CUSIP No. 82835W 10 8 13G 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 Silverback Therapeutics, Inc. is filed on behalf of each of us.

Dated: February 16, 2021

Nextech VI Oncology SCSp

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

By:	/s/ Dalia Bleyer
	Dalia Bleyer, Managing Member
By:	/s/ Rocco Sgobbo
	Rocco Sgobbo, Managing Member

Nextech VI GP S.à r.l.
By:	/s/ Dalia Bleyer
	Dalia Bleyer, Managing Member
By:	/s/ Rocco Sgobbo
	Rocco Sgobbo, Managing Member

/s/ Rocco Sgobbo

Rocco Sgobbo

/s/ Dalia Bleyer

Dalia Bleyer

/s/ Ian Charoub

Ian Charoub