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 Certificate No: 2997-2006-AQ-RGC-RvA Initial certification date: 08 June, 2006 Valid: 11 April, 2022 – 11 April, 2025 This is to certify that the management system of Polyone - Suzhou, China EM Sector, 77 Shenggang Street, Suzhou Industrial Park, Suzhou, Jiangsu, China, 215024 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 Plastic Compounding Material Certificate No: 2997-2006-AQ-RGC-RvA Place and date: Shanghai, 27 April, 2022 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 - 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. Park, Pudong, 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 Masterbatch Certificate No: 7071-1998-AQ-RGC-RvA Place and date: Shanghai, 19 March, 2021 Lack of fulfilment of conditions as set out in the Certification Agreement may render this Certificate invalid. 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. 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. 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.

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2. There are a number of things to consider when selecting the right material. Material Datasets Available A number of material characterization data sets are available in .udb, moldex 3D, and SIMPOE format.

Great Place To Work We know that investing in our associates is critical to accomplishing our business goals and sustaining a great place to work culture.

AVIENT CORPORATION I N V E S T O R P R E S E N T A T I O N (NYSE: AVNT) AU G U S T 2 0 2 2 DISCLAIMER Forward-Looking Statements Certain statements contained in or incorporated by reference into this presentation constitute “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. They are based on management’s expectations that involve a number of business risks and uncertainties, any of which could cause actual results to differ materially from those expressed in or implied by the forward-looking statements. Three Months Ended June 30, 2022 Three Months Ended June 30, 2021 Reconciliation to Condensed Consolidated Statements of Income $ EPS $ EPS Net income attributable to Avient shareholders $ 84.7 $ 0.92 $ 68.8 $ 0.74 Special items, after tax 5.1 0.06 11.7 0.13 Adjusted net income / EPS - excluding special items 89.8 0.98 80.5 0.87 FX adjustment n/a n/a $ (4.9) $ (0.05) Adjusted net income / EPS - excluding special items, adjusted for FX $ 89.8 $ 0.98 $ 75.6 $ 0.82 Reconciliation to Consolidated Statements of Income Three Months Ended June 30, 2022 2021 Results Results FX Adjustment FX Adjusted Sales: Color, Additives and Inks $ 649.1 $ 624.4 $ (35.8) $ 588.6 Specialty Engineered Materials 243.9 240.6 (10.5) 230.1 Distribution 443.2 404.4 (0.2) 404.2 Corporate and eliminations (33.8) (34.2) (1.2) (35.4) Sales $ 1,302.4 $ 1,235.2 $ (47.7) $ 1,187.5 Operating income: Color, Additives and Inks $ 93.6 $ 86.3 $ (5.2) 81.1 Specialty Engineered Materials 36.6 37.3 (1.3) 36.0 Distribution 27.1 23.7 — 23.7 Corporate and eliminations (27.8) (39.2) 0.2 (39.0) Operating income 129.5 108.1 (6.3) 101.8 Special items in operating income 4.3 14.2 — 14.2 Adjusted operating income $ 133.8 $ 122.3 $ (6.3) $ 116.0 1 June 30, 2022 GAAP Special Adjusted Operating Income $ 129.5 $ 4.3 $ 133.8 Income before income taxes $ 114.7 $ 3.4 $ 118.1 Income tax expense - GAAP (30.0) — (30.0) Income tax impact of special items — (0.8) (0.8) Tax adjustments — 2.5 2.5 Net income attributable to noncontrolling interests — — — Net income attributable to Avient shareholders $ 84.7 $ 5.1 $ 89.8 EPS $ 0.92 0.06 $ 0.98 Weighted-average diluted shares 92.1 92.1 92.1 June 30, 2021 GAAP Special Adjusted Operating Income $ 108.1 $ 14.2 $ 122.3 Income before income taxes $ 89.8 $ 14.2 $ 104.0 Income tax expense - GAAP (20.4) — (20.4) Income tax impact of special items — (3.4) (3.4) Tax adjustments — 0.9 0.9 Net income attributable to noncontrolling interests (0.6) — (0.6) Net income attributable to Avient shareholders $ 68.8 $ 11.7 $ 80.5 EPS $ 0.74 0.13 $ 0.87 Weighted-average diluted shares 92.4 92.4 92.4 September 30, 2021 GAAP Special Adjusted Operating income $ 78.7 $ 20.0 $ 98.7 Income from continuing operations before income taxes $ 61.1 $ 19.9 $ 81.0 Income tax expense - GAAP (8.5) — (8.5) Income tax impact of special items — (4.6) (4.6) Tax adjustments — (3.6) (3.6) Net income attributable to noncontrolling interests 0.3 — 0.3 Net income from continuing operations attributable to Avient shareholders $ 52.9 $ 11.7 $ 64.6 Net income / EPS $ 0.57 $ 0.13 $ 0.70 Weighted-average diluted shares 92.2 92.2 92.2 Reconciliation of EBITDA by Segment Year Ended December 31, 2021 Operating income: Color, Additives and Inks $ 303.1 Specialty Engineered Materials 132.0 Distribution 93.2 Corporate and eliminations (147.1) Operating income $ 381.2 Items below OI in Corporate: Other income, net $ (1.3) Depreciation & amortization: Color, Additives and Inks $ 105.7 Specialty Engineered Materials 31.7 Distribution 0.8 Corporate and eliminations 7.7 Depreciation & Amortization $ 145.9 EBITDA: Color, Additives and Inks $ 408.8 Specialty Engineered Materials 163.7 Distribution 94.0 Corporate and eliminations (140.7) EBITDA $ 525.8 June 30, Year Ended December 31, Reconciliation to EBITDA and Adjusted EBITDA: 2022 2021 2021 Net income from continuing operations – GAAP $ 84.7 $ 69.4 $ 230.6 Income tax expense 30.0 20.4 74.0 Interest expense 16.2 19.5 75.3 Depreciation and amortization from continuing operations 36.5 33.8 145.9 EBITDA $ 167.4 $ 143.1 $ 525.8 Special items, before tax 3.4 14.2 57.1 Depreciation and amortization included in special items (1.1) 1.4 (1.7) Adjusted EBITDA $ 169.7 $ 158.7 $ 581.2 AVNT Aug 2022 Presentation w Non GAAP Recs.pdf AVNT Aug 2022 Presentation Update.pdf Avient corporation�investor presentation DISCLAIMER Avient: Who We Are Who we are – Vision, Strategy, Culture What we do: material science Sustainability for a Better Tomorrow Slide Number 7 Slide Number 8 Slide Number 9 Q2 2022 SALES AND OPERATING INCOME�(Total Company) Slide Number 11 Slide Number 12 2021 Sustainability Report Slide Number 14 Slide Number 15 Slide Number 16 Slide Number 17 Slide Number 18 Slide Number 19 Two-Year Leverage model our Specialty Journey continues End Market transformation to less cyclical industries�(with Dyneema, ex. distribution) End-market Focus for �New innovation Slide Number 24 PEER COMPARISONS Avient is asset light High free cash flow conversion Our valuation versus peers Slide Number 29 Slide Number 30 Slide Number 31 Slide Number 32 FIT with Four Pillar Strategy AVNT Aug 2022 Presentation w Non GAAP Recs v1 Dyneema® overview AVNT Aug 2022 Presentation w Non GAAP Recs AVNT Aug 2022 Presentation Update.pdf Slide Number 35 Slide Number 36 Dyneema® in the Value Chain Demand trends Products Avient’s Existing Composites Portfolio Avient’s Composites Portfolio�Sales and Ebitda Slide Number 42 �2021 segment, end market and Geography Slide Number 44 Slide Number 45 Slide Number 46 Slide Number 47 AVNT Aug 2022 Presentation w Non GAAP Recs.pdf AVNT Q2 2022 Earnings Presentation - Website.pdf AVNT Q2 2022 Earnings Presentation - Website AVNT Q2 2022 Earnings Presentation - Website AVNT Q2 2022 Earnings Presentation - Website 7.25 323pm IR Deck - AVNT-2022.06.30.pdf AVNT Aug 2022 Presentation w Non GAAP Recs

Versaflex™ Thermoplastic Elastomers Customized a soft (Shore A) TPE solution that passed strict tests, including thermal deformation (80°C for 2 hours), UV resistance, and assembly resistance Our pre-colored formations streamline production and improve global consistency

But some plastics are also in places they shouldn’t be, like in our oceans and rivers. That’s why Avient joined the Alliance to End Plastic Waste as a founding member in 2018 and is collaborating with more than 40 global organizations to promote infrastructure, education and engagement, innovation, and clean up efforts to keep plastic waste in the right place.

For and on behalf of BSI: Carlos Pitanga, Chief Operating Officer Assurance – Americas Certification Date: 2018-07-11 Latest Issue: 2018-07-11 Expiry Date: 2021-07-10 BSI Certificate Number: 85585 IATF Number: 0315491 Page: 1 of 2 This certificate remains the property of BSI and shall be returned immediately upon request. IATF Contracted Office: BSI Assurance UK Limited, registered in England under number 7805321 at 389 Chiswick High Road, London W4 4AL, UK. Including the following remote support functions: Polyone Corporation 33587 Walker Road Avon Lake, OH 44012 USA Audited by ABS Quality evaluations Product Design, Purchasing, Customer Service and Strategic Planning Location Registered Activities BSI Certificate Number: 85585 IATF Number: 0315491 Certification Date: 2018-07-11 Latest Issue: 2018-07-11 Expiry Date: 2021-07-10 Page: 2 of 2 This certificate remains the property of BSI and shall be returned immediately upon request.