Mountain Crest Acquisition 6 (NASDAQ: MCAHU) holder forfeits 385,714 founder shares after IPO over-allotment lapses

Rhea-AI Filing Summary

Mountain Crest Holdings 6 LLC, a major shareholder of Mountain Crest Acquisition 6 Corp., forfeited 385,714 ordinary shares for no consideration. These were founder shares that were subject to forfeiture because the underwriters of the company’s initial public offering did not exercise their over-allotment option. After this adjustment, the reporting holder owns 2,596,429 ordinary shares.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Mountain Crest Holdings 6 LLC

Role null

Type	Security	Shares	Price	Value
Other	Ordinary shares	385,714	$0.00	--

Holdings After Transaction: Ordinary shares — 2,596,429 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Founder shares forfeited: 385,714 shares Shares after transaction: 2,596,429 shares Par value per share: $0.0001 per share +1 more

4 metrics

Founder shares forfeited 385,714 shares Founder ordinary shares canceled when IPO over-allotment option was not exercised

Shares after transaction 2,596,429 shares Ordinary shares directly owned by Mountain Crest Holdings 6 LLC following forfeiture

Par value per share $0.0001 per share Par value of Mountain Crest Acquisition 6 Corp. ordinary shares referenced in footnote

Restructuring shares 385,714 shares Shares classified under restructuring-type “other” transaction (Code J)

Key Terms

over-allotment option, founder shares, forfeiture, initial public offering

4 terms

over-allotment option financial

"because the underwriters of the Issuer's initial public offering did not exercise their over-allotment option"

An over-allotment option is a special agreement that allows underwriters to sell more shares than initially planned if demand is high. Think of it like a retailer offering extra units of a popular product to meet additional customer interest. This option helps ensure the full sale is completed and can also give investors extra shares if they want more.

founder shares financial

"The forfeited shares were the full 385,714 founder shares that were subject to forfeiture"

Founder shares are the ownership stakes given to the people who start a company, often with extra voting power or protections compared with ordinary shares. For investors, they matter because founders’ control and incentives influence decisions about strategy, hiring, and whether the company sells or stays independent — like a family that keeps majority voting rights in a household decision. High founder ownership can mean stable leadership but also a risk that outside shareholders have less influence.

forfeiture financial

"Represents the forfeiture for no consideration of 385,714 ordinary shares"

initial public offering financial

"because the underwriters of the Issuer's initial public offering did not exercise"

An initial public offering (IPO) is when a private company first sells its shares to the public and becomes a stock-listed company. It matters because it allows the company to raise money from a wide range of investors, helping it grow, while giving early shareholders a way to sell some of their ownership.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 06/25/2026 - 09:20 PM Accepted by SEC EDGAR 06/25/2026 - 09:20 PM Learn about SEC filing dates

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Mountain Crest Holdings 6 LLC

(Last) (First) (Middle)

C/O MOUNTAIN CREST ACQUISITION 6 CORP.,

524 BROADWAY, 11TH FLOOR,

(Street)

NEW YORK NEW YORK 10012

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Mountain Crest Acquisition 6 Corp. [ MCAH ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director	X	10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/24/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Ordinary shares	06/24/2026		J(1)		385,714(1)	D	(1)	2,596,429	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents the forfeiture for no consideration of 385,714 ordinary shares, par value $0.0001 per share, of Mountain Crest Acquisition 6 Corp. (the "Issuer") held by Mountain Crest Holdings 6 LLC because the underwriters of the Issuer's initial public offering did not exercise their over-allotment option. The forfeited shares were the full 385,714 founder shares that were subject to forfeiture depending on the extent to which the underwriters' over-allotment option was exercised.

	/s/ Suying Liu Sole Member	06/25/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What did Mountain Crest Holdings 6 LLC do in this Form 4 for MCAHU?

Mountain Crest Holdings 6 LLC forfeited 385,714 ordinary shares of Mountain Crest Acquisition 6 Corp. for no consideration. These were founder shares tied to the IPO underwriters’ over-allotment option, which was not exercised, triggering the automatic forfeiture.

Why were 385,714 Mountain Crest Acquisition 6 Corp. shares forfeited?

The 385,714 ordinary shares were forfeited because IPO underwriters did not exercise their over-allotment option. Those founder shares were explicitly subject to forfeiture depending on how much of the over-allotment option was used and were canceled when it was not exercised.

How many MCAHU shares does Mountain Crest Holdings 6 LLC hold after the transaction?

After the forfeiture, Mountain Crest Holdings 6 LLC holds 2,596,429 ordinary shares of Mountain Crest Acquisition 6 Corp. The Form 4 reports this as the total number of shares directly owned following the restructuring-type transaction.

Was the Mountain Crest Holdings 6 LLC transaction a sale or purchase of MCAHU shares?

The transaction was neither a traditional sale nor a purchase. It was classified as an “other” transaction, specifically a forfeiture of 385,714 founder shares for no consideration, triggered by the underwriters not exercising the IPO over-allotment option.

Did Mountain Crest Holdings 6 LLC receive any payment for the forfeited MCAHU shares?

No payment was received for the forfeited shares. The footnote states the 385,714 ordinary shares were forfeited for no consideration when the IPO underwriters did not exercise their over-allotment option, causing automatic cancellation of those founder shares.

What type of shares were affected in this MCAHU Form 4 filing?

The filing involves ordinary shares of Mountain Crest Acquisition 6 Corp., specifically 385,714 founder shares. These founder shares were subject to forfeiture based on whether the IPO underwriters exercised their over-allotment option and were canceled when that option was not used.