Momentus: Schedule 13G Names Davidson Kempner Group

Momentus Inc. received a Schedule 13G filing naming Davidson Kempner-related entities and Anthony A. Yoseloff as Reporting Persons for Class A Common Stock, CUSIP 60879E408.

Rhea-AI Filing Summary

Momentus Inc. received a Schedule 13G filing naming Davidson Kempner-related entities and Anthony A. Yoseloff as Reporting Persons for Class A Common Stock, CUSIP 60879E408. The filing lists a par value of $0.00001 per share and states the Reporting Persons may have been deemed to beneficially own more than 5% of the Class A Common Stock; the cover page reports 0% for percent of class. The filing provides reporting addresses and organizational details and is signed by Anthony A. Yoseloff on 05/15/2026.

Insights

Institutional Ownership Specialist

Schedules 13G list passive ownership positions; this one names Davidson Kempner entities.

The filing identifies multiple Davidson Kempner entities and Anthony A. Yoseloff as Reporting Persons tied to Class A Common Stock, CUSIP 60879E408. It includes corporate structure, addresses, and signatures dated 05/15/2026.

Disclosure notes the Reporting Persons "may have been deemed" to beneficially own more than 5% while the cover lists 0% percent of class; subsequent filings or cover-page detail would clarify the exact share counts and economic exposure.

Corporate Governance Analyst

This filing documents beneficial‑ownership reporting and control links among related entities.

It traces voting and investment decision responsibility to DKCM and lists managing members, providing governance context for the positions disclosed. The address for the reporting group is c/o Davidson Kempner Capital Management LP, New York.

Because amount details on Row 9 are referenced but not included in the excerpt, the precise share count and whether a passive investor or active holder is represented require the referenced cover‑page rows to be read.

Key Figures

CUSIP: 60879E408 Par value: $0.00001 per share Signature date: 05/15/2026 +2 more

5 metrics

CUSIP 60879E408 Class A Common Stock identifier

Par value $0.00001 per share Class A Common Stock par value

Signature date 05/15/2026 Filing signatures by Anthony A. Yoseloff

Event date listed 05/08/2026 Date appearing near cover information

Percent of class 0% Item 4(b) percent of class as reported on cover page

Key Terms

Schedule 13G, beneficially own, shared dispositive power

3 terms

Schedule 13G regulatory

"Item 1. Name of issuer: Momentus Inc.; form header indicates Schedule 13G"

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 own regulatory

"As of the date of the event the Reporting Persons may have been deemed to beneficially own more than 5%"

Beneficially own means having the economic rights and risks of a security—such as the right to receive dividends, sell the shares, or profit from price changes—whether or not your name appears on the official share register. Think of it like renting a car: you use it and reap the benefits even if the title lists someone else. Investors care because beneficial ownership determines who truly controls value, must be disclosed under securities rules, and can signal potential influence or trading activity that affects a stock’s price.

shared dispositive power financial

"Row 8 of the cover page lists shared dispositive power values for each Reporting Person"

FAQ

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

What does the Momentus (MNTS) Schedule 13G filing disclose?

It names Davidson Kempner entities and Anthony A. Yoseloff as Reporting Persons for Class A Common Stock. The filing cites CUSIP 60879E408 and a par value of $0.00001 per share and is signed on 05/15/2026.

Does the Schedule 13G state how much of MNTS the reporting group owns?

The excerpt references Row 9 for the Item 4 amounts and states the Reporting Persons "may have been deemed" to beneficially own more than 5%. The cover page in this excerpt lists 0% as percent of class.

Who is responsible for voting and investment decisions for the reported MNTS shares?

Davidson Kempner Capital Management LP (DKCM) is identified as responsible for voting and investment decisions for the disclosed interests, with Anthony A. Yoseloff named as the individual responsible through DKCM.

What are the Reporting Persons' addresses for the MNTS Schedule 13G?

The principal business office for each Reporting Person is listed as c/o Davidson Kempner Capital Management LP, 9 West 57th Street, 29th Floor, New York, NY 10019, per the filing.

When was the Schedule 13G for MNTS signed and by whom?

The filing excerpts show signatures by Anthony A. Yoseloff dated 05/15/2026, signed in multiple representative capacities for the Davidson Kempner entities and individually.

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

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Accepted by SEC EDGAR 05/15/2026 - 05:20 PM EDT Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Momentus Inc.

(Name of Issuer)

Class A Common Stock, par value $0.00001 per share

(Title of Class of Securities)

60879E408

(CUSIP Number)

05/08/2026

(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): 60879E408

1

Names of Reporting Persons

M.H. DAVIDSON & CO.

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

NEW YORK

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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)

0 %

12

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13G

CUSIP Number(s): 60879E408

1

Names of Reporting Persons

Davidson Kempner Arbitrage, Equities & Relative Value LP

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

CAYMAN ISLANDS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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)

0 %

12

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13G

CUSIP Number(s): 60879E408

1

Names of Reporting Persons

DAVIDSON KEMPNER CAPITAL MANAGEMENT LP

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 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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)

0 %

12

Type of Reporting Person (See Instructions)

PN

SCHEDULE 13G

CUSIP Number(s): 60879E408

1

Names of Reporting Persons

Anthony A. Yoseloff

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

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

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)

0 %

12

Type of Reporting Person (See Instructions)

IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Momentus Inc.
(b)	Address of issuer's principal executive offices: 1762 Automation Parkway, San Jose, California 95131
Item 2.
(a)	Name of person filing: This Statement is filed by each of the entities and persons listed below, all of whom together are referred to herein as the "Reporting Persons": (i) M.H. Davidson & Co., a New York limited partnership ("CO"). M.H. Davidson & Co. GP, L.L.C., a Delaware limited liability company ("CO GP"), is the general partner of CO and Davidson Kempner Liquid GP Topco LLC, a Delaware limited liability company, is the managing member of CO GP. DKCM (as defined below) is responsible for the voting and investment decisions of CO; (ii) Davidson Kempner Arbitrage, Equities and Relative Value LP, a Cayman Islands exempted limited partnership ("DKAERV"). Davidson Kempner Multi-Strategy GP II LLC, a Delaware limited liability company ("DKAERV GP"), is the general partner of DKAERV and Davidson Kempner Liquid GP Topco LLC, a Delaware limited liability company, is the managing member of DKAERV GP. DKCM is responsible for the voting and investment decisions of DKAERV; (iii) Davidson Kempner Capital Management LP, a Delaware limited partnership and a registered investment adviser with the U.S. Securities and Exchange Commission, acts as investment manager to each of CO and DKAERV ("DKCM"). DKCM GP LLC, a Delaware limited liability company, is the general partner of DKCM. The managing members of DKCM are Anthony A. Yoseloff, Conor Bastable, Morgan P. Blackwell, Patrick W. Dennis, Gabriel T. Schwartz, Zachary Z. Altschuler, Joshua D. Morris, Suzanne K. Gibbons, Gregory S. Feldman, Melanie Levine and James Li; and (iv) Anthony A. Yoseloff, through DKCM, is responsible for the voting and investment decisions relating to the Class A common stock, par value $0.00001 per share ("Class A Common Stock"), of Momentus Inc. that were held by CO and DKAERV.
(b)	Address or principal business office or, if none, residence: The address of the principal business office of each of the Reporting Persons is c/o Davidson Kempner Capital Management LP, 9 West 57th Street, 29th Floor, New York, NY 10019.
(c)	Citizenship: (i) CO - a New York limited partnership (ii) DKAERV - a Cayman Islands exempted limited partnership (iii) DKCM - a Delaware limited partnership (iv) Anthony A. Yoseloff - United States
(d)	Title of class of securities: Class A Common Stock, par value $0.00001 per share
(e)	CUSIP Number(s): 60879E408
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 each of the Reporting Persons and is incorporated herein by reference. As of the date of the event which requires the filing of this Schedule 13G, the Reporting Persons may have been deemed to beneficially own more than 5% of the shares of Class A Common Stock outstanding.
(b)	Percent of class: 0%
(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 each of the Reporting Persons 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 each of the Reporting Persons 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 each of the Reporting Persons 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 each of the Reporting Persons and is incorporated herein by reference.
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
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 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.

M.H. DAVIDSON & CO.

Signature:	/s/ Anthony A. Yoseloff
Name/Title:	Anthony A. Yoseloff, Executive Managing Member of Davidson Kempner Liquid GP Topco LLC, Managing Member of CO GP, General Partner of CO
Date:	05/15/2026

Davidson Kempner Arbitrage, Equities & Relative Value LP

Signature:	/s/ Anthony A. Yoseloff
Name/Title:	Anthony A. Yoseloff, Executive Managing Member of Davidson Kempner Liquid GP Topco LLC, Managing Member of DKAERV GP, General Partner of DKAERV
Date:	05/15/2026

DAVIDSON KEMPNER CAPITAL MANAGEMENT LP

Signature:	/s/ Anthony A. Yoseloff
Name/Title:	Anthony A. Yoseloff, Executive Managing Member
Date:	05/15/2026

Anthony A. Yoseloff

Signature:	/s/ Anthony A. Yoseloff
Name/Title:	Anthony A. Yoseloff, Individually
Date:	05/15/2026