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. Prior to joining PolyOne, Mr. Wulfsohn 24,115 (1) Dividends paid on shares held in the Deferred Compensation Plan are reinvested in shares of PolyOne stock through a dividend reinvestment feature of the Plan.

PolyOne Announces Strong Fourth Quarter and Full Year 2013 Results GOBIE® H2O Boosts Competitive Advantage for Filtered Water Bottle with PolyOne PolyOne To Hold Fourth Quarter 2013 Conference Call

About PolyOne EDITORS: For a high-resolution image, please click here: PolyOne Super Black for Textiles To access PolyOne’s news library online, please go to www.avient.com/news

PolyOne Unveils InVisiOSM Color Inspiration 2017 PolyOne Acquires Magenta Master Fibers December 1, 2015

Morgan Conference - 3/1/2022 PolyOne IR Presentation – May 2020 PolyOne IR Presentation - Longbow Basic Materials Conference - 3/1/2016

Morgan Conference - 3/1/2022 PolyOne IR Presentation – May 2020 PolyOne IR Presentation - Longbow Basic Materials Conference - 3/1/2016

DeLuca Vice President, Investor Relations PolyOne Corporation +1 440-930-1226 isaac.deluca@avient.com Attachment 1 Special items (1):

A-1 i MESSAGE FROM OUR CEO April 1, 2016 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 12, 2016, at PolyOne Corporation’s corporate headquarters located at PolyOne Center, 33587 Walker Road, Avon Lake, Ohio 44012. Key 2015 Company Performance Results.(1) PolyOne delivered strong performance results in 2015. 2) Calculated using PolyOne’s March 1, 2016 closing stock price of $27.52.

Attachment 1 Special items (1) 1)

Swanson Director, Investor Relations PolyOne Corporation +1 440-930-1018 eric.swanson@avient.com Attachment 1 Special items (1)