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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	Director	Officer	Large Shareholder	Other
1474322	M Casey Tansey	1460 El Camino Real, Suite 100 Menlo Park CA 94025	No	No	Yes	No
1734819	U.s. Venture Partners Xii, L.p.	1460 El Camino Real, Suite 100 Menlo Park CA 94025	No	No	Yes	No
1734820	Presidio Management Group Xii, L.l.c.	1460 El Camino Real, Suite100 Menlo Park CA 94025	No	No	Yes	No
1754875	U.s. Venture Partners Xii-A, L.p.	1460 El Camino Real, Suite 100 Menlo Park CA 94025	No	No	Yes	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	1,779,969	$0.00	1,779,969	No	4	C	Indirect	By U.S. Venture Partners XII, L.P.
Common Stock	Acquisiton	2020-12-08	289,198	$0.00	2,069,167	No	4	C	Indirect	By U.S. Venture Partners XII, L.P.
Common Stock	Acquisiton	2020-12-08	90,335	$0.00	90,335	No	4	C	Indirect	By U.S. Venture Partners XII-A, L.P.
Common Stock	Acquisiton	2020-12-08	14,677	$0.00	105,012	No	4	C	Indirect	By U.S. Venture Partners XII-A, L.P.
Common Stock	Acquisiton	2020-12-08	47,619	$21.00	47,619	No	4	P	Indirect	Directly owned by Tansey

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	C	Indirect	By U.S. Venture Partners XII, L.P.
No	4	C	Indirect	By U.S. Venture Partners XII, L.P.
No	4	C	Indirect	By U.S. Venture Partners XII-A, L.P.
No	4	C	Indirect	By U.S. Venture Partners XII-A, L.P.
No	4	P	Indirect	Directly owned by Tansey

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Preferred Series B Stock	Disposition	2020-12-08	6,609,027	$0.00	1,779,969	$0.00
Common Stock	Preferred Series B Stock	Disposition	2020-12-08	335,417	$0.00	90,335	$0.00
Common Stock	Preferred Series C Stock	Disposition	2020-12-08	1,073,793	$0.00	289,198	$0.00
Common Stock	Preferred Series C 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.
Series B and Series C Preferred Stock automatically converted into shares of the Issuer's Common Stock immediately upon the closing of the Issuer's imitial public offering, for no additional consideration at a rate of 1 share of Common Stock for each 3.713 shares of Preferred Stock, based on the conversion price currently in effect. The Preferred Stock had no expiration date.
Presidio Management Group XII, L.L.C. ("PMG XII"), the general partner of each of U.S. Venture Partners XII, L.P. and U.S. Venture Partners XII-A, L.P. (together, the "USVP XII Funds"), has sole voting and dispositive power with respect to the shares held by the USVP XII. Casey Tansey is the sole managing partner of PMG XII and may be deemed to have voting and dispositive power over the reported securities held by the USVP XII Funds, and each of the foregoing persons disclaims beneficial ownership of such securities, except to the extent of any pecuniary interest therein.