Document:

EX-10.4

 Exhibit 10.4

NavSight Holdings, Inc. 
 June 16,
2020 
 Six4 Holdings, LLC 
  

	 	RE:	 Securities Subscription Agreement 

Ladies and Gentlemen: 
 This agreement (this
“Agreement”) is entered into on June 16, 2020 by and among, Six4 Holdings, LLC, a Delaware limited liability company the “Subscriber”), and NavSight Holdings, Inc., a Delaware corporation (the
“Company”). Pursuant to the terms hereof, the Company hereby accepts the offer the Subscriber has made to subscribe for and purchase 5,750,000 shares of Class B common stock, $0.0001 par value per share, of the Company (the
“Shares”), up to 750,000 of which are subject to complete or partial forfeiture by Subscriber if the underwriters of the initial public offering (“IPO”) of units (“Units”) of the Company do not
fully exercise their over-allotment option (the “Over-allotment Option”). The terms on which the Company is willing to sell the Shares to the Subscriber, and the Company and the Subscriber’s agreements regarding such Shares,
are as follows: 
  

	1.	 Subscription and Purchase of Shares. Subscriber has delivered to the Company the sum of $25,000 (the
“Purchase Price”), which the Company acknowledges receiving in cash, the Company hereby sells and issues the Shares to the Subscriber, and the Subscriber hereby subscribes for and purchases the Shares from the Company, 750,000 of
which are subject to forfeiture by the Subscriber, on the terms and subject to the conditions set forth in this Agreement. Concurrently with the Subscriber’s execution of this Agreement, the Company shall, at its option, deliver to the
Subscriber a certificate registered in the Subscriber’s name representing the Shares (the “Original Certificate”), or effect such delivery in book-entry form. 

	2.	 Representations, Warranties and Agreements. 

 

	 	2.1.	 Subscriber’s Representations, Warranties and Agreements. To induce the Company to issue the Shares
to the Subscriber, Subscriber hereby represents and warrants to the Company and agrees with the Company as follows: 

  

	 	2.1.1.	 No Government Recommendation or Approval. Subscriber understands that no federal or state agency has
passed upon or made any recommendation or endorsement of the offering of the Shares. 

  

	 	2.1.2.	 No Conflicts. The execution, delivery and performance of this Agreement and the consummation by the
Subscriber of the transactions contemplated hereby do not violate, conflict with or constitute a default under (i) the formation and governing documents of Subscriber, (ii) any agreement, indenture or instrument to which the Subscriber is
a party or (iii) any law, statute, rule or regulation to which the Subscriber is subject, or any agreement, order, judgment or decree to which the Subscriber is subject. 

 

	 	2.1.3.	 Organization and Authority. Subscriber is a Delaware limited liability company, validly existing and in
good standing under the laws of Delaware and possessing all requisite power and authority necessary to carry out the transactions contemplated by this Agreement. Upon execution and delivery by Subscriber, this Agreement will be a legal, valid and
binding agreement of such Subscriber, enforceable against such Subscriber in accordance with its terms, except as such enforceability may be limited by applicable bankruptcy, insolvency, fraudulent conveyance or similar laws affecting the
enforcement of creditors’ rights generally and subject to general principles of equity (regardless of whether enforcement is sought in a proceeding at law or in equity). 

 

	 	2.1.4.	 Experience, Financial Capability and Suitability. Subscriber is: (i) sophisticated in financial
matters and is able to evaluate the risks and benefits of the investment in the Shares and (ii) able to bear the economic risk of its investment in the Shares for an indefinite period of time because the Shares have not been registered under
the Securities Act (as defined below) and therefore cannot be sold unless subsequently registered under the Securities Act or an exemption from such registration is available. Subscriber is capable of evaluating the merits and risks of its
investment in the Company and has the capacity to protect its own interests. Subscriber must bear the economic risk of this investment until the Shares are sold pursuant to: (i) an effective registration statement under the Securities Act or
(ii) an exemption from registration available with respect to such sale. Subscriber is able to bear the economic risks of an investment in the Shares and to afford a complete loss of such Subscriber’s investment in the Shares.

  

	 	2.1.5.	 Access to Information; Independent Investigation. Prior to the execution of this Agreement, Subscriber
has had the opportunity to ask questions of and receive answers from representatives of the Company concerning an investment in the Company, as well as the finances, operations, business and prospects of the Company, and the opportunity to obtain
additional information to verify the accuracy of all information so obtained. In determining whether to make this investment, Subscriber has relied solely on such Subscriber’s own knowledge and understanding of the Company and its business
based upon such Subscriber’s own due diligence investigation and the information furnished pursuant to this paragraph. Subscriber understands that no person has been authorized to give any information or to make any representations which were
not furnished pursuant to this Section 2 and Subscriber has not relied on any other representations or information in making its investment decision, whether written or oral, relating to the Company, its operations and/or its prospects.

	 	2.1.6.	 Regulation D Offering. Subscriber represents that it is an “accredited investor” as such term
is defined in Rule 501(a) of Regulation D under the Securities Act of 1933, as amended (the “Securities Act”), and acknowledges the sale contemplated hereby is being made in reliance on a private placement exemption to
“accredited investors” within the meaning of Section 501(a) of Regulation D under the Securities Act or similar exemptions under federal and state law. 

 

	 	2.1.7.	 Investment Purposes. Subscriber is subscribing for and purchasing the Shares solely for investment
purposes, for such Subscriber’s own account and not for the account or benefit of any other person, and not with a view towards the distribution or dissemination thereof. Subscriber did not decide to enter into this Agreement as a result of any
general solicitation or general advertising within the meaning of Rule 502 under the Securities Act. 

  

	 	2.1.8.	 Restrictions on Transfer; Shell Company. Subscriber understands the Shares are being offered in a
transaction not involving a public offering within the meaning of the Securities Act. Subscriber understands the Shares will be “restricted securities” within the meaning of Rule 144(a)(3) under the Securities Act, and Subscriber
understands that the certificates representing the Shares will contain a legend in respect of such restrictions. If in the future the Subscriber decides to offer, resell, pledge or otherwise transfer the Shares, such Shares may be offered, resold,
pledged or otherwise transferred only pursuant to: (i) registration under the Securities Act, or (ii) an available exemption from registration. Subscriber agrees that if any transfer of its Shares or any interest therein is proposed to be
made, as a condition precedent to any such transfer, such Subscriber may be required to deliver to the Company an opinion of counsel satisfactory to the Company. Absent registration or an exemption, Subscriber agrees not to resell the Shares.
Subscriber further acknowledges that because the Company is a shell company, Rule 144 may not be available to such Subscriber for the resale of the Shares until one year following consummation of the initial business combination of the Company,
despite technical compliance with the requirements of Rule 144 and the release or waiver of any contractual transfer restrictions. 

	 	2.1.9.	 No Governmental Consents. No governmental, administrative or other third party consents or approvals are
required, necessary or appropriate on the part of Subscriber in connection with the transactions contemplated by this Agreement. 

  

	 	2.2.	 Company’s Representations, Warranties and Agreements. To induce the Subscriber to subscribe for and
purchase the Shares, the Company hereby represents and warrants to Subscriber and agrees with Subscriber as follows: 

  

	 	2.2.1.	 Organization and Corporate Power. The Company is a Delaware corporation and is qualified to do business
in every jurisdiction in which the failure to so qualify would reasonably be expected to have a material adverse effect on the financial condition, operating results or assets of the Company. The Company possesses all requisite corporate power and
authority necessary to carry out the transactions contemplated by this Agreement. Upon execution and delivery by the Company, this Agreement will be a legal, valid and binding agreement of the Company, enforceable against the Company in
accordance with its terms, except as such enforceability may be limited by applicable bankruptcy, insolvency, fraudulent conveyance or similar laws affecting the enforcement of creditors’ rights generally and subject to general principles of
equity (regardless of whether enforcement is sought in a proceeding at law or in equity). 

  

	 	2.2.2.	 No Conflicts. The execution, delivery and performance of this Agreement and the consummation by the
Company of the transactions contemplated hereby do not violate, conflict with or constitute a default under (i) the certificate of incorporation (the “Charter”) or bylaws of the Company, (ii) any agreement, indenture or
instrument to which the Company is a party or (iii) any law, statute, rule or regulation to which the Company is subject, or any agreement, order, judgment or decree to which the Company is subject. 

 

	 	2.2.3.	 Title to Shares. Upon issuance in accordance with, and payment pursuant to, the terms hereof, and the
Charter, the Shares will be duly and validly issued, fully paid and nonassessable. Upon issuance in accordance with, and payment pursuant to, the terms hereof, and the Charter, Subscriber will have or receive good title to the Shares, free and clear
of all liens, claims and encumbrances of any kind, other than (a) transfer restrictions hereunder and under the other agreements to which the Shares may be subject, (b) transfer restrictions under federal and state securities laws, and
(c) liens, claims or encumbrances imposed due to the actions of such Subscriber. 

  

	 	2.2.4.	 No Adverse Actions. There are no actions, suits, investigations or proceedings pending, threatened
against or affecting the Company which: (i) seek to restrain, enjoin, prevent the consummation of or otherwise affect the transactions contemplated by this Agreement or (ii) question the validity or legality of any transactions or seeks to
recover damages or to obtain other relief in connection with any transactions. 

	3.	 Forfeiture of Shares. 

 

	 	3.1.	 Partial or No Exercise of the Over-allotment Option. In the event the Over-allotment Option granted to
the representative(s) of the underwriters of the Company’s IPO is not exercised in full, the Subscriber acknowledges and agrees that it (or, if applicable, it and any transferees of Shares) shall forfeit any and all rights to such number
of Shares (up to an aggregate of 750,000 Shares for the Subscriber) and pro rata based upon the percentage of the Over-allotment Option exercised) such that immediately following such forfeiture, the Subscriber (and any such transferees and all
other initial stockholders prior to the IPO, if any) will own an aggregate number of Shares (not including shares of common stock issuable upon exercise of any warrants or any shares of common stock subscribed for and purchased by the Subscriber in
the Company’s IPO or in the aftermarket) equal to 20% of the issued and outstanding shares of common stock of the Company immediately following the IPO. 

  

	 	3.2.	 Termination of Rights as Stockholder. If any of the Shares are forfeited by the Subscriber in accordance
with this Section 3, then after such time such Subscriber (or successor in interest), shall no longer have any rights as a holder of such forfeited Shares, and the Company shall take such action as is appropriate to cancel such forfeited
Shares. 

  

	 	3.3.	 Share Certificates. In the event an adjustment to the Original Certificates, if any, for the Subscriber
is required pursuant to this Section 3, then such Subscriber shall return such Original Certificates to the Company or its designated agent as soon as practicable upon its receipt of notice from the Company advising such Subscriber of such
adjustment, following which a new certificate (the “New Certificate”), if any, shall be issued in such amount representing the adjusted number of Shares held by the Subscriber. The New Certificate, if any, shall be returned to the
Subscriber as soon as practicable. Any such adjustment for any uncertificated securities held by the Subscriber shall be made in book-entry form. 

  

	4.	 Waiver of Liquidation Distributions; Redemption Rights. In connection with the Shares subscribed for and
purchased pursuant to this Agreement, Subscriber hereby waives any and all right, title, interest or claim of any kind in or to any distributions by the Company from the trust account which will be established for the benefit of the Company’s
public stockholders and into which substantially all of the proceeds of the IPO will be deposited (the “Trust Account”), in the event of a liquidation of the Company upon the Company’s failure to timely complete an initial
business combination. For purposes of clarity, in the event Subscriber subscribes for and purchases shares of common stock in the IPO or in the aftermarket, any additional Shares so subscribed for and purchased shall be eligible to receive any
liquidating distributions by the Company. However, in no event will the Subscriber have the right to redeem any shares of common stock held by such Subscriber into funds held in the Trust Account upon the successful completion of an initial business
combination. 

	5.	 Restrictions on Transfer. 

 

	 	5.1.	 Securities Law Restrictions. In addition to any restrictions to be contained in that certain letter
agreement (commonly known as an “Insider Letter”) to be dated as of the closing of the IPO by and between the Subscriber and the Company, Subscriber agrees not to sell, transfer, pledge, hypothecate or otherwise dispose of all or
any part of the Shares unless, prior thereto (a) a registration statement on the appropriate form under the Securities Act and applicable state securities laws with respect to the Shares proposed to be transferred shall then be effective or
(b) the Company has received an opinion from counsel reasonably satisfactory to the Company, that such registration is not required because such transaction is exempt from registration under the Securities Act and the rules promulgated by
the Securities and Exchange Commission thereunder and with all applicable state securities laws. 

  

	 	5.2.	 Restrictive Legends. Any certificates representing the Shares shall have endorsed thereon legends
substantially as follows: 

 “THE SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE UNITED STATES
SECURITIES ACT OF 1933, AS AMENDED, OR ANY STATE SECURITIES LAWS AND NEITHER THE SECURITIES NOR ANY INTEREST THEREIN MAY BE OFFERED, SOLD, TRANSFERRED, PLEDGED OR OTHERWISE DISPOSED OF EXCEPT PURSUANT TO AN EFFECTIVE REGISTRATION STATEMENT
UNDER SUCH ACT OR SUCH LAWS OR AN EXEMPTION FROM REGISTRATION UNDER SUCH ACT AND SUCH LAWS WHICH, IN THE OPINION OF COUNSEL, IS AVAILABLE.” 

“THE SECURITIES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO A LOCKUP AND MAY NOT BE OFFERED, SOLD, TRANSFERRED, PLEDGED OR
OTHERWISE DISPOSED DURING THE TERM OF THE LOCKUP.” 
  

	 	5.3.	 Additional Shares or Substituted Securities. In the event of the declaration of a share dividend, the
declaration of an extraordinary dividend payable in a form other than shares of common stock, a spin-off, a share split, an adjustment in conversion ratio, a recapitalization or a similar transaction affecting
the Company’s outstanding shares of common stock without receipt of consideration, any new, substituted or additional securities or other property which are by reason of such transaction distributed with respect to any Shares subject to this
Section 5 or into which such Shares thereby become convertible shall immediately be subject to this Section 5 and Section 3. Appropriate adjustments to reflect the distribution of such securities or property shall be made to the
number and/or class of Shares subject to this Section 5 and Section 3. 

  

	 	5.4.	 Registration Rights. Subscriber acknowledges that the Shares are being subscribed for and purchased
pursuant to an exemption from the registration requirements of the Securities Act and will become freely tradable only after certain conditions are met or they are registered pursuant to a registration rights agreement to be entered into with the
Company prior to the closing of the IPO (the “Registration Rights Agreement”). 

	6.	 Other Agreements. 

 

	 	6.1.	 Further Assurances. Subscriber agrees to execute such further instruments and to take such further
action as may reasonably be necessary to carry out the intent of this Agreement. 

  

	 	6.2.	 Notices. All notices, statements or other documents which are required or contemplated by this Agreement
shall be: (i) in writing and delivered personally or sent by first class registered or certified mail, overnight courier service or facsimile or electronic transmission to the address designated in writing, (ii) by facsimile to the number
most recently provided to such party or such other address or fax number as may be designated in writing by such party and (iii) by electronic mail, to the electronic mail address most recently provided to such party or such other electronic
mail address as may be designated in writing by such party. Any notice or other communication so transmitted shall be deemed to have been given on the day of delivery, if delivered personally, on the business day following receipt of written
confirmation, if sent by facsimile or electronic transmission, one (1) business day after delivery to an overnight courier service or five (5) days after mailing if sent by mail. 

 

	 	6.3.	 Entire Agreement. This Agreement, together with that certain Insider Letter and the Registration Rights
Agreement, each to be entered into among the Subscriber and the Company and each substantially in the form to be filed as an exhibit to the Registration Statement on Form S-1 associated with the
Company’s IPO, embodies the entire agreement and understanding among the Subscriber and the Company with respect to the subject matter hereof and supersedes all prior oral or written agreements and understandings relating to the subject matter
hereof. No statement, representation, warranty, covenant or agreement of any kind not expressly set forth in this Agreement shall affect, or be used to interpret, change or restrict, the express terms and provisions of this Agreement.

  

	 	6.4.	 Modifications and Amendments. The terms and provisions of this Agreement may be modified or amended only
by written agreement executed by all parties hereto. 

  

	 	6.5.	 Waivers and Consents. The terms and provisions of this Agreement may be waived, or consent for the
departure therefrom granted, only by a written document executed by the party entitled to the benefits of such terms or provisions. No such waiver or consent shall be deemed to be or shall constitute a waiver or consent with respect to any other
terms or provisions of this Agreement, whether or not similar. Each such waiver or consent shall be effective only in the specific instance and for the purpose for which it was given, and shall not constitute a continuing waiver or consent.

  

	 	6.6.	 Assignment. Except with respect to transfers of the Shares to a controlled affiliate of the Subscriber,
the rights and obligations under this Agreement may not be assigned by either party hereto without the prior written consent of the other party. 

	 	6.7.	 Benefit. All statements, representations, warranties, covenants and agreements in this Agreement shall
be binding on the parties hereto and shall inure to the benefit of the respective successors and permitted assigns of each party hereto. Nothing in this Agreement shall be construed to create any rights or obligations except among the parties
hereto, and no person or entity shall be regarded as a third-party beneficiary of this Agreement. 

  

	 	6.8.	 Governing Law. This Agreement and the rights and obligations of the parties hereunder shall be construed
in accordance with and governed by the laws of Delaware applicable to contracts wholly performed within the borders of such state, without giving effect to the conflict of law principles thereof. 

 

	 	6.9.	 Severability. In the event that any court of competent jurisdiction shall determine that any provision,
or any portion thereof, contained in this Agreement shall be unreasonable or unenforceable in any respect, then such provision shall be deemed limited to the extent that such court deems it reasonable and enforceable, and as so limited shall remain
in full force and effect. In the event that such court shall deem any such provision, or portion thereof, wholly unenforceable, the remaining provisions of this Agreement shall nevertheless remain in full force and effect. 

 

	 	6.10.	 No Waiver of Rights, Powers and Remedies. No failure or delay by a party hereto in exercising any right,
power or remedy under this Agreement, and no course of dealing between the parties hereto, shall operate as a waiver of any such right, power or remedy of such party. No single or partial exercise of any right, power or remedy under this Agreement
by a party hereto, nor any abandonment or discontinuance of steps to enforce any such right, power or remedy, shall preclude such party from any other or further exercise thereof or the exercise of any other right, power or remedy hereunder. The
election of any remedy by a party hereto shall not constitute a waiver of the right of such party to pursue other available remedies. No notice to or demand on a party not expressly required under this Agreement shall entitle the party receiving
such notice or demand to any other or further notice or demand in similar or other circumstances or constitute a waiver of the rights of the party giving such notice or demand to any other or further action in any circumstances without such notice
or demand. 

  

	 	6.11.	 Survival of Representations and Warranties. All representations and warranties made by the parties
hereto in this Agreement or in any other agreement, certificate or instrument provided for or contemplated hereby, shall survive the execution and delivery hereof and any investigations made by or on behalf of the parties. 

 

	 	6.12.	 No Broker or Finder. Each of the parties hereto represents and warrants to the other that no broker,
finder or other financial consultant has acted on its behalf in connection with this Agreement or the transactions contemplated hereby in such a way as to create any liability on the other. Each of the parties hereto agrees to indemnify and save the
other harmless from any claim or demand for commission or other compensation by any broker, finder, financial consultant or similar agent claiming to have been employed by or on behalf of such party and to bear the cost of legal expenses incurred in
defending against any such claim. 

	 	6.13.	 Headings and Captions. The headings and captions of the various subdivisions of this Agreement are for
convenience of reference only and shall in no way modify or affect the meaning or construction of any of the terms or provisions hereof. 

  

	 	6.14.	 Counterparts. This Agreement may be executed in one or more counterparts, all of which when taken
together shall be considered one and the same agreement and shall become effective when counterparts have been signed by each party and delivered to the other party, it being understood that both parties need not sign the same counterpart. In the
event that any signature is delivered by facsimile transmission or any other form of electronic delivery, such signature shall create a valid and binding obligation of the party executing (or on whose behalf such signature is executed) with the same
force and effect as if such signature page were an original thereof. 

  

	 	6.15.	 Construction. The parties hereto have participated jointly in the negotiation and drafting of this
Agreement. If an ambiguity or question of intent or interpretation arises, this Agreement will be construed as if drafted jointly by the parties hereto and no presumption or burden of proof will arise favoring or disfavoring any party hereto because
of the authorship of any provision of this Agreement. The words “include,” “includes,” and “including” will be deemed to be followed by “without limitation.” Pronouns in masculine,
feminine, and neuter genders will be construed to include any other gender, and words in the singular form will be construed to include the plural and vice versa, unless the context otherwise requires. The words “this Agreement,”
“herein,” “hereof,” “hereby,” “hereunder,” and words of similar import refer to this Agreement as a whole and not to any particular subdivision unless expressly so limited. The
parties hereto intend that each representation, warranty, and covenant contained herein will have independent significance. If any party hereto has breached any representation, warranty, or covenant contained herein in any respect, the fact that
there exists another representation, warranty or covenant relating to the same subject matter (regardless of the relative levels of specificity) which such party hereto has not breached will not detract from or mitigate the fact that such party
hereto is in breach of the first representation, warranty, or covenant. 

  

	 	6.16.	 Mutual Drafting. This Agreement is the joint product of the Subscriber 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. 

 

	7.	 Voting and Tender of Shares. Subscriber agrees with the Company to vote the Shares in favor of an
initial business combination that the Company negotiates and submits for approval to the Company’s stockholders and shall not seek redemption with respect to such Shares. Additionally, Subscriber agrees not to tender any Shares in connection
with a tender offer presented to the Company’s stockholders in connection with an initial business combination negotiated by the Company. 

 If the foregoing accurately sets forth our understanding and agreement, please sign the enclosed copy of
this Agreement and return it to us. 
  

			
	Very truly yours,
	
	NAVSIGHT HOLDINGS, INC.
		
	By:	 	
                     
                   

	Name:	 	Jack Pearlstein
	Title:	 	Chief Financial Officer

 [Signature page to the Subscription Agreement] 

 Accepted and agreed as of the date first written above. 

SIX4 HOLDINGS, LLC 
  

			
	By:	 	  

	Name:	 	  

	Title:	 	  

 [Signature page to the Subscription Agreement]EX-10.5

  Exhibit 10.5 

[•], 2020 
 NavSight Holdings, Inc. 

12020 Sunrise Valley Drive , Suite 100 
 Reston, VA 20191 

Credit Suisse Securities (USA) LLC 
 Eleven Madison Avenue 

New York, NY 10010 
  

	Re:	 Initial Public Offering 

Ladies and Gentlemen: 
  This letter (the “Letter
Agreement”) is being delivered to you in accordance with the Underwriting Agreement (the “Underwriting Agreement”) entered into by and between NavSight Holdings, Inc., a Delaware corporation (the
“Company”) and Credit Suisse Securities (USA) LLC, as representative (the “Credit Suisse”), relating to an underwritten initial public offering (the “IPO”) of the Company’s
units (the “Units”), each unit comprised 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 exercisable for one share of Common Stock (each, a “Warrant”). Certain capitalized terms used herein are defined in paragraph 11
hereof. 
 In order to induce the Company and Credit Suisse to enter into the Underwriting Agreement and to proceed with the IPO, and in recognition of the
benefit that such IPO will confer upon the undersigned as a stockholder of the Company, and for other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, the undersigned hereby agrees with the Company as
follows: 
   

	1.	 If the Company solicits approval of its stockholders of a Business Combination, the undersigned will vote all
shares of Common Stock beneficially owned by it, whether acquired before, in or after the IPO, in favor of such Business Combination. 

  

	2.	 In the event that the Company does not complete a Business Combination within the time period set forth in the
Company’s amended and restated certificate of incorporation, as the same may be further amended from time to time (the “Charter”), the undersigned will, as promptly as possible, take all necessary actions 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 the IPO 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 Trust Account not previously released to the Company to pay its tax obligations, if any (less up to $100,000 of such net
interest to pay dissolution expenses and which interest shall be net of taxes payable), divided by the number of then outstanding IPO 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 Company’s board of directors,
dissolve and liquidate, subject in the cases of clauses (ii) and (iii) to the Company’s obligations under Delaware law to provide for claims of creditors and other requirements of applicable law. The undersigned hereby waives any and all
right, title, interest or claim of any kind in or to any distribution of the Trust Account and any remaining net assets of the Company as a result of such liquidation with respect to the Founder Shares owned by the undersigned. However, if the
undersigned has acquired IPO Shares in or after the IPO, it will be entitled to liquidating distributions from the Trust Account with respect to such IPO Shares in the event that the Company does not complete a Business Combination within the time
period set forth in the Charter. In the event of the liquidation of the Trust Account, the undersigned agrees that it will be liable to the Company if and to the extent any claims by a third party (other than the Company’s independent
registered public accounting firm) for services rendered or products sold to the Company, or a prospective target business with which the Company has discussed entering into a transaction agreement, reduce the amount of funds in the Trust Account to
below the lesser of (i) $10.00 per IPO Share and (ii) the actual amount per IPO Share held in the Trust Account as of the date of the liquidation of the Trust Account, if less than $10.00 per IPO Share due to reductions in the value of the
assets in the Trust Account, in each case less interest that may be withdrawn to pay the Company’s tax obligations, if any; provided that such liability will not apply to any claims by a third party or prospective target business who
executed a waiver of any and all rights to the monies held in the Trust Account (whether or not such waiver is enforceable) nor will it apply to any claims under the Company’s obligation to indemnify Credit Suisse against certain liabilities,
including liabilities under the Securities Act of 1933, as amended, pursuant to the Underwriting Agreement. The undersigned acknowledges and agrees that there will be no distribution from the Trust Account with respect to any Warrants, all rights of
which will terminate on the Company’s liquidation. 

  
 1 

	3.	 The undersigned acknowledges and agrees that prior to entering into a definitive agreement for a Business
Combination with a target business that is affiliated with the undersigned or any other Insiders of the Company or their affiliates, such transaction must be approved by a majority of the Company’s disinterested independent directors and the
Company must obtain an opinion from an independent investment banking firm, which is a member of the Financial Industry Regulatory Authority, or an independent accounting firm that such Business Combination is fair to the Company’s unaffiliated
stockholders from a financial point of view. 

  

	4.	 Neither the undersigned nor any affiliate of the undersigned will be entitled to receive and will not accept
any compensation or other cash payment from the Company prior to, or for services rendered in order to effectuate, the completion of the Business Combination; provided that the Company shall be allowed to make the payments set forth in the
Registration Statement adjacent to the caption “Prospectus Summary—The Offering—Limited payments to insiders.” 

  

	5.(a)	 The undersigned agrees that the Founder Shares may not be transferred, assigned or sold (except to certain
permitted transferees as described in the Registration Statement or herein) (the “Lockup”) until the earlier to occur of: (1) one year after the completion of a Business Combination or (2) the date following the
completion of the Company’s initial Business Combination on which the Company completes a liquidation, merger, stock exchange or other similar transaction that results in all of the Company’s stockholders having the right to exchange their
shares of Common Stock for cash, securities or other property. Notwithstanding the foregoing, if the closing price of the Company’s Common Stock equals or exceeds $12.00 per share (as adjusted for share splits, share capitalizations,
reorganizations, recapitalizations and the like) for any 20 trading days within any 30-trading day period commencing at least 150 days after the Company’s initial Business Combination, the Founder Shares
will be released from the Lockup. 

  

	  (b)	 Notwithstanding the provisions set forth in paragraphs 5(a) and 5(c), during the period commencing on the
effective date of the Underwriting Agreement and ending 180 days after such date, the undersigned will not, without the prior written consent of Credit Suisse pursuant to the Underwriting Agreement, (i) sell, offer to sell, contract or agree to
sell, hypothecate, pledge, hedge or otherwise dispose of or agree to dispose of (or enter into any transaction that is designed to, or might reasonably be expected to, result in the disposition (whether by actual disposition or effective economic
disposition due to cash settlement or otherwise) by the undersigned or any affiliate of the undersigned or any person in privity with the undersigned or any affiliate of the undersigned), directly or indirectly, including the filing (or
participation in the filing) of a registration statement with the Securities and Exchange Commission (the “SEC”) in respect of, or establish or increase a put equivalent position or liquidate or decrease a call equivalent
position within the meaning of Section 16 of the Securities Exchange Act of 1934, as amended, (the “Exchange Act”) and the rules and regulations of the SEC promulgated thereunder with respect to, any other Units, shares
of Common Stock, Founder Shares or Warrants or any securities convertible into, or exercisable, or exchangeable for, shares of Common Stock owned by it, him or her, (ii) enter into any swap or other arrangement that transfers to another, in
whole or in part, any of the economic consequences of ownership of any Units, shares of Common Stock, Founder Shares, Warrants or any securities convertible into, or exercisable, or exchangeable for, shares of Common Stock owned by it, him or her,
whether any such transaction is to be settled by delivery of such securities, in cash or otherwise, or (iii) publicly announce any intention to effect any transaction, including the filing of a registration statement, specified in clause
(i) or (ii). The provisions of this paragraph will not apply (i) to the transfer of Founder Shares to any independent director appointed or elected to the Company’s board of directors before or after the IPO or (ii) if the
release or waiver is effected solely to permit a transfer not for consideration and, in each case if (i) and (ii) the transferee has agreed in writing to be bound by the same terms described in this Letter Agreement to the extent and for the
duration that such terms remain in effect at the time of the transfer. 

  
 2 

	  (c)	 The undersigned agrees that until the Company completes an initial Business Combination, the undersigned’s
Private Placement Warrants will be subject to the transfer restrictions described in the Private Placement Warrants Purchase Agreement relating to the undersigned’s Private Placement Warrants. 

 

	  (d)	 Notwithstanding the provisions set forth in paragraphs 5(a) and (c), transfers, assignments and sales by the
undersigned of the Founder Shares, Private Placement Warrants and shares of Common Stock issued or issuable upon the exercise of the Private Placement Warrants or conversion of the Founder Shares are permitted (i) 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 undersigned or their affiliates, any affiliates of the undersigned, or any employees of such affiliates; (ii) in
the case of an individual, by gift to a member of the individual’s immediate family or to a trust, the beneficiary of which is a member of one of the individual’s immediate family, an affiliate of such person or to a charitable
organization; (iii) in the case of an individual, by virtue of laws of descent and distribution upon death of the individual; (iv) in the case of an individual, pursuant to a qualified domestic relations order; (v) by private sales or
transfers made in connection with the completion of the Business Combination at prices no greater than the price at which the Founder Shares, Private Placement Warrants or shares of Common Stock, as applicable, were originally purchased;
(vi) by virtue of the undersigned’s organizational documents upon liquidation or dissolution of the undersigned; (vii) to the Company for no value for cancellation in connection with the completion of the Business Combination;
(viii) in the event of the Company’s liquidation prior to the completion of a Business Combination; or (ix) in the event of completion of a liquidation, merger, share exchange or other similar transaction which results in all of the
Company’s stockholders having the right to exchange their shares of Common Stock for cash, securities or other property subsequent to the completion of a Business Combination; provided, however, that in the case of clauses
(i) through (vi) these permitted transferees must enter into a written agreement agreeing to be bound by the restrictions herein. For the avoidance of doubt, the transfers of Founder Shares, Private Placement Warrants and shares of Common Stock
issued or issuable upon the exercise of the Private Placement Warrants or conversion of the Founder Shares shall be permitted regardless of whether a filing under Section 16(a) of the Exchange Act shall be required or shall be voluntarily made
with respect to such transfers. 

  

	6.	 The undersigned agrees that it shall not transfer any Private Placement Warrants (or shares of Common Stock
issued or issuable upon the exercise or conversion of the Private Placement Warrants), until 30 days after the completion of a Business Combination. 

   

	7.	 The undersigned has full right and power, without violating any agreement by which it is bound, to enter into
this Letter Agreement. 

  

	8.	 The undersigned represents and warrants that: 

(i)    it 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. 
 (ii)    each questionnaire
furnished to the Company, if any, is true and accurate in all respects. 
 (iii)    it 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; it 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 it is not currently a defendant in any such criminal proceeding. 

 

	9.	 The undersigned hereby waives any right to exercise redemption rights with respect to any of the Company’s
shares of Common Stock owned or to be owned by the undersigned, directly or indirectly, whether such shares be part of the Founder Shares or IPO Shares, and agrees not to seek redemption with respect to such shares (or sell such shares to the
Company in any tender offer) in connection with any stockholder vote to approve (x) a Business Combination or (y) an amendment to the Charter that would affect the substance or timing of the Company’s obligation to allow redemption in
connection with the Business Combination or to redeem 100% of the shares of Common Stock if the Company has not completed a Business Combination within 24 months from the closing of the IPO. 

 

	10.	 The undersigned hereby agrees to not propose, or vote in favor of, an amendment to the Company’s Charter
(i) to modify the substance or timing of the Company’s obligation to allow redemption in connection with the Company’s initial Business Combination or to redeem 100% of the IPO Shares if the Company does not complete its initial Business
Combination within 24 months from the closing of the IPO, or (ii) with respect to any other provision relating to shareholders’ rights or pre-initial Business Combination activity unless the Company provides its public stockholders with the
opportunity to redeem their IPO 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 (which interest shall be net of taxes payable),
divided by the number of then issued and outstanding IPO Shares. 

  

	11.	 To the extent that Credit Suisse does not exercise their over-allotment option to purchase up to an additional
3,000,000 Units within 45 days from the date of the Prospectus (and as further described in the Prospectus), the Sponsor agrees that it shall forfeit, at no cost, a number of Founder Shares in the aggregate equal to 750,000 multiplied by a fraction,
(i) the numerator of which is 3,000,000 minus the number of Units purchased by the Underwriters upon the exercise of their over-allotment option, and (ii) the denominator of which is 3,000,000. 

 

	12.	 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 undersigned hereby (i) agrees that any action, proceeding or claim against him arising
out of or relating in any way to this Letter Agreement shall be brought and enforced in the courts of the State of New York of the United States of America for the Southern District of New York, and irrevocably submits to such jurisdiction, which
jurisdiction shall be exclusive and (ii) waives any objection to such exclusive jurisdiction and that such courts represent an inconvenient forum. 

  
 3 

	13.	 As used herein, (i) a “Business Combination” shall mean a merger, stock exchange,
asset acquisition, stock purchase, recapitalization, reorganization or other similar business combination with one or more businesses or entities; (ii) “Insiders” shall mean all officers, directors and sponsors of the Company
immediately prior to the IPO; (iii) “Founder Shares” shall mean all of the Class B Common Stock of the Company, par value $0.0001 per share, acquired by an Insider prior to the IPO; (iv) “IPO
Shares” shall mean the shares of Common Stock issued in the Company’s IPO; (v) “Private Placement Warrants” shall mean the warrants that are being sold privately by the Company simultaneously with the
consummation of the IPO; (vi) “Trust Account” shall mean the trust account into which the net proceeds of the Company’s IPO and a portion of the proceeds from the sale of the Private Placement Warrants will be deposited;
and (vii) “Registration Statement” means the Company’s registration statement on Form S-1 (SEC File No. 333-240100) filed with the SEC,
as amended. 

  

	14.	 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. 

 

	15.	 The undersigned acknowledges and understands that Credit Suisse and the Company will rely upon the agreements,
representations and warranties set forth herein in proceeding with the IPO and further agrees that Credit Suisse shall be a third party beneficiary of this Letter Agreement. Nothing contained herein shall be deemed to render Credit Suisse a
representative of, or a fiduciary with respect to, the Company, its stockholders or any creditor or vendor of the Company with respect to the subject matter hereof. 

 

	16.	 The undersigned hereby agrees and acknowledges that: (i) Credit Suisse and the Company would be irreparably
injured in the event of a breach by such the undersigned of its obligations set forth in this Letter Agreement (ii) monetary damages may not be an adequate remedy for such breach and (iii) the non-breaching party shall be entitled to seek injunctive
relief, in addition to any other remedy that such party may have in law or in equity, in the event of such breach. 

  

	17.	 This Letter Agreement shall be binding on the undersigned and such person’s respective successors, heirs,
personal representatives and assigns. This Letter Agreement shall terminate on the earlier of (i) the completion of a Business Combination and (ii) the liquidation of the Company; provided, that such termination shall not relieve
the undersigned from liability for any breach of this agreement prior to its termination. The parties hereto may not assign either this Letter Agreement or any of their rights, interests, or obligations hereunder without the prior written consent of
the other party. 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. 

 

	18.	 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. 

 

	19.	 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 or other electronic transmission. 

 

	20.	 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. 

[Signature Page Follows] 

  
 4 

 
			
	 SIX4 HOLDINGS, LLC

		
	 By:
	 	 
	 Name:
	 	
	 Title:
	 	
	
	 Acknowledged and Agreed:

	
	 NAVSIGHT HOLDINGS, INC.

		
	 By:
	 	 
	 Name:
	 	
	 Title:
	 	

  
  [Signature
Page to Letter Agreement]

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