Webcast Details Avient will provide additional details on its 2025 second quarter and its 2025 full year outlook during its webcast scheduled for 8:00 a.m.

There is a broad spectrum of TPEs available that have higher flow lengths, however, there are some limitations at certain durometers—particularly with harder formulations that measure greater than 50 Shore A durometer.

TPE materials are quantified based on Shore hardness, which is a material’s resistance to indenture on a 6.3- mm minimum thickness molded plaque (ASTM D2240).

The loss of a soft-touch feel in thinner overmolds will be especially pronounced in low-durometer materials such as the 3, 13 and 33 Shore A materials shown in Figure 10.

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Versaflex™ Thermoplastic Elastomers Customized a soft (Shore A) TPE solution that passed strict tests, including thermal deformation (80°C for 2 hours), UV resistance, and assembly resistance

Versaflex™ Thermoplastic Elastomers Customized a soft (Shore A) TPE solution that passed strict tests, including thermal deformation (80°C for 2 hours), UV resistance, and assembly resistance

SHAREHOLDER INQUIRIES If you have any questions concerning your account as a shareholder, name or address changes, inquiries regarding stock certificates, or if you need tax information regarding your account, please contact our transfer agent: Equiniti Trust Company 1110 Centre Pointe Curve, Suite 101 Mendota Heights, MN 55120-4100 Phone: 1-855-598-2615 or 1-651-450-4064 www.shareowneronline.com Additional information about PolyOne, including current and historic copies of Annual Reports on Form 10-K and other reports filed with the Securities and Exchange Commission, is available online at www.polyone.com or free of charge from: Investor Affairs Relations PolyOne Corporation 33587 Walker Road Avon Lake, Ohio 44012 Phone: 440-930-1000 ANNUAL MEETING The annual meeting of shareholders of PolyOne will be held May 14, 2020 at 9:00 a.m. at PolyOne’s Corporate headquarters, 33587 Walker Road, Avon Lake, Ohio.

A-1 MESSAGE FROM OUR CEO March 29, 2018 Dear Fellow Shareholder: You are cordially invited to attend the PolyOne Corporation Annual Meeting of Shareholders (the “Annual Meeting”), which will be held at 9:00 a.m. on Thursday, May 17, 2018, at PolyOne Corporation’s corporate headquarters located at PolyOne Center, 33587 Walker Road, Avon Lake, Ohio 44012. NOTICE OF 2018 ANNUAL MEETING OF SHAREHOLDERS Thursday, May 17, 2018 9:00 a.m. Please carefully review the proxy materials for the Annual Meeting, which will be held on Thursday, May 17, 2018 at 9:00 a.m.

Fearon President and Chief Executive Officer Non-Executive Chairman of the Board Please refer to the accompanying materials for voting instructions. i Notice of 2025 Annual Meeting of Shareholders Wednesday, May 14, 2025 9:00 a.m. Please carefully review the proxy materials for the Annual Meeting, which will be held virtually via live webcast on Wednesday, May 14, 2025 at 9:00 a.m. The Annual Meeting webcast will begin promptly at 9:00 a.m.