EX-4.1




	
	 Exhibit 4.1
  








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

COMMON STOCK 
PAR VALUE $0.001 
COMMON STOCK 
Certificate Number 
ZQ00000000 
Translate BIO 
Shares 
TRANSLATE BIO, INC. 
INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE 
THIS CERTIFIES THAT 
MR SAMPLE & MRS SAMPLE & 
MR SAMPLE & MRS SAMPLE 
is the owner of 
ZERO HUNDRED THOUSAND 
ZERO HUNDRED AND ZERO 
SEE REVERSE FOR CERTAIN DEFINITIONS 
CUSIP 89374L 10 4 
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 
Translate Bio, 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. 
DATED DD-MMM-YYYY 
COUNTERSIGNED AND REGISTERED: 
COMPUTERSHARE TRUST COMPANY, N.A. 
TRANSFERAGENT ANDREGISTRAR, 
Chief Executive Officer 
General Counsel 
By 
AUTHORIZED SIGNATURE 
1234567 
Translate BIO 
PO BOX 43004, Providence, RI 02940-3004 
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 
Num/No. Denom. Total. 
111 
222

333 
444 
555 
666

7 
Translate _CO1_FO1_Blue_05-04-18_007_.pdf 







 



 
 TRANSLATE BIO, 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 
- a s 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 Incorporated 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.