JOINT FILING AGREEMENT This JOINT FILING AGREEMENT is made and entered into by and among Iridian Asset Management LLC, David L. Cohen and Harold J. Levy. The parties to this Agreement hereby agree to prepare jointly and file timely (or otherwise deliver as appropriate) all filings on Schedule 13D and Schedule 13G (the “Filings”) required to be filed by them pursuant to Section 13(d) or 13(g) under the Securities Exchange Act of 1934, as amended, with respect to their respective ownership of any securities of Allegheny Technologies Incorporated that are required to be reported on any Filings. Each party to this Agreement further agrees and covenants to the other parties that it will fully cooperate with such other parties in the preparation and timely filing (and other delivery) of all such Filings.
Date:   June 6, 2017
	IRIDIAN ASSET MANAGEMENT LLC
	By:	/s/ Jeffrey M. Elliott ___________________________ Jeffrey M. Elliott
	Title:		Executive Vice President
	David L. Cohen
	By:	/s/ Jeffrey M. Elliott ___________________________ Jeffrey M. Elliott
	Title:		Agent
	Harold J. Levy
	By:	/s/ Jeffrey M. Elliott ___________________________ Jeffrey M. Elliott
	Title:		Agent