EX-4.1





 Exhibit 4.1 
  

	
	





 ZQ|CERT#|COY|CLS|RGSTRY|ACCT#|TRANSTYPE|RUN#|TRANS#

COMMON STOCK 
PAR VALUE $0.0001 
CERTIFICATE NUMBER 
ZQ00000000 
FOGHORN® 
THERAPEUTICS 
FOGHORN THERAPEUTICS, INC. 
INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE 
THIS CERTIFIES THAT 
** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr.
Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample
**** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David
Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander
David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr.
Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample
**** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David
Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Alexander David Sample **** Mr. Sample **** Mr. Sample 
MR. SAMPLE & MRS. SAMPLE
& 
MR. SAMPLE & MRS. SAMPLE 
is the owner of 
**000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares***
*000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****
000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****0
00000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****00
0000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000
000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****0000
00**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****00000
0**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000
**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000*
*Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**
Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**Shares****000000**S ***ZERO HUNDRED THOUSAND 
ZERO HUNDRED AND ZERO*** 
COMMON STOCK 
Shares 
* * 000000* * * * * * * * * * * * * * * * * * 
* * * 000000* * * * * * * * * * * * * * * * * 
* * * * 000000* * * * * * * * * * * * * * * *

* * * * * 000000* * * * * * * * * * * * * * * 
* * * * * * 000000* * * * * * *
* * * * * * * 
SEE REVERSE FOR CERTAIN DEFINITIONS 
CUSIP 344174 10 7

THIS CERTIFICATE IS TRANSFERABLE IN CITIES DESIGNATED BY THE TRANSFER AGENT, AVAILABLE ONLINE AT 
www.computershare.com 
FULLY-PAID AND NON-ASSESSABLE SHARES OF COMMON STOCK OF 
Foghorn Therapeutics, Inc. (hereinafter called the “Company”), transferable on the books of the Company in person or by duly authorized attorney, upon surrender of this
Certificate properly endorsed. This Certificate and the shares represented hereby, are issued and shall be held subject to all of the provisions of the Certificate of Incorporation, as amended, and the By-Laws, as amended, of the Company (copies of
which are on file with the Company and with the Transfer Agent), to all of which each holder, by acceptance hereof, assents. This Certificate is not valid unless countersigned and registered by the Transfer Agent and Registrar. 
Witness the facsimile seal of the Company and the facsimile signatures of its duly authorized officers. 
FACSIMILE SIGNATURE TO COME 
President 
FACSIMILE SIGNATURE TO COME 
Secretary 
Foghorn Therapeutics, Inc. 
CO R PO RATE 
SEAL 
10/02/2015 
DELAWAR E 
DATED DD-MMM-YYYY 
COUNTERSIGNED AND REGISTERED: COMPUTERSHARE TRUST COMPANY, N.A. TRANSFER AGENT AND REGISTRAR,

By 
AUTHORIZED SIGNATURE 
SECURITY INSTRUCTIONS ON REVERSE 
FOGHORN® 
THERAPEUTICS 
PO BOX 505006, Louisville, KY 40233-5006 
MR A SAMPLE 
DESIGNATION (IF ANY) 
ADD 1 
ADD 2 
ADD 3 
ADD 4 
CUSIP/IDENTIFIER XXXXXX XX X 
Holder ID XXXXXXXXXX 
Insurance Value 1,000,000.00 
Number of Shares 123456 
DTC 12345678 123456789012345 
Certificate Numbers Num/No. Denom. Total 
1234567890/1234567890 1 1 1 
1234567890/1234567890 2 2 2 
1234567890/1234567890 3 3 3 
1234567890/1234567890 4 4 4 
1234567890/1234567890 5 5 5 
1234567890/1234567890 6 6 6 
Total Transaction 7 
1234567