Document:

Exhibit 10.5

 

REGISTRATION RIGHTS AGREEMENT

 

THIS REGISTRATION RIGHTS AGREEMENT (this “Agreement”),
dated as of February 4, 2021, is made and entered into by and among Thunder Bridge Capital Partners III Inc., a Delaware corporation
(the “Company”), and TBCP III, LLC, a Delaware limited liability company (the “Sponsor,”
together with any person or entity who hereafter becomes a party to this Agreement pursuant to Section 5.2 of
this Agreement, the “Holders” and each, a “Holders”).

 

RECITALS

 

WHEREAS, the Company and the Sponsor
have entered into that certain Securities Subscription Agreement, dated as of June 12, 2020, pursuant to which the Sponsor
purchased an aggregate of 10,350,000 shares (the “Founder Shares”) of the Company’s
Class B common stock, par value $0.0001 per share, up to 1,350,000 of which would be forfeited to the Company for no consideration
depending on the extent to which the underwriters of the Company’s initial public offering exercise their over-allotment
option;

 

WHEREAS, the Founder Shares are convertible
into shares of the Company’s Class A common stock, par value $0.0001 per share (“Common Stock”),
on the terms and conditions provided in the Company’s amended and restated certificate of incorporation;

 

WHEREAS, on February 4, 2021, the Company
and the Sponsor entered into that certain Units Subscription Agreement, pursuant to which the Sponsor agreed to purchase 895,000
units (or up to 1,003,000 units if the over-allotment option in connection with the Company’s initial public offering is
exercised), each unit consisting of one share of Common Stock and one-fifth of one redeemable warrant to purchase one share of
Common Stock (the “Private Placement Units”), in a private placement
transaction occurring simultaneously with the closing of the Company’s initial public offering;

 

WHEREAS, in order to finance the Company’s
transaction costs in connection with an intended initial Business Combination (as defined below) the Sponsor or an affiliate of
the Sponsor or certain of the Company’s officers and directors may loan to the Company funds as the Company may require,
of which up to $1,500,000 of such loans may be convertible into units, each unit consisting of one share of Common Stock and one-fifth
of one redeemable warrant to purchase one share of Common Stock (“Working Capital Units”) at a price
of $10.00 per unit; and

 

WHEREAS, the Company and the Holders
desire to enter into this Agreement, pursuant to which the Company shall grant the Holders certain registration rights with respect
to certain securities of the Company, as set forth in this Agreement.

 

NOW, THEREFORE, in consideration
of the representations, covenants and agreements contained herein, and certain other good and valuable consideration, the receipt
and sufficiency of which are hereby acknowledged, the parties hereto, intending to be legally bound, hereby agree as follows:

 

ARTICLE I

DEFINITIONS

 

1.1 Definitions. The terms defined
in this Article I shall, for all purposes of this Agreement, have the respective meanings set forth below:

 

“Adverse Disclosure”
shall mean any public disclosure of material non-public information, which disclosure, in the good faith judgment of the Chief
Executive Officer or principal financial officer of the Company, after consultation with counsel to the Company, (i) would be required
to be made in any Registration Statement or Prospectus in order for the applicable Registration Statement or Prospectus not to
contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements contained therein
(in the case of any prospectus and any preliminary prospectus, in the light of the circumstances under which they were made) not
misleading, (ii) would not be required to be made at such time if the Registration Statement were not being filed, and (iii) the
Company has a bona fide business purpose for not making such information public.

 

     

     

    

 

“Agreement” shall
have the meaning given in the Preamble.

 

“Board” shall mean
the Board of Directors of the Company.

 

“Business Combination”
shall mean any merger, capital stock exchange, asset acquisition, stock purchase, reorganization or other similar business combination
with one or more businesses, involving the Company.

 

“Commission” shall
mean the Securities and Exchange Commission.

 

“Common Stock”
shall have the meaning given in the Recitals hereto.

 

“Company” shall have
the meaning given in the Preamble.

 

“Demand Registration”
shall have the meaning given in subsection 2.1.1.

 

“Demanding Holder”
shall have the meaning given in subsection 2.1.1.

 

“Exchange Act”
shall mean the Securities Exchange Act of 1934, as it may be amended from time to time.

 

“Form S-1” shall have
the meaning given in subsection 2.1.1.

 

“Form S-3” shall have
the meaning given in subsection 2.3.

 

“Founder Shares” shall
have the meaning given in the Recitals hereto and shall be deemed to include the shares of Common Stock issuable upon conversion
thereof.

 

“Founder Shares Lock-up Period”
shall mean, with respect to the Founder Shares, the period ending on the earlier of (A) one year after the completion of the Company’s
initial Business Combination and (B) subsequent to the Company’s initial Business Combination, (x) if the last reported sale
price of the Common Stock equals or exceeds $12.00 per share (as adjusted for stock splits, stock dividends, reorganizations, recapitalizations
and the like) for any 20 trading days within any 30-trading day period commencing at least 150 days after the Company’s initial
Business Combination or (y) the date on which the Company completes a liquidation, merger, capital stock exchange, reorganization
or other similar transaction that results in all of the Company’s stockholders having the right to exchange their shares
of Common Stock for cash, securities or other property.

 

“Holders” shall have
the meaning given in the Preamble.

 

“Insider Letter”
shall mean that certain letter agreement, dated the date hereof, by and among the Company, the Sponsor and each of the Company’s
officers, directors and director nominees.

  

“Maximum Number of Securities”
shall have the meaning given in subsection 2.1.4.

 

“Misstatement” shall
mean an untrue statement of a material fact or an omission to state a material fact required to be stated in a Registration Statement
or Prospectus, or necessary to make the statements in a Registration Statement or Prospectus (in the case of a Prospectus, in the
light of the circumstances under which they were made) not misleading.

 

“Permitted Transferees”
shall mean any person or entity to whom a Holder of Registrable Securities is permitted to transfer such Registrable Securities
prior to the expiration of the Founder Shares Lock-up Period or Private Placement Lock-up Period, as the case may be, under the
Insider Letter, this Agreement and any other applicable agreement between such Holder and the Company, and to any transferee thereafter.

 

“Piggyback Registration”
shall have the meaning given in subsection 2.2.1.

 

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“Private Placement Lock-up Period”
shall mean, with respect to Private Placement Units that are held by the initial purchasers of such Private Placement Units or
their Permitted Transferees, and any of the securities underlying the Private Placement Units, including the Private Placement
Shares, the Private Placement Warrants and the Common Stock issued or issuable upon the exercise of the Private Placement Warrants,
that are held by the initial purchasers of the Private Placement Units or their Permitted Transferees, the period ending 30 days
after the completion of the Company’s initial Business Combination.

 

“Private Placement Shares”
shall mean the shares of Common Stock comprising the Private Placement Units. 

 

“Private Placement Units”
shall have the meaning given in the Recitals hereto. 

 

“Private Placement Warrants”
shall mean the warrants comprising the Private Placement Units. 

 

“Pro Rata” shall have
the meaning given in subsection 2.1.4.

 

“Prospectus” shall
mean the prospectus included in any Registration Statement, as supplemented by any and all prospectus supplements and as amended
by any and all post-effective amendments and including all material incorporated by reference in such prospectus.

 

“Registrable Security”
shall mean (a) the shares of Common Stock issued or issuable upon the conversion of any Founder Shares, (b) the Private Placement
Units (including the Private Placement Shares, the Private Placement Warrants and the Common Stock issued or issuable upon the
exercise of the Private Placement Warrants), (c) any outstanding share of the Common Stock or any other equity security (including
the shares of Common Stock issued or issuable upon the exercise of any other equity security) of the Company held by a Holder as
of the date of this Agreement, (d) any Working Capital Units (including its underlying securities and shares of Common Stock issued
or issuable upon the exercise of such underlying securities), and (e) any other equity security of the Company issued or issuable
with respect to any such share of the Common Stock by way of a stock dividend or stock split or in connection with a combination
of shares, recapitalization, merger, consolidation or reorganization; provided, however, that, as to any
particular Registrable Security, such securities shall cease to be Registrable Securities when: (A) a Registration Statement with
respect to the sale of such securities shall have become effective under the Securities Act and such securities shall have been
sold, transferred, disposed of or exchanged in accordance with such Registration Statement; (B) such securities shall have been
otherwise transferred, new certificates for such securities not bearing a legend restricting further transfer shall have been delivered
by the Company and subsequent public distribution of such securities shall not require registration under the Securities Act; (C)
such securities shall have ceased to be outstanding; (D) such securities may be sold without registration pursuant to Rule 144
promulgated under the Securities Act (or any successor rule promulgated thereafter by the Commission) (but with no volume or other
restrictions or limitations); or (E) such securities have been sold to, or through, a broker, dealer or underwriter in a public
distribution or other public securities transaction.

  

“Registration” shall
mean a registration effected by preparing and filing a registration statement or similar document in compliance with the requirements
of the Securities Act, and the applicable rules and regulations promulgated thereunder, and such registration statement becoming
effective.

 

“Registration Expenses”
shall mean the out-of-pocket expenses of a Registration, including, without limitation, the following:

 

(A) all registration and filing fees (including
fees with respect to filings required to be made with the Financial Industry Regulatory Authority, Inc.) and any securities exchange
on which the Common Stock is then listed;

 

(B) fees and expenses of compliance with securities
or blue sky laws (including reasonable fees and disbursements of counsel for the Underwriters in connection with blue sky qualifications
of Registrable Securities);

 

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(C) printing, messenger, telephone and delivery
expenses;

 

(D) reasonable fees and disbursements of counsel
for the Company;

 

(E) reasonable fees and disbursements of all
independent registered public accountants of the Company incurred specifically in connection with such Registration; and

 

(F) reasonable fees and expenses of one (1)
legal counsel selected by the majority-in-interest of the Demanding Holders initiating a Demand Registration to be registered for
offer and sale in the applicable Registration.

 

“Registration Statement”
shall mean any registration statement that covers the Registrable Securities pursuant to the provisions of this Agreement, including
the Prospectus included in such registration statement, amendments (including post-effective amendments) and supplements to such
registration statement, and all exhibits to and all material incorporated by reference in such registration statement.

 

“Requesting Holder”
shall have the meaning given in subsection 2.1.1.

 

“Securities Act”
shall mean the Securities Act of 1933, as amended from time to time.

 

“Sponsor” shall have
the meaning given in the Recitals hereto.

 

“Underwriter” shall
mean a securities dealer who purchases any Registrable Securities as principal in an Underwritten Offering and not as part of such
dealer’s market-making activities.

 

“Underwritten Registration”
or “Underwritten Offering” shall mean a Registration in which securities of the Company
are sold to an Underwriter in a firm commitment underwriting for distribution to the public.

 

“Working Capital Units”
shall have the meaning given in the Recitals hereto.

 

ARTICLE II

REGISTRATIONS

 

2.1 Demand Registration.

 

2.1.1 Request for Registration.
Subject to the provisions of subsection 2.1.4 and Section 2.4 hereof, at any time and from time to time on or
after the date the Company consummates the Business Combination, the Holders of at least a majority in interest of the then-outstanding
number of Registrable Securities (the “Demanding Holders”) may make a written demand
for Registration of all or part of their Registrable Securities, which written demand shall describe the amount and type of securities
to be included in such Registration and the intended method(s) of distribution thereof (such written demand a “Demand Registration”).
The Company shall, within ten (10) days of the Company’s receipt of the Demand Registration, notify, in writing, all other
Holders of Registrable Securities of such demand, and each Holder of Registrable Securities who thereafter wishes to include all
or a portion of such Holder’s Registrable Securities in a Registration pursuant to a Demand Registration (each such Holder
that includes all or a portion of such Holder’s Registrable Securities in such Registration, a “Requesting Holder”)
shall so notify the Company, in writing, within five (5) days after the receipt by the Holder of the notice from the Company. Upon
receipt by the Company of any such written notification from a Requesting Holder(s) to the Company, such Requesting Holder(s) shall
be entitled to have their Registrable Securities included in a Registration pursuant to a Demand Registration and the Company shall
effect, as soon thereafter as practicable, but not more than forty five (45) days immediately after the Company’s receipt
of the Demand Registration, the Registration of all Registrable Securities requested by the Demanding Holders and Requesting Holders
pursuant to such Demand Registration. Under no circumstances shall the Company be obligated to effect more than an aggregate of
three (3) Registrations pursuant to a Demand Registration under this subsection 2.1.1 with respect to any or all
Registrable Securities; provided, however, that a Registration shall not be counted for such purposes unless
a Form S-1 or any similar long-form registration statement that may be available at such time (“Form S-1”) has become
effective and all of the Registrable Securities requested by the Requesting Holders to be registered on behalf of the Requesting
Holders in such Form S-1 Registration have been sold, in accordance with Section 3.1 of this Agreement.

 

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2.1.2 Effective Registration.
Notwithstanding the provisions of subsection 2.1.1 above or any other part of this Agreement, a Registration pursuant
to a Demand Registration shall not count as a Registration unless and until (i) the Registration Statement filed with the Commission
with respect to a Registration pursuant to a Demand Registration has been declared effective by the Commission and (ii) the Company
has complied with all of its obligations under this Agreement with respect thereto; provided, further,
that if, after such Registration Statement has been declared effective, an offering of Registrable Securities in a Registration
pursuant to a Demand Registration is subsequently interfered with by any stop order or injunction of the Commission, federal or
state court or any other governmental agency the Registration Statement with respect to such Registration shall be deemed not to
have been declared effective, unless and until, (i) such stop order or injunction is removed, rescinded or otherwise terminated,
and (ii) a majority-in-interest of the Demanding Holders initiating such Demand Registration thereafter affirmatively elect to
continue with such Registration and accordingly notify the Company in writing, but in no event later than five (5) days, of such
election; and provided, further, that the Company shall not be obligated or required to file another Registration
Statement until the Registration Statement that has been previously filed with respect to a Registration pursuant to a Demand Registration
becomes effective or is subsequently terminated.

 

2.1.3 Underwritten Offering. Subject
to the provisions of subsection 2.1.4 and Section 2.4 hereof, if a majority-in-interest of the
Demanding Holders so advise the Company as part of their Demand Registration that the offering of the Registrable Securities pursuant
to such Demand Registration shall be in the form of an Underwritten Offering, then the right of such Demanding Holder or Requesting
Holder (if any) to include its Registrable Securities in such Registration shall be conditioned upon such Holder’s participation
in such Underwritten Offering and the inclusion of such Holder’s Registrable Securities in such Underwritten Offering to
the extent provided herein. All such Holders proposing to distribute their Registrable Securities through an Underwritten Offering
under this subsection 2.1.3 shall enter into an underwriting agreement in customary form with the Underwriter(s)
selected for such Underwritten Offering by the majority-in-interest of the Demanding Holders initiating the Demand Registration.

  

2.1.4 Reduction of Underwritten Offering.
If the managing Underwriter or Underwriters in an Underwritten Registration pursuant to a Demand Registration, in good faith, advises
the Company, the Demanding Holders and the Requesting Holders (if any) in writing that the dollar amount or number of Registrable
Securities that the Demanding Holders and the Requesting Holders (if any) desire to sell, taken together with all other shares
of Common Stock or other equity securities that the Company desires to sell and the shares of Common Stock, if any, as to which
a Registration has been requested pursuant to separate written contractual piggy-back registration rights held by any other stockholders
who desire to sell, exceeds the maximum dollar amount or maximum number of equity securities that can be sold in the Underwritten
Offering without adversely affecting the proposed offering price, the timing, the distribution method, or the probability of success
of such offering (such maximum dollar amount or maximum number of such securities, as applicable, the “Maximum Number of Securities”),
then the Company shall include in such Underwritten Offering, as follows: (i) first, the Registrable Securities of the Demanding
Holders and the Requesting Holders (if any) (pro rata based on the respective number of Registrable Securities that each Demanding
Holder and Requesting Holder (if any) has requested be included in such Underwritten Registration and the aggregate number of Registrable
Securities that the Demanding Holders and Requesting Holders have requested be included in such Underwritten Registration (such
proportion is referred to herein as “Pro Rata”)) that can be sold without exceeding
the Maximum Number of Securities; (ii) second, to the extent that the Maximum Number of Securities has not been reached under the
foregoing clause (i), the Registrable Securities of Holders (Pro Rata, based on the respective number of Registrable Securities
that each Holder has so requested) exercising their rights to register their Registrable Securities pursuant to subsection
2.2.1 hereof, without exceeding the Maximum Number of Securities; and (iii) third, to the extent that the Maximum Number
of Securities has not been reached under the foregoing clauses (i) and (ii), the shares of Common Stock or other equity securities
that the Company desires to sell, which can be sold without exceeding the Maximum Number of Securities; and (iv) fourth, to the
extent that the Maximum Number of Securities has not been reached under the foregoing clauses (i), (ii) and (iii), the shares of
Common Stock or other equity securities of other persons or entities that the Company is obligated to register in a Registration
pursuant to separate written contractual arrangements with such persons and that can be sold without exceeding the Maximum Number
of Securities.

 

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2.1.5 Demand Registration Withdrawal.
A majority-in-interest of the Demanding Holders initiating a Demand Registration or a majority-in-interest of the Requesting Holders
(if any), pursuant to a Registration under subsection 2.1.1 shall have the right to withdraw from a Registration
pursuant to such Demand Registration for any or no reason whatsoever upon written notification to the Company and the Underwriter
or Underwriters (if any) of their intention to withdraw from such Registration prior to the effectiveness of the Registration Statement
filed with the Commission with respect to the Registration of their Registrable Securities pursuant to such Demand Registration.
Notwithstanding anything to the contrary in this Agreement, the Company shall be responsible for the Registration Expenses incurred
in connection with a Registration pursuant to a Demand Registration prior to its withdrawal under this subsection 2.1.5.

 

2.2 Piggyback Registration.

 

2.2.1 Piggyback Rights. If, at
any time on or after the date the Company consummates a Business Combination, the Company proposes to file a Registration Statement
under the Securities Act with respect to an offering of equity securities, or securities or other obligations exercisable or exchangeable
for, or convertible into equity securities, for its own account or for the account of stockholders of the Company (or by the Company
and by the stockholders of the Company including, without limitation, pursuant to Section 2.1 hereof), other than
a Registration Statement (i) filed in connection with any employee stock option or other benefit plan, (ii) for an exchange offer
or offering of securities solely to the Company’s existing stockholders, (iii) for an offering of debt that is convertible
into equity securities of the Company or (iv) for a dividend reinvestment plan, then the Company shall give written notice of such
proposed filing to all of the Holders of Registrable Securities as soon as practicable but not less than ten (10) days before the
anticipated filing date of such Registration Statement, which notice shall (A) describe the amount and type of securities to be
included in such offering, the intended method(s) of distribution, and the name of the proposed managing Underwriter or Underwriters,
if any, in such offering, and (B) offer to all of the Holders of Registrable Securities the opportunity to register the sale of
such number of Registrable Securities as such Holders may request in writing within five (5) days after receipt of such written
notice (such Registration a “Piggyback Registration”). The Company shall, in good
faith, cause such Registrable Securities to be included in such Piggyback Registration and shall use its best efforts to cause
the managing Underwriter or Underwriters of a proposed Underwritten Offering to permit the Registrable Securities requested by
the Holders pursuant to this subsection 2.2.1 to be included in a Piggyback Registration on the same terms and
conditions as any similar securities of the Company included in such Registration and to permit the sale or other disposition of
such Registrable Securities in accordance with the intended method(s) of distribution thereof. All such Holders proposing to distribute
their Registrable Securities through an Underwritten Offering under this subsection 2.2.1 shall enter into an
underwriting agreement in customary form with the Underwriter(s) selected for such Underwritten Offering by the Company.

  

2.2.2 Reduction of Piggyback Registration.
If the managing Underwriter or Underwriters in an Underwritten Registration that is to be a Piggyback Registration, in good faith,
advises the Company and the Holders of Registrable Securities participating in the Piggyback Registration in writing that the dollar
amount or number of the shares of Common Stock that the Company desires to sell, taken together with (i) the shares of Common Stock,
if any, as to which Registration has been demanded pursuant to separate written contractual arrangements with persons or entities
other than the Holders of Registrable Securities hereunder (ii) the Registrable Securities as to which registration has been requested
pursuant to Section 2.2 hereof, and (iii) the shares of Common Stock, if any, as to which Registration has been
requested pursuant to separate written contractual piggy-back registration rights of other stockholders of the Company, exceeds
the Maximum Number of Securities, then:

 

(a) If the Registration is undertaken for
the Company’s account, the Company shall include in any such Registration (A) first, the shares of Common Stock or other
equity securities that the Company desires to sell, which can be sold without exceeding the Maximum Number of Securities; (B) second,
to the extent that the Maximum Number of Securities has not been reached under the foregoing clause (A), the Registrable Securities
of Holders exercising their rights to register their Registrable Securities pursuant to subsection 2.2.1 hereof,
Pro Rata, which can be sold without exceeding the Maximum Number of Securities; and (C) third, to the extent that the Maximum Number
of Securities has not been reached under the foregoing clauses (A) and (B), the shares of Common Stock, if any, as to which Registration
has been requested pursuant to written contractual piggy-back registration rights of other stockholders of the Company, which can
be sold without exceeding the Maximum Number of Securities;

 

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(b) If the Registration is pursuant to a request
by persons or entities other than the Holders of Registrable Securities, then the Company shall include in any such Registration
(A) first, the shares of Common Stock or other equity securities, if any, of such requesting persons or entities, other than the
Holders of Registrable Securities, which can be sold without exceeding the Maximum Number of Securities; (B) second, to the extent
that the Maximum Number of Securities has not been reached under the foregoing clause (A), the Registrable Securities of Holders
exercising their rights to register their Registrable Securities pursuant to subsection 2.2.1, pro rata based on the
respective number of Registrable Securities that each Holder has requested be included in such Underwritten Registration and the
aggregate number of Registrable Securities that the Holders have requested to be included in such Underwritten Registration, which
can be sold without exceeding the Maximum Number of Securities; (C) third, to the extent that the Maximum Number of Securities
has not been reached under the foregoing clauses (A) and (B), the shares of Common Stock or other equity securities that the Company
desires to sell, which can be sold without exceeding the Maximum Number of Securities; and (D) fourth, to the extent that the Maximum
Number of Securities has not been reached under the foregoing clauses (A), (B) and (C), the shares of Common Stock or other equity
securities for the account of other persons or entities that the Company is obligated to register pursuant to separate written
contractual arrangements with such persons or entities, which can be sold without exceeding the Maximum Number of Securities.

 

2.2.3 Piggyback Registration Withdrawal.
Any Holder of Registrable Securities shall have the right to withdraw from a Piggyback Registration for any or no reason whatsoever
upon written notification to the Company and the Underwriter or Underwriters (if any) of his, her or its intention to withdraw
from such Piggyback Registration prior to the effectiveness of the Registration Statement filed with the Commission with respect
to such Piggyback Registration (or in the case of an Underwritten Registration pursuant to Rule 415 under the Securities Act, at
least two business days prior to the time of pricing of the applicable offering). The Company (whether on its own good faith determination
or as the result of a request for withdrawal by persons pursuant to separate written contractual obligations) may withdraw a Registration
Statement filed with the Commission in connection with a Piggyback Registration at any time prior to the effectiveness of such
Registration Statement. Notwithstanding anything to the contrary in this Agreement, the Company shall be responsible for the Registration
Expenses incurred in connection with the Piggyback Registration prior to its withdrawal under this subsection 2.2.3.

  

2.2.4 Unlimited Piggyback Registration
Rights. For purposes of clarity, any Registration effected pursuant to Section 2.2 hereof shall not be counted
as a Registration pursuant to a Demand Registration effected under Section 2.1 hereof.

 

2.3 Registrations on Form S-3. Any
Holder of Registrable Securities may at any time, and from time to time, request in writing that the Company, pursuant to Rule
415 under the Securities Act (or any successor rule promulgated thereafter by the Commission), register the resale of any or all
of their Registrable Securities on Form S-3 or any similar short form registration statement that may be available at such time
(“Form S-3”); provided, however, that the Company shall not be obligated to effect
such request through an Underwritten Offering. Within five (5) days of the Company’s receipt of a written request from a
Holder or Holders of Registrable Securities for a Registration on Form S-3, the Company shall promptly give written notice of the
proposed Registration on Form S-3 to all other Holders of Registrable Securities, and each Holder of Registrable Securities who
thereafter wishes to include all or a portion of such Holder’s Registrable Securities in such Registration on Form S-3 shall
so notify the Company, in writing, within ten (10) days after the receipt by the Holder of the notice from the Company. As soon
as practicable thereafter, but not more than twelve (12) days after the Company’s initial receipt of such written request
for a Registration on Form S-3, the Company shall register all or such portion of such Holder’s Registrable Securities as
are specified in such written request, together with all or such portion of Registrable Securities of any other Holder or Holders
joining in such request as are specified in the written notification given by such Holder or Holders; provided, however,
that the Company shall not be obligated to effect any such Registration pursuant to Section 2.3 hereof if (i)
a Form S-3 is not available for such offering; or (ii) the Holders of Registrable Securities, together with the Holders of any
other equity securities of the Company entitled to inclusion in such Registration, propose to sell the Registrable Securities and
such other equity securities (if any) at any aggregate price to the public of less than $10,000,000.

 

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2.4 Restrictions on Registration Rights.
If (A) during the period starting with the date sixty (60) days prior to the Company’s good faith estimate of the date of
the filing of, and ending on a date one hundred and twenty (120) days after the effective date of, a Company initiated Registration
and provided that the Company has delivered written notice to the Holders prior to receipt of a Demand Registration pursuant to subsection
2.1.1 and it continues to actively employ, in good faith, all reasonable efforts to cause the applicable Registration
Statement to become effective; (B) the Holders have requested an Underwritten Registration and the Company and the Holders are
unable to obtain the commitment of underwriters to firmly underwrite the offer; or (C) in the good faith judgment of the Board
such Registration would be seriously detrimental to the Company and the Board concludes as a result that it is essential to defer
the filing of such Registration Statement at such time, then in each case the Company shall furnish to such Holders a certificate
signed by the Chairman of the Board stating that in the good faith judgment of the Board it would be seriously detrimental to the
Company for such Registration Statement to be filed in the near future and that it is therefore essential to defer the filing of
such Registration Statement. In such event, the Company shall have the right to defer such filing for a period of not more than
thirty (30) days; provided, however, that the Company shall not defer its obligation in this manner more
than once in any 12-month period.

  

ARTICLE III

COMPANY PROCEDURES

 

3.1 General Procedures. If at any
time on or after the date the Company consummates a Business Combination the Company is required to effect the Registration of
Registrable Securities, the Company shall use its best efforts to effect such Registration to permit the sale of such Registrable
Securities in accordance with the intended plan of distribution thereof, and pursuant thereto the Company shall, as expeditiously
as possible:

 

3.1.1 prepare and file with the Commission
as soon as practicable a Registration Statement with respect to such Registrable Securities and use its reasonable best efforts
to cause such Registration Statement to become effective and remain effective until all Registrable Securities covered by such
Registration Statement have been sold;

 

3.1.2 prepare and file with the Commission
such amendments and post-effective amendments to the Registration Statement, and such supplements to the Prospectus, as may be
requested by any Holder or any Underwriter of Registrable Securities or as may be required by the rules, regulations or instructions
applicable to the registration form used by the Company or by the Securities Act or rules and regulations thereunder to keep the
Registration Statement effective until all Registrable Securities covered by such Registration Statement are sold in accordance
with the intended plan of distribution set forth in such Registration Statement or supplement to the Prospectus;

 

3.1.3 prior to filing a Registration Statement
or Prospectus, or any amendment or supplement thereto, furnish without charge to the Underwriters, if any, and each Holder of Registrable
Securities included in such Registration, and each such Holder’s legal counsel, copies of such Registration Statement as
proposed to be filed, each amendment and supplement to such Registration Statement (in each case including all exhibits thereto
and documents incorporated by reference therein), the Prospectus included in such Registration Statement (including each preliminary
Prospectus), and such other documents as the Underwriters and each Holder of Registrable Securities included in such Registration
or the legal counsel for any such Holders may request in order to facilitate the disposition of the Registrable Securities owned
by such Holders;

 

3.1.4 prior to any public offering of Registrable
Securities, use its best efforts to (i) register or qualify the Registrable Securities covered by the Registration Statement under
such securities or “blue sky” laws of such jurisdictions in the United States as any Holder of Registrable Securities
included in such Registration Statement (in light of their intended plan of distribution) may request and (ii) take such action
necessary to cause such Registrable Securities covered by the Registration Statement to be registered with or approved by such
other governmental authorities as may be necessary by virtue of the business and operations of the Company and do any and all other
acts and things that may be necessary or advisable to enable the Holders of Registrable Securities included in such Registration
Statement to consummate the disposition of such Registrable Securities in such jurisdictions; provided, however,
that the Company shall not be required to qualify generally to do business in any jurisdiction where it would not otherwise be
required to qualify or take any action to which it would be subject to general service of process or taxation in any such jurisdiction
where it is not then otherwise so subject;

 

    8

     

    

 

3.1.5 cause all such Registrable Securities
to be listed on each securities exchange or automated quotation system on which similar securities issued by the Company are then
listed;

 

3.1.6 provide a transfer agent or warrant
agent, as applicable, and registrar for all such Registrable Securities no later than the effective date of such Registration Statement;

 

3.1.7 advise each seller of such Registrable
Securities, promptly after it shall receive notice or obtain knowledge thereof, of the issuance of any stop order by the Commission
suspending the effectiveness of such Registration Statement or the initiation or threatening of any proceeding for such purpose
and promptly use its reasonable best efforts to prevent the issuance of any stop order or to obtain its withdrawal if such stop
order should be issued;

 

3.1.8 at least five (5) days prior to the
filing of any Registration Statement or Prospectus or any amendment or supplement to such Registration Statement or Prospectus
or any document that is to be incorporated by reference into such Registration Statement or Prospectus, furnish a copy thereof
to each seller of such Registrable Securities and its counsel, including, without limitation, providing copies promptly upon receipt
of any comment letters received with respect to any such Registration Statement or Prospectus;

 

3.1.9 notify the Holders at any time when
a Prospectus relating to such Registration Statement is required to be delivered under the Securities Act, of the happening of
any event as a result of which the Prospectus included in such Registration Statement, as then in effect, includes a Misstatement,
and then to correct such Misstatement as set forth in Section 3.4 hereof;

 

3.1.10 permit a representative of the Holders
(such representative to be selected by a majority of the participating Holders), the Underwriters, if any, and any attorney or
accountant retained by such Holders, or Underwriter to participate, at each such person’s own expense, in the preparation
of the Registration Statement, and cause the Company’s officers, directors and employees to supply all information reasonably
requested by any such representative, Underwriter, attorney or accountant in connection with the Registration; provided, however,
that such representatives, or Underwriters enter into a confidentiality agreement, in form and substance reasonably satisfactory
to the Company, prior to the release or disclosure of any such information; and provided further, the Company
may not include the name of any Holder or Underwriter or any information regarding any Holder or Underwriter in any Registration
Statement or Prospectus, any amendment or supplement to such Registration Statement or Prospectus, any document that is to be incorporated
by reference into such Registration Statement or Prospectus, or any response to any comment letter, without the prior written consent
of such Holder or Underwriter and providing each such Holder or Underwriter a reasonable amount of time to review and comment on
such applicable document, which comments the Company shall include unless contrary to applicable law;

 

3.1.11 obtain a “cold comfort”
letter from the Company’s independent registered public accountants in the event of an Underwritten Registration which the
participating Holders may rely on, in customary form and covering such matters of the type customarily covered by “cold comfort”
letters as the managing Underwriter may reasonably request, and reasonably satisfactory to a majority-in-interest of the participating
Holders;

 

3.1.12 on the date the Registrable Securities
are delivered for sale pursuant to such Registration, obtain an opinion, dated such date, of counsel representing the Company for
the purposes of such Registration, addressed to the Holders, the placement agent or sales agent, if any, and the Underwriters,
if any, covering such legal matters with respect to the Registration in respect of which such opinion is being given as the Holders,
placement agent, sales agent, or Underwriter may reasonably request and as are customarily included in such opinions and negative
assurance letters, and reasonably satisfactory to a majority in interest of the participating Holders;

 

3.1.13 in the event of any Underwritten Offering,
enter into and perform its obligations under an underwriting agreement, in usual and customary form, with the managing Underwriter
of such offering;

 

    9

     

    

 

3.1.14 make available to its security holders,
as soon as reasonably practicable, an earnings statement covering the period of at least twelve (12) months beginning with the
first day of the Company’s first full calendar quarter after the effective date of the Registration Statement which satisfies
the provisions of Section 11(a) of the Securities Act and Rule 158 thereunder (or any successor rule promulgated
thereafter by the Commission);

 

3.1.15 if the Registration involves the Registration
of Registrable Securities involving gross proceeds in excess of $50,000,000, use its reasonable efforts to make available senior
executives of the Company to participate in customary “road show” presentations that may be reasonably requested by
the Underwriter in any Underwritten Offering; and

 

3.1.16 otherwise, in good faith, cooperate
reasonably with, and take such customary actions as may reasonably be requested by the Holders, in connection with such Registration.

 

3.2 Registration Expenses. The Registration
Expenses of all Registrations shall be borne by the Company. It is acknowledged by the Holders that the Holders shall bear all
incremental selling expenses relating to the sale of Registrable Securities, such as Underwriters’ commissions and discounts,
brokerage fees, Underwriter marketing costs and, other than as set forth in the definition of “Registration Expenses,”
all reasonable fees and expenses of any legal counsel representing the Holders.

 

3.3 Requirements for Participation in
Underwritten Offerings. No person may participate in any Underwritten Offering for equity securities of the Company pursuant
to a Registration initiated by the Company hereunder unless such person (i) agrees to sell such person’s securities on the
basis provided in any underwriting arrangements approved by the Company and (ii) completes and executes all customary questionnaires,
powers of attorney, indemnities, lock-up agreements, underwriting agreements and other customary documents as may be reasonably
required under the terms of such underwriting arrangements.

 

3.4 Suspension of Sales; Adverse Disclosure.
Upon receipt of written notice from the Company that a Registration Statement or Prospectus contains a Misstatement, each of the
Holders shall forthwith discontinue disposition of Registrable Securities until it has received copies of a supplemented or amended
Prospectus correcting the Misstatement (it being understood that the Company hereby covenants to prepare and file such supplement
or amendment as soon as practicable after the time of such notice), or until it is advised in writing by the Company that the use
of the Prospectus may be resumed. If the filing, initial effectiveness or continued use of a Registration Statement in respect
of any Registration at any time would require the Company to make an Adverse Disclosure or would require the inclusion in such
Registration Statement of financial statements that are unavailable to the Company for reasons beyond the Company’s control,
the Company may, upon giving prompt written notice of such action to the Holders, delay the filing or initial effectiveness of,
or suspend use of, such Registration Statement for the shortest period of time, but in no event more than thirty (30) days, determined
in good faith by the Company to be necessary for such purpose. In the event the Company exercises its rights under the preceding
sentence, the Holders agree to suspend, immediately upon their receipt of the notice referred to above, their use of the Prospectus
relating to any Registration in connection with any sale or offer to sell Registrable Securities. The Company shall immediately
notify the Holders of the expiration of any period during which it exercised its rights under this Section 3.4.

 

3.5 Reporting Obligations. As long
as any Holder shall own Registrable Securities, the Company, at all times while it shall be a reporting company under the Exchange
Act, covenants to file timely (or obtain extensions in respect thereof and file within the applicable grace period) all reports
required to be filed by the Company after the date hereof pursuant to Sections 13(a) or 15(d) of
the Exchange Act and to promptly furnish the Holders with true and complete copies of all such filings. The Company further covenants
that it shall take such further action as any Holder may reasonably request, all to the extent required from time to time to enable
such Holder to sell shares of the Common Stock held by such Holder without registration under the Securities Act within the limitation
of the exemptions provided by Rule 144 promulgated under the Securities Act (or any successor rule promulgated thereafter by the
Commission), including providing any legal opinions. Upon the request of any Holder, the Company shall deliver to such Holder a
written certification of a duly authorized officer as to whether it has complied with such requirements.

 

    10

     

    

 

ARTICLE IV

INDEMNIFICATION AND CONTRIBUTION

 

4.1 Indemnification.

 

4.1.1 The Company agrees to indemnify, to
the extent permitted by law, each Holder of Registrable Securities, its officers and directors and agents and each person who controls
such Holder (within the meaning of the Securities Act) against all losses, claims, damages, liabilities and expenses (including
attorneys’ fees) caused by any untrue or alleged untrue statement of material fact contained in any Registration Statement,
Prospectus or preliminary Prospectus or any amendment thereof or supplement thereto or any omission or alleged omission of a material
fact required to be stated therein or necessary to make the statements therein not misleading, except insofar as the same are caused
by or contained in any information furnished in writing to the Company by such Holder expressly for use therein. The Company shall
indemnify the Underwriters, their officers and directors and each person who controls such Underwriters (within the meaning of
the Securities Act) to the same extent as provided in the foregoing with respect to the indemnification of the Holder.

 

4.1.2 In connection with any Registration
Statement in which a Holder of Registrable Securities is participating, such Holder shall furnish to the Company in writing such
information and affidavits as the Company reasonably requests for use in connection with any such Registration Statement or Prospectus
and, to the extent permitted by law, shall indemnify the Company, its directors and officers and agents and each person who controls
the Company (within the meaning of the Securities Act) against any losses, claims, damages, liabilities and expenses (including
without limitation reasonable attorneys’ fees) resulting from any untrue or alleged untrue statement of material fact contained
in the Registration Statement, Prospectus or preliminary Prospectus or any amendment thereof or supplement thereto or any omission
or alleged omission of a material fact required to be stated therein or necessary to make the statements therein not misleading,
but only to the extent that such untrue statement or omission is contained in any information or affidavit so furnished in writing
by such Holder expressly for use therein; provided, however, that the obligation to indemnify shall be
several, not joint and several, among such Holders of Registrable Securities, and the liability of each such Holder of Registrable
Securities shall be in proportion to and limited to the net proceeds received by such Holder from the sale of Registrable Securities
pursuant to such Registration Statement. The Holders of Registrable Securities shall indemnify the Underwriters, their officers,
directors and each person who controls such Underwriters (within the meaning of the Securities Act) to the same extent as provided
in the foregoing with respect to indemnification of the Company.

 

4.1.3 Any person entitled to indemnification
herein shall (i) give prompt written notice to the indemnifying party of any claim with respect to which it seeks indemnification
(provided that the failure to give prompt notice shall not impair any person’s right to indemnification hereunder to the
extent such failure has not materially prejudiced the indemnifying party) and (ii) unless in such indemnified party’s reasonable
judgment a conflict of interest between such indemnified and indemnifying parties may exist with respect to such claim, permit
such indemnifying party to assume the defense of such claim with counsel reasonably satisfactory to the indemnified party. If such
defense is assumed, the indemnifying party shall not be subject to any liability for any settlement made by the indemnified party
without its consent (but such consent shall not be unreasonably withheld). An indemnifying party who is not entitled to, or elects
not to, assume the defense of a claim shall not be obligated to pay the fees and expenses of more than one counsel (plus local
counsel) for all parties indemnified by such indemnifying party with respect to such claim, unless in the reasonable judgment of
any indemnified party a conflict of interest may exist between such indemnified party and any other of such indemnified parties
with respect to such claim. No indemnifying party shall, without the consent of the indemnified party, consent to the entry of
any judgment or enter into any settlement which cannot be settled in all respects by the payment of money (and such money is so
paid by the indemnifying party pursuant to the terms of such settlement) or which settlement does not include as an unconditional
term thereof the giving by the claimant or plaintiff to such indemnified party of a release from all liability in respect to such
claim or litigation.

 

4.1.4 The indemnification provided for under
this Agreement shall remain in full force and effect regardless of any investigation made by or on behalf of the indemnified party
or any officer, director or controlling person of such indemnified party and shall survive the transfer of securities. The Company
and each Holder of Registrable Securities participating in an offering also agrees to make such provisions as are reasonably requested
by any indemnified party for contribution to such party in the event the Company’s or such Holder’s indemnification
is unavailable for any reason.

  

    11

     

    

 

4.1.5 If the indemnification provided under Section
4.1 hereof from the indemnifying party is unavailable or insufficient to hold harmless an indemnified party in respect
of any losses, claims, damages, liabilities and expenses referred to herein, then the indemnifying party, in lieu of indemnifying
the indemnified party, shall contribute to the amount paid or payable by the indemnified party as a result of such losses, claims,
damages, liabilities and expenses in such proportion as is appropriate to reflect the relative fault of the indemnifying party
and the indemnified party, as well as any other relevant equitable considerations. The relative fault of the indemnifying party
and indemnified party shall be determined by reference to, among other things, whether any action in question, including any untrue
or alleged untrue statement of a material fact or omission or alleged omission to state a material fact, was made by, or relates
to information supplied by, such indemnifying party or indemnified party, and the indemnifying party’s and indemnified party’s
relative intent, knowledge, access to information and opportunity to correct or prevent such action; provided, however,
that the liability of any Holder under this subsection 4.1.5 shall be limited to the amount of the net proceeds
received by such Holder in such offering giving rise to such liability. The amount paid or payable by a party as a result of the
losses or other liabilities referred to above shall be deemed to include, subject to the limitations set forth in subsections
4.1.1, 4.1.2 and 4.1.3 above, any legal or other fees, charges or expenses reasonably incurred
by such party in connection with any investigation or proceeding. The parties hereto agree that it would not be just and equitable
if contribution pursuant to this subsection 4.1.5 were determined by pro rata allocation or by any other method
of allocation, which does not take account of the equitable considerations referred to in this subsection 4.1.5. No
person guilty of fraudulent misrepresentation (within the meaning of Section 11(f) of the Securities Act) shall
be entitled to contribution pursuant to this subsection 4.1.5 from any person who was not guilty of such fraudulent
misrepresentation.

 

ARTICLE V

MISCELLANEOUS

 

5.1 Notices. Any notice or communication
under this Agreement must be in writing and given by (i) deposit in the United States mail, addressed to the party to be notified,
postage prepaid and registered or certified with return receipt requested, (ii) delivery in person or by courier service providing
evidence of delivery, or (iii) transmission by hand delivery, or facsimile. Each notice or communication that is mailed, delivered,
or transmitted in the manner described above shall be deemed sufficiently given, served, sent, and received, in the case of mailed
notices, on the third business day following the date on which it is mailed and, in the case of notices delivered by courier service,
hand delivery, or facsimile, at such time as it is delivered to the addressee (with the delivery receipt or the affidavit of messenger)
or at such time as delivery is refused by the addressee upon presentation. Any notice or communication under this Agreement must
be addressed, if to the Company, to: 9912 Georgetown Pike, Suite D203, Great Falls Virginia 22066, and, if to any Holder, at such
Holder’s address or contact information as set forth in the Company’s books and records. Any party may change its address
for notice at any time and from time to time by written notice to the other parties hereto, and such change of address shall become
effective thirty (30) days after delivery of such notice as provided in this Section 5.1.

  

5.2 Assignment; No Third Party Beneficiaries.

 

5.2.1 This Agreement and the rights, duties
and obligations of the Company hereunder may not be assigned or delegated by the Company in whole or in part.

 

5.2.2 Prior to the expiration of the Founder
Shares Lock-up Period or the Private Placement Lock-up Period, as the case may be, no Holder may assign or delegate such Holder’s
rights, duties or obligations under this Agreement, in whole or in part, except in connection with a transfer of Registrable Securities
by such Holder to a Permitted Transferee but only if such Permitted Transferee agrees to become bound by the transfer restrictions
set forth in this Agreement.

 

5.2.3 This Agreement and the provisions hereof
shall be binding upon and shall inure to the benefit of each of the parties and its successors and the permitted assigns of the
Holders, which shall include Permitted Transferees.

 

    12

     

    

 

5.2.4 This Agreement shall not confer any
rights or benefits on any persons that are not parties hereto, other than as expressly set forth in this Agreement and Section
5.2 hereof.

  

5.2.5 No assignment by any party hereto of
such party’s rights, duties and obligations hereunder shall be binding upon or obligate the Company unless and until the
Company shall have received (i) written notice of such assignment as provided in Section 5.1 hereof and (ii) the
written agreement of the assignee, in a form reasonably satisfactory to the Company, to be bound by the terms and provisions of
this Agreement (which may be accomplished by an addendum or certificate of joinder to this Agreement). Any transfer or assignment
made other than as provided in this Section 5.2 shall be null and void.

 

5.3 Counterparts. This Agreement
may be executed in multiple counterparts (including facsimile or PDF counterparts), each of which shall be deemed an original,
and all of which together shall constitute the same instrument, but only one of which need be produced.

 

5.4 Governing Law; Venue. NOTWITHSTANDING
THE PLACE WHERE THIS AGREEMENT MAY BE EXECUTED BY ANY OF THE PARTIES HERETO, THE PARTIES EXPRESSLY AGREE THAT (I) THIS AGREEMENT
SHALL BE GOVERNED BY AND CONSTRUED UNDER THE LAWS OF THE STATE OF NEW YORK AS APPLIED TO AGREEMENTS AMONG NEW YORK RESIDENTS ENTERED
INTO AND TO BE PERFORMED ENTIRELY WITHIN NEW YORK, WITHOUT REGARD TO THE CONFLICT OF LAW PROVISIONS OF SUCH JURISDICTION AND (II)
THE VENUE FOR ANY ACTION TAKEN WITH RESPECT TO THIS AGREEMENT SHALL BE ANY STATE OR FEDERAL COURT IN NEW YORK COUNTY IN THE STATE
OF NEW YORK.

 

5.5 Amendments and Modifications.
Upon the written consent of the Company and the Holders of at least a majority in interest of the Registrable Securities at the
time in question, compliance with any of the provisions, covenants and conditions set forth in this Agreement may be waived, or
any of such provisions, covenants or conditions may be amended or modified; provided, however, that notwithstanding
the foregoing, any amendment hereto or waiver hereof that adversely affects one Holder, solely in its capacity as a holder of the
shares of capital stock of the Company, in a manner that is materially different from the other Holders (in such capacity) shall
require the consent of the Holder so affected. No course of dealing between any Holder or the Company and any other party hereto
or any failure or delay on the part of a Holder or the Company in exercising any rights or remedies under this Agreement shall
operate as a waiver of any rights or remedies of any Holder or the Company. No single or partial exercise of any rights or remedies
under this Agreement by a party shall operate as a waiver or preclude the exercise of any other rights or remedies hereunder or
thereunder by such party.

 

5.6 Other Registration Rights. The
Company represents and warrants that no person, other than a Holder of Registrable Securities, has any right to require the Company
to register any securities of the Company for sale or to include such securities of the Company in any Registration filed by the
Company for the sale of securities for its own account or for the account of any other person. Further, the Company represents
and warrants that this Agreement supersedes any other registration rights agreement or agreement with similar terms and conditions
and in the event of a conflict between any such agreement or agreements and this Agreement, the terms of this Agreement shall prevail.

 

5.7 Term. This Agreement shall terminate
upon the earlier of (i) the tenth anniversary of the date of this Agreement or (ii) the date as of which (A) all of the Registrable
Securities have been sold pursuant to a Registration Statement (but in no event prior to the applicable period referred to in Section
4(a)(3) of the Securities Act and Rule 174 thereunder (or any successor rule promulgated thereafter by the Commission)) or (B)
the Holders of all Registrable Securities are permitted to sell the Registrable Securities under Rule 144 (or any similar provision)
under the Securities Act without limitation on the amount of securities sold or the manner of sale. The provisions of Section
3.5 and Article IV shall survive any termination.

 

[Signature Page Follows]

 

    13

     

    

 

 

  

IN WITNESS WHEREOF,
the undersigned have caused this Agreement to be executed as of the date first written above.

 

	 	COMPANY:
	 	 
	 	THUNDER BRIDGE CAPITAL PARTNERS
    III INC.., a Delaware corporation
	 	 	 
	 	By:	/s/
    Gary Simanson
	 	 	Name:   	Gary Simanson
	 	 	Title:  	Chief Executive Officer
	 	 
	 	HOLDERS:
	 	 
	 	TBCP III, LLC, a Delaware
    limited liability company
	 	 	 
	 	By:	/s/
    Gary Simanson
	 	 	Name: 	Gary Simanson
	 	 	Title:  	Managing Member

 

[Signature
Page to Registration Rights Agreement]

 

 

 

14Exhibit 10.6

 

UNIT SUBSCRIPTION AGREEMENT

 

This UNIT SUBSCRIPTION AGREEMENT (this “Agreement”)
is made as of the 4th day of February 2021, by and between Thunder Bridge Capital Partners III Inc., a Delaware corporation
(the “Company”), having its principal place of business at 9912 Georgetown Pike, Suite D203, Great Falls, Virginia
22066, and TBCP III, LLC, a Delaware limited liability company (the “Subscriber”), having its principal
place of business at 9912 Georgetown Pike, Suite D203, Great Falls, Virginia 22066.

 

WHEREAS, in connection with the Company’s
initial public offering of the Company’s units (the “IPO”), the Company desires to sell to the Subscriber
on a private placement basis (the “Offering”) an aggregate of 895,000 units (the “Initial Units”)
of the Company (or up to 1,003,000 Units if the over-allotment option in connection with the IPO is exercised in full, comprised
of the Initial Units and the Additional Units (as defined below)), each Unit comprised of one share of Class A common stock of
the Company, par value $0.0001 per share (“Common Stock”) and one fifth of one warrant, each whole warrant exercisable
to purchase one share of Common Stock (“Warrant”), for a purchase price of $10.00 per Unit. The shares of Common
Stock underlying the Warrants are hereinafter referred to as the “Warrant Shares”.  The shares of
Common Stock underlying the Units (excluding the Warrant Shares) are hereinafter referred to as the “Placement Shares.”
The Warrants underlying the Units are hereinafter referred to as the “Placement Warrants.”  The Units,
Placement Shares, Placement Warrants and Warrant Shares, collectively, are hereinafter referred to as the “Securities.”  Each
whole Placement Warrant is exercisable to purchase one share of Common Stock at an exercise price of $11.50 during the period commencing
on the later of (i) twelve (12) months from the date of the closing of the Company’s IPO and (ii) 30 days following the consummation
of the Company’s initial business combination (the “Business Combination”), as such term is defined in
the registration statement in connection with the IPO, as amended at the time it becomes effective (the “Registration
Statement”), and expiring on the fifth anniversary of the consummation of the Business Combination or earlier upon redemption
or liquidation as described in the Registration Statement; and

 

WHEREAS, the Subscriber wishes to purchase up
to 1,003,000 Units, and the Company wishes to accept such subscription from Subscriber.

 

NOW, THEREFORE, in consideration of the premises
and the mutual covenants hereinafter set forth and other good and valuable consideration, the receipt and sufficiency of which
are hereby acknowledged, the Company and Subscriber hereby agree as follows:

 

	 	1.	Agreement to Subscribe

 

	 	1.1.	Purchase and Issuance of the Units.  Upon the terms and subject to the conditions of this Agreement, the Subscriber hereby agrees to purchase from the Company, and the Company hereby agrees to sell to the Subscriber, on the Initial Closing Date (as defined below) the Initial Units in consideration of the payment of the Purchase Price (as defined below). On the Initial Closing Date, the Company shall, at its option, deliver to the Subscriber the certificates representing the Securities purchased or effect such delivery in book-entry form.  

  

	 	1.2.(i)	Purchase Price. As payment in full for the Initial Units being purchased under this Agreement, the Subscriber shall pay $8,950,000 (the “Purchase Price”) by wire transfer of immediately available funds or by such other method as may be reasonably acceptable to the Company, to the trust account (the “Trust Account”) at a financial institution to be chosen by the Company, maintained by Continental Stock Transfer & Trust Company, acting as trustee (“Continental”), at least one (1) business day prior to the date of effectiveness of the Registration Statement.
	 	 	 
	 	1.2.(ii)	
        In the event that the over-allotment
option is exercised in full or in part, Purchaser shall purchase up to an additional 90,000 Units (the “Additional Units”),
in the same proportion as the amount of the over-allotment option that is exercised, and simultaneously with such purchase of
Additional Units, as payment in full for the Additional Units being purchased hereunder, and at least one (1) business day
prior to the closing of all or any portion of the over-allotment option, Purchaser shall pay $10.00 per Additional Unit, up to
an aggregate amount of $900,000, by wire transfer of immediately available funds or by such other method as may be reasonably
acceptable to the Company, to the Trust Account.

 

     

     

    

 

1.3. Closing. The closing of the purchase and
sale of the Units shall take place simultaneously with the closing of the IPO (the “Initial Closing Date”).
The closing of the purchase and sale of the Additional Units, if applicable, shall take place simultaneously with the closing
of all or any portion of the over-allotment option (such closing date, together with the Initial Closing Date, the “Closing
Dates” and each, a “Closing Date”). The closing of the purchase and sale of each of the Initial Units
and the Additional Units shall take place at the offices of Ellenoff Grossman & Schole LLP, 1345 Avenue of the Americas, 11th Floor,
New York, New York, 10105, or such other place as may be agreed upon by the parties hereto.

 

1.4 Termination. This Agreement and each of
the obligations of the undersigned shall be null and void and without effect if the Initial Closing Date does not occur prior to
June 30, 2021.

 

	 	2.	Representations and Warranties of Subscriber

 

Subscriber represents and warrants to the Company
that:

 

2.1. No Government Recommendation or Approval.  Subscriber
understands that no federal or state agency has passed upon or made any recommendation or endorsement of the Company or the Offering
of the Securities.

 

2.2. Accredited Investor. 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 that the sale contemplated hereby is being made
in reliance, among other things, on a private placement exemption to “accredited investors” under the Securities Act
and similar exemptions under state law.

 

2.3. Intent.  Subscriber is purchasing
the Securities solely for investment purposes, for Subscriber’s own account (and/or for the account or benefit of its members
or affiliates, as permitted, pursuant to the terms of an agreement (the “Insider Letter”) to be entered into
with respect to the Securities between, among others, Subscriber  and the Company, as described in the Registration Statement),
and not with a view to the distribution thereof and Subscriber has no present arrangement to sell the Securities to or through
any person or entity except as may be permitted under the Insider Letter.  Subscriber shall not engage in hedging transactions
with regard to the Securities unless in compliance with the Securities Act.

 

2.4. Restrictions on Transfer.  Subscriber
acknowledges and understands the Units are being offered in a transaction not involving a public offering in the United States
within the meaning of the Securities Act.  The Securities have not been registered under the Securities Act and, if in
the future Subscriber decides to offer, resell, pledge or otherwise transfer the Securities, such Securities may be offered, resold,
pledged or otherwise transferred only (A) pursuant to an effective registration statement filed under the Securities Act,
(B) pursuant to an exemption from registration under Rule 144 promulgated under the Securities Act, if available, or (C) pursuant
to any other available exemption from the registration requirements of the Securities Act, and in each case in accordance with
any applicable securities laws of any state or any other jurisdiction. Notwithstanding the foregoing, Subscriber acknowledges and
understands the Securities are subject to transfer restrictions as described in Section 8 hereof. 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, Subscriber
may be required to deliver to the Company an opinion of counsel satisfactory to the Company with respect to such transfer. Absent
registration or another available exemption from registration, Subscriber agrees it will not resell the Securities (unless otherwise
permitted pursuant to the Insider Letter, as described in the Registration Statement).  Subscriber further acknowledges
that because the Company is a shell company, Rule 144 may not be available to Subscriber for the resale of the Securities until
the one year anniversary 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

     

    

 

2.5. Sophisticated Investor.

 

(i) Subscriber is sophisticated in financial
matters and is able to evaluate the risks and benefits of the investment in the Securities.

 

(ii) Subscriber is aware that an investment
in the Securities is highly speculative and subject to substantial risks because, among other things, the Securities are subject
to transfer restrictions and have not been registered under the Securities Act and therefore cannot be sold unless subsequently
registered under the Securities Act or an exemption from such registration is available. Subscriber is able to bear the economic
risk of its investment in the Securities for an indefinite period of time.

 

2.6. Independent Investigation.  Subscriber,
in making the decision to purchase the Units, has relied upon an independent investigation of the Company and has not relied upon
any information or representations made by any third parties or upon any oral or written representations or assurances from the
Company, its officers, directors or employees or any other representatives or agents of the Company, other than as set forth in
this Agreement. Subscriber is familiar with the business, operations and financial condition of the Company and has had an opportunity
to ask questions of, and receive answers from the Company’s officers and directors concerning the Company and the terms and
conditions of the offering of the Units and has had full access to such other information concerning the Company as Subscriber
has requested. Subscriber confirms that all documents that it has requested have been made available and that Subscriber has been
supplied with all of the additional information concerning this investment which Subscriber has requested.

 

2.7 Organization and Authority.  Subscriber
is duly organized, validly existing and in good standing under the laws of the State of Delaware and it possesses all requisite
power and authority necessary to carry out the transactions contemplated by this Agreement.

 

2.8. Authority. This Agreement has been validly
authorized, executed and delivered by Subscriber and is a valid and binding agreement enforceable in accordance with its terms,
subject to the general principles of equity and to bankruptcy or other laws affecting the enforcement of creditors’ rights
generally.

 

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

 

2.10. No Legal Advice from Company.  Subscriber
acknowledges it has had the opportunity to review this Agreement and the transactions contemplated by this Agreement and the other
agreements entered into between the parties hereto with Subscriber’s own legal counsel and investment and tax advisors.  Except
for any statements or representations of the Company made in this Agreement and the other agreements entered into between the parties
hereto, Subscriber is relying solely on such counsel and advisors and not on any statements or representations of the Company or
any of its representatives or agents for legal, tax or investment advice with respect to this investment, the transactions contemplated
by this Agreement or the securities laws of any jurisdiction.

 

2.11. Reliance on Representations and Warranties.  Subscriber
understands the Units are being offered and sold to Subscriber in reliance on exemptions from the registration requirements under
the Securities Act, and analogous provisions in the laws and regulations of various states, and that the Company is relying upon
the truth and accuracy of the representations, warranties, agreements, acknowledgments and understandings of Subscriber set forth
in this Agreement in order to determine the applicability of such provisions.

 

2.12. No General Solicitation.  Subscriber
is not subscribing for the Units as a result of or subsequent to any general solicitation or general advertising, including but
not limited to any advertisement, article, notice or other communication published in any newspaper, magazine, or similar media
or broadcast over television or radio, or presented at any seminar or meeting or in a registration statement with respect to the
IPO filed with the Securities and Exchange Commission (“SEC”).

 

2.13. Legend.  Subscriber acknowledges
and agrees the certificates evidencing each of the Securities shall bear a restrictive legend (the “Legend”),
in form and substance substantially as set forth in Section 4 hereof.

 

    3

     

    

 

	 	3.	Representations, Warranties and Covenants of the Company

 

The Company represents and warrants to, and
agrees with, Subscriber that:

 

3.1. Valid Issuance of Capital Stock. The total
number of shares of all classes of capital stock which the Company has authority to issue is 200,000,000 shares of Class A Common
Stock, 20,000,000 shares of Class B Common Stock, $0.0001 par value per share (the “Class B Common Stock”),
and 1,000,000 shares of preferred stock, $0.0001 par value per share (“Preferred Stock”). As of the date hereof,
the Company has issued and outstanding 10,350,000 shares of Class B Common Stock (of which up to 1,350,000 shares are subject to
forfeiture as described in the Registration Statement), no shares of Class A Common Stock and no shares of Preferred Stock. All
of the issued shares of capital stock of the Company have been duly authorized, validly issued, and are fully paid and non-assessable.

 

3.2 Title to Securities.  Upon issuance
in accordance with, and payment pursuant to, the terms hereof and that certain warrant agreement to be entered into between the
Company and Continental, as warrant agent (the “Warrant Agreement”), as the case may be, each of the Units,
Placement Shares, Placement Warrants and Warrant Shares will be duly and validly issued, fully paid and non-assessable. On the
date of issuance of the Units and Warrant Shares shall have been reserved for issuance. Upon issuance in accordance with, and payment
pursuant to, the terms hereof and the Warrant Agreement, as the case may be, Subscriber will have or receive good title to the
Units, Placement Shares and Placement Warrants, free and clear of all liens, claims and encumbrances of any kind, other than (i)
transfer restrictions hereunder and pursuant to the Insider Letter and (ii) transfer restrictions under federal and state securities
laws.

 

3.3. Organization and Qualification. The Company
is a corporation duly incorporated, validly existing and in good standing under the laws of the State of Delaware and has the requisite
corporate power to own its properties and assets and to carry on its business as now being conducted.

 

3.4. Authorization; Enforcement. (i) The
Company has the requisite corporate power and authority to enter into and perform its obligations under this Agreement and to issue
the Securities in accordance with the terms hereof, (ii) the execution, delivery and performance of this Agreement by the
Company and the consummation by it of the transactions contemplated hereby have been duly authorized by all necessary corporate
action, and no further consent or authorization of the Company or its Board of Directors or stockholders is required, and (iii) this
Agreement constitutes valid and binding obligations 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, moratorium, reorganization,
or similar laws relating to, or affecting generally the enforcement of, creditors’ rights and remedies or by equitable principles
of general application and except as enforcement of rights to indemnity and contribution may be limited by federal and state securities
laws or principles of public policy.

 

3.5. No Conflicts. The execution, delivery and
performance of this Agreement and the consummation by the Company of the transactions contemplated hereby do not (i) result
in a violation of the Company’s certificate of incorporation or by-laws, (ii) conflict with, or constitute a default
under any agreement 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. Other than any SEC or state securities
filings which may be required to be made by the Company subsequent to the Closing, and any registration statement which may be
filed pursuant thereto, the Company is not required under federal, state or local law, rule or regulation to obtain any consent,
authorization or order of, or make any filing or registration with, any court or governmental agency or self-regulatory entity
in order for it to perform any of its obligations under this Agreement or issue the Units, Placement Shares, Placement Warrants
or Warrant Shares in accordance with the terms hereof.

 

    4

     

    

 

	 	4.	Legends

 

4.1 .Legend. The Company will issue the Units,
Placement Shares and Placement Warrants, and when issued, the Warrant Shares, purchased by the Subscriber in the name of the Subscriber.
The Securities will bear the following Legend and appropriate “stop transfer” instructions:

 

“THE SECURITIES REPRESENTED
HEREBY HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), 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 THE SECURITIES ACT OR SUCH LAWS OR AN EXEMPTION FROM REGISTRATION UNDER THE
SECURITIES ACT AND SUCH LAWS WHICH, IN THE OPINION OF COUNSEL FOR THIS CORPORATION, IS AVAILABLE.”

 

“THE SECURITIES REPRESENTED
BY THIS CERTIFICATE ARE SUBJECT TO LOCKUP PURSUANT TO AN INSIDER LETTER BETWEEN, AMONG OTHERS, THUNDER BRDIGE CAPITAL PARTNERS
III INC. AND TBCP III, LLC AND MAY ONLY BE OFFERED, SOLD, TRANSFERRED, PLEDGED OR OTHERWISE DISPOSED DURING THE TERM OF THE LOCKUP
PURSUANT TO THE TERMS SET FORTH IN THE INSIDER LETTER.”

 

“THE SECURITIES REPRESENTED
HEREBY SHALL BE ENTITLED TO REGISTRATION RIGHTS UNDER A REGISTRATION RIGHTS AGREEMENT WITH THE CORPORATION.”

 

4.2. Subscriber’s Compliance. Nothing
in this Section 4 shall affect in any way Subscriber’s obligations and agreements to comply with all applicable securities
laws upon resale of the Securities.

 

4.3. Company’s Refusal to Register Transfer
of the Securities.  The Company shall refuse to register any transfer of the Securities, if in the sole judgment of the
Company such purported transfer would not be made (i) pursuant to an effective registration statement filed under the Securities
Act, or pursuant to an available exemption from the registration requirements of the Securities Act and (ii) in compliance herewith
and with the Insider Letter.

 

4.4 Registration Rights.  The Subscriber
will be entitled to certain registration rights which will be governed by a registration rights agreement (“Registration
Rights Agreement”) to be entered into between, among others, the Subscriber and the Company, on or prior to the effective
date of the Registration Statement. 

 

	 	5.	Waiver of Liquidation Distributions.

 

In connection with the Securities purchased
pursuant to this Agreement, Subscriber hereby waives any and all right, title, interest or claim of any kind in or to any distributions
of the amounts in the Trust Account with respect to the Securities, whether (i) in connection with the exercise of redemption rights
if the Company consummates the Business Combination, (ii) in connection with any tender offer conducted by the Company prior to
a Business Combination, (iii) upon the Company’s redemption of shares of Common Stock sold in the Company’s IPO upon
the Company’s failure to timely complete the Business Combination or (iv) in connection with a stockholder vote to approve
an amendment to the Company’s amended and restated certificate of incorporation (A) to modify the substance or timing of
the Company’s obligation to redeem 100% of the Company’s public shares if the Company does not timely complete the
Business Combination or (B) with respect to any other provision relating to stockholders’ rights or pre-Business Combination
activity.  In the event a Subscriber purchases shares of Common Stock in the IPO or in the aftermarket, any additional
shares so purchased shall be eligible to receive the redemption value of such shares of Common Stock upon the same terms offered
to all other purchasers of Common Stock in the IPO in the event the Company fails to consummate the Business Combination.

  

	 	6.	Terms of Placement Warrants. Each Placement Warrant shall have the terms set forth in the Warrant Agreement.

 

	 	7.	[Reserved].

  

	 	8.	Terms of the Units and Placement Warrants

 

8.1 The Units and their component parts are
substantially identical to the units to be offered in the IPO except that: (i) the Units and component parts will be subject to
transfer restrictions described in the Insider Letter, (ii) the Placement Warrants will be non-redeemable so long as they are held
by the initial holder thereof (or any of its permitted transferees), and may be exercisable on a “cashless” basis
if held by a Subscriber or its permitted transferees, as further described in the Warrant Agreement and (iii) the Units and component
parts are being purchased pursuant to an exemption from the registration requirements of the Securities Act and will become freely
tradable only after the expiration of the lockup described above in clause (i) and they are registered pursuant to the Registration
Rights Agreement to be signed on or before the date of the Prospectus or an exemption from registration is available.

 

    5

     

    

 

8.2 Subscriber agrees to vote the Placement
Shares in accordance with the terms of the Insider Letter and as otherwise described in the Registration Statement.

 

	 	9.	Governing Law; Jurisdiction; Waiver of Jury Trial

 

This Agreement shall be governed by and construed
in accordance with the laws of the State of New York for agreements made and to be wholly performed within such state. The parties
hereto hereby waive any right to a jury trial in connection with any litigation pursuant to this Agreement and the transactions
contemplated hereby.

  

	 	10.	Assignment; Entire Agreement; Amendment

 

10.1. Assignment. Neither this Agreement nor
any rights hereunder may be assigned by any party to any other person other than by a Subscriber to a person agreeing to be bound
by the terms hereof.

 

10.2. Entire Agreement. This Agreement sets
forth the entire agreement and understanding between the parties as to the subject matter thereof and merges and supersedes all
prior discussions, agreements and understandings of any and every nature among them.

 

10.3. Amendment. Except as expressly provided
in this Agreement, neither this Agreement nor any term hereof may be amended, waived, discharged or terminated other than by a
written instrument signed by all of the parties hereto.

 

10.4. Binding upon Successors. This Agreement
shall be binding upon and inure to the benefit of the parties hereto and to their respective heirs, legal representatives, successors
and permitted assigns. 

 

	 	11.	Notices

 

11.1 Notices. Unless otherwise provided herein,
any notice or other communication to a party hereunder shall be sufficiently given if in writing and personally delivered or sent
by facsimile or other electronic transmission with copy sent in another manner herein provided or sent by courier (which for all
purposes of this Agreement shall include Federal Express or other recognized overnight courier) or mailed to said party by certified
mail, return receipt requested, at its address provided for herein or such other address as either may designate for itself in
such notice to the other.  Communications shall be deemed to have been received when delivered personally, on the scheduled
arrival date when sent by next day or 2nd-day courier service, or if sent by facsimile upon receipt of confirmation of transmittal
or, if sent by mail, then three days after deposit in the mail. If given by electronic transmission, such notice shall be deemed
to be delivered (a) if by electronic mail, when directed to an electronic mail address at which the stockholder has consented
to receive notice; (b) if by a posting on an electronic network together with separate notice to the stockholder of such specific
posting, upon the later of (1) such posting and (2) the giving of such separate notice; and (c) if by any other
form of electronic transmission, when directed to the stockholder.

 

	 	12.	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 by e-mail delivery of a “pdf” format data file,
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 facsimile or “.pdf” signature page were an original thereof.

 

    6

     

    

 

	 	13.	Survival; Severability

 

13.1. Survival. The representations, warranties,
covenants and agreements of the parties hereto shall survive the Closing Date.

 

13.2. Severability. In the event that any provision
of this Agreement becomes or is declared by a court of competent jurisdiction to be illegal, unenforceable or void, this Agreement
shall continue in full force and effect without said provision; provided that no such severability shall be effective if it materially
changes the economic benefit of this Agreement to any party.

 

	 	14.	Headings.

 

The titles and subtitles used in this Agreement
are used for convenience only and are not to be considered in construing or interpreting this Agreement.

 

[remainder of page intentionally left blank]

 

    7

     

    

 

IN
WITNESS WHEREOF, the parties hereto have executed this Agreement to be effective as of the date first set forth above.

 

	 	COMPANY:
	 	 
	 	THUNDER BRIDGE CAPITAL PARTNERS
    III INC.
	 	 	 
	 	By:	/s/
    Gary A. Simanson
	 	 	Name: Gary A. Simanson
	 	 	Title:   President and Chief Executive
    Officer

 

	 	SUBSCRIBER:
	 	 
	 	TBCP III, LLC
	 	 	 
	 	By:	/s/
    Gary A. Simanson
	 	 	Name: Gary A. Simanson
	 	 	Title:   Managing Member

 

[Unit Subscription
Agreement with Sponsor]

 

 

8

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