From 1985 to 2008, Mr. Rathbun — 27,438(1) 274,385(1) 548,770(1) — — — — — — 22,750(2) 182,000(2) 364,000(2) — — — — — 2/8/2021 — — — 6,717(3) 20,150(3) — 42.27 212,083 2/8/2021 — — — — — 5,050(4) — 213,464 Estimated Future Payouts Under Non-Equity Incentive Plan Awards (columns (c), (d) and (e)) (1) 2021 Annual Incentive Program Opportunities. Financial information referenced here is provided to aid in reconciling back to the most comparable GAAP figures.

The company noted that GAAP EPS includes special items (Attachment 3) and intangible amortization expense (Attachment 1). Forward-looking statements give current expectations or forecasts of future events and are not guarantees of future performance. Any forward-looking statement speaks only as of the date on which such statement is made, and we undertake no obligation to publicly update forward-looking statements, whether as a result of new information, future events or otherwise.

BASE RESIN ABS Drying Temperature 80–90°C Drying Time 2–3 Hours Barrel Temperatures °C Rear Zone 180–210 Center Zone 190–220 Front Zone 200–230 Nozzle 210–240 Mold Temperature 50–80 Screw Speed Moderate Back Pressure 3–10 bar Cushion 5–15 mm Injection Speed Low to medium Injection Pressure Moderate to high Holding Pressure 10–30% of injection pressure Screw Type General purpose Screw L/D 20:1 Screw Compression Ratio 2.0:1–2.5:1 Non-return Check Valve Free flow check ring Nozzle Type Reverse taper Barrel Capacity 30–80% of barrel should be used STARTUP & SHUTDOWN RECOMMENDATIONS Purge Compound 2–3 melt flow PP or purging compound. Draft Angle • Maintain a minimum draft angle of 1° per side. Incomplete Fill Melt and/or mold temperature too cold • Increase nozzle and barrel temperatures • Check thermocouples and heater bands Shot size • Increase shot size • Adjust transfer position to 98% full • Increase cushion • Enlarge or widen vents and increase number of vents • Check that vents are unplugged • Check that gates are unplugged • Enlarge gates and/or runners • Perform short shots to determine fill pattern and verify proper vent location • Increase wall thickness to move gas trap to parting line Brittleness Degraded/overheated material • Decrease melt temperature • Decrease back pressure • Use smaller barrel Gate location and/or size • Relocate gate to non-stress area • Increase gate size to allow higher flow rate and lower molded-in stress Wet material • Check moisture.

Forward-looking statements give current expectations or forecasts of future events and are not guarantees of future performance. Any forward-looking statement speaks only as of the date on which such statement is made, and we undertake no obligation to publicly update forward-looking statements, whether as a result of new information, future events or otherwise. # # Investor Relations Contact: Giuseppe (Joe) Di Salvo Vice President, Treasurer and Investor Relations Avient Corporation +1 440-930-1921 giuseppe.disalvo@avient.com Media Contact: Kyle G.

Forward-looking statements give current expectations or forecasts of future events and are not guarantees of future performance. Avient acquired the Clariant Color business on July 1, 2020 (the “Acquisition Date”). Avient acquired Clariant Color on July 1, 2020 (the “Acquisition Date”).