Highbridge Capital Management (MCAH) discloses 6.3% ownership in Mountain Crest Acquisition 6

Rhea-AI Filing Summary

Highbridge Capital Management, LLC, as investment adviser to certain funds and accounts, reports beneficial ownership of ordinary shares of Mountain Crest Acquisition 6 Corp. The holding covers 570,000 Ordinary Shares, representing 6.3% of the class, based on 9,047,143 Ordinary Shares outstanding as of June 1, 2026.

Highbridge has sole voting and dispositive power over these 570,000 shares and no shared power. The shares are directly held by Highbridge-advised funds, including Highbridge Tactical Credit Master Fund, L.P., which has rights over more than 5% of the outstanding Ordinary Shares.

Key Figures

Shares beneficially owned: 570,000 Ordinary Shares Percent of class: 6.3% Shares outstanding: 9,047,143 Ordinary Shares +2 more

5 metrics

Shares beneficially owned 570,000 Ordinary Shares Beneficial ownership reported by Highbridge Capital Management, LLC

Percent of class 6.3% Portion of Mountain Crest Acquisition 6 Corp. Ordinary Shares owned

Shares outstanding 9,047,143 Ordinary Shares Outstanding as of June 1, 2026, per issuer’s Form 10-Q

Sole voting power 570,000 Ordinary Shares Shares over which Highbridge has sole voting power

Sole dispositive power 570,000 Ordinary Shares Shares over which Highbridge has sole dispositive power

Key Terms

beneficial owner, sole voting power, sole dispositive power, percent of class, +1 more

5 terms

beneficial owner regulatory

"the beneficial owner of the securities reported herein"

A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.

sole voting power regulatory

"Sole Voting Power 570,000.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

sole dispositive power regulatory

"Sole Dispositive Power 570,000.00"

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.

percent of class financial

"Percent of class: 6.3%"

Percent of class is the portion of a specific category of securities—such as a company’s common shares, preferred shares, or a bond series—that takes part in or approves a corporate action (vote, consent, tender, etc.). Investors watch this number because it reveals how much support or opposition exists within that particular shareholder group; like counting how many members of a club back a proposal, it can determine whether a plan passes or how influence is distributed.

Schedule 13G regulatory

"This statement is filed by Highbridge Capital Management, LLC"

A Schedule 13G is a formal document that investors file with the government when they acquire a large ownership stake in a company, usually for investment purposes rather than control. It helps keep the public informed about who owns significant parts of a company's shares, which can influence how the company is managed and how investors make decisions. Filing this schedule is important for transparency and understanding the ownership landscape of publicly traded companies.

FAQ

What percentage of Mountain Crest Acquisition 6 Corp. (MCAH) shares does Highbridge Capital Management own?

Highbridge Capital Management reports beneficial ownership of 6.3% of Mountain Crest Acquisition 6 Corp. Ordinary Shares. This stake is based on 9,047,143 shares outstanding as of June 1, 2026, as disclosed in the issuer’s Form 10-Q.

How many Mountain Crest Acquisition 6 Corp. (MCAH) shares are reported by Highbridge Capital Management?

Highbridge Capital Management reports beneficial ownership of 570,000 Ordinary Shares of Mountain Crest Acquisition 6 Corp. These shares are held by funds and accounts it advises, with Highbridge retaining sole voting and dispositive power over the position.

Does Highbridge Capital Management share voting power over its MCAH holdings?

Highbridge Capital Management reports sole voting power over 570,000 shares and no shared voting power in Mountain Crest Acquisition 6 Corp. It likewise has sole dispositive power and no shared dispositive power over these Ordinary Shares.

Which Highbridge fund holds more than 5% of Mountain Crest Acquisition 6 Corp. (MCAH)?

Highbridge Tactical Credit Master Fund, L.P. has the right to receive or direct dividends or sale proceeds for more than 5% of MCAH’s Ordinary Shares. This fund is one of the Highbridge-advised vehicles referenced in the ownership report.

On what share count is Highbridge’s 6.3% MCAH ownership calculation based?

The reported 6.3% ownership is calculated using 9,047,143 Ordinary Shares outstanding as of June 1, 2026. That outstanding share figure comes from Mountain Crest Acquisition 6 Corp.’s Form 10-Q for the quarter ended March 31, 2026.

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

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Available on EDGAR 08/14/2026 - 12:33 PM Accepted by SEC EDGAR 08/14/2026 - 12:32 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Mountain Crest Acquisition 6 Corp.

(Name of Issuer)

Ordinary Shares, par value $0.0001 per share

(Title of Class of Securities)

G62980100

(CUSIP Number)

06/30/2026

(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): G62980100

1

Names of Reporting Persons

Highbridge Capital Management, LLC

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

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 570,000.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 570,000.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

570,000.00

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)

6.3 %

12

Type of Reporting Person (See Instructions)

IA, OO

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Mountain Crest Acquisition 6 Corp.
(b)	Address of issuer's principal executive offices: 524 Broadway, 11th Floor, New York, NY, 10012
Item 2.
(a)	Name of person filing: This statement is filed by Highbridge Capital Management, LLC ("Highbridge" or the "Reporting Person"), a Delaware limited liability company and the investment adviser to certain funds and accounts (the "Highbridge Funds"), with respect to the ordinary shares, par value $0.0001 per share ("Ordinary Shares"), of Mountain Crest Acquisition 6 Corp., a British Virgin Islands business company (the "Issuer"), directly held by the Highbridge Funds; The filing of this statement should not be construed as an admission that any of the foregoing persons or the Reporting Person is, for the purposes of Section 13 of the Securities Exchange Act of 1934, the beneficial owner of the securities reported herein.
(b)	Address or principal business office or, if none, residence: The address of the business office of the Reporting Person is 390 Madison Avenue, 28th Floor, New York, NY 10017.
(c)	Citizenship: Highbridge is a Delaware limited liability company.
(d)	Title of class of securities: Ordinary Shares, par value $0.0001 per share
(e)	CUSIP Number(s): G62980100
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: The information required by Item 4(a) is set forth in Row 9 of the cover page for the Reporting Person and is incorporated herein by reference. The percentage set forth in this Schedule 13G is calculated based upon an aggregate of 9,047,143 Ordinary Shares outstanding as of June 1, 2026, as reported in the Issuer's Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2026, with the Securities and Exchange Commission on June 1, 2026.
(b)	Percent of class: 6.3%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: The information required by Item 4(c)(i) is set forth in Row 5 of the cover page for the Reporting Person and is incorporated herein by reference.
	(ii) Shared power to vote or to direct the vote: The information required by Item 4(c)(ii) is set forth in Row 6 of the cover page for the Reporting Person and is incorporated herein by reference.
	(iii) Sole power to dispose or to direct the disposition of: The information required by Item 4(c)(iii) is set forth in Row 7 of the cover page for the Reporting Person and is incorporated herein by reference.
	(iv) Shared power to dispose or to direct the disposition of: The information required by Item 4(c)(iv) is set forth in Row 8 of the cover page for the Reporting Person and is incorporated herein by reference.
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.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. See Item 2(a). The Highbridge Funds have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the Ordinary Shares reported herein. Highbridge Tactical Credit Master Fund, L.P., a Highbridge Fund, has the right to receive or the power to direct the receipt of dividends or the proceeds from the sale of more than 5% of the outstanding Ordinary Shares.
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.

Highbridge Capital Management, LLC

Signature:	/s/ Kirk Rule
Name/Title:	By: Kirk Rule, Executive Director
Date:	08/14/2026