EX-4.2





 Exhibit 4.2 
  

 
 



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

COMMON STOCK 
PAR VALUE $0.001 
COMMON STOCK 
Certificate Number 
ZQ00000000 
Shares 
* * 000000 ****************** 
* * * 000000 ***************** **** 000000 ****************
***** 000000 *************** ****** 000000 
OMEGA THERAPEUTICS, INC.

INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE 
THIS CERTIFIES THAT

is the owner of 
SEE REVERSE FOR CERTAIN DEFINITIONS 
CUSIP XXXXXX XX X 
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 
Omega 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 
DATED
DD-MMM-YYYY 
COUNTERSIGNED AND REGISTERED: 
COMPUTERSHARE TRUST COMPANY, N.A. 
TRANSFER AGENT AND REGISTRAR, 
By 
AUTHORIZED SIGNATURE 
Omega Therapeutics, Inc. 
PO BOX 505006, Louisville, KY 40233-5006 
MR A SAMPLE 
DESIGNATION (IF ANY) ADD 1 ADD 2 ADD 3 ADD 4 
CUSIP/IDENTIFIER Holder ID 
Insurance Value Number of Shares DTC 
Certificate Numbers 
1234567890/1234567890 1234567890/1234567890 1234567890/1234567890
1234567890/1234567890 1234567890/1234567890 1234567890/1234567890 
Total Transaction 
XXXXXX XX X XXXXXXXXXX 
1,000,000.00 123456 12345678 123456789012345 
Num/No. Denom. Total 
1 1 1 
2 2 2 
3 3 3 
4 4 4 
5 5 5 
6 6 6 
7 












 



 
 OMEGA THERAPEUTICS, INC. 
THE COMPANY WILL FURNISH
WITHOUT CHARGE TO EACH SHAREHOLDER WHO SO REQUESTS, A SUMMARY OF THE POWERS, DESIGNATIONS, PREFERENCES AND RELATIVE, PARTICIPATING, OPTIONAL OR OTHER SPECIAL RIGHTS OF EACH CLASS OF STOCK OF THE COMPANY AND THE QUALIFICATIONS, LIMITATIONS OR
RESTRICTIONS OF SUCH PREFERENCES AND RIGHTS, AND THE VARIATIONS IN RIGHTS, PREFERENCES AND LIMITATIONS DETERMINED FOR EACH SERIES, WHICH ARE FIXED BY THE CERTIFICATE OF INCORPORATION OF THE COMPANY, AS AMENDED, AND THE RESOLUTIONS OF THE BOARD OF
DIRECTORS OF THE COMPANY, AND THE AUTHORITY OF THE BOARD OF DIRECTORS TO DETERMINE VARIATIONS FOR FUTURE SERIES. SUCH REQUEST MAY BE MADE TO THE OFFICE OF THE SECRETARY OF THE COMPANY OR TO THE TRANSFER AGENT. THE BOARD OF DIRECTORS MAY REQUIRE THE
OWNER OF A LOST OR DESTROYED STOCK CERTIFICATE, OR HIS LEGAL REPRESENTATIVES, TO GIVE THE COMPANY A BOND TO INDEMNIFY IT AND ITS TRANSFER AGENTS AND REGISTRARS AGAINST ANY CLAIM THAT MAY BE MADE AGAINST THEM ON ACCOUNT OF THE ALLEGED LOSS OR
DESTRUCTION OF ANY SUCH 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: 
TEN COM - as tenants in common UNIF GIFT MIN ACT - Custodian 
(Cust) (Minor) 
TEN ENT - as tenants by the entireties under Uniform Gifts to Minors Act

(State) 
JT TEN - as joint tenants with right of survivorship UNIF TRF MIN ACT
- Custodian (until age ) 
and not as tenants in common (Cust) 
under Uniform
Transfers to Minors Act 
(Minor) (State) 
Additional abbreviations may also be
used though not in the above list. 
PLEASE INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER OF ASSIGNEE 
For value received, hereby sell, assign and transfer unto 
(PLEASE PRINT OR TYPEWRITE NAME AND
ADDRESS, INCLUDING POSTAL ZIP CODE, OF ASSIGNEE) 
Shares of the Common Stock represented by the within Certificate, and do hereby irrevocably constitute and appoint
Attorney to transfer the said stock on the books of the within-named Company with full power of substitution in the premises. 
Dated: 20 
Signature: 
Signature: 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 whatever. 
Signature(s) Guaranteed: Medallion
Guarantee Stamp 
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. 
The IRS requires
that the named transfer agent (“we”) report the cost basis of certain shares or units acquired after January 1, 2011. If your shares or units are covered by the legislation, and you requested to sell or transfer the shares or units using a
specific cost basis calculation method, then we have processed as you requested. If you did not specify a cost basis calculation method, then we have defaulted to the first in, first out (FIFO) method. Please consult your tax advisor if you need
additional information about cost basis. If you do not keep in contact with the issuer or do not have any activity in your account for the time period specified by state law, your property may become subject to state unclaimed property laws and
transferred to the appropriate state.