Document:

Exhibit
4.1

 

[Form
of Unit Certificate]

 

NUMBER
UNITS

U-

 

SEE
REVERSE FOR CERTAIN DEFINITIONS

 

CUSIP
[         ]

 

TORTOISE
ACQUISITION CORP.

 

UNITS
CONSISTING OF ONE SHARE OF CLASS A COMMON STOCK AND

ONE-HALF OF ONE REDEEMABLE WARRANT TO PURCHASE ONE SHARE OF CLASS A COMMON STOCK

 

THIS
CERTIFIES THAT                                       
is the owner of                                                       Units.

 

Each Unit (“Unit”)
consists of one (1) share of Class A common stock, par value $0.0001 per share (“Common Stock”), of Tortoise
Acquisition Corp., a Delaware corporation (the “Company”), and one-half of one redeemable warrant (each
whole warrant, a “Warrant”). Each Warrant entitles the holder to purchase one (1) share (subject to adjustment)
of Common Stock for $11.50 per share (subject to adjustment). Each Warrant will become exercisable on the later of (i) thirty (30)
days after the Company’s completion of a merger, capital stock exchange, asset acquisition, stock purchase, reorganization
or other similar business combination with one or more businesses (each a “Business Combination”) and
(ii) twelve (12) months from the closing of the Company’s initial public offering, and will expire unless exercised before
5:00 p.m., New York City Time, on the date that is five (5) years after the date on which the Company completes its initial Business
Combination, or earlier upon redemption or liquidation (the “Expiration Date”). The Common Stock and
Warrants comprising the Units represented by this certificate are not transferable separately prior to                ,
2019, unless Barclays Capital Inc. and Goldman Sachs & Co. LLC elect to allow earlier separate trading, subject to the Company’s
filing of a Current Report on Form 8-K with the Securities and Exchange Commission containing an audited balance sheet reflecting
the Company’s receipt of the gross proceeds of the offering and issuing a press release announcing when separate trading
will begin. The terms of the Warrants are governed by a Warrant Agreement, dated as of                ,
2019, between the Company and Continental Stock Transfer & Trust Company, as Warrant Agent, and are subject to the terms and
provisions contained therein, all of which terms and provisions the holder of this certificate consents to by acceptance hereof.
Copies of the Warrant Agreement are on file at the office of the Warrant Agent at 1 State Street, 30th Floor, New York, New York
10004, and are available to any Warrant holder on written request and without cost.

 

This
certificate is not valid unless countersigned by the Transfer Agent and Registrar of the Company.

 

This
certificate shall be governed by and construed in accordance with the internal laws of the State of New York.

 

Witness
the facsimile signature of its duly authorized officers.

 

	 	 	 
	Secretary	 	Chief Executive Officer

 

     

     

    

 

Tortoise
Acquisition Corp.

 

The
Company will furnish without charge to each unitholder who so requests, a statement of the powers, designations, preferences and
relative, participating, optional or other special rights of each class of stock or series thereof of the Company and the qualifications,
limitations or restrictions of such preferences and/or rights.

 

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
                              
	TEN
    ENT	–	as
    tenants by the entireties	 	 	 	     (Cust)                              (Minor)
	 	          	 	 	 	         	 
	JT
    TEN	–	as
    joint tenants with right of survivorship and not as tenants in common	 	 	 	under
        Uniform Gifts to Minors Act

                                                                           

                                  (State)

 

Additional
abbreviations may also be used though not in the above list.

 

For
value received,                          
hereby sell, assign and transfer unto                                             

 

PLEASE
INSERT SOCIAL SECURITY OR

OTHER

IDENTIFYING
NUMBER OF ASSIGNEE

 

 

 

(PLEASE
PRINT OR TYPEWRITE NAME AND ADDRESS, INCLUDING ZIP CODE, OF ASSIGNEE)

 

 

 

 

 

 

 

 

Units
represented by the within Certificate, and do hereby irrevocably constitute and appoint Attorney to transfer the said Units on
the books of the within named Company with full power of 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
                                         whatever.

 

Signature(s)
Guaranteed:

 

	THE
SIGNATURE(S) MUST 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 SEC RULE 17Ad-15 (OR ANY SUCCESSOR RULE))
UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED.	 

 

    2

     

    

 

In
each case, as more fully described in the Company’s final prospectus dated                  , 2019, the holder(s) of this certificate shall
be entitled to receive a pro-rata portion of certain funds held in the trust account established in connection with the Company’s
initial public offering only in the event that (i) the Company redeems the shares of Class A common stock sold in its initial
public offering and liquidates because it does not consummate an initial business combination by                , 2021, (ii) the Company redeems the shares of Class A common stock sold in its initial public offering in connection with a stockholder
vote to approve an amendment to the Company’s amended and restated certificate of incorporation that would affect the substance
or timing of the Company’s obligation to redeem 100% of the Class A common stock if it does not consummate an initial business
combination by                , 2021, or (iii) if the holder(s) seek(s) to redeem for cash his,
her or its respective shares of Class A common stock in connection with a tender offer (or proxy solicitation, solely in the event
the Company seeks stockholder approval of the proposed initial business combination) setting forth the details of a proposed initial
business combination. In no other circumstances shall the holder(s) have any right or interest of any kind in or to the trust
account.

 

    3Exhibit
4.2

 

[Form
of Class A Common Stock Certificate]

 

NUMBER

 

C-

 

SHARES

SEE
REVERSE FOR

CERTAIN
DEFINITIONS

CUSIP
[     ]

 

TORTOISE
ACQUISITION CORP.

INCORPORATED UNDER THE LAWS OF THE STATE OF DELAWARE

CLASS A COMMON STOCK

 

This
Certifies that

is
the owner of

 

FULLY
PAID AND NON-ASSESSABLE SHARES OF THE PAR VALUE OF $0.0001 EACH OF THE CLASS A COMMON STOCK OF

 

TORTOISE
ACQUISITION CORP.

(THE “CORPORATION”)

 

transferable
on the books of the Corporation in person or by duly authorized attorney upon surrender of this certificate properly endorsed.
The Corporation will be forced to redeem all of its shares of Class A common stock if it is unable to complete a business combination
by      , 2021, as more fully described in the Corporation’s final prospectus dated        , 2019.

 

This
certificate is not valid unless countersigned by the Transfer Agent and registered by the Registrar.

 

Witness
the seal of the Corporation and the facsimile signatures of its duly authorized officers.

 

	Secretary	[Corporate
    Seal]

    Delaware	Chief
    Executive Officer

 

     

     

    

 

TORTOISE
ACQUISITION CORP.

 

The
Corporation will furnish without charge to each stockholder who so requests the powers, designations, preferences and relative,
participating, optional or other special rights of each class of stock or series thereof of the Corporation and the qualifications,
limitations or restrictions of such preferences and/or rights. This certificate and the shares represented thereby are issued
and shall be held subject to all the provisions of the Certificate of Incorporation and all amendments thereto and resolutions
of the Board of Directors providing for the issue of securities (copies of which may be obtained from the secretary of the Corporation),
to all of which the holder of this certificate by acceptance hereof assents. 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
                              
	TEN
    ENT	–	as
    tenants by the entireties	 	 	 	     (Cust)                              (Minor)
	 	          	 	 	 	         	 
	JT
    TEN	–	as
    joint tenants with right of survivorship and not as tenants in common	 	 	 	under
        Uniform Gifts to Minors Act

                                                                           

                                  (State)

 

Additional
abbreviations may also be used though not in the above list.

 

For
value received,                     
hereby sells, assigns and transfers unto

 

 

 

(PLEASE
INSERT SOCIAL SECURITY OR OTHER IDENTIFYING NUMBER(S) OF ASSIGNEE(S))

 

 

 

(PLEASE
PRINT OR TYPEWRITE NAME(S) AND ADDRESS(ES), INCLUDING ZIP CODE, OF ASSIGNEE(S))

 

 

 

 

 

 

 

 

Shares
of the capital stock represented by the within Certificate, and hereby irrevocably constitutes and appoints

 

Attorney
to transfer the said stock on the books of the within named Corporation with full power of substitution in the premises.

 

Dated:

 

 

NOTICE:
THE SIGNATURE(S) 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:

 

 

 

By

 

 

THE
SIGNATURE(S) MUST 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 SEC RULE 17Ad-15 (OR ANY SUCCESSOR RULE))
UNDER THE SECURITIES EXCHANGE ACT OF 1934, AS AMENDED.

 

    2

     

    

 

In
each case, as more fully described in the Corporation’s final prospectus dated         , 2019, the holder(s) of this certificate
shall be entitled to receive a pro-rata portion of certain funds held in the trust account established in connection with the
Corporation’s initial public offering only in the event that (i) the Corporation redeems the shares of Class A common stock
sold in its initial public offering and liquidates because it does not consummate an initial business combination by         , 2021, (ii)
the Corporation redeems the shares of Class A common stock sold in its initial public offering in connection with a stockholder
vote to approve an amendment to the Corporation’s amended and restated certificate of incorporation that would affect the
substance or timing of the Corporation’s obligation to redeem 100% of the Class A common stock if it does not consummate
an initial business combination by        , 2021 or (iii) if the holder(s) seek(s) to redeem for cash his, her or its respective shares
of Class A common stock in connection with a tender offer (or proxy solicitation, solely in the event the Corporation seeks stockholder
approval of the proposed initial business combination) setting forth the details of a proposed initial business combination. In
no other circumstances shall the holder(s) have any right or interest of any kind in or to the trust account.

 

    3

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