Linda J. Reiners - 18 May 2026 Form 4 Insider Report for Momentus Inc. (MNTS)

Reporting relationship: Director
Issuer ticker: MNTS
Reported as of: 18 May 2026
Net transaction value: $0
SEC form: 4
Accepted by SEC: 20 May 2026, 20:15:35 UTC
Prior SEC filing: 03 Jul 2025
Source filing: View source filing
Reporting owner signature: /s/ John Rood, Attorney-in-Fact

Key filing fact

Linda J. Reiners filed Form 4 for Momentus Inc. (MNTS) on 20 May 2026.

Key facts

This page summarizes Linda J. Reiners's Form 4 filing for Momentus Inc. (MNTS).
2 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 20 May 2026, 20:15.

Change

Previous filing in this sequence was filed on 03 Jul 2025.
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 0001873933 Primary reporting owner

Reiners Linda J.

Relationship: Director
Address: C/O MOMENTUS INC., 1762 AUTOMATION PARKWAY, SAN JOSE
Signature: /s/ John Rood, Attorney-in-Fact
Signature date: 20 May 2026

Reported non-derivative transactions

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

MNTS transaction

Class A Common Stock

Options Exercise

Transaction value
Shares: +913
Change %: +76%
Price: $0.000000^*
Shares after: 2,115
Date: 18 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: +6,039
Change %
Price: $0.000000^*
Shares after: 6,039
Date: 18 May 2026
Ownership: Direct
Underlying class: Class A Common Stock
Underlying amount: 6,039
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

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.