618684 Singapore Activity: Design and Manufacture of Specialty Engineered Thermoplastics Activity: Design and Manufacture of Colorants and Additives for Plastics Page 5 of 10 ABS Quality Evaluations Avient Corporation ISO 14001:2015 Certificate Of Conformance ANNEX At Below Facilities: Validity of this certificate may be confirmed at www.abs-qe.com/cert_validation.

ECert - 2023-11-22T154408.223.pdf Page 1 of 10 Validity of this certificate is based on the successful completion of the periodic surveillance audits of the management system defined by the above scope and is contingent upon prompt,written notification to ABS Quality Evaluations, Inc. of significant changes to the management system or components thereof. All rights reserved. 65536Certificate No: Facility: Avient Corporation - Cota, Colombia Autopista Medellín Km 2.5, Via Parcelas Km 1 Vereda Siberia Cota, Cundinamarca 250017 Colombia Facility: Avient Corporation - Gebze, Turkey Ihsan Dede Cad. Mariana Langiewicza 50 Lódzkie Konstantynow 95-050 Poland Activity: Design & Manufacture of Color, Additive Concentrate & Specialty Compounds Activity: Design and Manufacture of Colour and Additive Concentrates, Thermoplastic Resins and Specialty Compounds Facility: Avient Pakistan (Private) Limited 1-A/1, Sector-20 Korangi Industrial Area Korangi, Sindh 74900 Pakistan Facility: Avient Corporation - Lahnstein, Germany Hohenrhein 1 56112 Lahnstein, Rheinland-Pfalz Germany Activity: Design and Manufacture of Colour and Additive Concentrates, Thermoplastic Resins and Specialty Compounds Activity: Design and Manufacture of colour and additive concentrates, thermoplastic resins and specialty compounds Facility: Avient Corporation - Esenyurt, Turkey Orhan Gazi Mahallesi 1683 Sokak No:6 34538 Esenyurt Istanbul Turkey Facility: Avient Corporation - Jurong, Singapore No. 8 Third Chin Bee Road Jurong Industrial Estate Jurong 618684 Singapore Activity: Design and Manufacture of Specialty Engineered Thermoplastics Activity: Design and Manufacture of Colorants and Additives for Plastics Page 5 of 10 ABS Quality Evaluations Avient Corporation RC14001®:2015 Certificate Of Conformance ANNEX At Below Facilities: Validity of this certificate may be confirmed at www.abs-qe.com/cert_validation.

Page 1 of 5 https://abs.zertic.com https://abs.zertic.com RC14001®:2023 Certificate Of Conformance ANNEX Certificate No: 65536 Avient Corporation At the below facilities FACILITY NAME FACILITY ACTIVITY ADDRESS Avient Corporation Avon Lake Corporate Responsible Care Corporate Support Activities in Sr. Mariana Langiewicza 50, 95- 050 Konstantynow, Poland Avient Corporation - Korachi, Sindh Pakistan Design and Manufacture of Colour and Additive Concentrates, Thermoplastic Resins and Specialty Compounds 1-A/1, Sector-20 , 74900 Korachi, Pakistan Avient Corporation Design and Manufacture of colour and additive concentrates, thermoplastic resins and specialty compounds Hohenrhein 1 Lahnstein Rheinland- Pfalz 5612 Germany Avient Corporation Design & Manufacturing of Colour and Additive Concentrates. Garibaldi 2405 , 1832 Lomas de Zamora, Argentina Avient Corporation Design and Manufacture of Colour and Additive Concentrates, Thermoplastic Resins and Specialty Compounds Rue Fond Jean Pâques 1, 1348 Louvain-La-Nueve, Belgium Avient Corporation Design and Manufacture of Colorants and Additives Concentrates and Specialty Compounds for Thermo Plastic Resin.

ECert - 2024-03-22T110644.362.pdf Page 1 of 10 Validity of this certificate is based on the successful completion of the periodic surveillance audits of the management system defined by the above scope and is contingent upon prompt,written notification to ABS Quality Evaluations, Inc. of significant changes to the management system or components thereof. All rights reserved. 65537Certificate No: Facility: Avient Corporation - Cota, Colombia Autopista Medellín Km 2.5, Via Parcelas Km 1 Vereda Siberia Cota, Cundinamarca 250017 Colombia Facility: Avient Corporation - Gebze, Turkey Ihsan Dede Cad. Mariana Langiewicza 50 Lódzkie Konstantynow 95-050 Poland Activity: Design & Manufacture of Color, Additive Concentrate & Specialty Compounds Activity: Design and Manufacture of Colour and Additive Concentrates, Thermoplastic Resins and Specialty Compounds Facility: Avient Pakistan (Private) Limited 1-A/1, Sector-20 Korangi Industrial Area Korangi, Sindh 74900 Pakistan Facility: Avient Corporation - Lahnstein, Germany Hohenrhein 1 56112 Lahnstein, Rheinland-Pfalz Germany Activity: Design and Manufacture of Colour and Additive Concentrates, Thermoplastic Resins and Specialty Compounds Activity: Design and Manufacture of colour and additive concentrates, thermoplastic resins and specialty compounds Facility: Avient Corporation - Esenyurt, Turkey Orhan Gazi Mahallesi 1683 Sokak No:6 34538 Esenyurt Istanbul Turkey Facility: Avient Corporation - Jurong, Singapore No. 8 Third Chin Bee Road Jurong Industrial Estate Jurong 618684 Singapore Activity: Design and Manufacture of Specialty Engineered Thermoplastics Activity: Design and Manufacture of Colorants and Additives for Plastics Page 5 of 10 ABS Quality Evaluations Avient Corporation ISO 14001:2015 Certificate Of Conformance ANNEX At Below Facilities: Validity of this certificate may be confirmed at www.abs-qe.com/cert_validation.

Committees: 1, 2 GREGORY J. Committees: 1, 3 KERRY J. Committees: 1, 2 COMMITTEES 1.

Article 1. Cet extrait est délivré avant enregistrement conformément à l'article 173, 1° bis du Code des Droits d'Enregistrement. Peter Van Melkebeke Notaire Bi jla ge n bi j h et B el gi sc h St aa ts bl ad - 02 /1 2/ 20 20 - An ne xe s du M on ite ur b el ge

NIIF Plenas UBICACIÓN Dirección del domicilio principal: Aut Medellin Km 2.5 Via Parcelas 1 Km Municipio: Cota (Cundinamarca) Correo electrónico: andres.perez@clariant.com Teléfono comercial 1: 8773300 Teléfono comercial 2: No reportó. Dirección para notificación judicial: Aut Medellin Km 2.5 Via Parcelas 1 Km Municipio: Cota (Cundinamarca) Correo electrónico de notificación: esperanza.laserna@avient.com Teléfono para notificación 1: 8773300 Teléfono para notificación 2: No reportó. OBJETO SOCIAL Objeto Social: El objeto social de la sociedad será: 1.

To access Avient’s news library online, please visit www.avient.com/news # # # Investor Relations Contact: Giuseppe (Joe) Di Salvo Vice President, Treasurer and Investor Relations Avient Corporation +1 440-930-1921 giuseppe.disalvo@avient.com Media Contact: Kyle G. Rose Vice President, Corporate Communications Avient Corporation +1 440-930-3162 kyle.rose@avient.com http://www.avient.com/news 7 Attachment 1 Avient Corporation Summary of Condensed Consolidated Statements of Income (Unaudited) (In millions, except per share data) Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Sales $ 823.3 $ 818.0 $ 2,606.5 $ 2,508.5 Operating Income 40.6 52.8 242.9 229.6 Net (loss) income from continuing operations attributable to Avient shareholders (27.4) 33.7 99.8 143.3 Basic (loss) earnings per share from continuing operations attributable to Avient shareholders $ (0.30) $ 0.37 $ 1.09 $ 1.57 Diluted (loss) earnings per share from continuing operations attributable to Avient shareholders $ (0.30) $ 0.37 $ 1.08 $ 1.56 Senior management uses comparisons of adjusted net income attributable to Avient shareholders and diluted adjusted earnings per share (EPS) attributable to Avient shareholders, excluding special items, to assess performance and facilitate comparability of results. Three Months Ended September 30, 2022 2021 GAAP Results Special Items Adjusted Results GAAP Results Special Items Adjusted Results (Loss) income from continuing operations before income taxes $ (29.0) $ 82.0 $ 53.0 $ 35.4 $ 19.9 $ 55.3 Income tax expense - GAAP 1.2 — 1.2 (2.0) — (2.0) Income tax impact of special items (Attachment 3) — (20.5) (20.5) — (4.6) (4.6) Tax adjustments (Attachment 3) — 6.8 6.8 — (3.6) (3.6) Income tax (expense) benefit $ 1.2 $ (13.7) $ (12.5) $ (2.0) $ (8.2) $ (10.2) Effective Tax Rate(1) 4.1 % 23.7 % 5.7 % 18.4 % (1) Rates may not recalculate from figures presented herein due to rounding 14 Nine Months Ended September 30, 2022 2021 GAAP Results Special Items Adjusted Results GAAP Results Special Items Adjusted Results Income from continuing operations before income taxes $141.2 $ 89.6 $ 230.8 $176.1 $ 36.5 $ 212.6 Income tax expense - GAAP (41.5) — (41.5) (32.1) — (32.1) Income tax impact of special items (Attachment 3) — (22.5) (22.5) — (8.9) (8.9) Tax adjustments (Attachment 3) — 10.8 10.8 — (1.6) (1.6) Income tax (expense) benefit $ (41.5) $ (11.7) $ (53.2) $ (32.1) $ (10.5) $ (42.6) Effective Tax Rate(1) 29.4 % 23.1 % 18.2 % 20.0 % (1) Rates may not recalculate from figures presented herein due to rounding Three Months Ended September 30, Nine Months Ended September 30, Reconciliation to EBITDA and Adjusted EBITDA: 2022 2021 2022 2021 Net (loss) income from continuing operations – GAAP $ (27.8) $ 33.4 $ 99.7 $ 144.0 Income tax (benefit) expense (1.2) 2.0 41.5 32.1 Interest expense 37.3 19.0 70.4 57.8 Depreciation and amortization from continuing operations 39.8 36.6 113.7 107.1 EBITDA $ 48.1 $ 91.0 $ 325.3 $ 341.0 Special items, before tax 82.0 19.9 89.6 36.5 Interest expense included in special items (10.0) — (10.0) — Depreciation and amortization included in special items (0.8) (0.9) (4.0) (0.1) Adjusted EBITDA $ 119.3 $ 110.0 $ 400.9 $ 377.4 NEWS RELEASE Attachment 1