[Form 4] Momentus Inc. Insider Trading Activity

Rhea-AI Filing Summary

Ensler Lon reported acquisition or exercise transactions in this Form 4 filing.

Momentus Inc. reported that Chief Financial Officer Lon Ensler received two grants of Restricted Stock Units on February 27, 2026. One grant covers 3,606 Restricted Stock Units and the other covers 8,486 Restricted Stock Units, each at a price of $0.00 per unit, held as direct ownership.

Each Restricted Stock Unit represents a contingent right to receive one share of Momentus Class A common stock. The 3,606-unit grant vests in four equal annual installments from the vesting commencement date, and the 8,486-unit grant vests in three equal annual installments, in each case subject to the executive’s continued employment.

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

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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^*

Ensler Lon

(Last) (First) (Middle)

3901 N. FIRST STREET

(Street)

SAN JOSE CA 95134

(City) (State) (Zip)

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

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

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

3. Date of Earliest Transaction (Month/Day/Year)
02/27/2026

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

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

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

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

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)	02/27/2026		A		3,606		(2)	(2)	Class A Common Stock	3,606	$0	3,606	D
Restricted Stock Units	(1)	02/27/2026		A		8,486		(3)	(3)	Class A Common Stock	8,486	$0	8,486	D

Explanation of Responses:

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

2. Represents a grant of Restricted Stock Units, which vest in four equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

3. Represents a grant of Restricted Stock Units, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

	/s/ Lon Ensler	03/03/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
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** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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FAQ

What did Momentus (MNTS) CFO Lon Ensler report on this Form 4?

Lon Ensler reported receiving two grants of Restricted Stock Units from Momentus Inc. on February 27, 2026. The awards total 3,606 units in one grant and 8,486 units in another, both recorded as direct ownership at a price of $0.00 per unit.

How many Restricted Stock Units did the Momentus CFO receive?

The Momentus CFO received 3,606 Restricted Stock Units in one grant and 8,486 in another. Each unit is a contingent right to one share of Class A common stock, subject to separate multi-year vesting schedules tied to continued employment with the company.

When were the Restricted Stock Units granted to the Momentus CFO?

The Restricted Stock Units were granted on February 27, 2026. Both grants were reported at a transaction price of $0.00 per unit and are classified as derivative securities that convert into Class A common stock as they vest over the specified multi‑year schedules.

What does each Momentus Restricted Stock Unit represent for the CFO awards?

Each Restricted Stock Unit represents a contingent right to receive one share of Momentus Inc. Class A common stock. The units only convert into shares as they vest over time, conditioned on the executive’s continued employment through each applicable vesting date.

How do the vesting schedules work for the CFO’s Momentus RSU grants?

The 3,606-unit grant vests in four equal annual installments from the vesting commencement date, requiring continued employment on each vesting date. The 8,486‑unit grant vests in three equal annual installments, also conditioned on the executive remaining employed through each vesting milestone.

Are the Momentus CFO’s new RSUs direct or indirect holdings?

The reported Restricted Stock Units are held as direct ownership by the CFO. The filing classifies both transactions as direct, with no footnote indicating that the awards are held through a separate entity or subject to another party’s voting or investment control.