# EDGAR Filing Document

**Accession Number:** 0002073926
**File Stem:** 0000950142-25-002953
**Filing Date:** 2025-11
**Character Count:** 14006
**Document Hash:** 6fecab296afaa0402b480496faf4ac47
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000950142-25-002953.hdr.sgml**: 20251112

**ACCESSION NUMBER**: 0000950142-25-002953

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13G

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20251112

**DATE AS OF CHANGE**: 20251112

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** M3-Brigade Acquisition VI Corp.
- **CENTRAL INDEX KEY:** 0002073928
- **STANDARD INDUSTRIAL CLASSIFICATION:** BLANK CHECKS [6770]
- **ORGANIZATION NAME:** 05 Real Estate & Construction
- **EIN:** 000000000
- **STATE OF INCORPORATION:** E9
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13G
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-95324
- **FILM NUMBER:** 251475146

**BUSINESS ADDRESS:**
- **STREET 1:** 1700 BROADWAY, 19TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10019
- **BUSINESS PHONE:** 212-202-2200

**MAIL ADDRESS:**
- **STREET 1:** 1700 BROADWAY, 19TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10019
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** M3-Brigade Sponsor VI LLC
- **CENTRAL INDEX KEY:** 0002073926

**ORGANIZATION NAME:**
- **EIN:** 392610305
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13G

**BUSINESS ADDRESS:**
- **STREET 1:** 1700 BROADWAY, 19TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10019
- **BUSINESS PHONE:** 212-202-2200

**MAIL ADDRESS:**
- **STREET 1:** 1700 BROADWAY, 19TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10019

## Exhibit 99.1

**EXHIBIT 99.1**

**JOINT FILING AGREEMENT<br> PURSUANT TO RULE 13d-1(k)**

The undersigned acknowledge and agree that the foregoing statement on Schedule 13G is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13G shall be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning him or it contained herein and therein, but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that he or it knows or has reason to believe that such information is inaccurate.

DATE: November 12, 2025

---

| | |
|:---|:---|
| **M3-Brigade Sponsor VI LLC** | **M3-Brigade Sponsor VI LLC** |
| a Delaware limited liability company | a Delaware limited liability company |
| By: | M3-Brigade Acquisition Partners VI Corp., its managing member |
| By: | /s/ Mohsin Y. Meghji |
|  | Name: Mohsin Y. Meghji |
|  | Title: Authorized Person |
| **M3-Brigade Acquisition Partners VI Corp.** | **M3-Brigade Acquisition Partners VI Corp.** |
| a Delaware corporation | a Delaware corporation |
| By: | /s/ Mohsin Y. Meghji |
|  | Name: Mohsin Y. Meghji |
|  | Title: Authorized Person |
| **Mohsin Y. Meghji** | **Mohsin Y. Meghji** |
| By: | /s/ Mohsin Y. Meghji |
|  | Name: Mohsin Y. Meghji |

---

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13G

### Under the Securities Exchange Act of 1934

**Issuer:** M3-Brigade Acquisition VI Corp.

**Title of Class of Securities:** Class A Ordinary Shares, par value $0.0001

**CUSIP Number:** G63221108

**Date of Event Which Requires Filing of this Statement:** 09/30/2025

**Check the appropriate box to designate the rule pursuant to which this Schedule is filed:**

- [ ] Rule 13d-1(b)

- [ ] Rule 13d-1(c)

- [x] Rule 13d-1(d)

---

| 1. | Names of Reporting Persons<br>M3-Brigade Sponsor VI LLC | Names of Reporting Persons<br>M3-Brigade Sponsor VI LLC |
|:---|:---|:---|:---|
| 2. | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] |
| 3. | SEC Use Only | SEC Use Only |
| 4. | Citizenship or Place of Organization<br>DE | Citizenship or Place of Organization<br>DE |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>8625000.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>8625000.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>0.00 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>8625000.00 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>8625000.00 |
| 10. | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] |
| 11. | Percent of Class Represented by Amount in Row (9)<br>20.0% | Percent of Class Represented by Amount in Row (9)<br>20.0% |
| 12. | Type of Reporting Person (See Instructions)<br>OO | Type of Reporting Person (See Instructions)<br>OO |

---

| 1. | Names of Reporting Persons<br>M3-Brigade Acquisition Partners VI Corp. | Names of Reporting Persons<br>M3-Brigade Acquisition Partners VI Corp. |
|:---|:---|:---|:---|
| 2. | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] |
| 3. | SEC Use Only | SEC Use Only |
| 4. | Citizenship or Place of Organization<br>DE | Citizenship or Place of Organization<br>DE |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>8625000.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>8625000.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>0.00 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>8625000.00 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>8625000.00 |
| 10. | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] |
| 11. | Percent of Class Represented by Amount in Row (9)<br>20.0% | Percent of Class Represented by Amount in Row (9)<br>20.0% |
| 12. | Type of Reporting Person (See Instructions)<br>CO | Type of Reporting Person (See Instructions)<br>CO |

---

| 1. | Names of Reporting Persons<br>Mohsin Y. Meghji | Names of Reporting Persons<br>Mohsin Y. Meghji |
|:---|:---|:---|:---|
| 2. | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] |
| 3. | SEC Use Only | SEC Use Only |
| 4. | Citizenship or Place of Organization<br>X1 | Citizenship or Place of Organization<br>X1 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>8625000.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>8625000.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>0.00 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>8625000.00 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>8625000.00 |
| 10. | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] |
| 11. | Percent of Class Represented by Amount in Row (9)<br>20.0% | Percent of Class Represented by Amount in Row (9)<br>20.0% |
| 12. | Type of Reporting Person (See Instructions)<br>IN | Type of Reporting Person (See Instructions)<br>IN |

---

**Item 1(a). Name of Issuer:**
M3-Brigade Acquisition VI Corp.

**Item 1(b). Address of Issuer's Principal Executive Offices:**
1700 Broadway, 19th Floor, New York, NY 10019

**Item 2(a). Name of Person Filing:**
This statement is being filed on behalf of each of the following persons (each, a "Reporting Person" and, collectively, the "Reporting Persons"):

1. M3-Brigade Sponsor VI LLC
2. M3-Brigade Acquisition Partners VI Corp.
3. Mohsin Y. Meghji

**Item 2(b). Address of Principal Business Office:**
1700 Broadway, 19th Floor
New York, NY 10019

**Item 2(c). Citizenship:**
See row 4 of the cover page of each Reporting Person.

**Item 2(d). Title of Class of Securities:**
Class A Ordinary Shares, par value $0.0001

**Item 2(e). CUSIP Number:**
G63221108

**Item 3. If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:**

(a) [ ] Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o).

(b) [ ] Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

(c) [ ] Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).

(d) [ ] Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8).

(e) [ ] An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);

(f) [ ] An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);

(g) [ ] A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);

(h) [ ] A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

(i) [ ] A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);

(j) [ ] A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), if filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:

(k) [ ] Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).

**Item 4. Ownership:**

**(a) Amount beneficially owned:**

M3-Brigade Sponsor VI LLC (the "Sponsor") directly owns 8,625,000 Class B ordinary shares, par value $0.0001 per share ("Class B Ordinary Shares"), of M3-Brigade Acquisition VI Corp. (the "Issuer"), which are convertible into the Issuer's Class A ordinary shares, par value $0.0001 per share ("Class A Ordinary Shares"). Such shares may be deemed to be beneficially owned by M3-Brigade Acquisition Partners VI Corp. ("MBAP"), which is the general partner of the Sponsor, and Mohsin Y. Meghji, who is the sole director of MBAP. As a result of these relationships, each of the Sponsor, MBAP and Mr. Meghji may be deemed to have or share beneficial ownership of the securities held directly by the Sponsor. Each of the Sponsor, MBAP and Mr. Meghji disclaims beneficial ownership of such securities except to the extent of their direct ownership.
In addition to the securities reported on the cover pages hereto, the Sponsor also directly owns 4,333,333 private placement warrants to purchase 4,333,333 Class A Ordinary Shares. The warrants become exercisable beginning 30 days after the completion of the Issuer's initial business combination and expire five years after the completion of the Issuer's initial business combination or earlier upon redemption or liquidation.
Percentage ownership is based on 34,500,000 Class A Ordinary Shares outstanding as of October 8, 2025, as reported by the Issuer in its quarterly report on Form 10-Q for the period ended June 30, 2025, and 8,625,000 Class B Ordinary Shares directly owned by the Sponsor, and assumes conversion of such Class B Ordinary Shares into Class A Ordinary Shares.
See row 9 of the cover page of each Reporting Person.

**(b) Percent of class:**

See row 11 of the cover page of each Reporting Person.

**(c) Number of shares as to which the person has:**

**(i) Sole power to vote or to direct the vote:**

See row 5 of the cover page of each Reporting Person.

**(ii) Shared power to vote or to direct the vote:**

See row 6 of the cover page of each Reporting Person.

**(iii) Sole power to dispose or to direct the disposition of:**

See row 7 of the cover page of each Reporting Person.

**(iv) Shared power to dispose or to direct the disposition of:**

See row 8 of the cover page of each Reporting Person.

**Item 5. Ownership of Five Percent or Less of a Class.**

[x] If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following.

**Item 6. Ownership of More than 5 Percent on Behalf of Another Person.**

Not Applicable

**Item 7. Identification and Classification of the Subsidiary**

Not Applicable

**Item 8. Identification and Classification of Members of the Group**

Not Applicable

**Item 9. Notice of Dissolution of Group**

Not Applicable

**Item 10. Certification:**

—

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**M3-Brigade Sponsor VI LLC**

**Date:** 11/12/2025

**By:** /s/ Mohsin Y. Meghji

**Name & Title:** Mohsin Y. Meghji, Authorized Person

**M3-Brigade Acquisition Partners VI Corp.**

**Date:** 11/12/2025

**By:** /s/ Mohsin Y. Meghji

**Name & Title:** Mohsin Y. Meghji, Authorized Person

**Mohsin Y. Meghji**

**Date:** 11/12/2025

**By:** /s/ Mohsin Y. Meghji

**Name & Title:** Mohsin Y. Meghji