|Guggenheim Securities||Tony Butler|
|H.C. Wainwright||Andrew Fein|
|Leerink Partners||Joseph Schwartz|
|RBC Capital Markets||Michael Yee|
|Robert W. Baird||Brian Skorney|
Please note that any opinions, estimates or forecasts regarding Proteostasis Therapeutics, Inc.’s performance made by these analysts are theirs alone and do not represent opinions, forecasts or predictions of Proteostasis Therapeutics, Inc. or its management. Proteostasis Therapeutics, Inc. does not by its reference above or distribution imply its endorsement of or concurrence with such information, conclusions or recommendations.