SEC Form 4

FORM 4		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 or Section 30(h) of the Investment Company Act of 1940	OMB APPROVAL OMB Number: 3235-0287 Estimated average burden hours per response: 0.5
	Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

1. Name and Address of Reporting Person* Meghji Mohsin Y (Last) (First) (Middle) 1700 BROADWAY, 19TH FLOOR (Street) NEW YORK NY 10019 (City) (State) (Zip)	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
	3. Date of Earliest Transaction (Month/Day/Year) 10/25/2021
	4. If Amendment, Date of Original Filed (Month/Day/Year)	6. Individual or Joint/Group Filing (Check Applicable Line) X Form filed by One Reporting Person Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	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 (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (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: 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)	10/25/2021		J(2)			3,750	(1)	(1)	Class A Common Stock	3,750	$0.00	7,500,000	I	See footnote(3)

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 will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination, or at any time prior thereto at the option of the holder, on a one-for-one basis, subject to certain adjustments described therein and have no expiration date.

2. On October 25, 2021, M3-Brigade Sponsor III LP (the "Sponsor") forfeited at no cost 3,750 shares of common stock, par value $0.0001 per share, in connection with the determination by the underwriters of the Issuer's initial public offering not to exercise in full the over-allotment option granted to them.

3. The reported shares of the Issuer are directly held by the Sponsor. The general partner of the Sponsor is M3-Brigade Acquisition Partners III Corp. Mohsin Meghji is the sole director of M3-Brigade Acquisition Partners III Corp. Mr. Meghji may be deemed to have beneficial ownership of the common stock held directly by the Sponsor.

	/s/ Mohsin Y. Meghji	10/27/2021
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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