Attachment 1 1) Attachment 4

EST to discuss the key highlights of the expected acquisition of the Dyneema business as well as its first quarter 2022 financial results. 3 Webcast Details Avient will host a webcast on Wednesday, April 20, 2022 at 9:00 a.m. To participate in the audio-only portion of the call, dial 1-844-835- 7433 (domestic) or 1-914-495-8589 (international) and provide conference ID number 4774915. To listen to this recording, dial 1-855-859- 2056 (domestic) or 1-404-537-3406 (international) and provide conference ID number 4774915.

OBRIEN RED - 1 X HC 197223#SR-14537-3 White X TS 15886-001-1

Attachment 3 1) Attachment 4

Attachment 1 1) Attachment 4

December 4 Attachment 3 Attachment 4

X RS 1884-001-1 X RS 1884-001-2 X RS 1884-001-3

KAO METALIC BROWN 3 X ET-11919-2B PGA X NT-818.B001-8000 F-1

X MF-921-001-1 Natural X MF-921-001-2 Blue X MF-921-001-3 Blue