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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	1460 El Camino Real Suite 100 Menlo Park CA 94025		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	2021-03-03	350	$52.07	350	No	4	P	Indirect	Directly owned by Spouse
Common Stock	Acquisiton	2021-11-15	2,014	$8.85	2,364	No	4	P	Indirect	Directly owned by Spouse

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Indirect	Directly owned by Spouse
No	4	P	Indirect	Directly owned by Spouse

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	2,069,167	Indirect	Directly owned by USVP X
Common Stock	105,012	Indirect	Directly owned by AFF X
Common Stock	95,238	Direct

Footnotes

Shares are being reported following the discovery that shares of the issuer were purchased in discretionary IRA accounts held by the spouse of the reporting person. The reporting person is not an owner of such IRA accounts. The total in Column 5 of Table I does not reflect previously reported transactions that occurred after 3/3/2021.
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.