EX-4.1





 Exhibit 4.1 
  





 
 Exhibit 4.1 
SILVERBACK 
THERAPEUTICS 
NUMBER 
SHARES 
SB

INCORPORATED UNDER THE CUSIP 82835W 10 8 
LAWS OF THE STATE SEE REVERSE FOR
CERTAIN 
OF DELAWARE DEFINITIONS AND LEGENDS 
This certifies that 
BY: AMERICAN COUNTERSIGNED 
is the record holder of STOCK AND 
FULLY PAID AND NONASSESSABLE SHARES OF COMMON STOCK, $0.0001 PAR VALUE PER SHARE, OF (BROOKLYN,

Silverback Therapeutics, Inc. 
transferable on the books of the Corporation in
person or by duly authorized attorney upon surrender of this Certificate properly NY) 
endorsed. This Certificate is not valid until countersigned by the Transfer
Agent and registered by the Registrar. TRUST& TRANSFER REGISTERED: 
WITNESS the facsimile seal of the Corporation and the facsimile signatures of its duly
authorized officers. 
Dated: AUTHORIZED AND TRANSFER COMPANY, 
KTHERAP E

A C RPORA UTI LLC 
R 
E B CO T E C , SIGNATURE REGISTRAR AGENT 
V SEAL S I 
CHIEF EXECUTIVE OFFICER L N SECRETARY 












 



 
 The Corporation shall furnish without charge to each stockholder who so requests a statement of the powers, designations, 
preferences and relative, participating, optional or other special rights of each class of stock of the Corporation or series thereof 
and the qualifications, limitations or restrictions of such preferences and/or rights. Such requests shall be made to the Corporation’s 
Secretary at the principal office of the Corporation. 
KEEP THIS CERTIFICATE IN A SAFE PLACE.
IF IT IS LOST, STOLEN, OR DESTROYED THE CORPORATION WILL REQUIRE 
A BOND INDEMNITY AS A CONDITION TO THE ISSUANCE OF A REPLACEMENT CERTIFICATE. 
The following abbreviations, when used in the inscription on the face of this certificate, shall be construed as though they were written out in full according to applicable

laws or regulations: 
Additional abbreviations may also be used though not in
the above list. 
TEN COM – as tenants in common 
TEN ENT – as tenants
by the entireties 
JT TEN – as joint tenants with right of 
survivorship
and not as tenants 
in common 
COM PROP – as community property

UNIF GIFT MIN ACT Custodian (Cust) (Minor) 
under Uniform Gifts to Minors

Act (State) 
UNIF TRF MIN ACT Custodian (until age ) 
(Cust) 
under Uniform Transfers 
(Minor) 
to Minors Act (State) 
FOR VALUE RECEIVED, hereby sell(s), assign(s) and transfer(s) unto 
PLEASE INSERT SOCIAL
SECURITY OR OTHER 
IDENTIFYING NUMBER OF ASSIGNEE 
shares 
of the capital stock represented by within Certificate, and do hereby irrevocably constitute and appoint 
attorney-in-fact 
to transfer the said stock on the books of the within named Corporation with
full power of the substitution in the premises. 
Dated 
NOTICE: THE SIGNATURE
TO THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME AS WRITTEN UPON THE 
FACE OF THE CERTIFICATE IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT OR ANY

CHANGE WHATSOEVER. 
By 
THE SIGNATURE(S) SHOULD BE GUARANTEED BY AN ELIGIBLE GUARANTOR INSTITUTION, (BANKS, STOCKBROKERS, 
SAVINGS AND LOAN ASSOCIATIONS AND CREDIT UNIONS WITH MEMBERSHIP IN AN APPROVED SIGNATURE

GUARANTEE MEDALLION PROGRAM), PURSUANT TO S.E.C. RULE 17Ad-15. GUARANTEES BY A NOTARY PUBLIC ARE NOT 
ACCEPTABLE. SIGNATURE GUARANTEES MUST NOT BE DATED. 
Signature(s) Guaranteed: 
(PLEASE PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)