Momentus Inc. (MNTS) investor group reports 4.51% stake in Class A shares

Rhea-AI Filing Summary

Momentus Inc. investor group reports a sub‑5% passive stake in Class A common stock. Investment entities affiliated with Davidson Kempner Capital Management LP (DKCM), including M.H. Davidson & Co. and Davidson Kempner Arbitrage, Equities and Relative Value LP, report aggregate beneficial ownership of 850,000 shares of Momentus Inc. Class A common stock, representing 4.51% of the class. All reported shares are held with shared voting and dispositive power; no reporting person has sole voting or dispositive power. The ownership percentages are based on 18,835,815 shares outstanding as of June 18, 2026, as cited from a company prospectus. The filing indicates that each reporting person now owns 5 percent or less of this class of securities.

Key Figures

Beneficial ownership (DKCM & Yoseloff): 850,000 shares Ownership percentage (DKCM & Yoseloff): 4.51% Shares held by DKAERV: 834,529 shares +2 more

5 metrics

Beneficial ownership (DKCM & Yoseloff) 850,000 shares Class A common stock beneficially owned, representing 4.51% of the class

Ownership percentage (DKCM & Yoseloff) 4.51% Percent of Momentus Inc. Class A common stock beneficially owned

Shares held by DKAERV 834,529 shares Class A common stock with shared voting and dispositive power, 4.43% of class

Shares held by M.H. Davidson & Co. 15,471 shares Class A common stock with shared voting and dispositive power, 0.08% of class

Shares outstanding 18,835,815 shares Class A common stock outstanding as of June 18, 2026, per company prospectus

Key Terms

beneficially owned, shared voting power, shared dispositive power, Schedule 13G/A, +1 more

5 terms

beneficially owned financial

"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."

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.

shared voting power financial

"6 | Shared Voting Power 850,000.00"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

shared dispositive power financial

"8 | Shared Dispositive Power 850,000.00"

Schedule 13G/A regulatory

"The percentages set forth in this are calculated based upon an aggregate of 18,835,815 shares of Class A Common Stock outstanding..."

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

Class A Common Stock financial

"Title of class of securities: Class A Common Stock, par value $0.00001 per share"

Class A common stock is a category of a company’s shares that carries a specific set of ownership rights—most commonly defined voting power and claims on dividends—set out in the company’s charter. For investors it matters because the class determines how much influence you have over corporate decisions, the share’s likely dividend and trading behavior, and how it compares in value to other share classes, like choosing a particular seat with different privileges at the company’s decision-making table.

FAQ

What percentage of Momentus Inc. (MNTS) does the Davidson Kempner group report owning?

The Davidson Kempner group reports beneficially owning 4.51% of Momentus Inc. Class A common stock. This corresponds to 850,000 shares, with all voting and dispositive power shared among the reporting persons and none held solely.

How many Momentus Inc. (MNTS) shares are beneficially owned by Davidson Kempner Capital Management?

Davidson Kempner Capital Management LP is reported as beneficially owning 850,000 shares of Momentus Inc. Class A common stock. This stake represents 4.51% of the class, based on 18,835,815 shares outstanding as of June 18, 2026.

What is the outstanding share count used to calculate Davidson Kempner’s MNTS ownership?

The reported ownership percentages are calculated using 18,835,815 shares of Momentus Inc. Class A common stock outstanding. This figure comes from a company prospectus dated June 18, 2026 and underpins the 4.51% ownership calculation.

Do the Davidson Kempner reporting persons hold sole or shared voting power over MNTS shares?

The reporting persons hold shared voting and dispositive power over their Momentus Inc. shares and have no sole voting or dispositive power. For example, DKCM and Anthony A. Yoseloff each report shared power over 850,000 shares.

Which Davidson Kempner entities hold Momentus Inc. (MNTS) shares and in what amounts?

M.H. Davidson & Co. reports 15,471 shares (0.08%), while Davidson Kempner Arbitrage, Equities and Relative Value LP reports 834,529 shares (4.43%). DKCM and Anthony A. Yoseloff each report beneficial ownership of 850,000 shares (4.51%).

Does the filing state that Davidson Kempner owns 5 percent or less of MNTS?

Yes. The Schedule 13G/A explicitly indicates ownership of 5 percent or less of Momentus Inc. Class A common stock. The largest reported stake is 4.51%, corresponding to 850,000 shares beneficially owned by DKCM and Anthony A. Yoseloff.

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Available on EDGAR 08/14/2026 - 02:34 PM Accepted by SEC EDGAR 08/14/2026 - 02:31 PM Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Momentus Inc.

(Name of Issuer)

Class A Common Stock, par value $0.00001 per share

(Title of Class of Securities)

60879E408

(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): 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 15,471.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 15,471.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

15,471.00

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)

0.08 %

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 834,529.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 834,529.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

834,529.00

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)

4.43 %

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 850,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 850,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

850,000.00

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)

4.51 %

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 850,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 850,000.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

850,000.00

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)

4.51 %

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. (the "Company") 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 No.: 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. The percentages set forth in this Schedule 13G are calculated based upon an aggregate of 18,835,815 shares of Class A Common Stock outstanding as of June 18, 2026, as reported in the Company's Prospectus filed pursuant to Rule 424(b)(5) filed with the Securities and Exchange Commission on June 18, 2026.
(b)	Percent of class: 4.51%
(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:	08/14/2026

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:	08/14/2026

Davidson Kempner Capital Management LP

Signature:	/s/ Anthony A. Yoseloff
Name/Title:	Anthony A. Yoseloff, Executive Managing Member
Date:	08/14/2026

Anthony A. Yoseloff

Signature:	/s/ Anthony A. Yoseloff
Name/Title:	Anthony A. Yoseloff, Individually
Date:	08/14/2026