Lon Ensler - 19 May 2026 Form 4 Insider Report for Momentus Inc. (MNTS)

Reporting relationship: Chief Financial Officer
Issuer ticker: MNTS
Reported as of: 19 May 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 21 May 2026, 19:24:11 UTC
Prior SEC filing: 03 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ John Rood, Attorney-in-Fact

Key filing fact

Lon Ensler filed Form 4 for Momentus Inc. (MNTS) on 21 May 2026.

Key facts

This page summarizes Lon Ensler's Form 4 filing for Momentus Inc. (MNTS).
2 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 21 May 2026, 19:24.

Change

Previous filing in this sequence was filed on 03 Mar 2026.
Current net transaction value: $0.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002018153 Primary reporting owner

Ensler Lon

Relationship: Chief Financial Officer
Address: 1762 AUTOMATION PARKWAY, SAN JOSE
Signature: /s/ John Rood, Attorney-in-Fact
Signature date: 21 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

MNTS transaction

Class A Common Stock

Award

Transaction value
Shares: +5,405
Change %
Price: $0.000000^*
Shares after: 5,405
Date: 19 May 2026
Ownership: Direct

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

MNTS transaction Derivative

Restricted Stock Units

Award

Transaction value
Shares: +15,107
Change %: +178%
Price: $0.000000^*
Shares after: 23,593
Date: 19 May 2026
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 15,107
Exercise price
Footnotes: F1, F2

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 2 footnotes

Footnote F1

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

Footnote F2

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