X0306 4 2021-11-15 0001122976 AVIENT CORP AVNT 0001632842 Kunkle Lisa K. AVIENT CENTER 33587 WALKER ROAD AVON LAKE OH 44012 1 SVP Gnrl Counsel & Secretary Common Stock 2021-11-15 4 M 0 10400 23.08 A 80010 D Common Stock 2021-11-15 4 D 0 5984 59.58 D 74026 D Common Stock 2021-11-15 4 M 0 7100 35.07 A 81126 D Common Stock 2021-11-15 4 D 0 5476 59.58 D 75650 D Common Stock 2021-11-15 4 M 0 8500 38.27 A 84150 D Common Stock 2021-11-15 4 D 0 6809 59.58 D 77341 D Common Stock 2021-11-15 4 M 0 11500 24.98 A 88841 D Common Stock 2021-11-15 4 D 0 7784 59.58 D 81057 D Common Stock 2021-11-16 4 S 0 11447 60.2237 D 69610 D Common Stock 1986.271 I Savings Plan Trust Stock Appreciation Rights 23.08 2021-11-15 4 M 0 10400 0 D 2023-02-15 Common Stock 10400 0 D Stock Appreciation Rights 35.07 2021-11-15 4 M 0 7100 0 D 2024-02-11 Common Stock 7100 0 D Stock Appreciation Rights 38.27 2021-11-15 4 M 0 8500 0 D 2025-02-04 Common Stock 8500 0 D Stock Appreciation Rights 24.98 2021-11-15 4 M 0 11500 0 D 2026-02-10 Common Stock 11500 0 D The sale price is a weighted average for the sale transactions. The sales prices range from a low of $59.44 per share to a high of $60.84. Full information regarding the number of shares sold at each separate price is available upon request by the Commission staff, Avient Corporation or a security holder of Avient Corporation. The information in this report is based on a Avient Retirement Savings Plan statement as of November 15, 2021. SARs become exercisable and vest only upon the achievement of both price and time requirements. To vest, each one-third of the grant must attain 10%, 15% and 20% stock appreciation, respectively (which must be maintained for a minimum of thirty consecutive trading days) from the grant date closing price of $23.08 per share and no more than one-third of the grant can vest per year during the first three years. SARs become exercisable and vest only upon the achievement of both price and time requirements. To vest, each one-third of the grant must attain 10%, 15% and 20% stock appreciation, respectively (which must be maintained for a minimum of thirty consecutive trading days) from the grant date closing price of $35.07 per share and no more than one-third of the grant can vest per year during the first three years. SARs become exercisable and vest only upon the achievement of both price and time requirements. To vest, each one-third of the grant must attain 10%, 15% and 20% stock appreciation, respectively (which must be maintained for a minimum of thirty consecutive trading days) from the grant date closing price of $38.27 per share and no more than one-third of the grant can vest per year during the first three years. SARs become exercisable and vest only upon the achievement of both price and time requirements. To vest, each one-third of the grant must attain 10%, 15% and 20% stock appreciation, respectively (which must be maintained for a minimum of thirty consecutive trading days) from the grant date closing price of $24.98 per share and no more than one-third of the grant can vest per year during the first three years. /s/ Lisa K. Kunkle 2021-11-17