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No. 10231X Form W-9 (Rev. 10-2018) AVIENT CORPORATION AVIENT COLORANTS USA LLC ✔ 5 E 33587 WALKER ROAD AVON LAKE, OH 44012 3 4 1 7 3 0 4 8 8 1/15/2021 Form W-9 (Rev. 10-2018) Page 2 By signing the filled-out form, you: 1. Enter your name as shown on required U.S. federal tax documents on line 1. You can reach TAS by calling the TAS toll-free case intake line at 1-877-777-4778 or TTY/TDD 1-800-829-4059.

Patterson, Chairman, President and Chief Executive Officer, Avient Corporation. 1 Mr. We held our priorities firm by keeping health and safety first, providing world-class service to our customers, and utilizing our unique position to aid in recovery efforts as an essential supplier throughout the world.”2021 Outlook Commenting on the Company’s 2021 outlook, Mr. Rose Vice President, Corporate Communications Avient Corporation +1 440-930-3162 kyle.rose@avient.com 5 Attachment 1 Avient Corporation Summary of Condensed Consolidated Statements of Income (Unaudited) (In millions, except per share data) Three Months Ended December 31, Year Ended 2020年12月31日 2019 2020 2019 Sales $ 997.0 $ 658.6 $ 3,242.1 $ 2,862.7 Operating Income 65.0 20.5 189.3 156.8 Net income from continuing operations attributable to Avient shareholders 74.2 6.4 132.0 75.5 Basic earnings per share from continuing operations attributable to Avient shareholders $ 0.81 $ 0.08 $ 1.47 $ 0.98 Diluted earnings per share from continuing operations attributable to Avient shareholders $ 0.81 $ 0.08 $ 1.46 $ 0.97 Senior management uses comparisons of adjusted net income from continuing operations attributable to Avient shareholders and diluted adjusted earnings per share (EPS) from continuing operations attributable to Avient shareholders, excluding special items, to assess performance and facilitate comparability of results.

Safety Data Sheets Important information about the health, safety and environmental impacts of Avient products. Overview of how Avient serves wire & cable customers, highlighting both power and data cables technologies

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Avient verbiedt dat medewerkers werk namens Avient uitvoeren onder invloed van alcohol, illegale drugs en andere gecontroleerde stoffen. Geen enkel document kan alle mogelijke situaties behandelen. Francisco Nakasato, 1700 13295-000 Itupeva Sao Paulo, Brazil Telefoon: +55 11 4593 9200 Europa Regionaal hoofdkantoor Pommerloch, Luxemburg 19 Route de Bastogne Pommerloch, Luxembourg, L-9638 Telefoon: +352 269 050 35 Fax: +352 269 050 45 www.avient.com https://www.avient.com Erkenning van de naleving van de gedragscode van Avient Instructies: Lees en onderteken dit document en stuur het terug naar personeelszaken.

Avient’s chief operating decision maker uses these financial measures to monitor and evaluate the ongoing performance of Avient and each business segment and to allocate resources. F X ) -10% -11% -3% -12% 10 US & Canada Latin America EMEA Asia Avient ex. Avient Specialty Formulators Other Specialty / Chemical Companies 2023E(%) 32 79 87 83 81 76 73 90 79 77 76 73 69 60 22 A vi e n t K W R P P G F U L A V Y R P M F M C C E H X L A S H E C L H U N E M N S C L M U LT I P L E E X PA N S I O N Avient Specialty Formulators Other Specialty / Chemical Companies Source: Peer data per Bloomberg as of 2023年4月28日 Note: Avient reflects 2023 adjusted EBITDA guidance of $530M and closing share price of $38.51.