# EDGAR Filing Document

**Accession Number:** 0002116124
**File Stem:** 0001829126-26-006886
**Filing Date:** 2026-6
**Character Count:** 12211
**Document Hash:** 68d1a007b62690c691fd0dc47fca6dd6
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001829126-26-006886.hdr.sgml**: 20260625

**ACCESSION NUMBER**: 0001829126-26-006886

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13G

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260625

**DATE AS OF CHANGE**: 20260625

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Mountain Crest Acquisition 6 Corp.
- **CENTRAL INDEX KEY:** 0002109876
- **STANDARD INDUSTRIAL CLASSIFICATION:** BLANK CHECKS [6770]
- **ORGANIZATION NAME:** 05 Real Estate & Construction
- **EIN:** 000000000
- **STATE OF INCORPORATION:** D8
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13G
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-95664
- **FILM NUMBER:** 261123617

**BUSINESS ADDRESS:**
- **STREET 1:** 524 BROADWAY, 11TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10012
- **BUSINESS PHONE:** 646-493-6558

**MAIL ADDRESS:**
- **STREET 1:** 524 BROADWAY, 11TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10012
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Mountain Crest Holdings 6 LLC
- **CENTRAL INDEX KEY:** 0002116124

**ORGANIZATION NAME:**
- **EIN:** 000000000
- **STATE OF INCORPORATION:** D8
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13G

**BUSINESS ADDRESS:**
- **STREET 1:** 524 BROADWAY, 11TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10012
- **BUSINESS PHONE:** 646-493-6558

**MAIL ADDRESS:**
- **STREET 1:** 524 BROADWAY, 11TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10012

## Ex-1

**<u>Exhibit 1</u>**

**JOINT FILING AGREEMENT**

In accordance with Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, the undersigned agree to the joint filing on behalf of each of them of a Statement on Schedule 13G (including any and all amendments thereto) with respect to the ordinary shares, par value $0.0001 per share, of Mountain Crest Acquisition 6 Corp., a British Virgin Island Company, and further agree that this Joint Filing Agreement shall be included as an Exhibit to such joint filings.

The undersigned further agree that each party hereto is responsible for the timely filing of such Statement on Schedule 13G and any amendments thereto, and for the accuracy and completeness of the information concerning such party contained therein; provided, however, that no party is responsible for the accuracy or completeness of the information concerning any other party, unless such party knows or has reason to believe that such information is inaccurate.

This Joint Filing Agreement may be signed in counterparts with the same effect as if the signature on each counterpart were upon the same instrument.

IN WITNESS WHEREOF, the undersigned have executed this agreement as of June 25, 2026.

---

| | |
|:---|:---|
| Mountain Crest Holdings 6 LLC | Mountain Crest Holdings 6 LLC |
| By: | /s/ Suying Liu |
| Name: | Suying Liu |
| Title: | Sole Manager |
| /s/ Suying Liu | /s/ Suying Liu |
| Suying Liu | Suying Liu |

---

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

## SCHEDULE 13G

### Under the Securities Exchange Act of 1934

**Issuer:** Mountain Crest Acquisition 6 Corp.

**Title of Class of Securities:** Ordinary share, par value $0.0001 per share

**CUSIP Number:** —

**Date of Event Which Requires Filing of this Statement:** 05/01/2026

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

- [ ] Rule 13d-1(b)

- [ ] Rule 13d-1(c)

- [x] Rule 13d-1(d)

---

| 1. | Names of Reporting Persons<br>Mountain Crest Holdings 6 LLC | Names of Reporting Persons<br>Mountain Crest Holdings 6 LLC |
|:---|:---|:---|:---|
| 2. | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] |
| 3. | SEC Use Only | SEC Use Only |
| 4. | Citizenship or Place of Organization<br>DE | Citizenship or Place of Organization<br>DE |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>2596429.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>2596429.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>0.00 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>2596429.00 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>2596429.00 |
| 10. | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] |
| 11. | Percent of Class Represented by Amount in Row (9)<br>29.98% | Percent of Class Represented by Amount in Row (9)<br>29.98% |
| 12. | Type of Reporting Person (See Instructions)<br>OO | Type of Reporting Person (See Instructions)<br>OO |

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

---

| 1. | Names of Reporting Persons<br>Suying Liu | Names of Reporting Persons<br>Suying Liu |
|:---|:---|:---|:---|
| 2. | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] |
| 3. | SEC Use Only | SEC Use Only |
| 4. | Citizenship or Place of Organization<br>F4 | Citizenship or Place of Organization<br>F4 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>2596429.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>0.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>2596429.00 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>0.00 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>2596429.00 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>2596429.00 |
| 10. | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] |
| 11. | Percent of Class Represented by Amount in Row (9)<br>29.98% | Percent of Class Represented by Amount in Row (9)<br>29.98% |
| 12. | Type of Reporting Person (See Instructions)<br>IN | Type of Reporting Person (See Instructions)<br>IN |

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

---

**Item 1(a). Name of Issuer:**
Mountain Crest Acquisition 6 Corp.

**Item 1(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.

**Item 2(b). Address of Principal Business Office:**
The principal place of business of each of the Reporting Persons is 524 Broadway, 11th Floor, New York, NY 10012.

**Item 2(c). Citizenship:**
Mountain Crest Holdings 6 LLC is a Delaware limited liability company. Dr. Liu is a citizen of China.

**Item 2(d). Title of Class of Securities:**
Ordinary share, par value $0.0001 per share

**Item 2(e). CUSIP Number:**
—

**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 Five Percent or Less of a Class.**

[x] If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following.

**Item 6. Ownership of More than 5 Percent on Behalf of Another Person.**

Not Applicable

**Item 7. Identification and Classification of the Subsidiary**

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. Certification:**

—

### 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**

**Date:** 06/25/2026

**By:** /s/ Suying Liu

**Name & Title:** Suying Liu/Sole Manager

**Suying Liu**

**Date:** 06/25/2026

**By:** /s/ Suying Liu

**Name & Title:** Suying Liu