Comparisons to prior year fourth quarter and full year financial results herein are presented on a pro forma basis such that the prior periods include the business results of APM. Refer to Attachment 7 Reconciliation of Non-GAAP Financial Measures for details regarding adjustments to previously reported results to arrive to the pro forma financial metrics. See Attachment 3 for a definition and summary of special items and Attachment 7 for a summary of pro forma adjustments associated with the APM Acquisition.

1) Intangible amortization expense for 2022 pro forma includes a preliminary estimate of Sustainable infrastructure solutions that increase energy efficiency, renewable energy, natural resource conservation and fiber optic / 5G network accessibility The non-GAAP financial measures include: net debt to pro forma adjusted EBITDA and adjusted EPS.

Clay Aquamix 186 65 Partitioning agent or filler for natural or synthetic waterborne polymers. Rutile Titanium Aquamix 124 60 White colorant and fi ller for natural and synthetic polymers. Rutile Titanium Aquamix 124 60 White colorant and fi ller for natural and synthetic polymers.

Pros: Common, easy to implement, cost-efficient Pros: Easy to implement, no change to manufacturing process Pros: Visible deterrent, consumer peace of mind

Senior management believes these measures are useful to investors because they allow for comparison to Avient's performance in prior periods without the effect of items that, by their nature, tend to obscure Avient's operating results due to the potential variability across periods based on timing, frequency and magnitude. See Attachment 3 for a definition and summary of special items and Attachment 7 for a summary of pro forma adjustments associated with the APM Acquisition. Senior management believes these measures are useful to investors because they allow for comparison to Avient's performance in prior periods without the effect of items that, by their nature, tend to obscure Avient's operating results due to the potential variability across periods based on timing, frequency and magnitude.

OnColor™ Naturals Colorants PRODUCT DESCRIPTION OnColor™ Naturals is a range of colorants formulated with natural pigments derived from plants, flowers, roots and minerals. OnColor Naturals can help. A sophisticated mix of both pigments help deliver natural aesthetics from opaque to transparent and with a strong natural statement.

Unless otherwise noted herein, all comparisons to prior year results are pro forma* for the Clariant Masterbatch acquisition. Senior management believes these measures are useful to investors because they allow for comparison to Avient's performance in prior periods without the effect of items that, by their nature, tend to obscure Avient's operating results due to the potential variability across periods based on timing, frequency and magnitude. Senior management believes these measures are useful to investors because they allow for comparison to Avient's performance in prior periods without the effect of items that, by their nature, tend to obscure Avient's operating results due to the potential variability across periods based on timing, frequency and magnitude.

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