News Release - AVNT-2021.12.31-News Release 1 NEWS RELEASE FOR IMMEDIATE RELEASE Avient Announces Record Fourth Quarter and Full Year 2021 Results Financial Performance • Fourth quarter and full year sales increased 21% to $1.2 billion and 27% to $4.8 billion, respectively • Fourth quarter and full year GAAP EPS of $0.32 and $2.51 compared to $0.81 and $1.46 in the prior year • Fourth quarter and full year adjusted EPS increased 12% to $0.58 and 58% to $3.05, respectively • Initiates 2022 guidance of $5.1 billion in sales and $3.50 in adjusted EPS Milestone Achievements • Increased dividend on an annualized basis by 12% to $0.95; the 11th year in a row of an annual increase • Increased EBITDA contribution from Clariant acquisition from $133 to $205 million and reduced net debt to adjusted EBITDA to 2.2x, one year ahead of schedule • Joined the United Nations Global Compact, recognized as one of America’s Most Responsible Companies by Newsweek, and earned the company's third consecutive Great Place to Work® certification. In December, we completed our annual employee engagement survey and received our 3rd consecutive Great Place to Work® certification from the Great Place to Work Institute.” 3 2022 Outlook “As we discussed during our Investor Day in December, we have momentum in growing sustainable solutions, solving healthcare challenges and broadening advanced composite applications,” said Jamie A.

Within the limits of Article 5, Seller warrants good and clear title in goods subject to the sale and that the Product conforms at the time of shipment to a Certificate of Analysis, a Certificate of Compliance, or a Product Specification Sheet, if any such document exists, and other specifications signed by Seller (“Specifications”).

We are proud to share that our associates feel we are a Great Place to Work® and, in 2023, we received our fifth certification. We hold the American Chemistry Council's certification as a Responsible Care Management System® (RCMS) company. The RCMS certification affirms the importance Avient places on having world-class environmental, health, safety and security performance.

Review disclosures made to the Audit Committee by the Company’s CEO and CFO during their certification process for reports on Form 10-K and Form 10-Q about any significant deficiencies in the design or operation of internal controls and procedures or material weaknesses therein and 4 any fraud involving management or other employees who have a significant role in the Company’s internal controls and procedures. 10.

Seller warrants good and clear title in goods subject to the sale (“Product”) and that the Product conforms at the time of shipment to a Certificate of Analysis, a Certificate of Compliance, or a Product Specification Sheet, if any such document exists, and other specifications signed by Seller (“Specifications”).

Seller warrants good and clear title in goods subject to the sale (“Product”) and that the Product conforms at the time of shipment to a Certificate of Analysis, a Certificate of Compliance, or a Product Specification Sheet, if any such document exists, and other specifications signed by Seller (“Specifications”).

P O L Y O N E C O R P O R A T I O N Exhibit 31.1 CERTIFICATION I, Stephen D. P O L Y O N E C O R P O R A T I O N Exhibit 32.2 CERTIFICATION PURSUANT TO 18 U.S.C. ANNUAL CERTIFICATIONS PolyOne Corporation included as Exhibits 31.1 and 31.2 to its Annual Report on Form 10-K for 2011, filed with the Securities and Exchange Commission, certificates of its Chief Executive Officer and Chief Financial Officer certifying the quality of PolyOne’s public disclosure.

We hold the American Chemistry Council's certification as a Responsible Care Management System® (RCMS) company. s/ Ernst & Young LLP Cleveland, Ohio February 22, 2023 Exhibit 31.1 CERTIFICATION I, Robert M. AVIENT CORPORATION Exhibit 32.2 CERTIFICATION PURSUANT TO 18 U.S.C.

Further, we recently achieved the American Chemistry Council's certification as a Responsible Care Management System® (RCMS) company. Wulfsohn POLYONE CORPORATION68 Exhibit 31.1 CERTIFICATION I, Robert M. POLYONE CORPORATION Exhibit 32.2 CERTIFICATION PURSUANT TO 18 U.S.C.

Seller warrants good and clear title in goods subject to the sale (“Product”) and that the Product con- forms at the time of shipment to a Certificate of Analysis, a Cer- tificate of Compliance, or a Product Specification Sheet, if any such document exists, and other specifications signed by Seller (“Specifications”). Säljaren garanterar att de produkter som är föremål för försäljningen (”Produkten”) är fria från rättsliga fel och att Produkten vid leveranstidpunkten stämmer överens med ett så kallat ”Certificate of Analysis”, ett ”Certificate of Compliance” eller ett ”Product Specification Sheet”, om något sådant existerar, och med andra specifikationer undertecknade av Säljaren (”Specifikationer”).