Exhibit 10.3


 


INVESTMENT
MANAGEMENT TRUST AGREEMENT


 


This
Investment Management Trust Agreement (this “Agreement”) is made effective as of _______, 2017 by and
between Nebula Acquisition Corporation, a Delaware corporation (the “Company”), and American Stock Transfer &
Trust Company, LLC, a New York limited liability trust company (the “Trustee”).


 


WHEREAS,
the Company’s registration statement on Form S-1, No. 333-_______ (the “Registration Statement”)
and prospectus (the “Prospectus”) for the initial public offering of the Company’s units (the
“Units”), each of which consists of one share of the Company’s Class A common stock, par
value $0.0001 per share (the “Common Stock”), and one-third of one warrant, each whole warrant entitling
the holder thereof to purchase one share of Common Stock (such initial public offering hereinafter referred to as the “Offering”),
has been declared effective as of the date hereof by the U.S. Securities and Exchange Commission; and


 


WHEREAS,
the Company has entered into an Underwriting Agreement (the “Underwriting Agreement”) with Deutsche
Bank Securities Inc. and Goldman Sachs & Co. LLC as representatives (the “Representatives”) of the
several underwriters (the “Underwriters”) named therein; and


 


WHEREAS,
as described in the Prospectus, $250,000,000 of the gross proceeds of the Offering and sale of the Private Placement Warrants
(as defined in the Underwriting Agreement) (or $287,500,000 if the Underwriters’ over-allotment option is exercised in full)
will be delivered to the Trustee to be deposited and held in a segregated trust account located at all times in the United States
(the “Trust Account”) for the benefit of the Company and the holders of the Common Stock included in
the Units issued in the Offering as hereinafter provided (the amount to be delivered to the Trustee (and any interest subsequently
earned thereon) is referred to herein as the “Property,” the stockholders for whose benefit the Trustee
shall hold the Property will be referred to as the “Public Stockholders,” and the Public Stockholders
and the Company will be referred to together as the “Beneficiaries”); and


 


WHEREAS,
pursuant to the Underwriting Agreement, a portion of the Property equal to $8,750,000, or $10,062,500 if the Underwriters’
over-allotment option is exercised in full, is attributable to deferred underwriting discounts and commissions that will be payable
by the Company to the Underwriters upon and concurrently with the consummation of the Business Combination (as defined below)
(the “Deferred Discount”); and


 


WHEREAS,
the Company and the Trustee desire to enter into this Agreement to set forth the terms and conditions pursuant to which the Trustee
shall hold the Property.


  


NOW
THEREFORE, IT IS AGREED:


 


1.
Agreements and Covenants of Trustee. The Trustee hereby agrees and covenants to:


 


(a)
Hold the Property in trust for the Beneficiaries in accordance with the terms of this Agreement in the Trust Account established
by the Trustee in the United States at J.P. Morgan Chase Bank, N.A. and at a brokerage institution selected by the Trustee that
is reasonably satisfactory to the Company;


 


(b)
Manage, supervise and administer the Trust Account subject to the terms and conditions set forth herein;


 


(c)
In a timely manner, upon the written instruction of the Company, invest and reinvest the Property in United States government
securities within the meaning of Section 2(a)(16) of the Investment Company Act of 1940, as amended, having a maturity of
180 days or less, or in money market funds meeting the conditions of paragraphs (d)(1), (d)(2), (d)(3) and (d)(4) of
Rule 2a-7 promulgated under the Investment Company Act of 1940, as amended (or any successor rule), which invest only in
direct U.S. government treasury obligations, as determined by the Company; the Trustee may not invest in any other securities
or assets, it being understood that the Trust Account will earn no interest while account funds are uninvested awaiting the Company’s
instructions hereunder;


 


(d)
Collect and receive, when due, all interest or other income arising from the Property, which shall become part of the “Property,”
as such term is used herein;


 






    	 	1	 



     


    

 


(e)
Promptly notify the Company and the Representatives of all communications received by the Trustee with respect to any Property
requiring action by the Company;


 


(f)
Supply any necessary information or documents as may be requested by the Company (or its authorized agents) in connection with
the Company’s preparation of the tax returns relating to assets held in the Trust Account;


 


(g)
Participate in any plan or proceeding for protecting or enforcing any right or interest arising from the Property if, as and when
instructed by the Company to do so;


 


(h)
Render to the Company monthly written statements of the activities of, and amounts in, the Trust Account reflecting all receipts
and disbursements of the Trust Account;


 


(i)
Commence liquidation of the Trust Account only after and promptly after (x) receipt of, and only in accordance with,
the terms of a letter from the Company (“Termination Letter”) in a form substantially similar to
that attached hereto as either Exhibit A or Exhibit B, as applicable, signed on behalf of the Company
by its Chief Executive Officer, President, Chief Financial Officer, Secretary or Chairman of the board of directors of the
Company (the “Board”) or other authorized officer of the Company, and complete the liquidation of
the Trust Account and distribute the Property in the Trust Account, including interest not previously released to the Company
to pay its franchise and income taxes and up to $750,000 of interest released to the Company for working capital purposes,
only as directed in the Termination Letter and the other documents referred to therein, or (y) upon the date which is
the later of (i) 24 months after the closing of the Offering (or 27 months from the closing of the Offering if the
Company has executed a letter of intent, agreement in principle or definitive agreement for an initial business combination
within 24 months from the closing of the Offering) and (ii) such later date as may be approved by the Company’s
stockholders in accordance with the Company’s amended and restated certificate of incorporation, if a Termination
Letter has not been received by the Trustee prior to such date, in which case the Trust Account shall be liquidated in
accordance with the procedures set forth in the Termination Letter attached as Exhibit B and the Property in the
Trust Account, including interest not previously released to the Company to pay its franchise and income taxes and up to
$750,000 of interest released to the Company for working capital purposes (less up to $100,000 of interest that may be
released to the Company to pay dissolution expenses) shall be distributed to the Public Stockholders of record as of such
date; provided, however, that in the event the Trustee receives a Termination Letter in a form substantially
similar to Exhibit B hereto, or if the Trustee begins to liquidate the Property because it has received no such
Termination Letter by the date specified in clause (y) of this Section 1(i), the Trustee shall keep the Trust
Account open until twelve (12) months following the date the Property has been distributed to the Public
Stockholders;


 


(j)
Upon written request from the Company, which may be given from time to time in a form substantially similar to that attached hereto
as Exhibit C, withdraw from the Trust Account and distribute to the Company the amount of interest earned on the Property
requested by the Company to cover any income or franchise tax obligation owed by the Company as a result of assets of the Company
or interest or other income earned on the Property and up to $750,000 for working capital expenses, which amount shall be delivered
directly to the Company by electronic funds transfer or other method of prompt payment, and the Company shall forward such payment
to the relevant taxing authority; provided, however, that to the extent there is not sufficient cash in the Trust
Account to pay such tax obligation or available for working capital, the Trustee shall liquidate such assets held in the Trust
Account as shall be designated by the Company in writing to make such distribution so long as there is no reduction in the principal
amount initially deposited in the Trust Account; provided, further, that if the tax to be paid is a franchise tax,
the written request by the Company to make such distribution shall be accompanied by a copy of the franchise tax bill from the
State of Delaware for the Company and a written statement from the principal financial officer of the Company setting forth the
actual amount payable. The written request of the Company referenced above shall constitute presumptive evidence that the Company
is entitled to said funds, and the Trustee shall have no responsibility to look beyond said request;


 






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(k)
Upon written request from the Company, which may be given from time to time in a form substantially similar to that attached hereto
as Exhibit D, the Trustee shall distribute to the Public Stockholders of record as of such date the amount requested
by the Company to be used to redeem shares of Common Stock from Public Stockholders properly submitted in connection with a stockholder
vote to approve an amendment to the Company’s amended and restated certificate of incorporation to modify the substance
or timing of the Company’s obligation to redeem 100% of its public shares of Common Stock if the Company has not consummated
an initial Business Combination within such time as is described in the Company’s amended and restated certificate of incorporation.
The written request of the Company referenced above shall constitute presumptive evidence that the Company is entitled to distribute
said funds, and the Trustee shall have no responsibility to look beyond said request; and


 


(l)
Not make any withdrawals or distributions from the Trust Account other than pursuant to Section 1(i), (j) or (k) above.


 


2.
Agreements and Covenants of the Company. The Company hereby agrees and covenants to:


 


(a)
Give all instructions to the Trustee hereunder in writing, signed by the Company’s Chairman of the Board, President, Chief
Executive Officer, Chief Financial Officer or Secretary. In addition, except with respect to its duties under Sections 1(i),
1(j) and 1(k) hereof, the Trustee shall be entitled to rely on, and shall be protected in relying on,
any verbal or telephonic advice or instruction which it, in good faith and with reasonable care, believes to be given by any one
of the persons authorized above to give written instructions, provided that the Company shall promptly confirm such instructions
in writing;


 


(b)
Subject to Section 4 hereof, hold the Trustee harmless and indemnify the Trustee from and against any and all expenses,
including reasonable counsel fees and disbursements, or losses suffered by the Trustee in connection with any action taken by
it hereunder and in connection with any action, suit or other proceeding brought against the Trustee involving any claim, or in
connection with any claim or demand, which in any way arises out of or relates to this Agreement, the services of the Trustee
hereunder, or the Property or any interest earned on the Property, except for expenses and losses resulting from the Trustee’s
gross negligence, fraud or willful misconduct. Promptly after the receipt by the Trustee of notice of demand or claim or the commencement
of any action, suit or proceeding, pursuant to which the Trustee intends to seek indemnification under this Section 2(b),
it shall notify the Company in writing of such claim (hereinafter referred to as the “Indemnified Claim”).
The Trustee shall have the right to conduct and manage the defense against such Indemnified Claim; provided that the Trustee
shall obtain the consent of the Company with respect to the selection of counsel, which consent shall not be unreasonably withheld
or delayed. The Trustee may not agree to settle any Indemnified Claim without the prior written consent of the Company, which
such consent shall not be unreasonably withheld or delayed. The Company may participate in such action with its own counsel;


 


(c)
Pay the Trustee the fees set forth on Schedule A hereto, including an initial acceptance fee, annual administration fee,
and transaction processing fee which fees shall be subject to modification by the parties from time to time. It is expressly understood
that the Property shall not be used to pay such fees unless and until it is distributed to the Company pursuant to Sections
1(i) through 1(j) hereof. The Company shall pay the Trustee the initial acceptance fee and the first annual
administration fee at the consummation of the Offering. The Trustee shall refund to the Company the monthly fee (on a pro rata
basis) with respect to any period after the liquidation of the Trust Account. The Company shall not be responsible for any other
fees or charges of the Trustee except as set forth in this Section 2(c), Schedule A and as may be provided
in Section 2(b) hereof;


 


(d)
In connection with any vote of the Company’s stockholders regarding a merger, capital stock exchange, asset acquisition,
stock purchase, reorganization or similar business combination involving the Company and one or more businesses (the “Business
Combination”), provide to the Trustee an affidavit or certificate of the inspector of elections for the stockholder
meeting verifying the vote of such stockholders regarding such Business Combination;


 


(e)
Provide the Representatives with a copy of any Termination Letter(s) and/or any other correspondence that is sent to the
Trustee with respect to any proposed withdrawal from the Trust Account promptly after it issues the same;


 






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(f)
Instruct the Trustee to make only those distributions that are permitted under this Agreement, and refrain from instructing the
Trustee to make any distributions that are not permitted under this Agreement; and


 


(g)
Within four (4) business days after the Underwriters exercise the over-allotment option (or any unexercised portion thereof)
or such over-allotment expires, provide the Trustee with a notice in writing of the total amount of the Deferred Discount, which
shall in no event be less than $10,500,000.


 


3.
Limitations of Liability. The Trustee shall have no responsibility or liability to:


 


(a)
Imply obligations, perform duties, inquire or otherwise be subject to the provisions of any agreement or document other than this
Agreement and that which is expressly set forth herein;


 


(b)
Take any action with respect to the Property, other than as directed in Section 1 hereof, and the Trustee shall have
no liability to any third party except for liability arising out of the Trustee’s gross negligence, fraud or willful misconduct;


 


(c)
Institute any proceeding for the collection of any principal and income arising from, or institute, appear in or defend any proceeding
of any kind with respect to, any of the Property unless and until it shall have received instructions from the Company given as
provided herein to do so and the Company shall have advanced or guaranteed to it funds sufficient to pay any expenses incident
thereto;


 


(d)
Refund any depreciation in principal of any Property;


 


(e)
Assume that the authority of any person designated by the Company to give instructions hereunder shall not be continuing unless
provided otherwise in such designation, or unless the Company shall have delivered a written revocation of such authority to the
Trustee;


 


(f)
The other parties hereto or to anyone else for any action taken or omitted by it, or any action suffered by it to be taken or
omitted, in good faith and in the Trustee’s reasonable best judgment, except for the Trustee’s gross negligence, fraud
or willful misconduct. The Trustee may rely conclusively and shall be protected in acting upon any order, notice, demand, certificate,
opinion or advice of counsel (including counsel chosen by the Trustee, which counsel may be the Company’s counsel), statement,
instrument, report or other paper or document (not only as to its due execution and the validity and effectiveness of its provisions,
but also as to the truth and acceptability of any information therein contained) which the Trustee believes, in good faith and
with reasonable care, to be genuine and to be signed or presented by the proper person or persons. The Trustee shall not be bound
by any notice or demand, or any waiver, modification, termination or rescission of this Agreement or any of the terms hereof,
unless evidenced by a written instrument delivered to the Trustee, signed by the proper party or parties and, if the duties or
rights of the Trustee are affected, unless it shall give its prior written consent thereto;


 


(g)
Verify the accuracy of the information contained in the Registration Statement;


 


(h)
Provide any assurance that any Business Combination entered into by the Company or any other action taken by the Company is as
contemplated by the Registration Statement;


 


(i)  File information returns with respect to the Trust Account with any local, state or federal taxing authority or provide periodic
written statements to the Company documenting the taxes payable by the Company, if any, relating to any interest income earned
on the Property;


 


(j)  Prepare, execute and file tax reports, income or other tax returns and pay any taxes with respect to any income generated by,
and activities relating to, the Trust Account, regardless of whether such tax is payable by the Trust Account or the Company,
including, but not limited to, franchise and income tax obligations, except pursuant to Section 1(j) hereof;
or


 






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(k)
Verify calculations, qualify or otherwise approve the Company’s written requests for distributions pursuant to Sections
1(i), 1(j) and 1(k) hereof.


 


4.
Trust Account Waiver. The Trustee has no right of set-off or any right, title, interest or claim of any kind (“Claim”)
to, or to any monies in, the Trust Account, and hereby irrevocably waives any Claim to, or to any monies in, the Trust Account
that it may have now or in the future. In the event the Trustee has any Claim against the Company under this Agreement, including,
without limitation, under Section 2(b) or Section 2(c) hereof, the Trustee shall pursue such
Claim solely against the Company and its assets outside the Trust Account and not against the Property or any monies in the Trust
Account.


 


5.
Termination. This Agreement shall terminate as follows:


 


(a)
If the Trustee gives written notice to the Company that it desires to resign under this Agreement, the Company shall use its reasonable
efforts to locate a successor trustee, pending which the Trustee shall continue to act in accordance with this Agreement. At such
time that the Company notifies the Trustee that a successor trustee has been appointed and has agreed to become subject to the
terms of this Agreement, the Trustee shall transfer the management of the Trust Account to the successor trustee, including but
not limited to the transfer of copies of the reports and statements relating to the Trust Account, whereupon this Agreement shall
terminate; provided, however, that in the event that the Company does not locate a successor trustee within ninety
(90) days of receipt of the resignation notice from the Trustee, the Trustee may submit an application to have the Property deposited
with any court in the State of New York or with the United States District Court for the Southern District of New York and upon
such deposit, the Trustee shall be immune from any liability whatsoever; or


 


(b)
At such time that the Trustee has completed the liquidation of the Trust Account and its obligations in accordance with the provisions
of Section 1(i) hereof (which section may not be amended under any circumstances) and distributed the Property
in accordance with the provisions of the Termination Letter, this Agreement shall terminate except with respect to Section 2(b).


 


6.
Miscellaneous.


 


(a)
The Company and the Trustee each acknowledge that the Trustee will follow the security procedures set forth below with respect
to funds transferred from the Trust Account. The Company and the Trustee will each restrict access to confidential information
relating to such security procedures to authorized persons. Each party must notify the other party immediately if it has reason
to believe unauthorized persons may have obtained access to such confidential information, or of any change in its authorized
personnel. In executing funds transfers, the Trustee shall rely upon all information supplied to it by the Company, including,
account names, account numbers, and all other identifying information relating to a Beneficiary, Beneficiary’s bank or intermediary
bank. Except for any liability arising out of the Trustee’s gross negligence, fraud or willful misconduct, the Trustee shall
not be liable for any loss, liability or expense resulting from any error in the information or transmission of the funds.


 


(b)
This Agreement shall be governed by and construed and enforced in accordance with the laws of the State of New York, without giving
effect to conflicts of law principles that would result in the application of the substantive laws of another jurisdiction. This
Agreement may be executed in several original or facsimile counterparts, each one of which shall constitute an original, and together
shall constitute but one instrument.


 


(c)
This Agreement contains the entire agreement and understanding of the parties hereto with respect to the subject matter hereof.
This Agreement or any provision hereof may only be changed, amended or modified (other than to correct a typographical error)
by a writing signed by each of the parties hereto.


 






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(d)
This Agreement or any provision hereof may only be changed, amended or modified pursuant to Section 6(c) hereof
with the Consent of the Stockholders, it being the specific intention of the parties hereto that each of the Company’s stockholders
is, and shall be, a third party beneficiary of this Section 6(d) with the same right and power to enforce this
Section 6(d) as the other parties hereto. For purposes of this Section 6(d), the “Consent
of the Stockholders” means receipt by the Trustee of a certificate from the inspector of elections of the stockholder
meeting certifying that either (i) the Company’s stockholders of record as of a record date established in accordance
with Section 213(a) of the Delaware General Corporation Law, as amended (“DGCL”) (or any successor
rule), who hold sixty-five percent (65%) or more of all then outstanding shares of the Common Stock and Class B common stock,
par value $0.0001 per share, of the Company voting together as a single class, have voted in favor of such change, amendment or
modification, or (ii) the Company’s stockholders of record as of the record date who hold sixty-five percent (65%)
or more of all then outstanding shares of the Common Stock and Class B common stock, par value $0.0001 per share, of the
Company voting together as a single class, have delivered to such entity a signed writing approving such change, amendment or
modification. No such amendment will affect any Public Stockholder who has otherwise indicated his election to redeem his share
of Common Stock in connection with a stockholder vote sought to amend this Agreement. Except for any liability arising out of
the Trustee’s gross negligence, fraud or willful misconduct, the Trustee may rely conclusively on the certification from
the inspector or elections referenced above and shall be relieved of all liability to any party for executing the proposed amendment
in reliance thereon.


 


(e)
The parties hereto consent to the jurisdiction and venue of any state or federal court located in the City of New York, State
of New York, for purposes of resolving any disputes hereunder. AS TO ANY CLAIM, CROSS-CLAIM OR COUNTERCLAIM IN ANY WAY RELATING
TO THIS AGREEMENT, EACH PARTY WAIVES THE RIGHT TO TRIAL BY JURY.


 


(f)
Any notice, consent or request to be given in connection with any of the terms or provisions of this Agreement shall be in writing
and shall be sent by express mail or similar private courier service, by certified mail (return receipt requested), by hand delivery
or by facsimile or email transmission:


 


if
to the Trustee, to:


 


American
Stock Transfer & Trust Company, LLC


6201
15th Avenue


Brooklyn,
NY 11219


Attn:
Relationship Management


Fax
No.: [            ]


 


if
to the Company, to:


 


Adam
H. Clammer


Co-Chief
Executive Officer


Nebula
Acquisition Corporation


480
Pacific Avenue, Suite 200


San
Francisco, CA 94133


Fax
No.:


 


in
each case, with copies to:


 


Ellenoff
Grossman & Schole LLP

1345 Avenue of the Americas,

New York, NY10105


Attn.:
Stuart Neuhauser, Esq.

Fax No.: (212) 370-1300


 


and


 


Deutsche
Bank Securities Inc.

60 Wall Street, 42nd Floor

New York, NY 10005

Attn.: Ravi Raghunathan

Fax No.: (646) 666-3375


 






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and


 


Goldman,
Sachs & Co.

200 West Street

New York, NY 10282

Attn.: Bennett Schachter

Email: bennett.schachter@gs.com


 


and


Freshfields
Bruckhaus Deringer US LLP

601 Lexington Avenue

31st Floor

New York, NY 10022


Attn.:
Paul D. Tropp, Esq.


Fax
No.: (212) 277 4076


 


(g)
Each of the Company and the Trustee hereby represents that it has the full right and power and has been duly authorized to enter
into this Agreement and to perform its respective obligations as contemplated hereunder. The Trustee acknowledges and agrees that
it shall not make any claims or proceed against the Trust Account, including by way of set-off, and shall not be entitled to any
funds in the Trust Account under any circumstance.


 


(h)
This Agreement is the joint product of the Trustee and the Company and each provision hereof has been subject to the mutual
consultation, negotiation and agreement of such parties and shall not be construed for or against any party
hereto.


 


(i)
This Agreement may be executed in any number of counterparts, each of which shall be deemed to be an original, but all such
counterparts shall together constitute one and the same instrument. Delivery of a signed counterpart of this Agreement by
facsimile or electronic transmission shall constitute valid and sufficient delivery thereof.


 


(j)
Each of the Company and the Trustee hereby acknowledges and agrees that each Representative, on behalf of the Underwriters, is
a third party beneficiary of this Agreement.


 


(k)  Except as specified herein, no party to this Agreement may assign its rights or delegate its obligations hereunder to any other
person or entity.


 


[Signature
Page Follows]


 






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IN
WITNESS WHEREOF, the parties have duly executed this Investment Management Trust Agreement as of the date first written above.


 


	 	American Stock Transfer &
    Trust Company, LLC, as Trustee
	 	 
	 	By: 	 
	 	 	Name: 
	 	 	Title: [_________]
	 	 
	 	Nebula Acquisition Corporation
	 	 
	 	By:	 
	 	 	Name: Rufina Adams
	 	 	Title: Chief Financial Officer


 






     


     


    







 


SCHEDULE
A


 


	Fee Item	 	Time and method of payment	 	Amount 	 
	Initial set-up fee.	 	Initial closing of Offering by wire transfer.	 	$	2,000	 
	 	 	 	 	 	 	 
	Trustee administration fee	 	Payable annually. First year fee payable at initial closing of Offering by wire transfer thereafter by wire transfer or check.	 	$	4,500	 
	 	 	 	 	 	 	 
	Transaction processing fee for disbursements to Company under Sections 1(i), 1(j) and 1(k)	 	Deduction by Trustee from accumulated income following disbursement made to Company under Section 1	 	$	300 per item presented  	 
	 	 	 	 	 	 	 
	Paying Agent services as required pursuant to Section 1(i)	 	Billed to Company upon delivery of service pursuant to Section 1(i)	 	 	Prevailing rates	 





 






    	 	Sch-1	 



     


    







 


EXHIBIT A


 


[Letterhead
of Company]


 


[Insert
date]


 


American
Stock Transfer & Trust Company, LLC


6201
15th Avenue


Brooklyn,
NY 11219


Attn:
[_________]


 


Re: Trust Account No.             Termination Letter


 


Gentlemen:


 


Pursuant
to Section 1(i) of the Investment Management Trust Agreement between Nebula Acquisition Corporation (the “Company”)
and American Stock Transfer & Trust Company, LLC (the “Trustee”), dated as of           ,
2017 (the “Trust Agreement”), this is to advise you that the Company has entered into an agreement with (the “Target Business”) to consummate a business combination with Target Business (the “Business
Combination”) on or about [insert date]. The Company shall notify you at least forty-eight (48) hours in advance
of the actual date of the consummation of the Business Combination (the “Consummation Date”). Capitalized terms used but not defined herein shall have the meanings set forth in the Trust Agreement.


 


In
accordance with the terms of the Trust Agreement, we hereby authorize you to commence to liquidate all of the assets of the Trust
Account on [insert date], and to transfer the proceeds into a segregated account held by you on behalf of the Beneficiaries to
the effect that, on the Consummation Date, all of the funds held in the Trust Account will be immediately available for transfer
to the account or accounts that the Company shall direct on the Consummation Date. It is acknowledged and agreed that while
the funds are on deposit in the trust checking account at J.P. Morgan Chase Bank, N.A. awaiting distribution, the Company will
not earn any interest or dividends.


 


On
the Consummation Date (i) counsel for the Company shall deliver to you written notification that the Business Combination
has been consummated, or will be consummated concurrently with your transfer of funds to the accounts as directed by the Company
(the “Notification”) and (ii) the Company shall deliver to you (a) [an affidavit] [a certificate]
of the Chief Executive Officer of the Company, which verifies that the Business Combination has been approved by a vote of the
Company’s stockholders, if a vote is held and (b) a written instruction signed by the Company with respect to the transfer
of the funds held in the Trust Account, including payment of the Deferred Discount from the Trust Account (the “Instruction
Letter”). You are hereby directed and authorized to transfer the funds held in the Trust Account immediately
upon your receipt of the Notification and the Instruction Letter, in accordance with the terms of the Instruction Letter. In the event that certain deposits held in the Trust Account may not be liquidated by the Consummation Date without penalty, you
will notify the Company in writing of the same and the Company shall direct you as to whether such funds should remain in the
Trust Account and be distributed after the Consummation Date to the Company. Upon the distribution of all the funds, net
of any payments necessary for reasonable unreimbursed expenses related to liquidating the Trust Account, your obligations under
the Trust Agreement shall be terminated.


 






    	 	Ex A-1	 



     


    







 


In
the event that the Business Combination is not consummated on the Consummation Date described in the notice thereof and we have
not notified you on or before the original Consummation Date of a new Consummation Date, then upon receipt by the Trustee of written
instructions from the Company, the funds held in the Trust Account shall be reinvested as provided in Section 1(c) of
the Trust Agreement on the business day immediately following the Consummation Date as set forth in such written instruction as
soon thereafter as possible.


 


	 	Very truly yours,
	 	 
	 	Nebula Acquisition Corporation
	 	 
	 	By:	 
	 	 	Name:
	 	 	Title:


 


	cc:	Deutsche Bank Securities Inc.	 
	 	Goldman,
Sachs & Co.	 




 






    	 	Ex A-2	 



     


    







 


EXHIBIT B


 


[Letterhead
of Company]


 


[Insert
date]


 


American
Stock Transfer & Trust Company, LLC


6201
15th Avenue


Brooklyn,
NY 11219


Attn:
[                   ]


 


Re:          Trust Account No.              Termination Letter


 


Gentlemen:


 


Pursuant
to Section 1(i) of the Investment Management Trust Agreement between Nebula Acquisition Corporation (the “Company”)
and American Stock Transfer & Trust Company, LLC (the “Trustee”), dated as of            ,
2017 (the “Trust Agreement”), this is to advise you that the Company has been unable to effect a business
combination with a Target Business within the time frame specified in the Company’s Amended and Restated Certificate of
Incorporation, as described in the Company’s Prospectus relating to the Offering. Capitalized terms used but not defined
herein shall have the meanings set forth in the Trust Agreement.


 


In
accordance with the terms of the Trust Agreement, we hereby authorize you to liquidate all of the assets in the Trust Account
on          , 20 and to transfer the total proceeds into
a segregated account held by you on behalf of the Beneficiaries to await distribution to the Public Stockholders. The Company
has selected [         ](1) as the record date for the purpose of determining
the Public Stockholders entitled to receive their share of the liquidation proceeds. You agree to be the Paying Agent of
record and, in your separate capacity as Paying Agent, agree to distribute said funds directly to the Company’s Public Stockholders
in accordance with the terms of the Trust Agreement and the Amended and Restated Certificate of Incorporation of the Company. Upon the distribution of all the funds, net of any payments necessary for reasonable unreimbursed expenses related to liquidating
the Trust Account, your obligations under the Trust Agreement shall be terminated, except to the extent otherwise provided in
Section 1(i) of the Trust Agreement.


 


(1) 24 months from the closing of the Offering (or 27 months from the closing of the Offering if the Company has executed a letter
of intent, agreement in principle or definitive agreement for an initial business combination within 24 months from the closing
of the Offering).


 


	 	Very truly yours,
	 	 
	 	Nebula Acquisition Corporation
	 	 
	 	By:	 
	 	 	Name:
	 	 	Title:


 


	cc:	Deutsche Bank Securities Inc.	 
	 	Goldman,
Sachs & Co.	 




 






    	 	Ex B-1	 



     


    







 


EXHIBIT C


 


[Letterhead
of Company]


 


[Insert
date]


 


American
Stock Transfer & Trust Company, LLC


6201
15th Avenue


Brooklyn,
NY 11219


Attn: [_________]


 


Re: Trust Account No.               Tax Payment and Working Capital Withdrawal Instruction


 


Gentlemen:


 


Pursuant
to Section 1(j) of the Investment Management Trust Agreement between Nebula Acquisition Corporation (the “Company”)
and American Stock Transfer & Trust Company, LLC (the “Trustee”), dated as of        , 2017 (the “Trust Agreement”), the Company hereby requests that you deliver to the Company $ of the interest income earned on the Property as of the date hereof. Capitalized terms used but not defined herein shall
have the meanings set forth in the Trust Agreement.


 


The
Company needs such funds [to pay for the tax obligations as set forth on the attached tax return or tax statement] [for working
capital purposes (1)]. In accordance with the terms of the Trust Agreement, you are hereby directed and authorized to transfer
(via wire transfer) such funds promptly upon your receipt of this letter to the Company’s operating account at:


 


[WIRE
INSTRUCTION INFORMATION]


 


	 	Very truly yours,
	 	 
	 	Nebula Acquisition Corporation
	 	 
	 	By:	 
	 	 	Name:
	 	 	Title:


 


	cc:	Deutsche Bank Securities Inc.	 
	 	Goldman,
Sachs & Co.	 




 


		(1)	Not
                                         to exceed $750,000.



 






    	 	Ex C-1	 



     


    







 


EXHIBIT D


 


[Letterhead
of Company]


 


[Insert
date]


 


American
Stock Transfer & Trust Company, LLC


6201
15th Avenue


Brooklyn,
NY 11219


Attn:
[                   ]


 


Re:          Trust Account No.              Stockholder Redemption Withdrawal Instruction


 


Gentlemen:


 


Pursuant
to Section 1(k) of the Investment Management Trust Agreement between Nebula Acquisition Corporation (the
“Company”) and American Stock Transfer & Trust Company, LLC (the “Trustee”),
dated as of              , 2017 (the “Trust
Agreement”), the Company hereby requests that you deliver to the redeeming Public Stockholders of the Company $                   of the principal and interest income earned on the Property as of the date hereof into a segregated account held by you on behalf
of the Beneficiaries. Capitalized terms used but not defined herein shall have the meanings set forth in the Trust Agreement.


 


The
Company needs such funds to pay its Public Stockholders who have properly elected to have their shares of Common Stock redeemed
by the Company 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 its public shares
of Common Stock if the Company has not consummated an initial Business Combination within such time as is described in the Company’s
amended and restated certificate of incorporation. As such, you are hereby directed and authorized to transfer (via wire transfer)
such funds promptly upon your receipt of this letter into a segregated account held by you on behalf of the Beneficiaries.


 


	 	Very truly yours,
	 	 
	 	Nebula Acquisition Corporation
	 	 
	 	By:	 
	 	 	Name:
	 	 	Title:


 


	cc:	Deutsche Bank Securities Inc.	 
	 	Goldman,
Sachs & Co.	 




 


 


 


Ex D-1