Document:

Exhibit 10.5

 

FORWARD
PURCHASE AGREEMENT 

 

February
24, 2021

 

Engaged
Capital, LLC

610
Newport Center Drive, Suite 250

Newport
Beach, California 92660

 

Ladies
and Gentlemen:

 

We
are pleased to accept the offer Engaged Capital, LLC (the “Subscriber”) has made to purchase an aggregate of
10,000,000 shares (the “Securities”) of Class A common stock, par value $0.0001 (the “Class A Common
Stock”), of SilverBox Engaged Merger Corp I, a Delaware corporation (the “Company”), for an aggregate
purchase price of $100,000,000 in connection with the Company’s initial public offering of units, each comprising one share
of Class A Common Stock and one-third of one warrant (the “IPO”). The IPO is expected as of the date hereof
to generate gross proceeds to the Company in the amount of $300,000,000 (exclusive of the over-allotment option to be granted
to the underwriters). This letter agreement (this “Agreement”) sets forth the terms on which the Company is
willing to sell the Securities to the Subscriber, and the Company and the Subscriber’s agreements regarding such Securities,
are as follows:

 

1. Purchase
of the Securities. For the sum of $100,000,000 (the “Purchase Price”), at the Closing (as defined herein),
the Company agrees to sell to the Subscriber the number of Securities set forth opposite the Subscriber’s name on Exhibit
A hereto, and the Subscriber hereby agrees to purchase such Securities from the Company (the “Forward Purchase”),
subject to the terms and subject to the conditions set forth in this Agreement.

 

2. Representations,
Warranties and Agreements.

  

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

 

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

  

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 the
Subscriber, (ii) any agreement, indenture or instrument to which the Subscriber is a party, (iii) any law, statute, rule or regulation
to which the Subscriber is subject, or (iv) any agreement, order, judgment or decree to which the Subscriber is subject, in each
case (other than clause (i)), which would have a material adverse effect on the Subscriber or its ability to consummate the transactions
contemplated by this Agreement.

 

     

     

    

 

2.1.3 Organization
and Authority. The Subscriber is a Delaware limited liability company, validly existing and in good standing under the laws
of Delaware and possesses all requisite power and authority necessary to carry out the transactions contemplated by this Agreement.
Upon execution and delivery by the Subscriber and the Company, this Agreement is a legal, valid and binding agreement of the Subscriber,
enforceable against the Subscriber in accordance with its terms, except as such enforceability may be limited by applicable bankruptcy,
insolvency, reorganization, moratorium, 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. The Subscriber is: (i) sophisticated in financial matters, is able to evaluate the risks
and benefits of the investment in the Securities and has the capacity to protect its own interests and (ii) able to bear the economic
risk of its investment in the Securities for an indefinite period of time because the Securities have not been registered under
the Securities Act of 1933, as amended (the “Securities Act”), and therefore cannot be sold unless pursuant
to an effective registration statement under the Securities Act (including pursuant to the Registration Rights Agreement (as defined
below)) or an exemption from such registration is available with respect to such sale. The Subscriber is able to afford a complete
loss of the Subscriber’s investment in the Securities.

 

2.1.5 Access
to Information; Independent Investigation. Prior to the execution of this Agreement, the 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, the Subscriber has relied solely
on the Subscriber’s own knowledge and understanding of the Company and its business based upon the Subscriber’s own
due diligence investigation and the information furnished pursuant to this paragraph. The 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 the 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. The Subscriber represents that it is an “accredited investor” as such term is defined in Rule 501(a)
of Regulation D promulgated under 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 promulgated
under the Securities Act or similar exemptions under federal or state law.

 

2.1.7 Investment
Purposes. The Subscriber is purchasing the Securities solely for investment purposes, for the 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.
The 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 of Regulation D promulgated under the Securities Act.

 

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2.1.8 Restrictions
on Transfer; Shell Company. The Subscriber understands the Securities are being offered in a transaction not involving a public
offering within the meaning of the Securities Act. The Subscriber understands the Securities will be “restricted securities”
within the meaning of Rule 144(a)(3) under the Securities Act and the Subscriber understands that any certificates representing
the Securities will contain a legend in respect of such restrictions. If in the future the Subscriber decides to offer, resell,
pledge or otherwise transfer the Securities, such Securities may be offered, resold, pledged or otherwise transferred only pursuant
to: (i) registration under the Securities Act or (ii) an available exemption from registration. The Subscriber agrees that if
any transfer of its Securities or any interest therein is proposed to be made, as a condition precedent to any such transfer,
the Subscriber may be required to deliver to the Company an opinion of counsel satisfactory to the Company. Absent registration
or an exemption, the Subscriber agrees not to resell the Securities. The Subscriber further acknowledges that because the Company
is a shell company, Rule 144 may not be available to the Subscriber for the resale of the Securities until one (1) year following
consummation of the Company’s initial business combination (“the “Business Combination”), despite
technical compliance with the requirements of Rule 144 and the release or waiver of any contractual transfer restrictions.

 

2.1.9 No
Governmental or Other Consents. No governmental, administrative or other third party consents, order or authorization, registration,
qualification, designation, declaration, filing, or approvals are required or necessary on the part of the Subscriber in connection
with the transactions contemplated by this Agreement.

 

2.1.10
Affiliation of Certain FINRA Members. The Subscriber is neither a person associated nor affiliated with Citigroup Global
Markets Inc. or Deutsche Bank Securities Inc. or, to its actual knowledge, any other member of the Financial Industry Regulatory
Authority (“FINRA”) that is participating in the IPO.

 

2.1.11 No
Public Market. The Subscriber understands that no public market now exists for the Securities, and that the Company has
made no assurances that a public market will ever exist for the Securities.

 

2.1.12 High
Degree of Risk. The Subscriber understands that its agreement to purchase the Securities involves a high degree of risk
which could cause the Subscriber to lose all or part of its investment.

 

2.1.13 No
General Solicitation. Neither the Subscriber, nor, to its knowledge, any of its officers, directors, employees, agents,
stockholders or partners has either directly or indirectly, including, through a broker or finder (i) engaged in any general
solicitation, or (ii) published any advertisement in connection with the offer and sale of the Securities.

 

2.1.14 Adequacy
of Financing. At the time of the Closing, the Subscriber will have available to it sufficient funds to satisfy its obligations
under this Agreement.

 

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2.2 Company’s
Representations, Warranties and Agreements. To induce the Subscriber to purchase the Securities, the Company hereby represents
and warrants to the Subscriber as follows: 

 

2.2.1 Organization
and Corporate Power. The Company is a Delaware corporation duly incorporated and validly existing and in good standing under
the laws of the State of Delaware. The Company 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 its business as presently conducted
and as proposed to be conducted, including, without limitation, the transactions contemplated by this Agreement. The Company has
no subsidiaries.

 

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 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 (iv) any agreement, order, judgment or decree to which the Company is subject.

 

2.2.3 Title
to Securities. Upon issuance in accordance with, and payment pursuant to, the terms hereof, the Securities will be duly and
validly issued, fully paid and non-assessable. Upon issuance in accordance with, and payment pursuant to, the terms hereof the
Subscriber will have or receive good title to the Securities, free and clear of all liens, claims and encumbrances of any kind,
other than (i) transfer restrictions described herein and under federal and state securities laws, and (ii) liens, claims or encumbrances
imposed due to the actions of the Subscriber. Assuming the accuracy of the representations of the Subscriber in this Agreement,
the Securities will be issued in compliance with all applicable federal and state securities laws.

 

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 such transactions or seeks to recover damages or to obtain other relief in connection
with any such transactions.

 

2.2.5 Authorization.
All corporate action on the part of the Company, its officers, directors and stockholders necessary for the authorization, execution
and delivery of this Agreement, the Securities, the performance of all obligations of the Company required pursuant hereto, and
the authorization, issuance or reservation for issuance of the Securities, has been taken. Upon execution and delivery by the
Company and the Subscriber of this Agreement, this Agreement constitutes a valid and legally binding obligation of the Company,
enforceable in accordance with its terms, except as such enforceability may be limited by applicable bankruptcy, insolvency, reorganization,
moratorium, 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).

 

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2.2.6 Capitalization.
The authorized capital stock of the Company on the date hereof, consists of 100,000,000 shares of Class A Common Stock, no shares
of which are issued and outstanding, 10,000,000 shares of Class B common stock, par value $0.0001 per share (“Class B
Common Stock” and, collectively with the Class A Common Stock, the “Common Stock”), 8,625,000 shares
of which are issued and outstanding (including up to 1,125,000 shares subject to forfeiture in the event that the underwriters’
over-allotment option is not exercised in full), and 1,000,000 shares of preferred stock, no shares of which are issued and outstanding.
All issued and outstanding shares of the Class B Common Stock (i) have been duly authorized and validly issued and (ii) are fully
paid and non-assessable. The rights, preferences, privileges and restrictions of the Common Stock are as stated in the Certificate
of Incorporation currently on file with the Delaware Secretary of State. There are no outstanding rights, options, warrants, preemptive
rights, rights of first refusal or similar rights for the purchase or acquisition from the Company of any securities of the Company.

 

2.2.7 No
Governmental or Other Consents. No governmental, administrative or other third party consents, approvals, notices or filings
are required or necessary on the part of the Company in connection with the transactions contemplated by this Agreement, other
than the filing of a Form D with the Securities and Exchange Commission (the “SEC”) and such state Blue
Sky, FINRA and Nasdaq (or other applicable stock exchange) consents and approvals as may be required.

 

2.2.8
Operations.  As of the date hereof, the Company has not conducted, and prior to the Closing the Company will
not conduct, any operations other than as described in the Registration Statement (as defined below).

 

3. Settlement
Date and Delivery.

 

3.1 Closing.
The Company shall deliver a notice to the Subscriber, at least five (5) Business Days before the closing of the Business Combination
(the “Business Combination Closing”) (or such lesser number of days as the Subscriber may consent to in writing),
specifying the date of the Business Combination Closing, the aggregate Purchase Price for the Securities to be purchased by the
Subscriber and instructions for wiring the Purchase Price. The closing of the sale of the Securities (the “Closing”)
shall be held on the same date and immediately prior to the Business Combination Closing (such date being referred to as the “Forward
Closing Date”). Except as otherwise mutually agreed by the parties hereto, at least one (1) Business Day prior to the
Forward Closing Date, the Subscriber shall deliver to the Company, to be held in escrow until the Closing, the Purchase Price
for the Securities by wire transfer of U.S. dollars in immediately available funds to the account specified by the Company in
such notice. Immediately prior to the Closing on the Forward Closing Date, (i) the Purchase Price shall be released from escrow
automatically and without further action by the Company or the Subscriber and (ii) upon such release, the Company shall issue
the Securities to the Subscriber in book-entry form, free and clear of any liens or other restrictions whatsoever (other than
those arising under state or federal securities laws), registered in the name of the Subscriber (or its nominee in accordance
with its delivery instructions), or to a custodian designated by the Subscriber, as applicable. In the event the Business Combination
Closing does not occur on the date scheduled for closing (unless otherwise extended), the Closing shall not occur and the Company
shall promptly (but not later than one (1) Business Day thereafter) return the Purchase Price to the Subscriber. For purposes
of this Agreement, “Business Day” means any day, other than a Saturday or a Sunday, that is neither a legal
holiday nor a day on which banking institutions are generally authorized or required by law or regulation to close in the City
of New York, New York.

 

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3.2 Conditions
to Closing of the Company. The Company’s obligations to sell and issue the Securities at the Closing are subject to
the fulfillment at or prior to the Closing, as applicable, of each of the following conditions:

 

3.2.1 Representations
and Warranties Correct. The representations and warranties made by the Subscriber in Section 2.1 hereof shall be true and
correct in all material respects when made and shall be true and correct in all material respects on and as of the Forward Closing
Date (unless they specifically speak as of another date in which case they shall be true and correct in all material respects
as of such date) with the same force and effect as if they had been made on and as of said date.

 

3.2.2 Blue
Sky. The Company shall have obtained all necessary Blue Sky law permits and qualifications, or secured an exemption therefrom,
required by any state for the offer and sale of the Securities.

 

3.2.3
No Injunction. No order, writ, judgment, injunction, decree, determination, or award shall have been entered by or with
any governmental, regulatory, or administrative authority or any court, tribunal, or judicial, or arbitral body, and no other
legal restraint or prohibition shall be in effect, preventing the purchase by the Subscriber of the Securities.

 

3.3 Conditions
to Closing of the Subscriber. The Subscriber’s obligation to purchase the Securities at the Closing is subject to the
fulfillment on or prior to the Forward Closing Date, as applicable, of each of the following conditions:

 

3.3.1 Representations
and Warranties Correct. The representations and warranties made by the Company in Section 2.2 of this Agreement shall be true
and correct in all material respects when made and shall be true and correct in all material respects on and as of the Forward
Closing Date (unless they specifically speak as of another date in which case they shall be true and correct in all material respects
as of such date) with the same force and effect as if they had been made on and as of said date.

 

3.3.2 Covenants.
All covenants, agreements and conditions contained in this Agreement to be performed by the Company on or prior to the Forward
Closing Date shall have been performed or complied with in all material respects.

 

3.3.3 Blue
Sky. The Company shall have obtained all necessary Blue Sky law permits and qualifications, or secured an exemption therefrom,
required by any state for the offer and sale of the Securities.

 

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3.3.4 Registration
Rights Agreement. The Company and the Subscriber shall have entered into a registration rights agreement (the “Registration
Rights Agreement”) in the form mutually agreed upon by the Company and the Susbscriber.

 

3.3.5 IPO
Closing. The Company shall have consummated an IPO raising at least $300,000,000 in gross proceeds.

 

3.3.6 Business
Combination. The Company shall have entered into an agreement with respect to the Business Combination and all conditions
to the closing of the Business Combination as set forth in such agreement, including the approval by the Company’s stockholders
of the Business Combination, if applicable, shall have been satisfied or waived. 

 

3.3.7
No Injunction. No order, writ, judgment, injunction, decree, determination, or award shall have been entered by or with
any governmental, regulatory, or administrative authority or any court, tribunal, or judicial, or arbitral body, and no other
legal restraint or prohibition shall be in effect, preventing the purchase by the Subscriber of the Securities.

 

4. Forward
Transferees. All of the Subscriber’s rights and obligations hereunder with respect to the Forward Purchase may be transferred
or assigned, at any time and from time to time prior to the consummation of a Business Combination and in whole or in part, to
any one or more third parties (each, a “Forward Transferee”), subject to the Company’s prior written
consent, which may not be unreasonably withheld.  Upon any such transfer or assignment:

 

4.1
the Subscriber and applicable Forward Transferee shall execute an assignment and joinder in the form attached hereto as Exhibit
B (a “Joinder Agreement”), which shall reflect the number of Securities such Forward Transferee shall
have the right and obligation to purchase (the “Forward Transferee Securities”), and, upon such execution,
such Forward Transferee shall have all the same rights and obligations of the Subscriber hereunder with respect to the Forward
Transferee Securities, and references herein to the “Subscriber” shall be deemed to refer to and include any
such Forward Transferee with respect to such Forward Transferee and to such Forward Transferee’s Forward Transferee
Securities; provided, that any representations, warranties, covenants and agreements of the Subscriber and any such
Forward Transferee shall be several and not joint and shall be made as to the Subscriber or any such Forward Transferee,
as applicable, as to itself only; and

 

4.2
upon a Forward Transferee’s execution and delivery of a Joinder Agreement, the number of Securities permitted to be purchased
by the Subscriber in the Forward Purchase hereunder shall be reduced by the total number of Securities permitted to be purchased
by the applicable Forward Transferee pursuant to the applicable Joinder Agreement, which reduction shall be evidenced by the Company
amending Exhibit A to this Agreement to reflect each transfer.  For the avoidance of doubt, this Agreement
need not be amended and restated in its entirety, but only Exhibit A need be amended upon the occurrence
of any such transfer of Forward Transferee Securities and the Company shall promptly deliver a copy of such amended Exhibit
A to each Subscriber (including each Forward Transferee) hereunder. 

 

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4.3
Notwithstanding anything to the contrary herein, if one or more of the Forward Transferees shall default in its or their obligations
to purchase the Securities, then Engaged Capital, LLC shall promptly purchase the Securities to which the default relates.

 

5. Restrictions
on Transfer of Securities.

 

5.1 Securities
Law Restrictions. The Subscriber hereby agrees not to sell, transfer, pledge, hypothecate or otherwise dispose of all or any
part of the Securities unless, prior thereto (i) a registration statement on the appropriate form under the Securities Act and
applicable state securities laws with respect to the Securities proposed to be transferred shall then be effective or (ii) the
Company has received an opinion of counsel for 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 SEC thereunder and under all applicable state
securities laws.

 

5.2 Lock-up.
Subscriber hereby agrees not to, except to certain permitted transferees (as such term defined in the prospectus for the IPO),
sell, transfer, pledge, hypothecate or otherwise dispose of all or a portion of the Securities until the later of (i) the expiration
of any lock-up applicable to any of the Company’s equity securities issued in a private placement in connection with the
Business Combination or (ii) 30 days following the closing of the Business Combination, provided that, for the avoidance of doubt,
the Company may file a registration statement with respect to such Securities prior to the expiration of the lock-up.

 

5.3 Restrictive
Legends.

 

5.3.1
Restrictive Legends. Subject to Section 5.3.2, the book entry for the Securities shall contain a notation, and each certificate
(if any) representing any Securities shall have endorsed thereon a legend substantially as follows:

 

“THE
SECURITIES REPRESENTED HEREBY HAVE NOT BEEN REGISTERED UNDER THE 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 FOR THE COMPANY, IS AVAILABLE.”

 

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

 

5.3.2
Legend Removal.  If the Securities are eligible to be sold pursuant to an effective registration statement or
without restriction under, and without the Company being in compliance with the current public information requirement of, Rule
144 under the Securities Act, then at the Subscriber’s request, including in connection with any transfer by the Subscriber
of the Securities to the account of a DTC participant without prior sale, the Company will cause the Company’s transfer
agent to remove any restrictive legend set forth on such Securities.  In connection therewith, if required by the Company’s
transfer agent, the Company will promptly cause an opinion of counsel to be delivered to and maintained with its transfer agent,
together with any other authorizations, certificates and directions required by the transfer agent that authorize and direct the
transfer agent to issue such Securities without any such legend.

 

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5.4 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 Common Stock, a spin-off, a share split, an adjustment in conversion ratio, a recapitalization
or a similar transaction affecting the Company’s outstanding Common Stock without receipt of consideration (other than those
occurring at the time of the IPO in connection with a change in the size of the offering), any new, substituted or additional
securities or other property which are by reason of such transaction distributed with respect to any Securities subject to this
Section 5 or into which such Securities 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
Securities subject to this Section 5 and Section 3. The Securities shall not be subject to forfeiture upon failure of the underwriters
to exercise their over-allotment option in the IPO. 

 

6. Other
Agreements.

 

6.1 Further
Assurances. Each of the Company and the Subscriber agrees to execute such further instruments and to take such further action
as may reasonably be requested by the other party 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 in writing and shall
be deemed effectively given upon the earlier of actual receipt and (i) personal delivery, (ii) five (5) days after having been
sent by first class registered or certified mail, (iii) one (1) Business Day after delivery to an overnight courier service or
(iv) one (1) Business Day after transmission by e-mail. All such communications sent to the Company shall be sent to: SilverBox
Engaged Merger Corp I, 8801 Calera Dr., Austin TX 78735, Attn: Stephen M. Kadenacy, or to such other address as may be designated
in writing by the Company from time to time. All such communications sent to the Subscriber shall be sent to the Subscriber’s
address or email address, as applicable, as set forth on Exhibit A hereto, or to such other address as may be designated
in writing by the Subscriber from time to time, in which event the Company shall amend Exhibit A hereto to reflect such
new address.

 

6.3 Entire
Agreement. This Agreement, together with any documents, instruments and writings that are delivered pursuant hereto or referenced
herein, embodies the entire agreement and understanding between 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.

 

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6.5 Waivers
and Consents. The terms and provisions of this Agreement may be waived, or consent for the departure therefrom granted, only
by 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.
This Agreement, and the rights and obligations hereunder (including the Subscriber’s rights and obligation to purchase the
Securities), may not be assigned, in whole or in party, by either party hereto without the prior written consent of the other
party, which consent may not be unreasonably withheld by the Company with respect to assignments by the Subscriber contemplated
by Section 4 .

 

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 and Venue. This Agreement and the rights and obligations of the parties hereunder shall be construed in accordance with
and governed by the laws of New York applicable to contracts wholly performed within the borders of such state, without giving
effect to the conflict of law principles thereof. The parties hereto (i) agree that any action, proceeding, claim or dispute arising
out of, or relating in any way to, this Agreement shall be brought and enforced in the federal or state courts of New York City,
in the State of New York, and the applicable appellate courts therefrom, 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, subject to the provisions of the Securities Act or the Securities Exchange Act of
1934, as amended.

 

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.

 

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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,
any investigations made by or on behalf of the parties, the consummation of the transactions contemplated by this Agreement and
the termination hereof.

 

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 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.

 

    11

     

    

 

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. No
Short Sales. The Subscriber hereby agrees that neither it, nor any person or entity acting on its behalf or pursuant
to any understanding with it, will engage in any Short Sales with respect to securities of the Company prior to the Business Combination
Closing. For purposes of this Section, “Short Sales” shall include, without limitation, all “short
sales” as defined in Rule 200 promulgated under Regulation SHO under the Exchange Act, and all types of direct and
indirect stock pledges (other than pledges in the ordinary course of business as part of prime brokerage arrangements), forward
sale contracts, options, puts, calls, swaps and similar arrangements (including on a total return basis), and sales and other
transactions through non-U.S. broker dealers or foreign regulated brokers.

 

8. Indemnification.
Each party shall indemnify the other against any loss, cost or damages (including reasonable attorney’s fees and expenses)
incurred as a result of such party’s breach of any representation, warranty, covenant or agreement in this Agreement.

 

9. Term.

 

9.1
Termination. Unless otherwise terminated by mutual agreement, the Subscriber’s obligation to acquire the Securities
hereunder, and the Company’s obligation to sell the Securities hereunder, shall be in effect until the occurrence of any
of the following (upon which occurrence this Agreement shall automatically terminate): (i) the consummation of the Business Combination
within the time frame permitted by the Company’s amended and restated certificate of incorporation (the “Charter”),
which, as of the date hereof, is expected to be 24 months from the consummation of the IPO (or 27 months if the Company enters
into a letter of intent in connection with the Business Combination), including any extensions beyond such term effected pursuant
to the terms of the Charter, and (ii) the liquidation of the Company in the event that the Company is unable to consummate the
Business Combination within the time frame permitted by the Charter (including any extensions).

 

9.2
Effect of Termination. In the event of any termination of this Agreement pursuant to this Section 9, the Purchase Price
(and interest thereon, if any), if previously paid, and all of the Subscriber’s funds paid in connection herewith shall
be promptly returned to the Subscriber, and thereafter this Agreement shall forthwith become null and void and have no effect,
without any liability on the part of the Subscriber or the Company and their respective directors, officers, employees, partners,
managers, members, stockholders or other equityholders and all rights and obligations of each party shall cease; provided,
however, that nothing contained in this Section 9 shall relieve any party from liabilities or damages arising out of any
fraud or willful breach by such party of any of its representations, warranties, covenants or agreements contained in this Agreement.

 

    12

     

    

 

10. Disclosure.
The Subscriber hereby acknowledges that (i) the terms of this Agreement will be disclosed in the registration statement filed
by the Company for its IPO (the “Registration Statement”), (ii) this Agreement will be filed with the SEC as
an exhibit to the Registration Statement and (iii) the Company will disclose the terms of this Agreement to potential IPO investors
and to potential Business Combination targets.

 

11. Waiver
of Claims Against Trust. The Subscriber hereby acknowledges that it is aware that the Company will establish a trust account
(the “Trust Account”) for the benefit of its public stockholders upon the closing of the IPO. The Subscriber
hereby agrees that it has no right, title, interest or claim of any kind in or to any monies held in the Trust Account, except
for redemption and liquidation rights the Subscriber may have in respect of any shares of Class A Common Stock issued as part
of the units sold in the IPO (“Public Shares”) held by the Subscriber, if any. The Subscriber hereby agrees
that it shall have 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, except for redemption and liquidation rights the Subscriber may have in respect of any Public Shares
held by the Subscriber, if any. In the event the Subscriber has any Claim against the Company under this Agreement, the Subscriber
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, except for redemption and liquidation rights the Subscriber may have in respect of any Public Shares
held by the Subscriber, if any.

 

12.
Listing. The Company will use commercially reasonable efforts to effect and maintain the listing of the Class A Common
Stock on the Nasdaq Capital Market (or another national securities exchange) during the term of this Agreement.

 

 

[Signature
Page Follows]

 

    13

     

    

 

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,
	 	 
	 	SILVERBOX
    ENGAGED MERGER CORP I
	 	 
	 	By:	/s/
    Stephen Kadenacy
	 	Name:  	Stephen
    Kadenacy
	 	Title:	Chief
    Executive Officer 

 

	Accepted
and agreed this 24th day of February, 2021.

	 
	ENGAGED
    CAPITAL, LLC
	 
	 By:	/s/
Glenn Welling	 
	Name:  	Glenn
Welling	 
	Title:	Managing
    Member	 

 

Signature
Page to Forward Purchase Agreement

 

     

     

    

 

EXHIBIT
A

 

SCHEDULE
OF SUBSCRIBERS

 

Date:
February 25, 2021

 

	Subscriber Name and Notice Address	 	Number
of Securities

(Shares of

 Class A

 Common Stock)
	 	 	Aggregate Purchase Price for Securities	 
	Engaged Capital, LLC 
610 Newport Center Drive, Suite 250 
Newport Beach, California 92660 
Attn: Glenn Welling 
Email: glenn@engagedcapital.com	 	 	10,000,000	 	 	$	100,000,000	 

 

    Exhibit A-1

     

    

 

EXHIBIT
B 

 

ASSIGNMENT
AND JOINDER TO FORWARD PURCHASE AGREEMENT

 

This
Assignment and Joinder Agreement (this “Agreement”) is entered into on [●] by and between Engaged Capital,
LLC, a Delaware limited liability company (“Assignor”), and [●], a [●] (“Assignee”).
Capitalized terms used but not herein defined will have the meanings given to them in the forward purchase agreement by and between
Assignor and SilverBox Engaged Merger Corp I, a Delaware corporation (the “Company”), dated [●], 2021
(as amended, the “Forward Purchase Agreement”).

 

RECITALS

 

WHEREAS,
Assignor is permitted to assign all or a portion of Assignor’s rights and obligations to purchase Securities to one or more
third parties by delivering to the Company an Assignment and Joinder Agreement executed by Assignor and such assignee with respect
to any such Securities; and

 

WHEREAS,
Assignor desires to assign and transfer its right to commit to purchase that number of Securities set forth in Item 2 on Schedule
A attached hereto to Assignee, and Assignee desires to accept such assignment and transfer and to irrevocably commit
to purchase that number of Securities pursuant to the terms of the Forward Purchase Agreement.

 

NOW,
THEREFORE, in consideration of the premises and the mutual covenants contained herein and other good and valuable consideration,
the receipt and sufficiency of which are hereby acknowledged, the parties hereto hereby agree as follows:

 

1. Assignment and
Assumption; Irrevocable Commitment to Purchase. Assignor hereby assigns and transfers to Assignee its right and obligation
to purchase that number of Securities set forth in Item 2 on Schedule A attached hereto, and Assignee hereby
accepts and assumes such assignment and transfer and further hereby irrevocably commits to purchase that number of Securities
pursuant to the terms of the Forward Purchase Agreement.

 

2. Joinder
to Forward Purchase Agreement. Assignee hereby joins as a party to the Forward Purchase Agreement in the capacity of a
Subscriber and agrees to be bound by, subject to and enjoy the benefit of the applicable rights and obligations of a Subscriber
set forth in the Forward Purchase Agreement with the same force and effect as if Assignee were an original party thereto. In addition,
Assignee hereby represents and warrants, as of the date hereof and as of the Closing, to the matters set forth in Section 2.1
of the Forward Purchase Agreement. Any notice or other communication to be given or made to Assignee under the Forward Purchase
Agreement may be given or made to the address, email address or facsimile number (if any) listed under Assignee’s name on
the signature page hereto or as Assignee may otherwise direct from time to time in accordance with the terms of the Forward Purchase
Agreement.

 

    Exhibit B-1

     

    

 

3. Successors
and Assigns. Neither this Agreement nor any right, interest or obligation hereunder may be assigned by any party hereto
without the prior written consent of the other parties, and any attempt to do so will be void, except for assignments and transfers
by operation of law. Subject to this Section 3, this Agreement is binding upon, inures to the benefit of and
is enforceable by the parties hereto and their respective successors and permitted assigns. The Company is hereby expressly made
a third-party beneficiary of this Agreement and is permitted to enforce the terms hereof.

 

4.
 Invalid Provisions. If any term or other provision of this Agreement is invalid, illegal,
or incapable of being enforced by any rule of law or public policy, all other conditions and provisions of this Agreement shall
nevertheless remain in full force and effect. Upon such determination that any term or other provision is invalid, illegal, or
incapable of being enforced, the parties hereto shall negotiate in good faith to modify this Agreement so as to effect the original
intent of the parties as closely as possible in an acceptable manner to the end that the transactions contemplated hereby are
fulfilled to the extent possible.

 

5.
 Governing Law. This Agreement shall be governed by and construed in accordance with
the Laws of the State of New York, without giving effect to any conflict or choice of law provision that would result in the imposition
of another state’s law.

 

6.  Counterparts;
Headings. This Agreement may be executed in any number of counterparts, each of which will be deemed an original, but
all of which together will constitute one and the same instrument. The headings contained herein are for reference purposes only
and shall not affect in any way the meaning or interpretation of this Agreement. Any facsimile or pdf copies hereof or signature
hereon shall, for all purposes, be deemed originals.

 

[Signature
Pages Follow]

 

    Exhibit B-2

     

    

 

IN
WITNESS WHEREOF, each party hereto has executed this Agreement as of the date first written above.

 

	 	ASSIGNOR:
	 	 
	 	ENGAGED CAPITAL, LLC
	 	 	 
	 	By:	 
	 	Name:	 
	 	Title:	 
	 	 	 
	 	ASSIGNEE:
	 	 	 
	 	[●]	 
	 	 	 
	 	By:	         
	 	Name:	 
	 	Title:	 

 

	 	Address for Notice:	[●]
	 	 	[●]
	 	 	Attn: [●]
	 	 	Email: [●]

 

	ACKNOWLEDGED AND AGREED:	 
	 	 
	SILVERBOX ENGAGED MERGER CORP I	 
	 	 	 
	By:	                 	 
	Name:	 	 
	Title:	 	 

 

    Exhibit B-3

     

    

 

SCHEDULE
A

SCHEDULE
OF ASSIGNED AND RETAINED SECURITIES

 

 

	1.	 	Number of Securities Assignor is entitled to purchase (prior to assignment):	 	 	 	 
	 	 	 	 	 	 	 
	2.	 	Number of Securities being assigned to Assignee and which Assignee irrevocably commits to purchase:	 	 	 	 
	 	 	 	 	 	 	 
	3.	 	Number of remaining Securities Assignor is entitled to purchase (after assignment):	 	 	 	 

 

 

Exhibit
B-4Exhibit 10.6

 

 

SILVERBOX ENGAGED MERGER CORP I

8801 Calera Dr.

Austin, TX 78735

 

February 25, 2021

SilverBox Engaged Sponsor LLC

8801 Calera Dr.

Austin, TX 78735

 

Re: Administrative
Support Agreement

 

Ladies and Gentlemen:

 

This letter agreement by
and between SilverBox Engaged Merger Corp I (the “Company”) and SilverBox Engaged Sponsor LLC (“Sponsor”),
dated as of the date hereof, will confirm our agreement that, commencing on the date the securities of the Company are first listed
on The Nasdaq Capital Market (the “Listing Date”), pursuant to a Registration Statement on Form S-1 and prospectus
filed with the U.S. Securities and Exchange Commission (the “Registration Statement”) and continuing until the earlier
of the consummation by the Company of an initial business combination or the Company’s liquidation (in each case as described
in the Registration Statement) (such earlier date hereinafter referred to as the “Termination Date”):

 

(i) Sponsor shall make
available, or cause to be made available, to the Company, at 8801 Calera Dr., Austin, TX 78735 (or any successor location
of Sponsor), certain office space, administrative and shared personnel support services as may be reasonably required by the Company.
In exchange therefor, the Company shall pay Sponsor the sum of $10,000 per month on the Listing Date and continuing monthly thereafter
until the Termination Date; and

 

(ii) Sponsor hereby irrevocably
waives any and all right, title, interest, causes of action and claims of any kind as a result of, or arising out of, this letter
agreement (each, a “Claim”) in or to, and any and all right to seek payment of any amounts due to it out of, the trust
account established for the benefit of the public stockholders of the Company and into which substantially all of the proceeds
of the Company’s initial public offering will be deposited (the “Trust Account”) as a result of, or arising out
of, this letter agreement, and hereby irrevocably waives any Claim it may have in the future, which Claim would reduce, encumber
or otherwise adversely affect the Trust Account or any monies or other assets in the Trust Account, and further agrees not to seek
recourse, reimbursement, payment or satisfaction of any Claim against the Trust Account or any monies or other assets in 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.

 

No party hereto may assign
either this letter agreement or any of its rights, interests, or obligations hereunder without the prior written approval 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.

 

This letter agreement constitutes
the entire relationship of the parties hereto, and any litigation between the parties (whether grounded in contract, tort, statute,
law or equity) 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 law principles.

 

[Signature Page Follows]

 

 

    

     

    

 

	 	Very truly yours,
	 	 
	 	SILVERBOX ENGAGED MERGER CORP I
	 	 	 
	 	By:	/s/ Stephen M. Kadenacy
	 	 	Name: Stephen M. Kadenacy
	 	 	Title: Chief Executive Officer 

 

AGREED TO AND ACCEPTED BY:

SILVERBOX ENGAGED SPONSOR LLC

 

	By:	/s/ Joseph Reece 	 
	 	Name: Joseph Reece 	 
	 	Title:   Authorized Signatory	 

  

 

 

 

 

[Signature Page to Administrative Support Agreement]

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