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)

05/20/2026

(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)

SCHEDULE 13G

CUSIP Number(s):

60879E408

Names of Reporting Persons

M.H. Davidson & Co.

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

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 22,680.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 22,680.00

Aggregate Amount Beneficially Owned by Each Reporting Person

22,680.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

0.17 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP Number(s):

60879E408

Names of Reporting Persons

Davidson Kempner Arbitrage, Equities & Relative Value LP

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

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 1,177,320.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,177,320.00

Aggregate Amount Beneficially Owned by Each Reporting Person

1,177,320.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

8.73 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP Number(s):

60879E408

Names of Reporting Persons

Davidson Kempner Capital Management LP

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

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 1,200,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,200,000.00

Aggregate Amount Beneficially Owned by Each Reporting Person

1,200,000.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

8.90 %

Type of Reporting Person (See Instructions)

SCHEDULE 13G

CUSIP Number(s):

60879E408

Names of Reporting Persons

Anthony A. Yoseloff

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

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 1,200,000.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 1,200,000.00

Aggregate Amount Beneficially Owned by Each Reporting Person

1,200,000.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

8.90 %

Type of Reporting Person (See Instructions)

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") 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. The percentages set forth in this Schedule 13G are calculated based upon an aggregate of 13,489,553 shares of Class A Common Stock outstanding, which is the sum of (i) 10,547,553 shares of Class A Common Stock outstanding as of May 21, 2026, as reported on the Company's Registration Statement on Form S-3, filed with the Securities and Exchange Commission on May 26, 2026; and (ii) 2,942,000 shares of Class A Common Stock issued in the private placement entered into on May 27, 2026, as described on the Company's Investor Relations' website.

(b)

Percent of class:

8.90%

(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.

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:

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:	05/28/2026

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:	05/28/2026

Davidson Kempner Capital Management LP

Signature:	/s/ Anthony A. Yoseloff
Name/Title:	Anthony A. Yoseloff, Executive Managing Member
Date:	05/28/2026

Anthony A. Yoseloff

Signature:	/s/ Anthony A. Yoseloff
Name/Title:	Anthony A. Yoseloff, Individually
Date:	05/28/2026