ii NOTICE OF 2022 ANNUAL MEETING OF SHAREHOLDERS Thursday, May 12, 2022 9:00 a.m. Please carefully review the proxy materials for the Annual Meeting, which will be held virtually via live webcast on Thursday, May 12, 2022 at 9:00 a.m. The Annual Meeting webcast will begin promptly at 9:00 a.m.

CCS Customer Centric Selling 1000 2000 3000 4000 5000 6000 7000 8000 Associates Trained in LSS (Cumulative) LSS Projects Completed (Cumulative) 2009 2011 2013 2015 2017 2019 500 1000 1500 2000 2500 3000 3500 2009 2011 2013 2015 2017 2019 Sustainability Report | 2019 24 Since 2013, the executive leadership selects 14–16 high performing, high potential associates each year to participate in the NextGen leadership development program. Additionally, these TPEs reduce VOCs, fogging and odor for vehicle interiors. Sustainability Report | 2019 86 Total TRIR (#—Direct) 0.74 0.69 0.51 0.56 Total TRIR (#—Contractors) 0.00 0.00 0.00 0.00 Recordable Injuries (Total #) 51 43 35 36 Recordable Illnesses (Total #) 0 0 0 0 Total LTIR (#—Direct) 0.29 0.20 0.13 0.29 Total LTIR (#—Contractors) 0.00 0.00 0.00 0.00 Total Fatality Rate (#—Direct) 0.00 0.00 0.00 0.00 Total Fatality Rate (#—Contractors) 0.00 0.00 0.00 0.00 Process Safety Incident Count (#) 0 0 0 0 Process Safety Total Incident Rate (#) 0.00 0.00 0.00 0.00 Process Safety Incident Severity Rate (#) 0.00 0.00 0.00 0.00 Residual Risk Reduction (# of assessments) NA NA 13,267 7,102 Residual Risk Point Reduction (#) NA NA 1,035,177 864,997 EH&S Internal Audits (#) 40 53 53 58 Workers covered by an EH&S Management Systems (%) 100 100 100 100 Workers covered by an internally audited EH&S MS (%) 100 100 100 100 Facilities covered by an externally certified EH&S MS (%) 20 24 30 35 Transport Incidents (#—US DOT 5800/EU ADR) 0 0 0 0 Capital Invested in EH&S ($MM USD) 5.305 5.201 8.858 7.870 Sustainability Report | 2019 87 ENERGY Total Energy (GJ) 677,579 775,091 869,390 899,679 Energy Intensity (MWh/MT Production) 0.99 0.86 0.91 0.85 Renewable Energy (%) 0 0 0.49 0.69 Total Self-Generated Energy (GJ) 0 0 3808 4588 Energy Saving Activities (#) NA 26 45 60 Cumulative Annual Savings from Energy Saving Activities (MWh) 0 1,507 2,609 6,879 PERCENT ENERGY (%) Purchased Electricity 73.18 Purchased Natural Gas 25.80 Purchased Steam 0.00 Purchased Diesel Fuel 1.02 EMISSIONS Greenhouse Gas Emissions (MT Scope 1 GHG) 33,362 21,527 11,882 12,767 Greenhouse Gas Emissions (MT Scope 2 GHG) 238,100 244,927 85,112 87,427 Greenhouse Gas Emissions (MT Scope 3 GHG) NA NA 193,483 584,622 Greenhouse Gas Emissions (MT Scope 1 & 2 GHG) 254,995 275,811 96,994 100,194 Greenhouse Gas Emissions Intensity (MT 1&2 GHG/ MT Production) 0.43 0.35 0.38 0.34 Greenhouse Gas Emissions Intensity (MT 1&2 GHG/$B Revenue) 76,346 84,674 36,723 37,872 Cumulative Annual GHG Emissions Avoidance from ESAs (MT) 0 1,548 2,609 6,879 Reportable Releases (Above Permitted Limits) 0 0 0 0 EMISSIONS OF SOx/NOx/VOC/HAPS SOx (MT) 0.04 0.05 0.06 0.06 NOx (MT) 0.05 0.05 0.06 0.06 VOC (MT) 30.28 32.18 31.14 29.22 Top 4 Hazardous Air Pollutants (MT) 0.49 0.58 0.60 0.55 Particulate Matter (MT) 23.29 24.70 23.76 22.21 WASTE Total Waste (MT) 11,234 12,453 13,396 13,273 Total Waste Intensity (Kg Waste/MT Production) 17.23 20.18 17.79 19.70 Total Waste Intensity (MT Waste/$B Revenue) 993 1,572 1,357 2,008 Percent of Total Waste Recycled/ Beneficially Reused (%) 67.31 57.07 62.65 51.87 Percent of Total Waste Landfilled (%) 29.55 40.77 35.11 43.88 Total Hazardous Waste (MT) NA NA 674.35 730.26 Waste Minimization Projects (#) NA 47 44 68 WATER Total Water Withdrawal (1000 m3) 498 662 666 565 Total Water Withdrawal Intensity (m3/MT Production) 2.58 2.64 2.57 1.91 Total Water Related NoV (#) 0 0 0 0 Withdrawal & Consumed from High Water Stress Areas (% of Total) NA NA NA 22.1 Sustainability Report | 2019 88 INDICES Sustainability Report | 2019 89Sustainability Report | 2019 89 GRI Standards Content Index Organizational Profile 102–1 Name of the organization About Avient—Who We Are 102–2 Activities, brands, products, and services Products—All Sections Avient products are not banned in any market. 102–3 Location of headquarters PolyOne 2019 Annual Report—Form 10-K Cover Page 102–4 Location of operations About Avient—Where We Are: Global Locations PolyOne 2019 Annual Report—Form 10-K Page 11 102–5 Ownership and legal form PolyOne 2019 Annual Report—Form 10-K Cover Page 102–6 Markets served About Avient—Communities Counting on Avient 102–7 Scale of the organization Performance—Performance Overview PolyOne 2019 Annual Report—Form 10-K Pages 2–10 & 15 102–8 Information on employees and other workers People—All Sections PolyOne 2019 Annual Report—Form 10-K Pages 2 & 4 Currently we report on the number of associates.

CCS Customer Centric Selling 1000 2000 3000 4000 5000 6000 7000 8000 Associates Trained in LSS (Cumulative) LSS Projects Completed (Cumulative) 2009 2011 2013 2015 2017 2019 500 1000 1500 2000 2500 3000 3500 2009 2011 2013 2015 2017 2019 Sustainability Report | 2019 24 Since 2013, the executive leadership selects 14–16 high performing, high potential associates each year to participate in the NextGen leadership development program. Additionally, these TPEs reduce VOCs, fogging and odor for vehicle interiors. Sustainability Report | 2019 86 Total TRIR (#—Direct) 0.74 0.69 0.51 0.56 Total TRIR (#—Contractors) 0.00 0.00 0.00 0.00 Recordable Injuries (Total #) 51 43 35 36 Recordable Illnesses (Total #) 0 0 0 0 Total LTIR (#—Direct) 0.29 0.20 0.13 0.29 Total LTIR (#—Contractors) 0.00 0.00 0.00 0.00 Total Fatality Rate (#—Direct) 0.00 0.00 0.00 0.00 Total Fatality Rate (#—Contractors) 0.00 0.00 0.00 0.00 Process Safety Incident Count (#) 0 0 0 0 Process Safety Total Incident Rate (#) 0.00 0.00 0.00 0.00 Process Safety Incident Severity Rate (#) 0.00 0.00 0.00 0.00 Residual Risk Reduction (# of assessments) NA NA 13,267 7,102 Residual Risk Point Reduction (#) NA NA 1,035,177 864,997 EH&S Internal Audits (#) 40 53 53 58 Workers covered by an EH&S Management Systems (%) 100 100 100 100 Workers covered by an internally audited EH&S MS (%) 100 100 100 100 Facilities covered by an externally certified EH&S MS (%) 20 24 30 35 Transport Incidents (#—US DOT 5800/EU ADR) 0 0 0 0 Capital Invested in EH&S ($MM USD) 5.305 5.201 8.858 7.870 Sustainability Report | 2019 87 ENERGY Total Energy (GJ) 677,579 775,091 869,390 899,679 Energy Intensity (MWh/MT Production) 0.99 0.86 0.91 0.85 Renewable Energy (%) 0 0 0.49 0.69 Total Self-Generated Energy (GJ) 0 0 3808 4588 Energy Saving Activities (#) NA 26 45 60 Cumulative Annual Savings from Energy Saving Activities (MWh) 0 1,507 2,609 6,879 PERCENT ENERGY (%) Purchased Electricity 73.18 Purchased Natural Gas 25.80 Purchased Steam 0.00 Purchased Diesel Fuel 1.02 EMISSIONS Greenhouse Gas Emissions (MT Scope 1 GHG) 33,362 21,527 11,882 12,767 Greenhouse Gas Emissions (MT Scope 2 GHG) 238,100 244,927 85,112 87,427 Greenhouse Gas Emissions (MT Scope 3 GHG) NA NA 193,483 584,622 Greenhouse Gas Emissions (MT Scope 1 & 2 GHG) 254,995 275,811 96,994 100,194 Greenhouse Gas Emissions Intensity (MT 1&2 GHG/ MT Production) 0.43 0.35 0.38 0.34 Greenhouse Gas Emissions Intensity (MT 1&2 GHG/$B Revenue) 76,346 84,674 36,723 37,872 Cumulative Annual GHG Emissions Avoidance from ESAs (MT) 0 1,548 2,609 6,879 Reportable Releases (Above Permitted Limits) 0 0 0 0 EMISSIONS OF SOx/NOx/VOC/HAPS SOx (MT) 0.04 0.05 0.06 0.06 NOx (MT) 0.05 0.05 0.06 0.06 VOC (MT) 30.28 32.18 31.14 29.22 Top 4 Hazardous Air Pollutants (MT) 0.49 0.58 0.60 0.55 Particulate Matter (MT) 23.29 24.70 23.76 22.21 WASTE Total Waste (MT) 11,234 12,453 13,396 13,273 Total Waste Intensity (Kg Waste/MT Production) 17.23 20.18 17.79 19.70 Total Waste Intensity (MT Waste/$B Revenue) 993 1,572 1,357 2,008 Percent of Total Waste Recycled/ Beneficially Reused (%) 67.31 57.07 62.65 51.87 Percent of Total Waste Landfilled (%) 29.55 40.77 35.11 43.88 Total Hazardous Waste (MT) NA NA 674.35 730.26 Waste Minimization Projects (#) NA 47 44 68 WATER Total Water Withdrawal (1000 m3) 498 662 666 565 Total Water Withdrawal Intensity (m3/MT Production) 2.58 2.64 2.57 1.91 Total Water Related NoV (#) 0 0 0 0 Withdrawal & Consumed from High Water Stress Areas (% of Total) NA NA NA 22.1 Sustainability Report | 2019 88 INDICES Sustainability Report | 2019 89Sustainability Report | 2019 89 GRI Standards Content Index Organizational Profile 102–1 Name of the organization About Avient—Who We Are 102–2 Activities, brands, products, and services Products—All Sections Avient products are not banned in any market. 102–3 Location of headquarters PolyOne 2019 Annual Report—Form 10-K Cover Page 102–4 Location of operations About Avient—Where We Are: Global Locations PolyOne 2019 Annual Report—Form 10-K Page 11 102–5 Ownership and legal form PolyOne 2019 Annual Report—Form 10-K Cover Page 102–6 Markets served About Avient—Communities Counting on Avient 102–7 Scale of the organization Performance—Performance Overview PolyOne 2019 Annual Report—Form 10-K Pages 2–10 & 15 102–8 Information on employees and other workers People—All Sections PolyOne 2019 Annual Report—Form 10-K Pages 2 & 4 Currently we report on the number of associates.

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i NOTICE OF 2024 ANNUAL MEETING OF SHAREHOLDERS Thursday, May 16, 2024 9:00 a.m. Please carefully review the proxy materials for the Annual Meeting, which will be held virtually via live webcast on Thursday, May 16, 2024 at 9:00 a.m. The Annual Meeting webcast will begin promptly at 9:00 a.m.

Wenden Sie sich bei der ersten Gelegenheit an die Rechtsabteilung von Avient und dokumentieren Sie den Vorfall. 10 Nordamerika Globale Hauptverwaltung Avon Lake, USA 33587 Walker Road Avon Lake, OH, USA 44012 Gebührenfrei: 1-866-765-9663 Telefon: 1-440-930-1000 Fax: +440 930 3064 Asien-Pazifik Regionale Hauptverwaltung Shanghai, China 2F, Block C 200 Jinsu Road Pudong, 201206 Shanghai, China Telefon: +86 (0) 21 6028 4888 Fax: +86 (0) 21 6028 4999 Südamerika Regionale Hauptverwaltung São Paulo, Brasilien Av.

Bắc Mỹ Trụ sở chính Avon Lake, Hoa Kỳ 33587 Walker Road Avon Lake, OH, Hoa Kỳ 44012 Số điện thoại miễn phí: +1 866 765 9663 Điện thoại: +1 440 930 1000 Fax: +1 440 930 3064 Châu Á Thái Bình Dương Trụ sở Khu vực Thượng Hải, Trung Quốc 2F, Block C 200 Đường Jinsu Phố Đông, 201206 Thượng Hải, Trung Quốc Điện thoại: +86 (0) 21 6028 4888 Fax: +86 (0) 21 6028 4999 Nam Mỹ Trụ sở Khu vực Sao Paulo, Brazil Av.