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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1671858	Silverback Therapeutics Inc.	SBTX	()	4

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1225480	D Jonathan Root	C/O Silverback Therapeutics, Inc. 500 Fairview Avenue N, Suite 600 Seattle WA 98109		Yes	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2020-12-08	95,238	$21.00	95,238	No	4	P	Direct
Common Stock	Acquisiton	2020-12-08	1,779,969	$0.00	1,779,969	No	4	C	Indirect	By U.S VenturePartners XII,L.P.
Common Stock	Acquisiton	2020-12-08	289,198	$0.00	2,069,167	No	4	C	Indirect	By U.S VenturePartners XII,L.P.
Common Stock	Acquisiton	2020-12-08	90,335	$0.00	90,335	No	4	C	Indirect	By U.S.VenturePartners XII-A,L.P.
Common Stock	Acquisiton	2020-12-08	14,677	$0.00	105,012	No	4	C	Indirect	By U.S.VenturePartners XII-A,L.P.

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Direct
No	4	C	Indirect	By U.S VenturePartners XII,L.P.
No	4	C	Indirect	By U.S VenturePartners XII,L.P.
No	4	C	Indirect	By U.S.VenturePartners XII-A,L.P.
No	4	C	Indirect	By U.S.VenturePartners XII-A,L.P.

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Series B Preferred Stock	Disposition	2020-12-08	6,609,027	$0.00	1,779,969	$0.00
Common Stock	Series B Preferred Stock	Disposition	2020-12-08	335,417	$0.00	90,335	$0.00
Common Stock	Series C Preferred Stock	Disposition	2020-12-08	1,073,793	$0.00	289,198	$0.00
Common Stock	Series C Preferred Stock	Disposition	2020-12-08	54,496	$0.00	14,677	$0.00

Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
No	4	C	Indirect
No	4	C	Indirect
No	4	C	Indirect
No	4	C	Indirect

Footnotes

The shares were purchased in the Issuer's initial public offering.
All outstanding shares of Preferred Stock automatically converted into shares of Common Stock immediately upon the closing of the Issuer's initial public offering, for no additional consideration at a rate of one share of Common Stock for each 3.713 shares of Preferred Stock, based on the conversion price currently in effect. The Preferred Stock has no expiration date.
Presidio Management Group XII, L.L.C. (PMG XII), the general partner of U.S. Venture Partners XII, L.P. and U.S. Venture Partners XII-A, L.P. (together, USVP XII), has sole voting and dispositive power with respect to the shares held by USVP XII. The reporting person is a managing member of PMG XII, and shares voting and dispositive power with respect to the shares held by USVP XII. The reporting person disclaims beneficial ownership of such holdings, except to the extent of his pecuniary interest in the shares.