Jon Layman - 19 May 2026 Form 4/A - Amendment Insider Report for Momentus Inc. (MNTS)

Reporting relationship: Chief Legal Officer
Issuer ticker: MNTS
Reported as of: 19 May 2026
Net transaction value: $0
SEC form: 4/A - Amendment
Accepted by SEC: 21 May 2026, 19:10:14 UTC
Original report date: 21 May 2026
Prior SEC filing: 03 Mar 2026
Source filing: View source filing
Reporting owner signature: /s/ John Rood, Attorney-in-Fact

Key filing fact

Jon Layman filed Form 4/A - Amendment for Momentus Inc. (MNTS) on 21 May 2026.

Key facts

This page summarizes Jon Layman's Form 4/A - Amendment filing for Momentus Inc. (MNTS).
2 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 21 May 2026, 19:10.

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/A - Amendment disclosures.

View source filing

Reporting Owners (1)

CIK 0001857583 Primary reporting owner

Layman Jon

Relationship: Chief Legal Officer
Address: C/O MOMENTUS INC., 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: +14,270
Change %
Price: $0.000000^*
Shares after: 14,270
Date: 19 May 2026
Ownership: Direct
Footnotes: F1

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: F2, F3, F4

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 4 footnotes

Footnote F1

This first amendment to the Form 4 filed by the Reporting Person on 05/21/2026 indicates a correction to the amount of securities acquired.

Footnote F2

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

Footnote F3

This first amendment to the Form 4 filed by the Reporting Person on 05/21/2026 indicates a correction to the amount of derivative securities acquired.

Footnote F4

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.