Polar Asset Management (MBAV) reports 3.81M shares; 13.3% stake (MBAV)

Rhea-AI Filing Summary

M3-Brigade Acquisition V Corp. ownership disclosure: Polar Asset Management Partners Inc. reports beneficial ownership of 3,812,849 Class A ordinary shares, representing 13.3% of the class. The filing states Polar acts as investment advisor to Polar Multi-Strategy Master Fund and holds sole voting and dispositive power over these shares. The statement is signed by the Chief Compliance Officer on 04/07/2026.

Insights

Governance Analyst

13.3% stake reported by an institutional advisor; routine disclosure under Schedule 13G/A.

Polar Asset Management Partners Inc. reports direct beneficial ownership of 3,812,849 Class A shares with sole voting and dispositive power, filed on Schedule 13G/A. The filing identifies Polar as adviser to Polar Multi-Strategy Master Fund.

Holding over 10% triggers public visibility; subsequent changes in position will require updated filings under applicable rules. Cash‑flow treatment or intended disposition is not stated in the excerpt.

Key Figures

Beneficial ownership: 3,812,849 shares Percent of class: 13.3% Filing signature date: 04/07/2026

3 metrics

Beneficial ownership 3,812,849 shares Amount beneficially owned as reported

Percent of class 13.3% Percent of Class A ordinary shares reported

Filing signature date 04/07/2026 Signed by Chief Compliance Officer

Key Terms

Schedule 13G/A, beneficially owned, sole dispositive power

3 terms

Schedule 13G/A regulatory

"This statement is filed by Polar Asset Management Partners Inc."

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

beneficially owned financial

"Amount beneficially owned: 3812849"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

sole dispositive power regulatory

"Sole power to dispose or to direct the disposition of: 3812849"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 04/07/2026 - 04:17 PM Learn about SEC filing dates

FAQ

What did Polar Asset Management report for MBAV?

Polar reported beneficial ownership of 3,812,849 Class A shares (13.3%). The filing states Polar is adviser to Polar Multi-Strategy Master Fund and has sole voting and dispositive power over the reported shares.

Does the Schedule 13G/A indicate Polar will sell MBAV shares?

The filing does not state any sale or disposition instructions. It only reports beneficial ownership and voting/dispositive powers; no trading intentions or cash‑flow treatment are disclosed in the provided excerpt.

Why is a 13.3% stake significant under SEC rules for MBAV?

Ownership above 10% requires public reporting and increases disclosure obligations. The Schedule 13G/A documents substantial passive or institutional holdings and makes future position changes visible to the market.

Who holds voting and disposition authority for the MBAV shares?

Polar Asset Management Partners Inc. reports sole voting and sole dispositive power for 3,812,849 shares. The statement attributes the holdings to Polar as adviser to the Polar Multi-Strategy Master Fund.

When was the Schedule 13G/A for MBAV signed and filed?

The signature on the excerpt is dated 04/07/2026. The filing header shows an amendment and includes the issuer CUSIP and class description dated 03/31/2026 in the cover information.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

M3-Brigade Acquisition V Corp.

(Name of Issuer)

Class A ordinary shares, par value $0.0001 per share

(Title of Class of Securities)

G63212107

(CUSIP Number)

03/31/2026

(Date of Event Which Requires Filing of this Statement)

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

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): G63212107

1

Names of Reporting Persons

Polar Asset Management Partners Inc.

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

ONTARIO, CANADA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 3,812,849.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 3,812,849.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,812,849.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

13.3 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: M3-Brigade Acquisition V Corp.
(b)	Address of issuer's principal executive offices: 1700 Broadway, 19th Floor, New York, New York, 10019
Item 2.
(a)	Name of person filing: This statement is filed by Polar Asset Management Partners Inc., a company incorporated under the laws of Ontario, Canada, which serves as the investment advisor to Polar Multi-Strategy Master Fund, a Cayman Islands exempted company ("PMSMF") with respect to the shares directly held by PMSMF.
(b)	Address or principal business office or, if none, residence: 16 York Street, Suite 2900, Toronto, Ontario, M5J 0E6
(c)	Citizenship: Canada
(d)	Title of class of securities: Class A ordinary shares, par value $0.0001 per share
(e)	CUSIP No.:
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).
	The Reporting Person is an investment fund manager, portfolio manager, exempt market dealer and commodity trading manager registered with the Ontario Securities Commission.
Item 4.	Ownership
(a)	Amount beneficially owned: 3812849
(b)	Percent of class: 13.3 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 3812849
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 3812849
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	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.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

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.

Polar Asset Management Partners Inc.

Signature:	Andrew Ma
Name/Title:	Chief Compliance Officer
Date:	04/07/2026