EX-10.4





 Exhibit 10.4

REGISTRATION RIGHTS AGREEMENT 

THIS REGISTRATION RIGHTS AGREEMENT (this “Agreement”), dated as of
[ 🌑 ], 2021 is made and entered into by and among RMG Acquisition Corp. VI, a Cayman Islands exempted company (the “Company”), and RMG Sponsor VI, LLC, a Delaware limited
liability company (the “Sponsor”), and any other parties listed on the signature pages hereto (together with the Sponsor and 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 “Holder”). 

RECITALS 
 WHEREAS,
the Company and the Sponsor have entered into that certain Securities Subscription Agreement, dated as of February 17, 2021, pursuant to which the Sponsor subscribed for an aggregate of 16,531,250 Class B ordinary shares, par value $0.0001
per share, of the Company (the “Founder Shares”) (which includes up to 2,156,250 shares that are subject to forfeiture by our Sponsor depending on the extent to which the underwriters’ over-allotment option is
exercised); 
 WHEREAS, the Founder Shares are convertible into the Company’s Class A ordinary shares, par value $0.0001
per share (the “Ordinary Shares”), at the time of the initial Business Combination (as defined below), or earlier at the option of the holder, on a
one-for-one basis, subject to adjustment, on the terms and conditions provided in the Company’s amended and restated memorandum and articles of association, as may
be amended from time to time; 
 WHEREAS, on [ 🌑 ], 2021, the Company and the
Sponsor entered into that certain Sponsor Warrants Purchase Agreement (the “Private Placement Warrants Purchase Agreement”), pursuant to which the Sponsor agreed to purchase 7,077,500 warrants (or up to 7,940,000 warrants
depending on the extent to which the underwriters in the Company’s initial public offering exercise their over-allotment option) (the “Private Placement Warrants”), in a private placement transaction occurring
simultaneously with the closing of the Company’s initial public offering, each Private Placement Warrant entitling the holder thereof to purchase one Ordinary Share at a price of $11.50; 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: 

  
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 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, the President or the 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, amalgamation, share exchange, asset acquisition, share purchase,
reorganization or other similar business combination with one or more businesses, involving the Company. 

“Commission” shall mean the U.S. Securities and Exchange Commission. 

“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 Ordinary
Shares 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 Ordinary Shares equals or exceeds $12.00 per share (as adjusted for share sub-divisions, share dividends, rights issuances, consolidations, reorganizations,
recapitalizations and other similar transactions) 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, amalgamation, share exchange, reorganization or other similar transaction that results in all of the Company’s public shareholders having the right to exchange their Ordinary Shares for
cash, securities or other property. 
 “Holders” shall have the meaning given in the Preamble. 

“Insider Letter” shall mean that certain letter agreement, dated as of 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. 

  
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 “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. 
 “Ordinary Shares” shall have the meaning given in the Recitals hereto. 

“Permitted Transferees” shall mean a 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 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. 

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

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

“Private Placement Warrants Purchase Agreement” shall have the meaning given in the Recitals hereto. 

“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 Ordinary Shares issued or issuable upon the conversion of any Founder
Shares, (b) the Private Placement Warrants (including any Ordinary Shares issued or issuable upon the exercise of any such Private Placement Warrants), (c) any outstanding Ordinary Shares or any other equity security (including the Ordinary
Shares 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 equity securities (including the Ordinary Shares issued or issuable upon the exercise of any
such equity security) of the Company issuable upon conversion of any working capital loans in an amount up to $1,500,000 made to the Company by a Holder, and (e) any other equity security of the Company sold or issued or issuable with respect
to any such Ordinary Share by way of a share dividend or share sub-division or in connection with a combination of shares, recapitalization, merger, amalgamation, consolidation,
spin-off 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 (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: 

  
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 (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 Ordinary Shares are then listed; 

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

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 initial Business Combination, the Holders of at least thirty percent (30%) in interest of the then outstanding number of Registrable
Securities (the “Demanding Holders”) may make a written demand for Registration under the Securities Act 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), 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, the Registration of all Registrable Securities requested by the Demanding Holder(s) and


  
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Requesting Holder(s) pursuant to such Demand Registration, including by filing a Registration Statement relating thereto as soon as practicable, but not more than forty five (45) days
immediately after the Company’s receipt of the 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. 

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; 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 Ordinary Shares or other equity securities that the Company desires to
sell and the Ordinary Shares, if any, as to which a Registration has been requested pursuant to separate written contractual piggy-back registration rights held by any other shareholders 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 such Holder has requested be included in such Underwritten Registration and the aggregate number of Registrable
Securities that such 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 Ordinary Shares or other equity securities that the Company desires to sell, which can be sold 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 Ordinary Shares 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, (i) the Company may effect any Underwritten Registration pursuant to any then effective Registration Statement, including a Form S-3, that is then available for such offering and (ii) 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 an initial 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 shareholders of the Company (or by the Company and by the shareholders of the Company), other than a Registration Statement (i) filed in connection with any employee share option or other benefit plan, (ii) for an
exchange offer or offering of securities solely to the Company’s existing shareholders, (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 Ordinary Shares that the Company desires to sell,
taken together with (i) the Ordinary Shares, 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 Ordinary Shares, if any, as to which Registration has been requested pursuant to separate written contractual
piggy-back registration rights of other shareholders 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 Ordinary Shares 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, based on the respective number of Registrable 

  
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Securities that each Holder has so requested exercising its rights to register its Registrable Securities pursuant to subsection 2.2.1 hereof, 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 Ordinary Shares, if any, as to which Registration has been requested
pursuant to written contractual piggy-back registration rights of other shareholders of the Company, which can be sold without exceeding the Maximum Number of Securities; 

(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 Ordinary Shares 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 Ordinary Shares 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 Ordinary Shares 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. The Holders 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 pursuant to this Section 2.3 (“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 file a Registration Statement relating to 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 

  
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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 $5,000,000. 
 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. Notwithstanding anything to the contrary contained in this Agreement, the
Company shall not be required to effect or permit any Registration or cause any Registration Statement to become effective, with respect to any Registrable Securities held by any Holder, until after the expiration of the Founder Shares Lock-Up Period or the Private Placement Lock-Up Period, as the case may be. 

ARTICLE III 
 COMPANY
PROCEDURES 
 3.1 General Procedures. If at any time on or after the date the Company consummates an initial 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 reasonably requested by the majority-in-interest of the Holders with Registrable Securities
registered on such Registration Statement 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 the Holders of Registrable Securities included in such Registration, and such Holders’ 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 the Holders 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;


  
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 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 the Holders 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; 

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 furnish a copy thereof to each seller of such Registrable Securities or its counsel; 
 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, 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; 

3.1.11 obtain a “cold comfort” letter from the Company’s independent registered public accountants in the event of an
Underwritten Registration, 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; 

  
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 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 $25,000,000, 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 he, she or 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 he, she or 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 Ordinary Shares 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. 

  
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 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, directors and
agents and each person who controls such Holder (within the meaning of the Securities Act) against all losses, claims, damages, liabilities and out-of-pocket expenses
(including without limitation reasonable outside attorneys’ fees) resulting from 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 or affidavit
so 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, officers and agents and each person who controls the Company (within the meaning of the Securities Act) against all losses, claims, damages, liabilities
and out-of-pocket expenses (including without limitation reasonable outside attorneys’ fees) resulting from 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, 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 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. 

  
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 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 out-of-pocket
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 out-of-pocket 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 out-of-pocket 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, electronic mail 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, electronic mail 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: 50 West Street, Suite 40C, New York, NY 10006, Attention: Philip Kassin, President, and, if to any Holder, at such Holder’s address or facsimile number 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. 
 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. 

  
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 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 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. 
 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 his, her or its capacity as a holder of the shares 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 with respect to any Holder on
the date that such Holder no longer holds any Registrable Securities. The provisions of Section 3.5 and Article IV shall survive any termination. 

[Signature Page Follows] 

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

			
	
	COMPANY:
	
	RMG ACQUISITION CORP. VI,
	a Cayman Islands exempted company
		
	By:	 	  

		 	Name: Wesley Sima
		 	Title: Chief Financial Officer
	
	HOLDER:
	
	RMG SPONSOR VI, LLC,
	a Delaware limited liability company
		
	By:	 	  

		 	Name: Wesley Sima
		 	Title: Chief Financial Officer
	
	  

	Name: [•]


  

  
 [Signature Page to
Registration Rights Agreement]