Momentus (MNTS) director Brian Kabot buys shares and receives 6,039 RSUs

Rhea-AI Filing Summary

Momentus Inc. director Brian Kabot increased his stake through a mix of open-market buying and equity awards. On May 19, he bought 250 shares of Class A Common Stock in the open market at $5.615 per share, bringing his direct ownership to 4,458 shares.

On May 18, he acquired 913 shares of Class A Common Stock at no cost through an exercise or conversion of a derivative security. He was also granted 6,039 Restricted Stock Units (RSUs), each representing a right to receive one share of Class A Common Stock. These RSUs vest in full on the earlier of May 18, 2027 or the 2027 Annual Meeting, subject to his continued service on the Board.

Insider Trade Summary

Net Buyer: 250 shares ($1,404)

Net Buy 3 txns

Insider Kabot Brian

Role null

Bought 250 shs ($1K)

Type	Security	Shares	Price	Value
Purchase	Class A Common Stock	250	$5.615	$1K
Grant/Award	Restricted Stock Units	6,039	$0.00	--
Exercise	Class A Common Stock	913	$0.00	--

Holdings After Transaction: Class A Common Stock — 4,458 shares (Direct, null); Restricted Stock Units — 6,039 shares (Direct, null)

Footnotes (1)

1. Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of Momentus Inc. Class A Common Stock. The RSUs will vest in full on the earlier to occur of May 18, 2027 or the day of the 2027 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

Key Figures

Open-market purchase: 250 shares at $5.615 Shares owned after purchase: 4,458 shares Derivative exercise acquisition: 913 shares at $0.0000 +2 more

5 metrics

Open-market purchase 250 shares at $5.615 Class A Common Stock bought on May 19, 2026

Shares owned after purchase 4,458 shares Direct Class A Common Stock holdings after May 19, 2026

Derivative exercise acquisition 913 shares at $0.0000 Class A Common Stock from derivative exercise on May 18, 2026

RSU grant size 6,039 RSUs Restricted Stock Units granted on May 18, 2026

RSU vesting date May 18, 2027 Vests on earlier of May 18, 2027 or 2027 Annual Meeting

Key Terms

Restricted Stock Unit (RSU), open-market purchase, derivative exercise/conversion, vest in full

4 terms

Restricted Stock Unit (RSU) financial

"Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of Momentus Inc. Class A Common Stock."

A restricted stock unit (RSU) is a promise from a company to give an employee company shares (or cash equal to their value) at a future date if certain conditions are met, such as staying with the company or hitting performance targets. For investors, RSUs matter because when they convert into actual shares they increase the number of shares available and can create selling pressure as employees cash out—think of them as a future paycheck paid in company stock.

open-market purchase financial

"transaction_action: open-market purchase"

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

derivative exercise/conversion financial

"transaction_action: derivative exercise/conversion"

vest in full financial

"The RSUs will vest in full on the earlier to occur of May 18, 2027 or the day of the 2027 Annual Meeting"

Form 4 Insider Transactions: What Each Field Means →

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Kabot Brian

(Last) (First) (Middle)

1762 AUTOMATION PARKWAY

(Street)

SAN JOSE CALIFORNIA 95131

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Momentus Inc. [ MNTS ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/18/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock	05/18/2026		M		913	A	$0	4,208	D
Class A Common Stock	05/19/2026		P		250	A	$5.615	4,458	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Restricted Stock Units	(1)	05/18/2026		A		6,039		(2)	(2)	Class A Common Stock	6,039	$0	6,039	D

Explanation of Responses:

1. Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of Momentus Inc. Class A Common Stock.

2. The RSUs will vest in full on the earlier to occur of May 18, 2027 or the day of the 2027 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

	/s/ John Rood, Attorney-in-Fact	05/20/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transactions did Brian Kabot report for Momentus Inc. (MNTS)?

Brian Kabot reported several transactions in Momentus Inc. stock. He bought 250 Class A Common shares in the open market, acquired 913 shares via derivative exercise, and received 6,039 Restricted Stock Units that convert into shares upon future vesting.

How many Momentus Inc. (MNTS) shares does Brian Kabot hold after these transactions?

After these transactions, Brian Kabot directly owns 4,458 shares of Momentus Inc. Class A Common Stock. This figure reflects his position following the May 19, 2026 open-market purchase and the May 18, 2026 derivative exercise acquisition.

What price did Brian Kabot pay for his open-market purchase of MNTS shares?

Brian Kabot’s open-market purchase of Momentus Inc. Class A Common Stock was at a price of $5.615 per share. He bought 250 shares in this transaction, modestly increasing his direct equity stake in the company.

What are the terms of the 6,039 Restricted Stock Units granted to Brian Kabot at MNTS?

Brian Kabot received 6,039 Restricted Stock Units, each representing one share of Momentus Inc. Class A Common Stock. These RSUs vest in full on the earlier of May 18, 2027 or the 2027 Annual Meeting, subject to his continued Board service.

How did Brian Kabot acquire additional MNTS shares besides the open-market purchase?

Besides his open-market purchase, Brian Kabot acquired 913 shares of Momentus Inc. Class A Common Stock at no cost by exercising or converting a derivative security. This non-cash transaction increased his direct share ownership as reported in the filing.