Mountain Crest reports 29.98% stake (2.60M shares)

Mountain Crest Acquisition 6 Corp. ownership disclosure: Mountain Crest Holdings 6 LLC (the Sponsor) reports record ownership of 2,596,429 Ordinary Shares, representing 29.98% of the Issuer's outstanding Ordinary Shares as of June 25, 2026.

Rhea-AI Filing Summary

Mountain Crest Acquisition 6 Corp. ownership disclosure: Mountain Crest Holdings 6 LLC (the Sponsor) reports record ownership of 2,596,429 Ordinary Shares, representing 29.98% of the Issuer's outstanding Ordinary Shares as of June 25, 2026. The filing states 8,661,429 Ordinary Shares issued and outstanding as of June 25, 2026.

The Schedule 13G is jointly filed by the Sponsor and Suying Liu; Dr. Liu is identified as the Sponsor's manager with voting and dispositive power over the shares held of record by the Sponsor, and Dr. Liu disclaims beneficial ownership except to the extent of any pecuniary interest. The filing includes a Joint Filing Agreement pursuant to Rule 13d-1(k).

Insights

Governance Analyst

Large holder reports near-30% stake under joint Schedule 13G.

The Sponsor holds 2,596,429 Ordinary Shares, equal to 29.98% of the class based on 8,661,429 shares outstanding as of June 25, 2026. The filing attributes voting and dispositive power to the Sponsor and identifies Dr. Liu as the Sponsor's manager.

Because this is a Schedule 13G joint filing under Rule 13d-1(k), it is presented as passive/beneficial ownership reporting; subsequent filings could change characterization if the holder becomes active. Cash-flow treatment or sale intentions are not disclosed in the excerpt.

Key Figures

Filing type: Schedule 13G Shares held by Sponsor: 2,596,429 shares Percent of class: 29.98% +1 more

4 metrics

Filing type Schedule 13G Ownership disclosure

Shares held by Sponsor 2,596,429 shares record holder as of June 25, 2026

Percent of class 29.98% based on 8,661,429 shares outstanding as of June 25, 2026

Shares outstanding 8,661,429 Ordinary Shares as of June 25, 2026

Key Terms

Schedule 13G, Beneficially owned, Sole Dispositive Power, Joint Filing Agreement

4 terms

Schedule 13G regulatory

"This report on is being filed by (i) Mountain Crest Holdings 6 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.

Beneficially owned regulatory

"As of June 25, 2026, the Sponsor is the record holder of 2,596,429 shares"

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 financial

"Sole Dispositive Power 2,596,429.00"

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.

Joint Filing Agreement regulatory

"Joint Filing Agreement pursuant to Rule 13d-1(k)"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What stake does Mountain Crest Holdings 6 LLC report in MCAHU?

Mountain Crest Holdings 6 LLC reports beneficial ownership of 2,596,429 Ordinary Shares, representing 29.98% of the outstanding Ordinary Shares as of June 25, 2026. The percentage is based on 8,661,429 shares outstanding on that date.

Who is Suying Liu in the MCAHU Schedule 13G filing?

The filing identifies Suying Liu as the manager of the Sponsor and a joint filer. Dr. Liu is reported to have voting and dispositive power over the Sponsor-held shares and disclaims beneficial ownership except to the extent of any pecuniary interest.

What date and share count does the filing use for outstanding shares?

The Schedule 13G states there were 8,661,429 Ordinary Shares issued and outstanding as of June 25, 2026, and uses that figure to calculate the Sponsor's 29.98% ownership percentage in the Issuer.

Does the filing state whether the Sponsor will sell shares?

The document does not state any selling intentions or plan of distribution. It is a beneficial ownership report that discloses holdings and voting/dispositive power; no sale instructions or proceeds treatment are included in the provided excerpt.

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

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Accepted by SEC EDGAR 06/25/2026 - 09:16 PM EDT 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 share, par value $0.0001 per share

(Title of Class of Securities)

G62980100

(CUSIP Number)

05/01/2026

(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

Mountain Crest Holdings 6 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 2,596,429.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 2,596,429.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,596,429.00

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)

29.98 %

12

Type of Reporting Person (See Instructions)

OO

Comment for Type of Reporting Person: See Item 4 for additional information.

SCHEDULE 13G

CUSIP Number(s): G62980100

1

Names of Reporting Persons

Suying Liu

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

CHINA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 2,596,429.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 2,596,429.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,596,429.00

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)

29.98 %

12

Type of Reporting Person (See Instructions)

IN

Comment for Type of Reporting Person: See Item 4 for additional information.

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 report on Schedule 13G is being filed by (i) Mountain Crest Holdings 6 LLC, a Delaware limited liability company (the "Sponsor") and (ii) Suying Liu ("Dr. Liu" and, collectively with the Sponsor, the "Reporting Persons"). The Sponsor and Dr. Liu have entered into a Joint Filing Agreement, dated the date hereof, pursuant to which the Sponsor and Dr. Liu have agreed to file this statement and any subsequent amendments hereto jointly in accordance with the provisions of Rule 13d-1(k)(1) under the Act. Any disclosures herein with respect to persons other than the Sponsor and Dr. Liu are made on information and belief after making inquiry to the appropriate party. The filing of this statement should not be construed as an admission that any of the forgoing persons is, for the purposes of Section 13 of the Act, the beneficial owner of the Ordinary Shares reported herein.
(b)	Address or principal business office or, if none, residence: The principal place of business of each of the Reporting Persons is 524 Broadway, 11th Floor, New York, NY 10012.
(c)	Citizenship: Mountain Crest Holdings 6 LLC is a Delaware limited liability company. Dr. Liu is a citizen of China.
(d)	Title of class of securities: Ordinary share, 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: As of June 25, 2026, the Sponsor is the record holder of 2,596,429 shares of ordinary shares, par value $0.0001 per share (the Ordinary Shares") of Mountain Crest Acquisition 6 Corp. (the "Issuer"). As a result of the foregoing, the Sponsor beneficially owns approximately 29.98% of the outstanding Ordinary Shares of the Issuer as of June 25, 2026. Ownership percentages are based on 8,661,429 Ordinary Shares issued and outstanding as of June 25, 2026, as disclosed by the Issuer directly to the Reporting Persons. Dr. Liu is the manager of the Sponsor and has voting and dispositive power over the securities held of record by the Sponsor. Dr. Liu disclaims any beneficial ownership of the securities held by the Sponsor, except to the extent of his pecuniary interest therein.
(b)	Percent of class: 29.98%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: Mountain Crest Holdings 6 LLC - 2,596,429 Ordinary Shares Suying Liu - 2,596,429 Ordinary Shares
	(ii) Shared power to vote or to direct the vote: Mountain Crest Holdings 6 LLC - 0 Suying Liu - 0
	(iii) Sole power to dispose or to direct the disposition of: Mountain Crest Holdings 6 LLC - 2,596,429 Ordinary Shares Suying Liu - 2,596,429 Ordinary Shares
	(iv) Shared power to dispose or to direct the disposition of: Mountain Crest Holdings 6 LLC - 0 Suying Liu - 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:
	Not Applicable

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.

Mountain Crest Holdings 6 LLC

Signature:	/s/ Suying Liu
Name/Title:	Suying Liu/Sole Manager
Date:	06/25/2026

Suying Liu

Signature:	/s/ Suying Liu
Name/Title:	Suying Liu
Date:	06/25/2026

Exhibit Information

Exhibit 1. Joint Filing Agreement pursuant to Rule 13d-1(k)