Company: MBVI
Filing Date: 2025-08-04
Form Type: S-1
Source: 0001213900-25-071471
Chunk: 353

Company: M3-Brigade Acquisition VI Corp.
Filing Date: 2025-08-04
Form: S-1
Chunk 353
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                                 |     | Title:               |     | Executive Chairman |

POWER OF ATTORNEY KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature appears below constitutes and appoints each of Mohsin Y. Meghji and Charles Garner his true and lawful attorney -in-fact, with full power of substitution and resubstitution for him and in his name, place and stead, in any and all capacities to sign any and all amendments including post -effectiveamendments to this registration statement and any and all related registration statements filed pursuant to Rule 462 under the Securities Act of 1933, as amended, and to file the same, with all exhibits thereto, and other documents in connection therewith, with the SEC, hereby ratifying and confirming all that said attorney -in-factor his substitute, each acting alone, may lawfully do or cause to be done by virtue thereof. Pursuant to the requirements of the Securities Act of 1933, as amended, this Registration Statement has been signed below by the following persons in the capacities and on the dates indicated.

| Signature            
 /s/ Mohsin Y. Meghji |     | Title                                       
 Executive Chairman                          |     | Date           
 August 4, 2025 |
|:---------------------|:----|:--------------------------------------------|:----|:---------------|
| Mohsin Y. Meghji     |     | -Principal Executive Officer                |     |                |
| /s/ Eric Greenhaus   |     | Chief Financial Officer                     |     | August 4, 2025 |
| Eric Greenhaus       |     | -Principal Financial and Accounting Officer |     |                |
| /s/ Matthew Perkal   |     | Director                                    |     | August 4, 2025 |
| Matthew Perkal       |     |                                             |     |                |

II-4

AUTHORIZED REPRESENTATIVE Pursuant to the requirements of Section 6(a) of the Securities Act of 1933, the undersigned has signed this registration statement, solely in its capacity as the duly authorized representative of M3 -BrigadeAcquisition VI Corp., in New York, New York, on the 4 thday of August, 2025.

| M3-Brigade Acquisition VI Corp. |     |                      |     |                    |
| By:                             |     | /s/ Mohsin Y. Meghji |     |                    |
|                                 |     | Name:                |     | Mohsin Y