EST to discuss the key highlights of the expected acquisition of the Dyneema business as well as its first quarter 2022 financial results. 3 Webcast Details Avient will host a webcast on Wednesday, April 20, 2022 at 9:00 a.m. To participate in the audio-only portion of the call, dial 1-844-835- 7433 (domestic) or 1-914-495-8589 (international) and provide conference ID number 4774915. To listen to this recording, dial 1-855-859- 2056 (domestic) or 1-404-537-3406 (international) and provide conference ID number 4774915.

Scope 1 Base year start January 1, 2019 Base year end December 31, 2019 Base year emissions (metric tons CO2e) 18,709 Comment Scope 2 (location-based) Base year start January 1, 2019 Base year end December 31, 2019 Base year emissions (metric tons CO2e) 143,505 Comment Scope 2 (market-based) Base year start January 1, 2019 Base year end December 31, 2019 Base year emissions (metric tons CO2e) 155,023 Comment Scope 3 category 1: Purchased goods and services Base year start January 1, 2019 Avient CDP Climate Change Questionnaire 2022 Friday, July 29, 2022 58 Base year end December 31, 2019 Base year emissions (metric tons CO2e) 484,421 Comment Scope 3 category 2: Capital goods Base year start January 1, 2019 Base year end December 31, 2019 Base year emissions (metric tons CO2e) 0 Comment Scope 3 category 3: Fuel-and-energy-related activities (not included in Scope 1 or 2) Base year start January 1, 2019 Base year end December 31, 2019 Base year emissions (metric tons CO2e) 5,512 Comment Scope 3 category 4: Upstream transportation and distribution Base year start January 1, 2019 Base year end December 31, 2019 Base year emissions (metric tons CO2e) 0 Comment Avient CDP Climate Change Questionnaire 2022 Friday, July 29, 2022 59 Scope 3 category 5: Waste generated in operations Base year start January 1, 2019 Base year end December 31, 2019 Base year emissions (metric tons CO2e) 6,234 Comment Scope 3 category 6: Business travel Base year start January 1, 2019 Base year end December 31, 2019 Base year emissions (metric tons CO2e) 6,479 Comment Scope 3 category 7: Employee commuting Base year start January 1, 2019 Base year end December 31, 2019 Base year emissions (metric tons CO2e) 12,578 Comment Scope 3 category 8: Upstream leased assets Base year start January 1, 2019 Base year end December 31, 2019 Base year emissions (metric tons CO2e) 2,718 Avient CDP Climate Change Questionnaire 2022 Friday, July 29, 2022 60 Comment Scope 3 category 9: Downstream transportation and distribution Base year start January 1, 2019 Base year end December 31, 2019 Base year emissions (metric tons CO2e) 46,417 Comment Scope 3 category 10: Processing of sold products Base year start January 1, 2019 Base year end December 31, 2019 Base year emissions (metric tons CO2e) 0 Comment Scope 3 category 11: Use of sold products Base year start January 1, 2019 Base year end December 31, 2019 Base year emissions (metric tons CO2e) 0 Comment Scope 3 category 12: End of life treatment of sold products Base year start January 1, 2019 Base year end December 31, 2019 Avient CDP Climate Change Questionnaire 2022 Friday, July 29, 2022 61 Base year emissions (metric tons CO2e) 0 Comment Scope 3 category 13: Downstream leased assets Base year start January 1, 2019 Base year end December 31, 2019 Base year emissions (metric tons CO2e) 0 Comment Scope 3 category 14: Franchises Base year start January 1, 2019 Base year end December 31, 2019 Base year emissions (metric tons CO2e) 0 Comment Scope 3 category 15: Investments Base year start January 1, 2019 Base year end December 31, 2019 Base year emissions (metric tons CO2e) 0 Comment Scope 3: Other (upstream) Base year start January 1, 2019 Avient CDP Climate Change Questionnaire 2022 Friday, July 29, 2022 62 Base year end December 31, 2019 Base year emissions (metric tons CO2e) 0 Comment Scope 3: Other (downstream) Base year start January 1, 2019 Base year end December 31, 2019 Base year emissions (metric tons CO2e) 0 Comment C5.3 (C5.3) Select the name of the standard, protocol, or methodology you have used to collect activity data and calculate emissions. Purchased feedstock Percentage of Scope 3, Category 1 tCO2e from purchased feedstock Explain calculation methodology Carbon black 1 Purchased carbon black data was obtained in weight. Energy Energy consumption ISO14064-3 As part of our verification process for scope 1, scope 2, and pertinent Scope 3 categories, Avient also verified total energy consumption for all scope 1 and 2 sources. 1 1AvientRY 2021 CDP Verification Opinion Declaration_07-26-22r.pdf Avient CDP Climate Change Questionnaire 2022 Friday, July 29, 2022 108 C11.

All materials in this range are formulated to comply with ISO 10993-4 and -5, REACH SVHC, and RoHS.   All the materials are manufactured in ISO 13485-2016 certified sites and supported by testing to ISO 10993-1, USP, EP, and ICH Q3D protocols. Avient is exhibiting at Pharmapack in Hall 7.2, booth D70, at the Paris Expo in Porte de Versailles, France, February 1-2, 2023.

NOTE: On July 1, 2020, PolyOne and Clariant Masterbatches joined together as Avient, a new kind of materials company focused on conquering customer challenges and unlocking the potential for innovation and sustainability around the globe. About Avient Avient Corporation (NYSE: AVNT), with 2019 pro forma revenues of $4 billion, provides specialized and sustainable material solutions that transform customer challenges into opportunities, bringing new products to life for a better world. Michelle Maniscalco Senior Manager, Marketing Communications Avient Corporation +1 440-930-1988 michelle.maniscalco@avient.com

TR BLUE T205-1-4 Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

26100GNS GENESIS DARK BROWN 4 87680GNS GENESIS OLD GOLD 1 Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

APOLLO COOL GREY 4 Internal 1 Pack MB-1P E1210HR WHT1271 Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

XS1054A Alt PE 1 854T SKY COOL GRAY ST801 4% Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

DM691#4 NON PIGMENTED NON-PHTHALATE YLWPWDMB (1% CT 10 YELLOW) 950 Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)

ABS BLUE TINT 25:1 CC DILUTED PIPE GREY 4 Shipment Notification - under "Material Header" MSDS - labeled as the "Product Number" (in Section 1)