Exhibit 99.1

JOINT FILING STATEMENT

We, the undersigned, hereby express our agreement that the attached statement on Schedule 13G relating to the Common Stock of IDEAYA Biosciences, Inc. is filed on behalf of each of us.

Dated: February 13, 2020

Nextech V Oncology, S.C.S., SICAV-SIF

By:	Nextech V GP S.à r.l.
Its:	General Partner

By:	/s/ Dalia Bleyer
	Dalia Bleyer, Managing Member
By:	/s/ James Pledger
	James Pledger, Managing Member

Nextech V GP S.à r.l.
By:	/s/ Dalia Bleyer
	Dalia Bleyer, Managing Member
By:	/s/ James Pledger
	James Pledger, Managing Member

Nextech IV Oncology, S.C.S. SICAV-SIF

By:	Nextech IV GP S.à r.l.
Its:	General Partner

By:	/s/ Marc Kriegsmann
	Marc Kriegsmann, Managing Member
By:	/s/ Christoph Kraiker
	Christoph Kraiker, Managing Member

Nextech IV GP S.à r.l.
By:	/s/ Marc Kriegsmann
	Marc Kriegsmann, Managing Member
By:	/s/ Christoph Kraiker
	Christoph Kraiker, Managing Member

/s/ Thomas Lips

Thomas Lips

/s/ James Pledger

James Pledger

/s/ Dalia Bleyer

Dalia Bleyer

/s/ Marc Kriegsmann

Marc Kriegsmann

/s/ Christoph Kraiker

Christoph Kraiker