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Board member at Momentus (NASDAQ: MNTS) receives 6,039 RSUs, 913 shares

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

Momentus Inc. director Linda J. Reiners reported equity compensation activity. On May 18, 2026, she acquired 913 shares of Class A common stock through an exercise or conversion of a derivative security, bringing her direct common stock holdings to 2,115 shares.

She was also granted 6,039 Restricted Stock Units, each representing one share of Class A common stock. These RSUs will vest in full on the earlier of May 18, 2027 or the 2027 annual meeting, if she continues serving on the board through that date.

Positive

  • None.

Negative

  • None.
Insider Reiners Linda J.
Role null
Type Security Shares Price Value
Grant/Award Restricted Stock Units 6,039 $0.00 --
Exercise Class A Common Stock 913 $0.00 --
Holdings After Transaction: Restricted Stock Units — 6,039 shares (Direct, null); Class A Common Stock — 2,115 shares (Direct, null)
Footnotes (1)
  1. Each Restricted Stock Unite (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.
Shares acquired via exercise/conversion 913 shares Class A Common Stock acquired on May 18, 2026
Common shares held after transaction 2,115 shares Direct Class A Common Stock holdings following May 18, 2026
RSUs granted 6,039 RSUs Restricted Stock Units granted on May 18, 2026
RSU underlying shares 6,039 shares Each RSU equals one Class A Common share
RSU vesting date trigger May 18, 2027 Earlier of May 18, 2027 or 2027 annual meeting, with continued service
RSU exercise price $0.0000 per unit Conversion or exercise price on RSU grant
Restricted Stock Units financial
"The RSUs will vest in full on the earlier to occur of May 18, 2027 or the day of the 2027 Annual Meeting"
Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.
Class A Common Stock financial
"Each Restricted Stock Unite (RSU) represents a contingent right to receive one share of Momentus Inc. Class A Common Stock."
Class A common stock is a category of a company’s shares that carries a specific set of ownership rights—most commonly defined voting power and claims on dividends—set out in the company’s charter. For investors it matters because the class determines how much influence you have over corporate decisions, the share’s likely dividend and trading behavior, and how it compares in value to other share classes, like choosing a particular seat with different privileges at the company’s decision-making table.
Exercise or conversion of derivative security financial
"transaction_code_description: Exercise or conversion of derivative security"
Grant, award, or other acquisition financial
"transaction_code_description: Grant, award, or other acquisition"
contingent right financial
"Each Restricted Stock Unite (RSU) represents a contingent right to receive one share of Momentus Inc. Class A Common Stock."
Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED 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*
Reiners Linda J.
(Last)(First)(Middle)
C/O MOMENTUS INC.
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)
XDirector10% 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)
XForm 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)
CodeVAmount(A) or (D)Price
Class A Common Stock05/18/2026M913A$02,115D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Restricted Stock Units(1)05/18/2026A6,039 (2) (2)Class A Common Stock6,039$06,039D
Explanation of Responses:
1. Each Restricted Stock Unite (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-Fact05/20/2026
** Signature of Reporting PersonDate
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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transactions did Momentus (MNTS) director Linda Reiners report?

Linda Reiners reported acquiring 913 shares of Momentus Class A common stock via exercise or conversion and receiving a grant of 6,039 Restricted Stock Units, all dated May 18, 2026, as part of her board-related equity compensation.

How many Momentus (MNTS) shares does Linda Reiners hold after these transactions?

After the May 18, 2026 transaction, Linda Reiners directly holds 2,115 shares of Momentus Class A common stock. In addition, she holds 6,039 Restricted Stock Units that may convert into an equal number of shares once the vesting conditions are satisfied.

What are the terms of Linda Reiners’ 6,039 RSU grant at Momentus (MNTS)?

Each RSU represents a contingent right to receive one share of Momentus Class A common stock. The 6,039 RSUs will vest in full on the earlier of May 18, 2027 or the 2027 annual meeting, subject to her continued board service through that vesting date.

Is Linda Reiners’ Form 4 for Momentus (MNTS) a stock purchase or compensation grant?

The Form 4 reflects equity compensation activity, not an open-market share purchase. It shows 913 shares acquired via derivative exercise or conversion and a grant of 6,039 Restricted Stock Units awarded as compensation tied to her role on the Momentus board.

Do Linda Reiners’ Momentus (MNTS) RSUs have an exercise price?

The RSU grant is shown with a price of $0.0000 per unit, meaning no cash exercise price is required. Instead, each of the 6,039 RSUs provides a contingent right to receive one share of Class A common stock once the vesting conditions are met.