Sec Form 3 Filing - Meghji Mohsin Y @ M3-Brigade Acquisition III Corp. - 2021-10-21

FORM 3 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person Meghji Mohsin Y 2. Issuer Name and Ticker or Trading Symbol M3-Brigade Acquisition III Corp. [ MBSC] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director X __ 10% Owner X __ Officer (give title below) _____ Other (specify below) Executive Chairman of BOD (Last) (First) (Middle) C/O M3-BRIGADE ACQUISITION III CORP., 1700 BROADWAY, 19TH FLOOR 3. Date of Earliest Transaction (MM/DD/YY) 10/21/2021 (Street) NEW YORK, NY10019 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Class B Common Stock ( 1 ) ( 1 ) ( 1 ) Class A Common Stock 7,503,750 ( 2 ) I ( 3 ) By M3-Brigade Sponsor III LP

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other Meghji Mohsin Y C/O M3-BRIGADE ACQUISITION III CORP. 1700 BROADWAY, 19TH FLOOR NEW YORK, NY10019 X X Executive Chairman of BOD Signatures /s/ Mohsin Y. Meghji 10/21/2021 Signature of Reporting Person Date

Explanation of Responses:

( 1 )As described in the issuer's registration statement on Form S-1 (File No. 333-256017) under the heading "Description of Securities-Founder Shares", the shares of Class B common stock, par value $0.0001 per share, will automatically convert into shares of Class A common stock, par value $0.0001 per share, of the issuer at the time of the issuer's initial business combination, or earlier at the option of the holder, on a one-for-one basis, subject to adjustment for share splits, share capitalizations, reorganizations, recapitalizations and the like, and certain anti-dilution rights and have no expiration date. ( 2 )The shares of Class B common stock beneficially owned by the reporting person include up to 978,750 shares that are subject to forfeiture to the extent the underwriters of the initial public offering of the issuer's securities do not exercise in full their over-allotment option as described in the issuer's registration statement. ( 3 )The securities reported herein are held by M3-Brigade Sponsor III LP (the "Sponsor"). The reporting person controls M3-Brigade Acquisition Partners III Corp., the general partner of the Sponsor, and as such has voting and investment discretion with respect to the securities held by the the Sponsor and may be deemed to have beneficial ownership of the securities held directly by the Sponsor. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these securities in this report shall not be deemed an admission of beneficial ownership of all of the reported securities for purposes of Section 16 or for any other purpose.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

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