EX-10.9





 Exhibit 10.9 

FORM OF INDEMNITY AGREEMENT 

THIS INDEMNITY AGREEMENT (this “Agreement”) is made as of October 21, 2021, by and between M3-Brigade Acquisition III Corp., a Delaware corporation (the “Company”), and William Gallagher (“Indemnitee”). 

RECITALS 
 WHEREAS,
highly competent persons have become more reluctant to serve publicly-held corporations as directors, officers or in other capacities unless they are provided with adequate protection through insurance or adequate indemnification against inordinate
risks of claims and actions against them arising out of their service to and activities on behalf of such corporations; 
 WHEREAS,
the board of directors of the Company (the “Board”) has determined that, in order to attract and retain qualified individuals, the Company will attempt to maintain on an ongoing basis, at its sole expense, liability insurance
to protect persons serving the Company and its subsidiaries from certain liabilities; 
 WHEREAS, directors, officers and other
persons in service to corporations or business enterprises are being increasingly subjected to expensive and time-consuming litigation relating to, among other things, matters that traditionally would have been brought only against the Company or
business enterprise itself; 
 WHEREAS, the Amended and Restated Certificate of Incorporation (the “Charter”)
and the Bylaws (the “Bylaws”) of the Company require indemnification of the officers and directors of the Company. Indemnitee may also be entitled to indemnification pursuant to applicable provisions of the Delaware General
Corporation Law (“DGCL”). The Charter, Bylaws and the DGCL expressly provide that the indemnification provisions set forth therein are not exclusive, and thereby contemplate that contracts may be entered into between the
Company and members of the Board, officers and other persons with respect to indemnification, hold harmless, exoneration, advancement and reimbursement rights; 

WHEREAS, the uncertainties relating to such insurance and to indemnification have increased the difficulty of attracting and retaining
such persons; 
 WHEREAS, the Board has determined that the increased difficulty in attracting and retaining such persons is
detrimental to the best interests of the Company’s stockholders and that the Company should act to assure such persons that there will be increased certainty of such protection in the future; 

WHEREAS, it is reasonable, prudent and necessary for the Company contractually to obligate itself to indemnify, hold harmless,
exonerate and to advance expenses on behalf of, such persons to the fullest extent permitted by applicable law so that they will serve or continue to serve the Company free from undue concern that they will not be so protected against liabilities;













 WHEREAS, this Agreement is a supplement to and in furtherance of the Charter and
Bylaws and any resolutions adopted pursuant thereto, and shall not be deemed a substitute therefor, nor to diminish or abrogate any rights of Indemnitee thereunder; and 

WHEREAS, Indemnitee may not be willing to serve as an officer or director, advisor or in another capacity without adequate protection,
and the Company desires Indemnitee to serve in such capacity. Indemnitee is willing to serve, continue to serve and to take on additional service for or on behalf of the Company on the condition that Indemnitee be so indemnified. 

NOW, THEREFORE, in consideration of the premises and the covenants contained herein, the Company and Indemnitee do hereby covenant and
agree as follows: 
 TERMS AND CONDITIONS 

1. SERVICES TO THE COMPANY. Indemnitee will serve or continue to serve as an officer, director, advisor, key employee or in any other
capacity of the Company, as applicable, for so long as Indemnitee is duly elected or appointed or retained or until Indemnitee tenders Indemnitee’s resignation or until Indemnitee is removed. The foregoing notwithstanding, this Agreement shall
continue in full force and effect after Indemnitee has ceased to serve as a director, officer, advisor, key employee or in any other capacity of the Company, in each case as provided in Section 17. This Agreement, however, shall not impose any
obligation on Indemnitee or the Company to continue Indemnitee’s service to the Company beyond any period otherwise required by law or by other agreements or commitments of the parties, if any. 

2. DEFINITIONS. As used in this Agreement: 

(a) “agent” shall mean any person who is or was a director, officer or employee of the Company or a subsidiary of the
Company or other person authorized by the Company to act for the Company, to include such person serving in such capacity as a director, officer, employee, fiduciary or other official of another corporation, partnership, limited liability company,
joint venture, trust or other enterprise at the request of, for the convenience of, or to represent the interests of the Company or a subsidiary of the Company. 

(b) “Beneficial Owner” and “Beneficial Ownership” shall have the meanings set forth in Rule 13d-3 promulgated under the Exchange Act (as defined below) as in effect on the date hereof. 
 (c)
“Change in Control” shall be deemed to occur upon the earliest to occur after the date of this Agreement of any of the following events 

(i) Acquisition of Stock by Third Party. Other than M3-Brigade Sponsor III LP (the
“Sponsor”) or any of its affiliates, any Person (as defined below) is or becomes the Beneficial Owner, directly or indirectly, of securities of the Company representing fifteen percent (15%) or more of the combined voting
power of the Company’s then outstanding securities entitled to vote generally in the election of directors, unless (1) the change in the relative Beneficial Ownership of the Company’s securities by any Person results solely from a
reduction in the aggregate number of outstanding shares of securities entitled to vote generally in the election of directors, or (2) such acquisition was approved in advance by the Continuing Directors (as defined below) and such acquisition
would not constitute a Change in Control under part (iii) of this definition; 

  
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 (ii) Change in Board of Directors. Individuals who, as of the date hereof,
constitute the Board, and any new director whose election by the Board or nomination for election by the Company’s stockholders was approved by a vote of at least two thirds of the directors then still in office who were directors on the date
hereof or whose election for nomination for election was previously so approved (collectively, the “Continuing Directors”), cease for any reason to constitute at least a majority of the members of the Board; 

(iii) Corporate Transactions. The effective date of a merger, capital stock exchange, asset acquisition, stock purchase,
reorganization or similar business combination, involving the Company and one or more businesses (a “Business Combination”), in each case, unless, following such Business Combination: (1) all or substantially all of the
individuals and entities who were the Beneficial Owners of securities entitled to vote generally in the election of directors immediately prior to such Business Combination beneficially own, directly or indirectly, more than 51% of the combined
voting power of the then outstanding securities of the Company entitled to vote generally in the election of directors resulting from such Business Combination (including, without limitation, a corporation which as a result of such transaction owns
the Company or all or substantially all of the Company’s assets either directly or through one or more Subsidiaries (as defined below)) in substantially the same proportions as their ownership immediately prior to such Business Combination, of
the securities entitled to vote generally in the election of directors; (2) other than an affiliate of the Sponsor, no Person (excluding any corporation resulting from such Business Combination) is the Beneficial Owner, directly or indirectly,
of fifteen percent (15%) or more of the combined voting power of the then outstanding securities entitled to vote generally in the election of directors of the surviving corporation except to the extent that such ownership existed prior to the
Business Combination; and (3) at least a majority of the Board of Directors of the corporation resulting from such Business Combination were Continuing Directors at the time of the execution of the initial agreement, or of the action of the
Board of Directors, providing for such Business Combination; 
 (iv) Liquidation. The approval by the stockholders of the Company of
a complete liquidation of the Company or an agreement or series of agreements for the sale or disposition by the Company of all or substantially all of the Company’s assets, other than factoring the Company’s current receivables or escrows
due (or, if such stockholder approval is not required, the decision by the Board to proceed with such a liquidation, sale, or disposition in one transaction or a series of related transactions); or 

(v) Other Events. There occurs any other event of a nature that would be required to be reported in response to Item 6(e) of Schedule
14A of Regulation 14A (or any successor rule) (or a response to any similar item on any similar schedule or form) promulgated under the Exchange Act (as defined below), whether or not the Company is then subject to such reporting requirement. 

(d) “Corporate Status” describes the status of a person who is or was a director, officer, trustee, general partner,
manager, managing member, fiduciary, employee or agent of the Company or of any other Enterprise (as defined below) which such person is or was serving at the request of the Company. 

  
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 (e) “Delaware Court” shall mean the Court of Chancery of the State
of Delaware. 
 (f) “Disinterested Director” shall mean a director of the Company who is not and was not a party to
the Proceeding (as defined below) in respect of which indemnification is sought by Indemnitee. 
 (g) “Enterprise”
shall mean the Company and any other corporation, constituent corporation (including any constituent of a constituent) absorbed in a consolidation or merger to which the Company (or any of its wholly owned subsidiaries) is a party, limited liability
company, partnership, joint venture, trust, employee benefit plan or other enterprise of which Indemnitee is or was serving at the request of the Company as a director, officer, trustee, manager, general partner, managing member, fiduciary, employee
or agent. 
 (h) “Exchange Act” shall mean the Securities Exchange Act of 1934, as amended. 

(i) “Expenses” shall include all direct and indirect costs, fees and expenses of any type or nature whatsoever,
including, without limitation, all reasonable attorneys’ fees and costs, retainers, court costs, transcript costs, fees of experts, witness fees, travel expenses, fees of private investigators and professional advisors, duplicating costs,
printing and binding costs, telephone charges, postage, delivery service fees, fax transmission charges, secretarial services and all other disbursements, obligations or expenses in connection with prosecuting, defending, preparing to prosecute or
defend, investigating, being or preparing to be a witness in, settlement or appeal of, or otherwise participating in, a Proceeding (as defined below), including reasonable compensation for time spent by Indemnitee for which he or she is not
otherwise compensated by the Company or any third party. Expenses also shall include Expenses incurred in connection with any appeal resulting from any Proceeding (as defined below), including without limitation the principal, premium, security for,
and other costs relating to any cost bond, supersedeas bond, or other appeal bond or its equivalent. “Expenses,” however, shall not include amounts paid in settlement by Indemnitee or the amount of judgments or fines against Indemnitee.

 (j) “fines” shall include any excise tax assessed on Indemnitee with respect to any employee benefit plan; 

(k) “Indemnitee-Related Entities” means any company, corporation, limited liability company, partnership, joint
venture, trust, employee benefit plan or other entity or enterprise (other than the Company or any other company, corporation, limited liability company, partnership, joint venture, trust, employee benefit plan or other entity or enterprise
Indemnitee has agreed, on behalf of the Company or at the Company’s request, to serve as a director, officer, employee or agent and which service is covered by the indemnity described in this Agreement) from whom an Indemnitee may be entitled
to indemnification or advancement of Expenses with respect to which, in whole or in part, the Company may also have an indemnification or advancement obligation 

  
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 (l) “Independent Counsel” shall mean a law firm or a member of a law
firm with significant experience in matters of corporate law and that neither presently is, nor in the past three years has been, retained to represent: (i) the Company or Indemnitee in any matter material to either such party (other than with
respect to matters concerning Indemnitee under this Agreement, or of other indemnitees under similar indemnification agreements); or (ii) any other party to the Proceeding (as defined below) giving rise to a claim for indemnification hereunder.
Notwithstanding the foregoing, the term “Independent Counsel” shall not include any person who, under the applicable standards of professional conduct then prevailing, would have a conflict of interest in representing either the Company or
Indemnitee in an action to determine Indemnitee’s rights under this Agreement. 
 (m) “Jointly Indemnifiable
Claim” means any Expenses, judgments, liabilities, fines, penalties and amounts paid in settlement (including all interest, assessments and other charges paid or payable in connection with or in respect of such Expenses, judgments,
liabilities, fines, penalties and amounts paid in settlement) actually, and reasonably incurred by Indemnitee or on Indemnitee’s behalf in connection with a Proceeding or any claim, issue or matter therein which the Indemnitee may be entitled
to indemnification from both an Indemnitee-Related Entity and the Company pursuant to applicable law, any indemnification agreement or the certificate of incorporation, by-laws, partnership agreement,
operating agreement, certificate of formation, certificate of limited partnership or comparable organizational documents of the Company and an Indemnitee-Related Entity. 

(n) “Person” shall have the meaning as set forth in Sections 13(d) and 14(d) of the Exchange Act as in effect on the
date hereof; provided, however, that “Person” shall exclude: (i) the Company; (ii) any Subsidiaries (as defined below) of the Company; (iii) any employment benefit plan of the Company or of a Subsidiary (as defined below) of
the Company or of any corporation owned, directly or indirectly, by the stockholders of the Company in substantially the same proportions as their ownership of stock of the Company; and (iv) any trustee or other fiduciary holding securities
under an employee benefit plan of the Company or of a Subsidiary (as defined below) of the Company or of a corporation owned directly or indirectly by the stockholders of the Company in substantially the same proportions as their ownership of stock
of the Company. 
 (o) “Proceeding” shall include any threatened, pending or completed action, suit, arbitration,
mediation, alternate dispute resolution mechanism, investigation, inquiry, administrative hearing or any other actual, threatened or completed proceeding, whether brought in the right of the Company or otherwise and whether of a civil (including
intentional or unintentional tort claims), criminal, administrative or investigative or related nature, in which Indemnitee was, is, will or might be involved as a party or otherwise by reason of the fact that Indemnitee is or was a director or
officer of the Company, by reason of any action (or failure to act) taken by Indemnitee or of any action (or failure to act) on Indemnitee’s part while acting as a director or officer of the Company, or by reason of the fact that Indemnitee is
or was serving at the request of the Company as a director, officer, trustee, general partner, manager, managing member, fiduciary, employee or agent of any other Enterprise, in each case whether or not serving in such capacity at the time any
liability or expense is incurred for which indemnification, reimbursement, or advancement of expenses can be provided under this Agreement. 

  
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 (p) “Subsidiary,” with respect to any Person, shall mean any
corporation, limited liability company, partnership, joint venture, trust or other entity of which a majority of the voting power of the voting equity securities or equity interest is owned, directly or indirectly, by that Person. 

3. INDEMNITY. To the fullest extent permitted by applicable law, the Company shall indemnify, hold harmless and exonerate Indemnitee in
accordance with the provisions of this Section 3 if Indemnitee was, is, or is threatened to be made, a party to or a participant (as a witness, deponent or otherwise) in any Proceeding. Pursuant to this Section 3, to the fullest extent
permitted by applicable law, Indemnitee shall be indemnified, held harmless and exonerated against all Expenses, judgments, liabilities, fines, penalties and amounts paid in settlement (including all interest, assessments and other charges paid or
payable in connection with or in respect of such Expenses, judgments, liabilities, fines, penalties and amounts paid in settlement) actually, and reasonably incurred by Indemnitee or on Indemnitee’s behalf in connection with such Proceeding or
any claim, issue or matter therein. 
 4. [INTENTIONALLY OMITTED.] 

5. INDEMNIFICATION FOR EXPENSES OF A PARTY WHO IS WHOLLY OR PARTLY SUCCESSFUL. Notwithstanding any other provisions of this Agreement
except for Section 27, to the extent that Indemnitee was or is, by reason of Indemnitee’s Corporate Status, a party to (or a participant in) and is successful, on the merits or otherwise, in any Proceeding or in defense of any claim, issue
or matter therein, in whole or in part, the Company shall, to the fullest extent permitted by applicable law, indemnify, hold harmless and exonerate Indemnitee against all Expenses actually and reasonably incurred by Indemnitee in connection
therewith. If Indemnitee is not wholly successful in such Proceeding but is successful, on the merits or otherwise, as to one or more but less than all claims, issues or matters in such Proceeding, the Company shall, to the fullest extent permitted
by applicable law, indemnify, hold harmless and exonerate Indemnitee against all Expenses actually and reasonably incurred by Indemnitee or on Indemnitee’s behalf in connection with each successfully resolved claim, issue or matter. If
Indemnitee is not wholly successful in such Proceeding, the Company also shall, to the fullest extent permitted by applicable law, indemnify, hold harmless and exonerate Indemnitee against all Expenses reasonably incurred in connection with a claim,
issue or matter related to any claim, issue, or matter on which Indemnitee was successful. For purposes of this Section and without limitation, the termination of any claim, issue or matter in such a Proceeding by dismissal, with or without
prejudice, shall be deemed to be a successful result as to such claim, issue or matter. 
 6. INDEMNIFICATION FOR EXPENSES OF A
WITNESS. Notwithstanding any other provision of this Agreement except for Section 27, to the extent that Indemnitee is, by reason of Indemnitee’s Corporate Status, a witness or deponent in any Proceeding to which Indemnitee was or is
not a party or threatened to be made a party, Indemnitee shall, to the fullest extent permitted by applicable law, be indemnified, held harmless and exonerated against all Expenses actually and reasonably incurred by Indemnitee or on
Indemnitee’s behalf in connection therewith. 

  
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 7. ADDITIONAL INDEMNIFICATION, HOLD HARMLESS AND EXONERATION RIGHTS.
Notwithstanding any limitation in Sections 3, or 5 and except for Section 27, the Company shall, to the fullest extent permitted by applicable law, indemnify, hold harmless and exonerate Indemnitee if Indemnitee is a party to or threatened
to be made a party to any Proceeding (including a Proceeding by or in the right of the Company to procure a judgment in its favor) against all Expenses, judgments, liabilities, fines, penalties and amounts paid in settlement (including all interest,
assessments and other charges paid or payable in connection with or in respect of such Expenses, judgments, liabilities, fines, penalties and amounts paid in settlement) actually and reasonably incurred by Indemnitee in connection with the
Proceeding. 
 8. CONTRIBUTION IN THE EVENT OF JOINT LIABILITY. 

(a) To the fullest extent permissible under applicable law, if the indemnification, hold harmless and/or exoneration rights provided for in
this Agreement are unavailable to Indemnitee in whole or in part for any reason whatsoever, the Company, in lieu of indemnifying, holding harmless or exonerating Indemnitee, shall pay, in the first instance, the entire amount incurred by Indemnitee,
whether for judgments, liabilities, fines, penalties, amounts paid or to be paid in settlement and/or for Expenses, in connection with any Proceeding without requiring Indemnitee to contribute to such payment, and the Company hereby waives and
relinquishes any right of contribution it may have at any time against Indemnitee. 
 (b) The Company shall not enter into any settlement of
any Proceeding in which the Company is jointly liable with Indemnitee (or would be if joined in such Proceeding) unless such settlement provides for a full and final release of all claims asserted against Indemnitee. 

(c) The Company hereby agrees to fully indemnify, hold harmless and exonerate Indemnitee from any claims for contribution which may be brought
by officers, directors or employees of the Company other than Indemnitee who may be jointly liable with Indemnitee. Indemnitee shall seek payments or advances from the Company only to the extent that such payments or advances are unavailable from
any insurance policy of the Company covering Indemnitee. 
 9. JOINTLY INDEMNIFIABLE CLAIMS. 

Except as set forth in Section 27, given that certain Jointly Indemnifiable Claims may arise due to the relationship between the
Indemnitee- Related Entities and the Company and the service of the Indemnitee as a director and/or officer of the Company, the Company acknowledges and agrees that the Company shall be fully and primarily responsible for the payment to the
Indemnitee in respect of indemnification and advancement of expenses in connection with any such Jointly Indemnifiable Claim, pursuant to and in accordance with the terms of this Agreement, irrespective of any right of recovery the Indemnitee may
have from the Indemnitee-Related Entities. Notwithstanding anything contained herein to the contrary, under no circumstance shall the Company be entitled to any right of subrogation or contribution by the Indemnitee-Related Entities and no right of
recovery the Indemnitee may have from the Indemnitee-Related Entities shall reduce or otherwise alter the rights of the Indemnitee or the obligations of the Company hereunder. In the event that any of the Indemnitee-Related Entities


  
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shall make any payment to the Indemnitee in respect of indemnification or advancement of Expenses with respect to any Jointly Indemnifiable Claim, the Company agrees that such payment or
advancement shall not extinguish or affect in any way the rights of the Indemnitee under this Agreement and further agrees that the Indemnitee-Related Entity making such payment shall be subrogated to the extent of such payment to all of the rights
of recovery of the Indemnitee against the Company. Each of the Indemnitee-Related Entities shall be third-party beneficiaries with respect to this Section 9, entitled to enforce this Section 9 against the Company as though each such
Indemnitee-Related Entity were a party to this Agreement. 
 10. ADVANCES OF EXPENSES; DEFENSE OF CLAIM. 

(a) Notwithstanding any provision of this Agreement to the contrary, except for Section 27, and to the fullest extent not prohibited by
applicable law, the Company shall pay the Expenses incurred by Indemnitee (or reasonably expected by Indemnitee to be incurred by Indemnitee within three months) in connection with any Proceeding within ten (10) days after the receipt by the
Company of a statement or statements requesting such advances from time to time, prior to the final disposition of any Proceeding. Advances shall, to the fullest extent permitted by law, be unsecured and interest free. Advances shall, to the fullest
extent permitted by law, be made without regard to Indemnitee’s ability to repay the Expenses and without regard to Indemnitee’s ultimate entitlement to be indemnified, held harmless or exonerated under the other provisions of this
Agreement. Advances shall include any and all reasonable Expenses incurred pursuing a Proceeding to enforce this right of advancement, including Expenses incurred preparing and forwarding statements to the Company to support the advances claimed. To
the fullest extent required by applicable law, such payments of Expenses in advance of the final disposition of the Proceeding shall be made only upon the Company’s receipt of an undertaking, by or on behalf of Indemnitee, to repay the advanced
amounts to the extent that it is ultimately determined that Indemnitee is not entitled to be indemnified, held harmless or exonerated by the Company under the provisions of this Agreement, the Charter, the Bylaws, applicable law or otherwise. 

(b) The Company will be entitled to participate in the Proceeding at its own expense. 

(c) The Company shall not settle any action, claim or Proceeding (in whole or in part) which would impose any Expense, judgment, liability,
fine, penalty or limitation on Indemnitee without Indemnitee’s prior written consent. 
 11. PROCEDURE FOR NOTIFICATION AND
APPLICATION FOR INDEMNIFICATION; EXCLUSION. 
 (a) Indemnitee agrees to notify promptly the Company in writing upon being served with
any summons, citation, subpoena, complaint, indictment, information or other document relating to any Proceeding, claim, issue or matter therein which may be subject to indemnification, hold harmless or exoneration rights, or advancement of Expenses
covered hereunder. The failure of Indemnitee to so notify the Company shall not relieve the Company of any obligation which it may have to Indemnitee under this Agreement, or otherwise. 

  
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 (b) Indemnitee may deliver to the Company a written application to indemnify, hold harmless
or exonerate Indemnitee in accordance with this Agreement. Such application(s) may be delivered from time to time and at such time(s) as Indemnitee deems appropriate in his or her sole discretion. Following such a written application for
indemnification by Indemnitee, Indemnitee’s entitlement to indemnification shall be determined according to Section 12(a) of this Agreement. 

(c) Notwithstanding anything in this Agreement to the contrary, except as set forth in Sections 14(f) and (g), prior to a Change of Control,
the Company shall not be obligated under this Agreement to make any indemnification, advance Expenses, hold harmless or exoneration payment in connection with any Proceeding (or any part of any Proceeding) initiated by Indemnitee, including any
Proceeding (or any part of any Proceeding) initiated by Indemnitee against the Company or its directors, officers, employees or other indemnitees, unless (i) the Board authorized the Proceeding prior to its initiation or (ii) the
Proceeding is one to enforce Indemnitee’s rights under this Agreement. 
 12. PROCEDURE UPON APPLICATION FOR INDEMNIFICATION.

 (a) A determination, if required by applicable law, with respect to Indemnitee’s entitlement to indemnification shall be made in the
specific case by one of the following methods: (i) if no Change in Control has occurred (x) by a majority vote of the Disinterested Directors, even though less than a quorum of the Board, (y) by a committee of Disinterested Directors,
even though less than a quorum of the Board, or (z) if there are no Disinterested Directors, or if such Disinterested Directors so direct, by Independent Counsel in a written opinion to the Board, a copy of which shall be delivered to
Indemnitee; or (ii) if a Change in Control has occurred, by Independent Counsel in a written opinion to the Board, a copy of which shall be delivered to Indemnitee. The Company promptly will advise Indemnitee in writing with respect to any
determination that Indemnitee is or is not entitled to indemnification, including a description of any reason or basis for which indemnification has been denied. If it is so determined that Indemnitee is entitled to indemnification, payment to
Indemnitee shall be made within ten (10) days after such determination. Indemnitee shall reasonably cooperate with the person, persons or entity making such determination with respect to Indemnitee’s entitlement to indemnification,
including providing to such person, persons or entity upon reasonable advance request any documentation or information which is not privileged or otherwise protected from disclosure and which is reasonably available to Indemnitee and reasonably
necessary to such determination. Any costs or Expenses incurred by Indemnitee in so cooperating with the person, persons or entity making such determination shall be borne by the Company (irrespective of the determination as to Indemnitee’s
entitlement to indemnification) and the Company hereby agrees to indemnify and to hold Indemnitee harmless therefrom. 
 (b) In the event
the determination of entitlement to indemnification is to be made by Independent Counsel pursuant to Section 12(a) hereof, the Independent Counsel shall be selected as provided in this Section 12(b). The Independent Counsel shall be
selected by Indemnitee (unless Indemnitee shall request that such selection be made by the Board), and Indemnitee shall give written notice to the Company advising it of the identity of the Independent Counsel so selected and certifying that the
Independent Counsel so selected meets 

  
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the requirements of “Independent Counsel” as defined in Section 2 of this Agreement. If the Independent Counsel is selected by the Board, the Company shall give written notice to
Indemnitee advising Indemnitee of the identity of the Independent Counsel so selected and certifying that the Independent Counsel so selected meets the requirements of “Independent Counsel” as defined in Section 2 of this Agreement.
In either event, Indemnitee or the Company, as the case may be, may, within ten (10) days after such written notice of selection shall have been received, deliver to the Company or to Indemnitee, as the case may be, a written objection to such
selection; provided, however, that such objection may be asserted only on the ground that the Independent Counsel so selected does not meet the requirements of “Independent Counsel” as defined in Section 2 of this Agreement, and the
objection shall set forth with particularity the factual basis of such assertion. Absent a proper and timely objection, the person so selected shall act as Independent Counsel. If such written objection is so made and substantiated, the Independent
Counsel so selected may not serve as Independent Counsel unless and until such objection is withdrawn or a court of competent jurisdiction has determined that such objection is without merit. If, within twenty (20) days after submission by
Indemnitee of a written request for indemnification pursuant to Section 11(b) hereof, no Independent Counsel shall have been selected and not objected to, either the Company or Indemnitee may petition the Delaware Court for resolution of any
objection which shall have been made by the Company or Indemnitee to the other’s selection of Independent Counsel and/or for the appointment as Independent Counsel of a person selected by the Delaware Court, and the person with respect to whom
all objections are so resolved or the person so appointed shall act as Independent Counsel under Section 12 (a) hereof. Upon the due commencement of any judicial proceeding or arbitration pursuant to Section 14(a) of this Agreement,
Independent Counsel shall be discharged and relieved of any further responsibility in such capacity (subject to the applicable standards of professional conduct then prevailing). 

(c) The Company agrees to pay the reasonable fees and expenses of Independent Counsel and to fully indemnify and hold harmless such
Independent Counsel against any and all Expenses, claims, liabilities and damages arising out of or relating to this Agreement or its engagement pursuant hereto. 

13. PRESUMPTIONS AND EFFECT OF CERTAIN PROCEEDINGS. 

(a) In making a determination with respect to entitlement to indemnification hereunder, the person, persons or entity making such
determination shall presume that Indemnitee is entitled to indemnification under this Agreement if Indemnitee has submitted a request for indemnification in accordance with Section 11(b) of this Agreement, and the Company shall have the burden
of proof to overcome that presumption in connection with the making by any person, persons or entity of any determination contrary to that presumption. Neither the failure of the Company (including by the Disinterested Directors or Independent
Counsel) to have made a determination prior to the commencement of any action pursuant to this Agreement that indemnification is proper in the circumstances because Indemnitee has met the applicable standard of conduct, nor an actual determination
by the Company (including by the Disinterested Directors or Independent Counsel) that Indemnitee has not met such applicable standard of conduct, shall be a defense to the action or create a presumption that Indemnitee has not met the applicable
standard of conduct. 

  
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 (b) If the person, persons or entity empowered or selected under Section 12 of this
Agreement to determine whether Indemnitee is entitled to indemnification shall not have made a determination within thirty (30) days after receipt by the Company of the request therefor, the requisite determination of entitlement to
indemnification shall, to the fullest extent permitted by law, be deemed to have been made and Indemnitee shall be entitled to such indemnification, absent (i) a misstatement by Indemnitee of a material fact, or an omission of a material fact
necessary to make Indemnitee’s statement not materially misleading, in connection with the request for indemnification, or (ii) a final judicial determination that any or all such indemnification is expressly prohibited under applicable
law; provided, however, that such 30-day period may be extended for a reasonable time, not to exceed an additional fifteen (15) days, if the person, persons or entity making the determination with respect
to entitlement to indemnification in good faith requires such additional time for the obtaining or evaluating of documentation and/or information relating thereto. 

(c) The termination of any Proceeding or of any claim, issue or matter therein, by judgment, order, settlement (whether with or without court
approval) or conviction, or upon a plea of nolo contendere or its equivalent, shall not of itself adversely affect the right of Indemnitee to indemnification or create a presumption that Indemnitee did not meet any particular standard of conduct or
have any particular belief or that a court has determined that indemnification is not permitted by applicable law. In addition, neither the failure of the Independent Counsel to have made a determination as to whether Indemnitee has met any
particular standard of conduct or had any particular belief, nor an actual determination by the Independent Counsel that Indemnitee has not met such standard of conduct or did not have such belief, prior to the commencement of legal proceedings by
Indemnitee to secure a judicial determination that Indemnitee should be indemnified under applicable law shall be a defense to Indemnitee’s claim or create a presumption that Indemnitee has not met any particular standard of conduct or did not
have any particular belief. 
 (d) For purposes of any determination of good faith, Indemnitee shall be deemed to have acted in good faith
and in a manner he or she reasonably believed to be in or not opposed to the best interests of the Company if Indemnitee’s actions or omissions to act are taken in good faith reliance upon the records or books of account of the Enterprise,
including financial statements, or on information supplied to Indemnitee by the directors, trustees, general partners, managers or managing members of the Enterprise in the course of their duties, or on the advice of legal counsel for the
Enterprise, its Board, any committee of the Board or any director, trustee, general partner, manager or managing member of the Enterprise, or on information or records given or reports made to the Enterprise, its Board, any committee of the Board or
any director, trustee, general partner, manager or managing member of the Enterprise, by an independent certified public accountant or by an appraiser or other expert selected by the Enterprise, its Board, any committee of the Board or any director,
trustee, general partner, manager or managing member. The provisions of this Section 13(d) shall not be deemed to be exclusive or to limit in any way the other circumstances in which Indemnitee may be deemed or found to have met the applicable
standard of conduct set forth in this Agreement. 
 (e) The knowledge and/or actions, or failure to act, of any other director, officer,
trustee, partner, manager, managing member, fiduciary, agent or employee of the Enterprise shall not be imputed to Indemnitee for purposes of determining the right to indemnification under this Agreement. 

  
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 14. REMEDIES OF INDEMNITEE. 

(a) In the event that (i) a determination is made pursuant to Section 12 of this Agreement that Indemnitee is not entitled to
indemnification under this Agreement, (ii) advancement of Expenses, to the fullest extent permitted by applicable law, is not timely made pursuant to Section 10 of this Agreement, (iii) no determination of entitlement to
indemnification shall have been made pursuant to Section 12(a) of this Agreement within thirty (30) days after receipt by the Company of the request for indemnification, (iv) payment of indemnification is not made pursuant to
Section 5, 6, 7 or the last sentence of Section 12(a) of this Agreement within ten (10) days after receipt by the Company of a written request therefor, (v) a contribution payment is not made in a timely manner pursuant to
Section 8 of this Agreement, (vi) payment of indemnification pursuant to Section 3 or 4 of this Agreement is not made within ten (10) days after a determination has been made that Indemnitee is entitled to indemnification, or
(vii) payment to Indemnitee pursuant to any hold harmless or exoneration rights under this Agreement or otherwise is not made in accordance with this Agreement, Indemnitee shall be entitled to an adjudication by the Delaware Court to such
indemnification, hold harmless, exoneration, contribution or advancement rights. Alternatively, Indemnitee, at Indemnitee’s option, may seek an award in arbitration to be conducted by a single arbitrator pursuant to the Commercial Arbitration
Rules and Mediation Procedures of the American Arbitration Association. Except as set forth herein, the provisions of Delaware law (without regard to its conflict of laws rules) shall apply to any such arbitration. The Company shall not oppose
Indemnitee’s right to seek any such adjudication or award in arbitration. 
 (b) In the event that a determination shall have been made
pursuant to Section 12(a) of this Agreement that Indemnitee is not entitled to indemnification, any judicial proceeding or arbitration commenced pursuant to this Section 14 shall be conducted in all respects as a de novo trial, or
arbitration, on the merits and Indemnitee shall not be prejudiced by reason of that adverse determination. 
 (c) In any judicial proceeding
or arbitration commenced pursuant to this Section 14, Indemnitee shall be presumed to be entitled to be indemnified, held harmless, and exonerated and to receive advancement of Expenses under this Agreement and the Company shall have the burden
of proving Indemnitee is not entitled to be indemnified, held harmless, and exonerated and to receive advancement of Expenses, as the case may be, and the Company may not refer to or introduce into evidence any determination pursuant to
Section 12(a) of this Agreement adverse to Indemnitee for any purpose. If Indemnitee commences a judicial proceeding or arbitration pursuant to this Section 14, Indemnitee shall not be required to reimburse the Company for any advances
pursuant to Section 10 until a final determination is made with respect to Indemnitee’s entitlement to indemnification (as to which all rights of appeal have been exhausted or lapsed). 

(d) If a determination shall have been made pursuant to Section 12(a) of this Agreement that Indemnitee is entitled to indemnification,
the Company shall be bound by such determination in any judicial proceeding or arbitration commenced pursuant to this Section 14, absent (i) a misstatement by Indemnitee of a material fact, or an omission of a material fact necessary to
make Indemnitee’s statement not materially misleading, in connection with the request for indemnification, or (ii) a prohibition of such indemnification under applicable law. 

  
 12 













 (e) The Company shall be precluded from asserting in any judicial proceeding or arbitration
commenced pursuant to this Section 14 that the procedures and presumptions of this Agreement are not valid, binding and enforceable and shall stipulate in any such court or before any such arbitrator that the Company is bound by all the
provisions of this Agreement. 
 (f) The Company shall indemnify and hold harmless Indemnitee to the fullest extent permitted by law against
all Expenses and, if requested by Indemnitee, shall (within ten (10) days after the Company’s receipt of such written request) pay to Indemnitee, to the fullest extent permitted by applicable law, such Expenses which are incurred by
Indemnitee in connection with any judicial proceeding or arbitration brought by Indemnitee: (i) to enforce his or her rights under, or to recover damages for breach of, this Agreement or any other indemnification, hold harmless, exoneration,
advancement or contribution agreement or provision of the Charter, or the Bylaws now or hereafter in effect; or (ii) for recovery or advances under any insurance policy maintained by any person for the benefit of Indemnitee, regardless of the
outcome and whether Indemnitee ultimately is determined to be entitled to such indemnification, hold harmless or exoneration right, advancement, contribution or insurance recovery, as the case may be (unless such judicial proceeding or arbitration
was not brought by Indemnitee in good faith). 
 (g) Interest shall be paid by the Company to Indemnitee at the legal rate under Delaware
law for amounts which the Company indemnifies, holds harmless or exonerates, or advances, or is obliged to indemnify, hold harmless or exonerate or advance for the period commencing with the date on which Indemnitee requests indemnification, to be
held harmless, exonerated, contribution, reimbursement or advancement of any Expenses and ending with the date on which such payment is made to Indemnitee by the Company. 

15. SECURITY. Notwithstanding anything herein to the contrary, except for Section 27, to the extent requested by Indemnitee and
approved by the Board, the Company may at any time and from time to time provide security to Indemnitee for the Company’s obligations hereunder through an irrevocable bank line of credit, funded trust or other collateral. Any such security,
once provided to Indemnitee, may not be revoked or released without the prior written consent of Indemnitee. 
 16. NON-EXCLUSIVITY; SURVIVAL OF RIGHTS; INSURANCE; SUBROGATION; PRIORITY OF OBLIGATIONS. 
 (a) The
rights of Indemnitee as provided by this Agreement shall not be deemed exclusive of any other rights to which Indemnitee may at any time be entitled under applicable law, the Charter, the Bylaws, any agreement, a vote of stockholders or a resolution
of directors, or otherwise. No amendment, alteration or repeal of this Agreement or of any provision hereof shall limit or restrict any right of Indemnitee under this Agreement in respect of any Proceeding (regardless of when such Proceeding is
first threatened, commenced or completed) or claim, issue or matter therein arising out of, or related to, any action taken or 

  
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omitted by such Indemnitee in Indemnitee’s Corporate Status prior to such amendment, alteration or repeal. To the extent that a change in applicable law, whether by statute or judicial
decision, permits greater indemnification, hold harmless or exoneration rights or advancement of Expenses than would be afforded currently under the Charter, the Bylaws or this Agreement, then this Agreement shall automatically be deemed to be
amended to require that the Company indemnify the Indemnitee to the fullest extent permitted by law. No right or remedy herein conferred is intended to be exclusive of any other right or remedy, and every other right and remedy shall be cumulative
and in addition to every other right and remedy given hereunder or now or hereafter existing at law or in equity or otherwise. The assertion or employment of any right or remedy hereunder, or otherwise, shall not prevent the concurrent assertion or
employment of any other right or remedy. 
 (b) The DGCL, the Charter and the Bylaws permit the Company to purchase and maintain insurance
or furnish similar protection or make other arrangements including, but not limited to, providing a trust fund, letter of credit, or surety bond (“Indemnification Arrangements”) on behalf of Indemnitee against any liability
asserted against Indemnitee or incurred by or on behalf of Indemnitee or in such capacity as a director, officer, employee or agent of the Company, or arising out of Indemnitee’s status as such, whether or not the Company would have the power
to indemnify Indemnitee against such liability under the provisions of this Agreement or under the DGCL, as it may then be in effect. The purchase, establishment, and maintenance of any such Indemnification Arrangement shall not in any way limit or
affect the rights and obligations of the Company or of Indemnitee under this Agreement except as expressly provided herein, and the execution and delivery of this Agreement by the Company and Indemnitee shall not in any way limit or affect the
rights and obligations of the Company or the other party or parties thereto under any such Indemnification Arrangement. 
 (c) To the extent
that the Company maintains an insurance policy or policies providing liability insurance for directors, officers, trustees, partners, managers, managing members, fiduciaries, employees, or agents of the Company or of any other Enterprise which such
person serves at the request of the Company, Indemnitee shall be covered by such policy or policies in accordance with its or their terms to the maximum extent of the coverage available for any such director, officer, trustee, partner, managers,
managing member, fiduciary, employee or agent under such policy or policies. If, at the time the Company receives notice from any source of a Proceeding as to which Indemnitee is a party or a participant (as a witness, deponent or otherwise), the
Company has director and officer liability insurance in effect, the Company shall give prompt notice of such Proceeding to the insurers in accordance with the procedures set forth in the respective policies. The Company shall thereafter take all
necessary or desirable action to cause such insurers to pay, on behalf of Indemnitee, all amounts payable as a result of such Proceeding in accordance with the terms of such policies. 

(d) In the event of any payment under this Agreement, the Company, to the fullest extent permitted by law, shall be subrogated to the extent
of such payment to all of the rights of recovery of Indemnitee, who shall execute all papers required and take all action necessary to secure such rights, including execution of such documents as are necessary to enable the Company to bring suit to
enforce such rights. No such payment by the Company shall be deemed to relieve any insurer of its obligations. 

  
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 (e) The Company’s obligation to indemnify, hold harmless, exonerate or advance Expenses
hereunder to Indemnitee who is or was serving at the request of the Company as a director, officer, trustee, partner, manager, managing member, fiduciary, employee or agent of any other Enterprise shall be reduced by any amount Indemnitee has
actually received as indemnification, hold harmless or exoneration payments or advancement of expenses from such Enterprise. Notwithstanding any other provision of this Agreement to the contrary except for Section 27, (i) Indemnitee shall have
no obligation to reduce, offset, allocate, pursue or apportion any indemnification, hold harmless, exoneration, advancement, contribution or insurance coverage among multiple parties possessing such duties to Indemnitee prior to the Company’s
satisfaction and performance of all its obligations under this Agreement, and (ii) the Company shall perform fully its obligations under this Agreement without regard to whether Indemnitee holds, may pursue or has pursued any indemnification,
advancement, hold harmless, exoneration, contribution or insurance coverage rights against any person or entity other than the Company. 

(f) Notwithstanding anything contained herein, the Company is the primary indemnitor. 

17. DURATION OF AGREEMENT. All agreements and obligations of the Company contained herein shall continue during the period Indemnitee
serves as a director or officer of the Company or as a director, officer, trustee, partner, manager, managing member, fiduciary, employee or agent of any other corporation, partnership, joint venture, trust, employee benefit plan or other Enterprise
which Indemnitee serves at the request of the Company and shall continue thereafter so long as Indemnitee shall be subject to any possible Proceeding (including any rights of appeal thereto and any Proceeding commenced by Indemnitee pursuant to
Section 14 of this Agreement) by reason of Indemnitee’s Corporate Status, whether or not Indemnitee is acting in any such capacity at the time any liability or expense is incurred for which indemnification or advancement can be provided
under this Agreement. 
 18. SEVERABILITY. If any provision or provisions of this Agreement shall be held to be invalid, illegal or
unenforceable for any reason whatsoever: (a) the validity, legality and enforceability of the remaining provisions of this Agreement (including, without limitation, each portion of any Section, paragraph or sentence of this Agreement containing
any such provision held to be invalid, illegal or unenforceable, that is not itself invalid, illegal or unenforceable) shall not in any way be affected or impaired thereby and shall remain enforceable to the fullest extent permitted by law;
(b) such provision or provisions shall be deemed reformed to the extent necessary to conform to applicable law and to give the maximum effect to the intent of the parties hereto; and (c) to the fullest extent possible, the provisions of
this Agreement (including, without limitation, each portion of any Section, paragraph or sentence of this Agreement containing any such provision held to be invalid, illegal or unenforceable, that is not itself invalid, illegal or unenforceable)
shall be construed so as to give effect to the intent manifested thereby. 
 19. ENFORCEMENT AND BINDING EFFECT. 

(a) The Company expressly confirms and agrees that it has entered into this Agreement and assumed the obligations imposed on it hereby in
order to induce Indemnitee to serve as a director, officer or key employee of the Company, and the Company acknowledges that Indemnitee is relying upon this Agreement in serving as a director, officer or key employee of the Company. 

  
 15 













 (b) Without limiting any of the rights of Indemnitee under the Charter or Bylaws as they may
be amended from time to time, this Agreement constitutes the entire agreement between the parties hereto with respect to the subject matter hereof and supersedes all prior agreements and understandings, oral, written and implied, between the parties
hereto with respect to the subject matter hereof. 
 (c) The indemnification, hold harmless, exoneration and advancement of expenses rights
provided by or granted pursuant to this Agreement shall be binding upon and be enforceable by the parties hereto and their respective successors and assigns (including any direct or indirect successor by purchase, merger, consolidation or otherwise
to all or substantially all of the business and/or assets of the Company), shall continue as to an Indemnitee who has ceased to be a director, officer, employee or agent of the Company or a director, officer, trustee, general partner, manager,
managing member, fiduciary, employee or agent of any other Enterprise at the Company’s request, and shall inure to the benefit of Indemnitee and Indemnitee’s spouse, assigns, heirs, devisees, executors and administrators and other legal
representatives.(d) The Company shall require and cause any successor (whether direct or indirect by purchase, merger, consolidation or otherwise) to all, substantially all or a substantial part, of the business and/or assets of the Company, by
written agreement in form and substance satisfactory to Indemnitee, expressly to assume and agree to perform this Agreement in the same manner and to the same extent that the Company would be required to perform if no such succession had taken
place. 
 (d) The Company and Indemnitee agree herein that a monetary remedy for breach of this Agreement, at some later date, may be
inadequate, impracticable and difficult of proof, and further agree that such breach may cause Indemnitee irreparable harm. Accordingly, the parties hereto agree that Indemnitee may, to the fullest extent permitted by law, enforce this Agreement by
seeking, among other things, injunctive relief and/or specific performance hereof, without any necessity of showing actual damage or irreparable harm and that by seeking injunctive relief and/or specific performance, Indemnitee shall not be
precluded from seeking or obtaining any other relief to which Indemnitee may be entitled. The Company and Indemnitee further agree that Indemnitee shall, to the fullest extent permitted by law, be entitled to such specific performance and injunctive
relief, including temporary restraining orders, preliminary injunctions and permanent injunctions, without the necessity of posting bonds or other undertaking in connection therewith. The Company acknowledges that in the absence of a waiver, a bond
or undertaking may be required of Indemnitee by a court of competent jurisdiction. The Company hereby waives any such requirement of such a bond or undertaking to the fullest extent permitted by law. 

20. MODIFICATION AND WAIVER. No supplement, modification or amendment of this Agreement shall be binding unless executed in writing by
the Company and Indemnitee. No waiver of any of the provisions of this Agreement shall be deemed or shall constitute a waiver of any other provisions of this Agreement nor shall any waiver constitute a continuing waiver. 

  
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 21. NOTICES. All notices, requests, demands and other communications under this
Agreement shall be in writing and shall be deemed to have been duly given (i) if delivered by hand and receipted for by the party to whom said notice or other communication shall have been directed on such delivery, or (ii) mailed by
certified or registered mail with postage prepaid, on the third (3rd) business day after the date on which it is so mailed: 
 (a) If to
Indemnitee, at the address indicated on the signature page of this Agreement, or such other address as Indemnitee shall provide in writing to the Company. 

(b) If to the Company, to: 
 M3-Brigade Acquisition III Corp. 
 1700 Broadway – 19th Floor 

New York, NY 10019 
 Attention:
Charles Garner at cgarner@m3-partners.com 
 With a copy, which shall not constitute notice,
to 
 Paul, Weiss, Rifkind, Wharton & Garrison LLP 

1285 Avenue of the Americas 

New York, NY 10019 
 Attn: David
A. Curtiss, Esq. 
 or to any other address as may have been furnished to Indemnitee in writing by the Company. 

22. APPLICABLE LAW AND CONSENT TO JURISDICTION. This Agreement and the legal relations among the parties shall be governed by, and
construed and enforced in accordance with, the laws of the State of Delaware, without regard to its conflict of laws rules. Except with respect to any arbitration commenced by Indemnitee pursuant to Section 14(a) of this Agreement, to the
fullest extent permitted by law, the Company and Indemnitee hereby irrevocably and unconditionally: (a) agree that any action or proceeding arising out of or in connection with this Agreement shall be brought only in the Delaware Court and not
in any other state or federal court in the United States of America or any court in any other country; (b) consent to submit to the exclusive jurisdiction of the Delaware Court for purposes of any action or proceeding arising out of or in
connection with this Agreement; (c) waive any objection to the laying of venue of any such action or proceeding in the Delaware Court; and (d) waive, and agree not to plead or to make, any claim that any such action or proceeding brought
in the Delaware Court has been brought in an improper or inconvenient forum, or is subject (in whole or in part) to a jury trial. To the fullest extent permitted by law, the parties hereby agree that the mailing of process and other papers in
connection with any such action or proceeding in the manner provided by Section 21 or in such other manner as may be permitted by law, shall be valid and sufficient service thereof. 

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

  
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 24. MISCELLANEOUS. Use of the masculine pronoun shall be deemed to include usage of
the feminine pronoun where appropriate. The headings of the paragraphs of this Agreement are inserted for convenience only and shall not be deemed to constitute part of this Agreement or to affect the construction thereof. 

25. PERIOD OF LIMITATIONS. No legal action shall be brought and no cause of action shall be asserted by or in the right of the Company
against Indemnitee, Indemnitee’s spouse, heirs, executors or personal or legal representatives after the expiration of two years from the date of accrual of such cause of action, and any claim or cause of action of the Company shall be
extinguished and deemed released unless asserted by the timely filing of a legal action within such two-year period; provided, however, that if any shorter period of limitations is otherwise applicable to any
such cause of action such shorter period shall govern. 
 26. ADDITIONAL ACTS. If for the validation of any of the provisions in this
Agreement any act, resolution, approval or other procedure is required to the fullest extent permitted by law, the Company undertakes to cause such act, resolution, approval or other procedure to be affected or adopted in a manner that will enable
the Company to fulfill its obligations under this Agreement. 
 27. WAIVER OF CLAIMS TO TRUST ACCOUNT. Notwithstanding anything
contained herein to the contrary, Indemnitee hereby agrees that it does not have any right, title, interest or claim of any kind (each, a “Claim”) in or to any monies in the trust account established in connection with the
Company’s initial public offering for the benefit of the Company and holders of shares issued in such offering, and hereby waives any Claim it may have in the future as a result of, or arising out of, any services provided to the Company and
will not seek recourse against such trust account for any reason whatsoever. Accordingly, Indemnitee acknowledges and agrees that any indemnification provided hereto will only be able to be satisfied by the Company if (i) the Company has
sufficient funds outside of the Trust Account to satisfy its obligations hereunder or (ii) the Company consummates a Business Combination. 

28. MAINTENANCE OF INSURANCE. The Company shall use commercially reasonable efforts to obtain and maintain in effect during the entire
period for which the Company is obligated to indemnify the Indemnitee under this Agreement, one or more policies of insurance with reputable insurance companies to provide the officers/directors of the Company with coverage for losses from wrongful
acts and omissions and to ensure the Company’s performance of its indemnification obligations under this Agreement. The Indemnitee shall be covered by such policy or policies in accordance with its or their terms to the maximum extent of the
coverage available for any such director or officer under such policy or policies. In all such insurance policies, the Indemnitee shall be named as an insured in such a manner as to provide the Indemnitee with the same rights and benefits as are
accorded to the most favorably insured of the Company’s directors and officers. 
 [Signature Page Follows] 

  
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 IN WITNESS WHEREOF, the parties hereto have caused this Indemnity Agreement to be
signed as of the day and year first above written. 
  

			
	M3-BRIGADE ACQUISITION III CORP.
		
	By:	 	/s/ Mohsin Meghji
		 	Name: Mohsin Meghji
		 	Title: Executive Chairman of the Board of Directors


 [Signature Page to Indemnity Agreement—Gallagher] 












 
			
	 INDEMNITEE
  

		
	By:	 	/s/ William Gallagher
		 	Name: William Gallagher
		 	Title: Executive Vice President
		 	 Address: 1700 Broadway – 19th Floor
 New
York, NY 10019



 [Signature Page to Indemnity Agreement—Gallagher]