of incorporation or organization) 33587 Walker Road, Avon Lake, Ohio 44012 (Address of principal executive offices) (Zip Code) Registrant’s telephone number, including area code (440) 930-1000 Securities registered pursuant to Section 12(b) of the Act: Title of each class Trading Symbol Name of each exchange on which registered Common Shares, par value $.01 per share AVNT New York Stock Exchange Securities registered pursuant to Section 12(g) of the Act: None Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Where You Can Find Additional Information Our principal executive offices are located at 33587 Walker Road, Avon Lake, Ohio 44012, and our telephone number is +1 (440) 930-1000. STOCK EXCHANGE LISTING Avient's Common Stock is listed on the New York Stock Exchange, Symbol: AVNT SHAREHOLDER INQUIRIES If you have any questions concerning your account as a shareholder, name or address changes, inquiries regarding stock certificates, or if you need tax information regarding your account, please contact our transfer agent: Equiniti Trust Company 1110 Centre Pointe Curve, Suite 101 Mendota Heights, MN 55120-4100 Phone: 1-855-598-2615 or 1-651-450-4064 www.shareowneronline.com Additional information about Avient, including current and historic copies of Annual Reports on Form 10-K and other reports filed with the Securities and Exchange Commission, is available online at www.avient.com or free of charge from: Investor Relations 33587 Walker Road Avon Lake, Ohio 44012 Phone: 440-930-1000 ANNUAL MEETING The annual meeting of shareholders of Avient will be held virtually on May 11, 2023 at 9:00 a.m.

of incorporation or organization) 33587 Walker Road, Avon Lake, Ohio 44012 (Address of principal executive offices) (Zip Code) Registrant’s telephone number, including area code (440) 930-1000 Securities registered pursuant to Section 12(b) of the Act: Title of each class Trading Symbol Name of each exchange on which registered Common Shares, par value $.01 per share AVNT New York Stock Exchange Securities registered pursuant to Section 12(g) of the Act: None Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Where You Can Find Additional Information Our principal executive offices are located at 33587 Walker Road, Avon Lake, Ohio 44012, and our telephone number is +1 (440) 930-1000. STOCK EXCHANGE LISTING Avient's Common Stock is listed on the New York Stock Exchange, Symbol: AVNT SHAREHOLDER INQUIRIES If you have any questions concerning your account as a shareholder, name or address changes, inquiries regarding stock certificates, or if you need tax information regarding your account, please contact our transfer agent: Equiniti Trust Company 1110 Centre Pointe Curve, Suite 101 Mendota Heights, MN 55120-4100 Phone: 1-855-598-2615 or 1-651-450-4064 www.shareowneronline.com Additional information about Avient, including current and historic copies of Annual Reports on Form 10-K and other reports filed with the Securities and Exchange Commission, is available online at www.avient.com or free of charge from: Investor Relations 33587 Walker Road Avon Lake, Ohio 44012 Phone: 440-930-1000 ANNUAL MEETING The annual meeting of shareholders of Avient will be held virtually on May 12, 2022 at 9:00 a.m.

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Sustainability Report | 2021 35 http://linkedinlearning.com 1000 2000 3000 4000 5000 6000 7000 8000 840 1680 2520 3360 4200 Operational and Commercial Excellence Training Lean Six Sigma underpins our continuous improvement culture. https://www.avient.com/sites/default/files/2022-03/Sustainability%20ESG%20Disclosures_Animal%20Testing%20Policy.pdf https://www.avient.com/sites/default/files/2020-07/avient-audit-committee-charter-rev-10-2019.pdf https://www.avient.com/california-transparency-act-disclosure https://www.avient.com/sites/default/files/2022-03/2022%20Senior%20Financial%20Officer%20Code%20of%20Conduct%20Policy%5B75%5D.pdf https://www.avient.com/sites/default/files/2022-05/Compensation%20Committee%20Charter%20(REV%2010-2019).pdf https://www.avient.com/sites/default/files/2020-10/avient-conflict-minerals-policy-10.2020.pdf https://www.avient.com/sites/default/files/2022-05/Avient_Environmental%20Policy_2022%20Update.pdf https://www.avient.com/sites/default/files/2021-04/eeo-updated-2020.pdf https://www.avient.com/company/policies-and-governance/global-iso-certificate-library https://www.avient.com/company/policies-and-governance/global-policy-anti-bribery-and-anti-corruption https://www.avient.com/company/policies-and-governance/global-policy-antitrust https://www.avient.com/sites/default/files/2020-07/avient-governance-and-corporate-responsibility-committee-charter-rev-2020.pdf https://www.avient.com/company/policies-and-governance/polyone-corporation-privacy-statement https://www.avient.com/sites/default/files/2022-05/Avient_ProdStewardship_Policy_2022%20Update.pdf https://www.avient.com/sites/default/files/2022-05/Avient%20Quality%20Policy.pdf https://www.avient.com/sites/default/files/2021-05/avient-responsible-care-ehs-s-policies-2021.pdf https://www.avient.com/sites/default/files/2022-05/Avient_Health_And_Safety_Policy_2022%20Update.pdf https://www.avient.com/sites/default/files/2020-10/avient-security-policy-august-2020.pdf Metrics Sustainability Report | 2021 83Sustainability Report | 2021 83 Sustainability Report | 2021 84 People Data and Metrics Total TRIR (#—Direct) 0.69 0.51 0.56 0.50 0.55 Total TRIR (#—Contractors) 0.00 0.00 0.00 0.00 0.00 Recordable Injuries (Total #) 43 35 36 37 55 Recordable Illnesses (Total #) 0 0 0 0 0 Total LTIR (#—Direct) 0.20 0.13 0.29 0.24 0.14 Total LTIR (#—Contractors) 0.00 0.00 0.00 0.00 0.00 Total Injuries of High Consequence (% of TRIR) 9 12 14 5 2 Total Fatality Rate (#—Direct) 0.00 0.00 0.00 0.00 0.00 Total Fatality Rate (#—Contractors) 0.00 0.00 0.00 0.00 0.00 Process Safety Incident Count (#) 0 0 0 0 0 Process Safety Total Incident Rate (#) 0.00 0.00 0.00 0.00 0.00 Process Safety Incident Severity Rate (#) 0.00 0.00 0.00 0.00 0.00 Transport Incidents (#—US DOT 5800/EU ADR) 0 0 0 0 0 Safety Improvements Completed (#) NA NA NA NA 10,100 EH&S Internal Audits (#) 53 53 58 37 25 Workers covered by an EH&S Management Systems (%) 100 100 100 100 100 Workers covered by an internally audited EH&S MS (%) 100 100 100 100 100 Facilities externally certified ISO45001 (or equivalent — %)* NA NA NA 52 56 Suppliers externally certified ISO45001 (% of surveyed) NA NA NA 44 56 *Certificates can be found at HYPERLINK (https://www.avient.com/company/policies-and-governance/global-iso-certificate-library) Sustainability Report | 2021 85 ENERGY1 Total Energy (GJ) 775,091 869,390 1,523,524 1,564,854 1,671,768 Energy Intensity (MWh/MT Sales) 0.86 0.91 0.95 0.98 0.95 Renewable Electricity (%) 0 0.49 0.69 31.40 43.71 Renewable Energy (%) NA NA NA 23.33 25.68 Total Self-Generated Energy (GJ) 0 3808 4588 5001 3755 Energy Saving Activities (#) 26 41 59 74 102 Annual Savings from Energy Saving Activities (MWh) 1,507 2,601 9,882 5,212 17,420 Capital Invested in Energy Savings ($MM USD) NA NA NA 2.43 1.74 PERCENT ENERGY (%) Purchased Electricity (%) 73.18 75.11 77.53 Purchased Natural Gas (%) 25.80 21.02 20.8 Purchased Steam (%) 0.00 0.00 0.00 Purchased Diesel Fuel (%) 1.02 3.87 1.68 SOURCES OF PURCHASED ELECTRICITY (%)* Non-Renewable: Coal 41.12 Non-Renewable: Natural Gas 17.51 Non-Renewable: Other Fossil Fuels 0.26 Non-Renewable: Nuclear 9.86 Non-Renewable: Oil 1.82 Renewable: Hydro 14.79 Renewable: Wind 7.94 Renewable: Solar 3.76 Renewable: Biomass 2.53 Renewable: Geothermal 0.29 Planet Data and Metrics Sustainability Report | 2021 86 EMISSIONS1 Greenhouse Gas Emissions (MT Scope 1 GHG) 21,527 11,882 18,749 21,092 18,216 Greenhouse Gas Emissions (MT Scope 2 GHG) 244,927 85,112 155,086 87,776 85,892 Greenhouse Gas Emissions (MT Scope 3 GHG)2 NA 193,483 584,622 1,440,584 2,122,338 Greenhouse Gas Emissions (MT Scope 1 & 2 GHG) 275,811 96,994 173,835 108,868 104,108 Greenhouse Gas Emissions Intensity (MT 1&2 GHG/ MT Sales) 0.35 0.38 0.39 0.25 0.21 Greenhouse Gas Emissions Intensity (MT 1&2 GHG/$B Revenue) 84,674 36,723 43,666 28,778 21,605 Annual GHG Emissions Avoidance from ESA & WMP (MT) 1,548 2,508 8,377 10,184 26,490 Reportable Releases (above permitted limits) 0 0 0 0 0 EMISSIONS OF SOx/NOx/VOC/HAPS (MT) SOx 0.05 0.06 0.08 0.08 0.08 NOx 0.05 0.06 0.09 0.08 0.09 VOC 32.18 31.14 43.58 40.26 42.95 Top 4 Hazardous Air Pollutants 0.58 0.60 0.98 1.00 1.18 Particulate Matter 24.70 23.76 33.78 30.99 32.88 WASTE Total Waste (MT) 12,453 13,396 26,065 23,709 26,277 Total Waste Intensity (Kg Waste/MT Sales) 20.18 17.79 58.27 54.16 53.51 Total Waste Intensity (MT Waste/$B Revenue) 1,572 1,357 6,547 6,267 5,453 Percent of Total Waste Recycled/Beneficially Reused (%) 57.07 62.65 48.79 47.43 47.32 Percent of Total Waste Landfilled (%) 40.77 35.11 45.82 41.82 42.76 Total Waste Landfilled (MT) 5,077 4,703 11,943 9,915 11,215 Total Non-Hazardous Waste (MT) NA 12,722 24,135 21,823 24,045 Waste Minimization Projects (#) 47 41 38 59 161 Annual Diversion from Waste Minimization Projects (MT) NA 5,892 11,019 20,052 57,681 Capital Invested in Waste Minimization ($MM USD) NA NA NA 0.71 1.72 Sustainability Report | 2021 87 HAZARDOUS WASTE Hazardous Waste US & Canada (%) NA NA 1.0 1.3 0.85 Hazardous Waste Latin America (%) NA NA 6.4 6.9 11.3 Hazardous Waste Europe (%) NA NA 51.4 60.2 45.44 Hazardous Waste Asia Pacific (%) NA NA 35.6 26.4 36.07 Hazardous Waste Middle East & Africa (%) NA NA 5.6 5.2 6.35 Total Hazardous Waste (MT) NA 674.35 1,930 1,886 2,233 WATER Total Water Withdrawal (1000 m3) 662 666 1,159 1,309 1,263 Total Water Withdrawal Intensity (m3/MT Sales) 2.64 2.57 2.59 2.99 2.57 Total Wastewater Discharge (1000 m3) NA NA 691 553 594 Wastewater Recycled (% of Total) NA NA 40.38 57.75 52.97 Total Water Related NoV (#) 0 0 0 0 0 Withdrawal & Consumed from High Water Stress Areas (% of Total) NA NA 39.3 40.8 35.3 CERTIFIED ENVIRONMENTAL MANAGEMENT SYSTEMS Facilities externally certified to ISO14001/RC14001 (%)** NA NA NA 50 52 Facilities externally certified to ISO50001 (% of high energy sites)** NA NA 10 10 10 Suppliers externally certified ISO14001 (% of surveyed) NA NA NA 70 75 Suppliers externally certified to ISO50001 (% of surveyed) NA NA NA 17 19 * Estimates—does not include renewable energy credits from Virtual Power Purchase Agreements ** Certificates can be found at HERE 1 Refer to CDP Climate Change Report for finalized Energy/Emissions information.

A larger processing window will account for the lot to lot changes between materials, without having to make process changes.3 Setting the Beginning Variables • Injection Pressure = Maximum of machine - Should not be pressure limited • Injection Velocity = Maximum of machine - This is for the injection velocity curve starting point - If flashing is an issue start slower and then increase • Injection Cut-Off Time = 15 seconds - This is only a limiting factor, needs to be above 10 seconds for velocity graph • Hold Pressure = 0 - Need to get 95% full part with a hold pressure of 0 • Hold Time = 10-15 seconds - Need to ensure gate is frozen • Screw Speed = 90% of Maximum - Unless shear sensitive material, if shear sensitive, set RPMs to optimum • Cooling Time = 10–15 seconds • Shot Size = 50% of calculated part volume • Decompression = .25in • Transfer Position = High enough to ensure a cushion - Cushion size does not matter but there must be a cushion to keep a constant pressure on the melt during hold time - Typically 0.25" is sufficient • Back Pressure = 800-1000 plastic pressure - 100–150 hydraulic pressure - Unless specified by material data sheet Determining Shot Size The shot size should be determined by calculating the combined volume of the parts and the runner system.

Saluran langsung Etika https://www.Avient.com/company/policies-and-governance/ethics-hotline Nomor Telepon Saluran Langsung Etika: 1-877-228-5410 https://www.Avient.com/company/policies-and-governance/ethics-hotline Amerika Utara Kantor Pusat Global Avon Lake, Amerika Serikat 33587 Walker Road Avon Lake, OH, Amerika Serikat 44012 Nomor Bebas Pulsa: +1 866 765 9663 Nomor Telepon: +1 440 930 1000 Faks: +1 440 930 3064 Asia Pasifik Kantor Pusat Regional Shanghai, Tiongkok 2F, Block C 200 Jinsu Road Pudong, 201206 Shanghai, Tiongkok Telepon: +86 (0) 21 6028 4888 Faks: +86 (0) 21 6028 4999 Amerika Selatan Kantor Pusat Regional Sao Paulo, Brasil Av.

+1-866-765-9663 Телефон: +1-440-930-1000 Факс: +1-440 930 3064 Азиатско-Тихоокеанский регион Региональный офис в Шанхае, Китай 2F, Block C 200 Jinsu Road Pudong, 201206 Shanghai, China Телефон: +86 (0) 21 6028 4888 Факс: +86 (0) 21 6028 4999 Южная Америка Региональный офис в Сан-Паулу, Бразилия Av.

Línea directa de ética: https://www.Avient.com/company/policies-and-governance/ethics-hotline Número de teléfono de la línea directa de ética: 1-877-228-5410 https://www.Avient.com/company/policies-and-governance/ethics-hotline Norteamérica Sede central global de Avon Lake, Estados Unidos 33587 Walker Road Avon Lake, OH, Estados Unidos 44012 Número gratuito: +1 866 765 9663 Teléfono: +1 440 930 1000 Fax: +1 440 930 3064 Asia Pacífico Sede central regional de Shanghái, China 2F, Block C 200 Jinsu Road Pudong, 201206 Shanghái, China Teléfono: +86 (0) 21 6028 4888 Fax: +86 (0) 21 6028 4999 Sudamérica Sede central regional de San Pablo, Brasil Av.

Línea Directa de Ética: https://www.Avient.com/company/policies-and-governance/ethics-hotline Número de teléfono de la Línea Directa de Ética: 1-877-228-5410 https://www.Avient.com/company/policies-and-governance/ethics-hotline Norteamérica Sede mundial de Avon Lake, Estados Unidos 33587 Walker Road Avon Lake, OH, Estados Unidos 44012 Llamada gratuita: +1 866 765 9663 Teléfono: +1 440 930 1000 Fax: +1 440 930 3064 Asia Pacífico Sede regional de Shanghái, China 2F, Bloque C 200 Jinsu Road Pudong, 201206 Shanghái, China Teléfono: +86 (0) 21 6028 4888 Fax: +86 (0) 21 6028 4999 Sudamérica Sede regional en São Paulo, Brasil Av.