Document:

Exhibit 10.4

 

September
3, 2020

 

Tailwind Acquisition Corp.

1545 Courtney Ave

Los Angeles, California 90046

 

Re:            Initial Public Offering

 

Ladies and Gentlemen:

 

This letter (this “Letter Agreement”)
is being delivered to you in accordance with the Underwriting Agreement (the “Underwriting Agreement”)
entered into by and between Tailwind Acquisition Corp., a Delaware corporation (the “Company”) and Jefferies
LLC, as representative (the “Representative”) of the several underwriters (the “Underwriters”),
relating to an underwritten initial public offering (the “Public Offering”) of 34,500,000 of the Company’s
units (including 4,500,000 units that may be purchased pursuant to the Underwriters’ option to purchase additional units,
the “Units”), each comprising of one share of the Company’s Class A common stock, par value $0.0001
per share (the “Common Stock”), and one-half of one redeemable warrant (each whole warrant, a “Warrant”).
Each Warrant entitles the holder thereof to purchase one share of Common Stock at a price of $11.50 per share, subject to adjustment.
The Units will be sold in the Public Offering pursuant to a registration statement on Form S-1 and a prospectus (the “Prospectus”)
filed by the Company with the U.S. Securities and Exchange Commission (the “Commission”). Certain capitalized
terms used herein are defined in paragraph 1 hereof.

 

In order to induce the Company and the Underwriters
to enter into the Underwriting Agreement and to proceed with the Public Offering and for other good and valuable consideration,
the receipt and sufficiency of which are hereby acknowledged, Tailwind Sponsor LLC (the “Sponsor”) and
each of the undersigned (each, an “Insider” and, collectively, the “Insiders”)
hereby agree with the Company as follows:

 

1.                  
Definitions. As used herein, (i) “Business Combination” shall mean a merger, capital
stock exchange, asset acquisition, stock purchase, reorganization or similar business combination, involving the Company and one
or more businesses; (ii) “Founder Shares” shall mean the 8,625,500 shares of Class B Common Stock of
the Company, par value $0.0001 per share, outstanding prior to the consummation of the Public Offering; (iii) “Private
Placement Warrants” shall mean the warrants to purchase shares of Common Stock of the Company that will be acquired
by the Sponsor for an aggregate purchase price of $9,700,000 or $1.00 per Warrant, in a private placement that shall close simultaneously
with the consummation of the Public Offering (including Common Stock issuable upon conversion thereof); (iv) “Public
Stockholders” shall mean the holders of Common Stock included in the Units issued in the Public Offering; (v) “Public
Shares” shall mean the Common Stock included in the Units issued in the Public Offering; (vi) “Trust
Account” shall mean the trust account into which a portion of the net proceeds of the Public Offering and the sale
of the Private Placement Warrants shall be deposited; (vii) “Transfer” shall mean the (a) sale of, offer
to sell, contract or agreement to sell, hypothecate, pledge, grant of any option to purchase or otherwise dispose of or agreement
to dispose of, directly or indirectly, or establishment or increase of a put equivalent position or liquidation with respect to
or decrease of a call equivalent position within the meaning of Section 16 of the Securities Exchange Act of 1934, as amended,
and the rules and regulations of the Commission promulgated thereunder with respect to, any security, (b) entry into any swap or
other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of any security,
whether any such transaction is to be settled by delivery of such securities, in cash or otherwise, or (c) public announcement
of any intention to effect any transaction specified in clause (a) or (b); and (viii) “Charter” shall
mean the Company’s Amended and Restated Certificate of Incorporation, as the same may be amended from time to time.

 

2.                  
Representations and Warranties.

 

(a)                 The
Sponsor and each Insider, with respect to itself, herself or himself, represent and warrant to the Company that it, she or he
has the full right and power, without violating any agreement to which it, she or he is bound (including, without limitation,
any non-competition or non-solicitation agreement with any employer or former employer), to enter into this Letter Agreement,
as applicable, and to serve as an officer of the Company and/or a director on the Company’s Board of Director (the
 “Board”), as applicable, and each Insider hereby consents to being named in the Prospectus, road
show and any other materials as an officer and/or director of the Company, as applicable.

 

     

     

    

 

(b)               
Each Insider represents and warrants, with respect to herself or himself, that such Insider’s biographical
information furnished to the Company (including any such information included in the Prospectus) is true and accurate in all material
respects and does not omit any material information with respect to such Insider’s background. The Insider’s questionnaire
furnished to the Company is true and accurate in all material respects. Each Insider represents and warrants that such Insider
is not subject to or a respondent in any legal action for, any injunction, cease-and-desist order or order or stipulation to desist
or refrain from any act or practice relating to the offering of securities in any jurisdiction; such Insider has never been convicted
of, or pleaded guilty to, any crime (i) involving fraud, (ii) relating to any financial transaction or handling of funds of another
person, or (iii) pertaining to any dealings in any securities and such Insider is not currently a defendant in any such criminal
proceeding; and such Insider has never been suspended or expelled from membership in any securities or commodities exchange or
association or had a securities or commodities license or registration denied, suspended or revoked.

 

3.                  
Business Combination Vote. It is acknowledged and agreed that the Company shall not enter into a definitive
agreement regarding a proposed Business Combination without the prior consent of the Sponsor.  The Sponsor and each Insider,
with respect to itself or herself or himself, agrees that if the Company seeks stockholder approval of a proposed initial Business
Combination, then in connection with such proposed initial Business Combination, it, she or he, as applicable, shall vote all Founder
Shares and any Public Shares held by it, her or him, as applicable, in favor of such proposed initial Business Combination (including
any proposals recommended by the Board in connection with such Business Combination) and not redeem any Public Shares held by it,
her or him, as applicable, in connection with such stockholder approval.

 

4.                  
Failure to Consummate a Business Combination; Trust Account Waiver.

 

(a)                
The Sponsor and each Insider hereby agree, with respect to itself, herself or himself, that in the event that the
Company fails to consummate its initial Business Combination within the time period set forth in the Charter, the Sponsor and each
Insider shall take all reasonable steps to cause the Company to (i) cease all operations except for the purpose of winding up;
(ii) as promptly as reasonably possible but not more than 10 business days thereafter, redeem 100% of the Public Shares, at a per-share
price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including interest earned on the funds
held in the Trust Account and not previously release to the Company to pay income taxes (less up to $100,000 of interest to pay
dissolution expenses), divided by the number of then outstanding Public Shares, which redemption will completely extinguish Public
Stockholders’ rights as stockholders (including the right to receive further liquidation distributions, if any); and (iii)
as promptly as reasonably possible following such redemption, subject to the approval of the Company’s remaining stockholders
and the Board, liquidate and dissolve, subject in the case of clauses (ii) and (iii) to the Company’s obligations under Delaware
law to provide for claims of creditors and in all cases subject to the other requirements of applicable law. The Sponsor and each
Insider agree not to propose any amendment to the Charter (i) that would modify the substance or timing of the Company’s
obligation to provide holders of the Public Shares the right to have their shares redeemed in connection with an initial Business
Combination or to redeem 100% of the Public Shares if the Company does not complete an initial Business Combination within the
required time period set forth in the Charter or (ii) with respect to any provision relating to the rights of holders of Public
Shares unless the Company provides its Public Stockholders with the opportunity to redeem their Public Shares upon approval of
any such amendment at a per-share price, payable in cash, equal to the aggregate amount then on deposit in the Trust Account, including
interest earned on the funds held in the Trust Account and not previously released to the Company to pay taxes, if any, divided
by the number of then-outstanding Public Shares.

 

(b)                The
Sponsor and each Insider, with respect to itself, herself or himself, acknowledges that it, she or he has no right, title,
interest or claim of any kind in or to any monies held in the Trust Account of the Company as a result of any liquidation of
the Company with respect to the Founder Shares held by it, her or him, if any. The Sponsor and each of the Insiders hereby
further waive, with respect to any Founder Shares and Public Shares held by it, her or him, as applicable, any redemption
rights it, she or he may have in connection with the consummation of a Business Combination, including, without limitation,
any such rights available in the context of a stockholder vote to approve such Business Combination or a stockholder vote to
approve an amendment to the Charter (i) that would modify the substance or timing of the Company’s obligation to
provide holders of the Public Shares the right to have their shares redeemed in connection with an initial Business
Combination or to redeem 100% of the Public Shares if the Company has not consummated an initial Business Combination within
the time period set forth in the Charter or (ii) with respect to any provision relating to the rights of holders of Public
Shares (although the Sponsor and the Insiders shall be entitled to liquidation rights with respect to any Public Shares they
hold if the Company fails to consummate a Business Combination within the required time period set forth in the Charter).

 

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5.                  
Lock-up; Transfer Restrictions.

 

(a)                
The Sponsor and the Insiders agree that they shall not Transfer any Founder Shares (the “Founder Shares
Lock-up”) until the earliest of (A) one year after the completion of an initial Business Combination and (B) the
date following the completion of an initial Business Combination on which the Company completes a liquidation, merger, capital
stock exchange, reorganization or other similar transaction that results in all of the Company’s stockholders having the
right to exchange their Common Stock for cash, securities or other property (the “Founder Shares Lock-up Period”).
Notwithstanding the foregoing, if, subsequent to a Business Combination, the closing price of the Common Stock equals or exceeds
$12.00 per share (as adjusted for stock splits, stock dividends, reorganizations, recapitalizations and the like) for any 20 trading
days within a 30-trading day period commencing at least 150 days after the Company’s initial Business Combination, the Founder
Shares shall be released from the Founder Shares Lock-up.

 

(b)               
The Sponsor and Insiders agree that they shall not effectuate any Transfer of Private Placement Warrants or Common
Stock underlying such warrants until 30 days after the completion of an initial Business Combination.

 

(c)                
Notwithstanding the provisions set forth in paragraphs 5(a) and (b), Transfers of the Founder Shares,
Private Placement Warrants and Common Stock underlying the Private Placement Warrants are permitted (a) to the Company’s
officers or directors, any affiliates or family members of any of the Company’s officers or directors, any members or partners
of the Sponsor or their affiliates, any affiliates of the Sponsor, or any employees of such affiliates; (b) in the case of an individual,
by gift to a member of one of the individual’s immediate family or to a trust, the beneficiary of which is a member of the
individual’s immediate family, an affiliate of such person or to a charitable organization; (c) in the case of an individual,
by virtue of laws of descent and distribution upon death of the individual; (d) in the case of an individual, pursuant to a qualified
domestic relations order; (e) by private sales or transfers made in connection with the consummation of a Business Combination
at prices no greater than the price at which the Founder Shares, Private Placement Warrants or Class A Common Stock, as applicable,
were originally purchased; (f) by virtue of the laws of Delaware or the Sponsor’s organizational documents upon liquidation
or dissolution of the Sponsor; (g) to the Company for no value for cancellation in connection with the consummation of an
initial Business Combination; (h) in the event of the Company’s liquidation prior to the completion of an initial Business
Combination; or (i) in the event of the Company’s completion of a liquidation, merger, share exchange or other similar transaction
which results in all of the Company’s Public Stockholders having the right to exchange their Common Stock for cash, securities
or other property subsequent to the completion of an initial Business Combination; provided, however, that in the
case of clauses (a) through (f) these permitted transferees must enter into a written agreement agreeing to be bound by these transfer
restrictions.

 

(d)               
During the period commencing on the effective date of the Underwriting Agreement and ending 180 days after such date,
the Sponsor and each Insider shall not, without the prior written consent of the Representative, Transfer any Units, Common Stock,
Warrants or any other securities convertible into, or exercisable or exchangeable for, Common Stock held by it, her or him, as
applicable, subject to certain exceptions enumerated in Section 6(h) of the Underwriting Agreement.

 

6.                  
Remedies. The Sponsor and each of the Insiders hereby agree and acknowledge that (i) each of the Underwriters
and the Company would be irreparably injured in the event of a breach by the Sponsor or such Insider of its, her or his obligations,
as applicable under paragraphs 3, 4, 5, 7, 10 and 11, (ii) monetary damages may not be
an adequate remedy for such breach and (iii) the non-breaching party shall be entitled to injunctive relief, in addition to any
other remedy that such party may have in law or in equity, in the event of such breach.

 

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7.                  
 Payments by the Company. Except as disclosed in the Prospectus, neither the Sponsor nor any affiliate of
the Sponsor nor any director or officer of the Company nor any affiliate of the officers shall receive from the Company any finder’s
fee, reimbursement, consulting fee, monies in respect of any payment of a loan or other compensation prior to, or in connection
with any services rendered in order to effectuate the consummation of the Company’s initial Business Combination (regardless
of the type of transaction that it is).

 

8.                  
Director and Officer Liability Insurance. The Company will maintain an insurance policy or policies providing
directors’ and officers’ liability insurance, and the Insiders shall be covered by such policy or policies, in accordance
with its or their terms, to the maximum extent of the coverage available for any of the Company’s directors or officers.

 

9.                  
Termination. This Letter Agreement shall terminate on the earlier of (i) the expiration of the Founder Shares
Lock-up Period and (ii) the liquidation of the Company.

 

10.               
Indemnification. In the event of the liquidation of the Trust Account upon the failure of the Company to consummate
its initial Business Combination within the time period set forth in the Charter, the Sponsor (the “Indemnitor”)
agrees to indemnify and hold harmless the Company against any and all loss, liability, claim, damage and expense whatsoever (including,
but not limited to, any and all legal or other expenses reasonably incurred in investigating, preparing or defending against any
litigation, whether pending or threatened) to which the Company may become subject as a result of any claim by (i) any third party
for services rendered or products sold to the Company (except for the Company’s independent auditors) or (ii) any prospective
target business with which the Company has discussed entering into a transaction agreement (a “Target”);
provided, however, that such indemnification of the Company by the Indemnitor (x) shall apply only to the extent
necessary to ensure that such claims by a third party for services rendered or products sold to the Company or a Target do not
reduce the amount of funds in the Trust Account to below the lesser of (i) $10.00 per Public Share and (ii) the actual amount per
Public Share held in the Trust Account as of the date of the liquidation of the Trust Account if less than $10.00 per Public Share
due to reductions in the value of the trust assets, in each case net of interest that may be withdrawn to pay the Company’s
tax obligations, (y) shall not apply to any claims by a third party or Target who executed a waiver of any and all rights to the
monies held in the Trust Account (whether or not such waiver is enforceable) and (z) shall not apply to any claims under the Company’s
indemnity of the Underwriters against certain liabilities, including liabilities under the Securities Act of 1933, as amended.
The Indemnitor shall have the right to defend against any such claim with counsel of its choice reasonably satisfactory to the
Company if, within 15 days following written receipt of notice of the claim to the Indemnitor, the Indemnitor notifies the Company
in writing that it shall undertake such defense.

 

11.               
Forfeiture of Founder Shares. To the extent that the Underwriters do not exercise their option to purchase
additional Units within 45 days from the date of the Prospectus in full (as further described in the Prospectus), the Sponsor agrees
to automatically surrender to the Company for no consideration, for cancellation at no cost, an aggregate number of Founder Shares
so that the number of Founder Shares will equal of 20% of the sum of the total number of Common Stock and Founder Shares outstanding
at such time. The Sponsor and Insiders further agree that to the extent that the size of the Public Offering is increased or decreased,
the Company will effect a stock split, stock dividend, reverse stock split or stock repurchase, as applicable, with respect to
the Founder Shares immediately prior to the consummation of the Public Offering in such amount as to maintain the number of Founder
Shares at 20% of the sum of the total number of Common Stock and Founder Shares outstanding at such time.

 

12.               
Entire Agreement. This Letter Agreement constitutes the entire agreement and understanding of the parties
hereto in respect of the subject matter hereof and supersedes all prior understandings, agreements, or representations by or among
the parties hereto, written or oral, to the extent they relate in any way to the subject matter hereof or the transactions contemplated
hereby. This Letter Agreement may not be changed, amended, modified or waived (other than to correct a typographical error) as
to any particular provision, except by a written instrument executed by all parties hereto.

 

13.                Assignment.
No party hereto may assign either this Letter Agreement or any of its rights, interests, or obligations hereunder without the
prior written consent of the other parties. Any purported assignment in violation of this paragraph shall be void and
ineffectual and shall not operate to transfer or assign any interest or title to the purported assignee. This Letter
Agreement shall be binding on the Sponsor, each of the Insiders and each of their respective successors, heirs, personal
representatives and assigns and permitted transferees.

 

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14.               
Counterparts. This Letter Agreement may be executed in any number of original or facsimile counterparts, and
each of such counterparts shall for all purposes be deemed to be an original, and all such counterparts shall together constitute
but one and the same instrument.

 

15.               
Effect of Headings. The paragraph headings herein are for convenience only and are not part of this Letter
Agreement and shall not affect the interpretation thereof.

 

16.               
Severability. This Letter Agreement shall be deemed severable, and the invalidity or unenforceability of any
term or provision hereof shall not affect the validity or enforceability of this Letter Agreement or of any other term or provision
hereof. Furthermore, in lieu of any such invalid or unenforceable term or provision, the parties hereto intend that there shall
be added as a part of this Letter Agreement a provision as similar in terms to such invalid or unenforceable provision as may be
possible and be valid and enforceable.

 

17.               
Governing Law. This Letter 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. The parties hereto (i) all agree that any action, proceeding, claim or dispute arising
out of, or relating in any way to, this Letter Agreement shall be brought and enforced in the courts of New York City, in the State
of New York, and irrevocably submit to such jurisdiction and venue, which jurisdiction and venue shall be exclusive, and (ii) waive
any objection to such exclusive jurisdiction and venue or that such courts represent an inconvenient forum.

 

18.               
Notices. Any notice, consent or request to be given in connection with any of the terms or provisions of this
Letter 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 facsimile transmission.

 

[Signature
Page Follows]

 

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	 	Sincerely,
	 	 
	 	TAILWIND SPONSOR LLC
	 	 
	 	By:	 /s/ Philip Krim
	 	Name: Philip Krim
	 	Title: Manager

 

[Signature Page to Letter Agreement] 

     

     

    

 

	 	/s/ Philip Krim
	 	Philip Krim

  

[Signature Page to Letter Agreement]

 

     

     

    

	 	 
	 	/s/ Chris Hollod
	 	Chris Hollod

  

[Signature Page to Letter Agreement]

 

     

     

    

	 	 
	 	/s/ Matt Eby
	 	Matt Eby

  

[Signature Page to Letter Agreement]

 

     

     

    

 

	 	 
	 	/s/ Alan Sheriff
	 	Alan Sheriff

 

[Signature Page to Letter Agreement]

 

     

     

    

	 	 
	 	/s/ Wisdom Lu
	 	Wisdom Lu

  

[Signature Page to Letter Agreement]

 

     

     

    

 

	 	/s/ Neha Parikh
	 	Neha Parikh

 

[Signature Page to Letter Agreement]

 

     

     

    

 

	 	/s/ Will Quist
	 	Will Quist

 

[Signature Page to Letter Agreement]

 

     

     

    

 

Acknowledged and Agreed:

 

TAILWIND ACQUISITION CORP.

  

	By:	 /s/ Chris Hollod	 
	 	Name:	 Chris Hollod	 
	 	Title:	Chief Executive Officer	 

 

[Signature Page to Letter Agreement]Exhibit 10.5

 

TAILWIND ACQUISITION CORP.

1545 Courtney Ave

Los Angeles, California 90046

 

September 9, 2020

 

Tailwind Sponsor LLC

1545 Courtney Ave

Los Angeles, California 90046

 

Ladies and Gentlemen:

 

This letter agreement will confirm our agreement that, commencing
on the effective date (the “Effective Date”) of the registration statement (the “Registration
Statement”) for the initial public offering (the “IPO”) of the securities of Tailwind Acquisition
Corp. (the “Company”) and continuing until the earlier of (i) the consummation by the Company of an initial
business combination and (ii) the Company’s liquidation (in each case as described in the Registration Statement) (such earlier
date hereinafter referred to as the “Termination Date”):

 

	 	i.	Tailwind Sponsor LLC (the “Sponsor”) shall take steps directly
or indirectly to make available to the Company, at 1545 Courtney Ave, Los Angeles, California 90046 (or any successor location),
certain office space, utilities and secretarial and administrative support as may be required by the Company from time to time.
In exchange therefor, the Company shall pay Sponsor, or at its direction, an affiliate thereof, the sum of $10,000 per month on
the Effective Date and continuing monthly thereafter until the Termination Date; and
	 	 	 
	 	ii.	Sponsor hereby agrees that it does not have any right, title, interest or claim of any
kind (a “Claim”) in or to any monies that may be set aside in a trust account (the “Trust
Account”) that may be established upon the consummation of the IPO, and hereby irrevocably waives any Claim it may
have in the future as a result of, or arising out of, any negotiations, contracts or agreements with the Company and will not seek
recourse against the Trust Account for any reason whatsoever.

 

This letter agreement constitutes the entire agreement and
understanding of the parties hereto in respect of its subject matter and supersedes all prior understandings, agreements, or representations
by or among the parties hereto, written or oral, to the extent they relate in any way to the subject matter hereof or the transactions
contemplated hereby.

 

This letter agreement may not be amended, modified or waived
as to any particular provision, except by a written instrument executed by the parties hereto.

 

The parties may not assign this letter agreement and any of
their rights, interests, or obligations hereunder without the consent of the other party.

 

This letter agreement shall be governed by, construed in accordance
with, and interpreted pursuant to the laws of the State of New York, without giving effect to its choice of laws principles that
will apply the laws of another jurisdiction.

 

This letter agreement may be executed in one or more counterparts,
each of which shall for all purposes be deemed to be an original but all of which together shall constitute one and the same agreement.
Only one such counterpart signed by the party against whom enforceability is sought needs to be produced to evidence the existence
of this letter agreement.

 

[Signature Page Follows]

 

    

     

    

 

	 	Very truly yours,
	 	 
	 	TAILWIND ACQUISITION CORP.
	 	 	 
	 	By:	/s/ Chris Hollod  
	 	Name:	Chris Hollod 
	 	Title:	Chief Executive Officer

 

	AGREED TO AND ACCEPTED BY:
	 
	TAILWIND SPONSOR LLC
	 	 
	By:	/s/ Philip Krim  	 
	 	Name:Philip Krim	
	 	Title:Manager	

 

[Signature Page to Administrative Support Agreement]

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