Sec Form 13D Filing - Prime Movers Lab Fund I LP @ MOMENTUS INC WT EXP 05/15/26

Insider filing report for Changes in Beneficial Ownership

Schedule 13G & 13D forms are used to report a party's ownership of stock which exceeds 5% of a company's total stock issue.
Schedule 13G is a shorter version of Schedule 13D with fewer reporting requirements.

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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, DC 20549

SCHEDULE 13D

Under the Securities Exchange Act of 1934

(Amendment No. 6)*

MOMENTUS INC.

(Name of Issuer)

Common Stock, par value $0.00001 per share

(Title of Class of Securities)

60879E 101

(CUSIP Number)

Taylor Frankel

c/o Prime Movers Lab

P.O. Box 12829

Jackson, WY 83002

307-203-5036

(Name, Address and Telephone Number of Person
Authorized to Receive Notices and Communication)

September 7, 2023

(Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of §240.13d-1(e), §240.13d‑1(f) or §240.13d-1(g), check the following box: [ ]

The information required on the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934 (Act) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No. 60879E 101

SCHEDULE 13D

1	NAMES OF REPORTING PERSONS

		Prime Movers Lab Fund I LP

2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP					(a) ☒
						(b) ☐

3	SEC USE ONLY

4	SOURCE OF FUNDS (See Instructions)

		WC

5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)					☐

		Not Applicable
6	CITIZENSHIP OR PLACE OF ORGANIZATION

		Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH			7	SOLE VOTING POWER

					-0-

			8	SHARED VOTING POWER

					222,364

			9	SOLE DISPOSITIVE POWER

					-0-

			10	SHARED DISPOSITIVE POWER

					222,364

11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

		222,364

12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (See Instructions)					☐


13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

		11.4%(1)

14	TYPE OF REPORTING PERSON (See Instructions)

		PN

1	The percentages used herein and in the rest of this Schedule 13D calculated based on the approximately 1,957,307 shares of common stock outstanding as of August 23, 2023, as reported in the Issuer’s Registration Statement on Form 8-K filed with the Securities and Exchange Commission on August 22, 2023.

CUSIP No. 60879E 101

SCHEDULE 13D

1	NAMES OF REPORTING PERSONS

		Momentus PML SPV 1 LP

2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP					(a) ☒
						(b) ☐

3	SEC USE ONLY

4	SOURCE OF FUNDS (See Instructions)

		WC

5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)					☐

		Not Applicable
6	CITIZENSHIP OR PLACE OF ORGANIZATION

		Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH			7	SOLE VOTING POWER

					-0-

			8	SHARED VOTING POWER

					88,142

			9	SOLE DISPOSITIVE POWER

					-0-

			10	SHARED DISPOSITIVE POWER

					88,142

11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

		88,142

12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (See Instructions)					☐


13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

		4.5%

14	TYPE OF REPORTING PERSON (See Instructions)

		PN

CUSIP No. 60879E 101

SCHEDULE 13D

1	NAMES OF REPORTING PERSONS

		Momentus PML SPV 2 LP

2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP					(a) ☒
						(b) ☐

3	SEC USE ONLY

4	SOURCE OF FUNDS (See Instructions)

		WC

5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)					☐

		Not Applicable
6	CITIZENSHIP OR PLACE OF ORGANIZATION

		Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH			7	SOLE VOTING POWER

					-0-

			8	SHARED VOTING POWER

					17,367

			9	SOLE DISPOSITIVE POWER

					-0-

			10	SHARED DISPOSITIVE POWER

					17,367

11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
						& #xA0;
		17,367

12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (See Instructions)					☐


13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

		0.9%

14	TYPE OF REPORTING PERSON (See Instructions)

		PN

CUSIP No. 60879E 101

SCHEDULE 13D

1	NAMES OF REPORTING PERSONS

		Momentus PML SPV 3 LP

2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP					(a) ☒
						(b) ☐

3	SEC USE ONLY

4	SOURCE OF FUNDS (See Instructions)

		WC

5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)					☐

		Not Applicable
6	CITIZENSHIP OR PLACE OF ORGANIZATION

		Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH			7	SOLE VOTING POWER

					-0-

			8	SHARED VOTING POWER

					43,075

			9	SOLE DISPOSITIVE POWER

					-0-

			10	SHARED DISPOSITIVE POWER

					43,075

11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

		43,075

12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (See Instructions)					☐


13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

		2.2%

14	TYPE OF REPORTING PERSON (See Instructions)

		PN

CUSIP No. 60879E 101

SCHEDULE 13D

1	NAMES OF REPORTING PERSONS

		Prime Movers Growth Fund I LP

2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP					(a) ☒
						(b) ☐

3	SEC USE ONLY

4	SOURCE OF FUNDS (See Instructions)

		WC

5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)					☐

		Not Applicable
6	CITIZENSHIP OR PLACE OF ORGANIZATION

		Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH			7	SOLE VOTING POWER

					-0-

			8	SHARED VOTING POWER

					37,159(2)

			9	SOLE DISPOSITIVE POWER

					-0-

			10	SHARED DISPOSITIVE POWER

					37,159(2)

11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

		37,159(2)

12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (See Instructions)					☐


13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

		1.0%

14	TYPE OF REPORTING PERSON (See Instructions)

		PN


2	Includes (i) 17,159 shares held by Prime Movers Growth Fund I LP (“PM Growth”), and (ii) a warrant to purchase 20,000 shares that is exercisable within 60 days of September 13, 2023.

CUSIP No. 60879E 101

SCHEDULE 13D

1	NAMES OF REPORTING PERSONS

		Prime Movers Lab GP I LLC

2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP					(a) ☒
						(b) ☐

3	SEC USE ONLY

4	SOURCE OF FUNDS (See Instructions)

		AF

5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)					☐

		Not Applicable
6	CITIZENSHIP OR PLACE OF ORGANIZATION

		Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH			7	SOLE VOTING POWER

					-0-

			8	SHARED VOTING POWER

					310,506(3)

			9	SOLE DISPOSITIVE POWER

					-0-

			10	SHARED DISPOSITIVE POWER

					310,506(3)

11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

		310,506(3)

12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (See Instructions)					☐


13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

		15.9%

14	TYPE OF REPORTING PERSON (See Instructions)

		OO

Includes (i) 222,364 shares held by Prime Movers Lab Fund I LP (“PML”), and (ii) 88,142 shares held of record by Momentus PML SPV 1 LP (“PML SPV 1”), Prime Movers Lab GP I LLC (“PML GP”), is the general partner of PML and PML SPV 1. Dakin Sloss is the manager of PML GP and may be deemed to have or share beneficial ownership of the shares held by PML and PML SPV 1.

CUSIP No. 60879E 101

SCHEDULE 13D

1	NAMES OF REPORTING PERSONS

		Prime Movers Lab GP II LLC

2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP					(a) ☒
						(b) ☐

3	SEC USE ONLY

4	SOURCE OF FUNDS (See Instructions)

		AF

5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)					☐

		Not Applicable
6	CITIZENSHIP OR PLACE OF ORGANIZATION

		Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH			7	SOLE VOTING POWER

					-0-

			8	SHARED VOTING POWER

					60,442(4)

			9	SOLE DISPOSITIVE POWER

					-0-

			10	SHARED DISPOSITIVE POWER

					60,442(4)

11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

		60,442(4)

12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (See Instructions)					☐


13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

		3.1%

14	TYPE OF REPORTING PERSON (See Instructions)

		OO

Includes (i) 17,367 shares held of record by Momentus PML SPV 2 LP (“PML SPV 2”) and (ii) 43,075 shares held of record by Momentus PMS SPV3 LP (“PML SPV 3”). Prime Movers Lab GP II LLC (“PML GP II”) is the general partner of PML SPV 2 and PML SPV 3. Dakin Sloss is the manager of PML GP II and may be deemed to have or share beneficial ownership of the shares held by PML SPV 2 and PML SPV 3.

CUSIP No. 60879E 101

SCHEDULE 13D

1	NAMES OF REPORTING PERSONS

		Prime Movers Growth GP I LLC

2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP					(a) ☒
						(b) ☐

3	SEC USE ONLY

4	SOURCE OF FUNDS (See Instructions)

		AF

5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)					☐

		Not Applicable
6	CITIZENSHIP OR PLACE OF ORGANIZATION

		Delaware

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH			7	SOLE VOTING POWER

					-0-

			8	SHARED VOTING POWER

					37,159(5)

			9	SOLE DISPOSITIVE POWER

					-0-

			10	SHARED DISPOSITIVE POWER

					37,159(5)

11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

		37,159(5)

12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (See Instructions)					☐


13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

		1.9%

14	TYPE OF REPORTING PERSON (See Instructions)

		OO

Includes (i) 17,159 shares held by Prime Movers Growth Fund I LP (“PM Growth”) and (ii) a warrant to purchase 20,000 shares that is exercisable within 60 days of September 13, 2023. Prime Movers Growth GP I LLC (“PM Growth GP”), is the general partner of PM Growth. Dakin Sloss is the manager of PM Growth GP and may be deemed to have or share beneficial ownership of th e shares held by PM Growth.

CUSIP No. 60879E 101

SCHEDULE 13D

1	NAMES OF REPORTING PERSONS

		Dakin Sloss

2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP					(a) ☒
						(b) ☐

3	SEC USE ONLY

4	SOURCE OF FUNDS (See Instructions)

		AF

5	CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)					☐

		Not Applicable
6	CITIZENSHIP OR PLACE OF ORGANIZATION

		United States

NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH			7	SOLE VOTING POWER

					-0-

			8	SHARED VOTING POWER

					408,107(6)

			9	SOLE DISPOSITIVE POWER

					-0-

			10	SHARED DISPOSITIVE POWER

					408,107(6)

11	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

		408,107(6)

12	CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (See Instructions)					☐


13	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

		20,9%

14	TYPE OF REPORTING PERSON (See Instructions)

		IN

Includes (i) 222,364 shares held by Prime Movers Lab Fund I LP (“PML”), (ii) 88,142 shares held of record by Momentus PML SPV 1 LP (“PML SPV 1”), (iii) 17,367 shares held of record by Momentus PML SPV 2 LP (“PML SPV 2”), (iv) 43,075 shares held of record by Momentus PMS SPV3 LP (“PML SPV 3”), (v) 17,159 shares held by Prime Movers Growth Fund I LP (“PM Growth”), and (vi) a warrant to purchase 20,000 shares that is exercisable within 60 days of September 13, 2023. Prime Movers Lab GP I LLC (“PML GP”) is the general partner of PML and PML SPV 1. Prime Movers Lab GP II LLC (“PML GP II”) is the general partner of PML SPV 2 and PML SPV 3. Prime Movers Growth GP I LLC (“PM Growth GP”) is the general partner of PM Growth. Dakin Sloss is the manager of PML GP, PML GP II and PM Growth GP and may be deemed to have or share beneficial ownership of the shares held by PML, PML SPV 1, PML SPV 2, PML SPV 3 and PM Growth.

EXPLANATORY NOTE

This Amendment No. 6 (this “Amendment No. 6”) to the Statement on Schedule 13D (as amended, the “Statement”) is being filed with the Securities and Exchange Commission (the “Commission”) relating to the common stock, par value $.00001 per share of Momentus Inc., a corporation organized under the laws of the state of Delaware (the “Issuer”). This Amendment amends and supplements the Statement originally filed on October 8, 2021 with the Commission. Unless otherwise defined herein, capitalized terms used herein shall have the meanings ascribed thereto in the Statement. Except as otherwise provided herein, each Item of the Schedule 13D remains unchanged.

SIGNATURES

After reasonable inquiry and to the best of its knowledge and belief, the undersigned hereby certify that the information set forth in this statement is true, complete and correct.

Date: September 13, 2023

	PRIME MOVERS LAB FUND I LP MOMENTUS PML SPV 1 LP

	By:	Prime Movers Lab GP I LLC, General Partner
	By:	/s/ Taylor Frankel
	Name:	Taylor Frankel
	Title:	Authorized Person

	PRIME MOVERS LAB GP I LLC
	By:	/s/ Taylor Frankel
	Name:	Taylor Frankel
	Title:	Authorized Person

	MOMENTUS PML SPV 2 LP MOMENTUS PML SPV 3 LP

	By:	Prime Movers Lab GP II LLC, General Partner
	By:	/s/ Taylor Frankel
	Name:	Taylor Frankel
	Title:	Authorized Person

	PRIME MOVERS LAB GP II LLC
	By:	/s/ Taylor Frankel
	Name:	Taylor Frankel
	Title:	Authorized Person

	PRIME MOVERS GROWTH FUND I LP

	By:	Prime Movers Growth GP I LLC, General Partner
	By:	/s/ Taylor Frankel
	Name:	Taylor Frankel
	Title:	Authorized Person

	PRIME MOVERS GROWTH GP I LLC
	By:	/s/ Taylor Frankel
	Name:	Taylor Frankel
	Title:	Authorized Person

	DAKIN SLOSS
		/s/ Dakin Sloss

Exhibit A

JOINT FILING AGREEMENT

PURSUANT TO RULE 13D-1(K)(1)

The undersigned acknowledge and agree that the Statement on Schedule 13D filed with the Securities and Exchange Commission on or about the date hereof with respect to the beneficial ownership by the undersigned of the Common Stock, par value $0.00001 per share, of Momentus Inc., a Delaware corporation, is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13D shall be filed on behalf of each of the undersigned that is named as a reporting person in such filing without the necessity of filing an additional joint filing agreement. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning it contained therein, but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that it knows or has reason to believe that such information is inaccurate. This joint filing agreement may be executed in any number of counterparts and all of such counterparts taken together shall constitute one and the same instrument.

Dated: September 13, 2023

	PRIME MOVERS LAB FUND I LP MOMENTUS PML SPV 1 LP

	By:	Prime Movers Lab GP I LLC, General Partner
	By:	/s/ Taylor Frankel
	Name:	Taylor Frankel
	Title:	Authorized Person

	PRIME MOVERS LAB GP I LLC
	By:	/s/ Taylor Frankel
	Name:	Taylor Frankel
	Title:	Authorized Person

	MOMENTUS PML SPV 2 LP MOMENTUS PML SPV 3 LP

	By:	Prime Movers Lab GP II LLC, General Partner
	By:	/s/ Taylor Frankel
	Name:	Taylor Frankel
	Title:	Authorized Person

	PRIME MOVERS LAB GP II LLC
	By:	/s/ Taylor Frankel
	Name:	Taylor Frankel
	Title:	Authorized Person

	PRIME MOVERS GROWTH FUND I LP

	By:	Prime Movers Growth GP I LLC, General Partner
	By:	/s/ Taylor Frankel
	Name:	Taylor Frankel
	Title:	Authorized Person

	PRIME MOVERS GROWTH GP I LLC
	By:	/s/ Taylor Frankel
	Name:	Taylor Frankel
	Title:	Authorized Person

	DAKIN SLOSS
		/s/ Dakin Sloss

Sec Form 13D Filing - Prime Movers Lab Fund I LP filing for MOMENTUS INC WT EXP 05/15/26 (MNTSW) - 2023-09-13