# EDGAR Filing Document

**Accession Number:** 0001781162
**File Stem:** 0001140361-25-039712
**Filing Date:** 2025-10
**Character Count:** 102896
**Document Hash:** 38b73aa76bf2ba6263beccb171230c75
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001140361-25-039712.hdr.sgml**: 20251030

**ACCESSION NUMBER**: 0001140361-25-039712

**CONFORMED SUBMISSION TYPE**: DEF 14A

**PUBLIC DOCUMENT COUNT**: 11

**CONFORMED PERIOD OF REPORT**: 20251124

**FILED AS OF DATE**: 20251029

**DATE AS OF CHANGE**: 20251030

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Momentus Inc.
- **CENTRAL INDEX KEY:** 0001781162
- **STANDARD INDUSTRIAL CLASSIFICATION:** GUIDED MISSILES & SPACE VEHICLES & PARTS [3760]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 841905538
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEF 14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-39128
- **FILM NUMBER:** 251432973

**BUSINESS ADDRESS:**
- **STREET 1:** 3901 N. FIRST STREET
- **CITY:** SAN JOSE
- **STATE:** CA
- **ZIP:** 95134
- **BUSINESS PHONE:** 6505647820

**MAIL ADDRESS:**
- **STREET 1:** 3901 N. FIRST STREET
- **CITY:** SAN JOSE
- **STATE:** CA
- **ZIP:** 95134

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Stable Road Acquisition Corp.
- **DATE OF NAME CHANGE:** 20190628

#### **TABLE OF CONTENTS**

### UNITED STATES <br>

### SECURITIES AND EXCHANGE COMMISSION <br>

#### Washington, D.C. 20549

### SCHEDULE 14A

### Proxy Statement Pursuant To Section 14(A) of <br>

### the Securities Exchange Act of 1934

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| | |
|:---|:---|
| Filed by the Registrant  | ☒  |
| Filed by a Party other than the Registrant  | ☐ |

---

Check the appropriate box:

☐<br> Preliminary Proxy Statement

☐ **Confidential, For Use of the Commission Only (as permitted by Rule 14a-6(e)(2))** 

☒<br> Definitive Proxy Statement

☐<br> Definitive Additional Materials

☐<br> Soliciting Material Pursuant to § 240.14a-12

---

| |
|:---|
| **MOMENTUS INC.**  |
| (Name of Registrant As Specified In Its Charter)  |
| (Name of Person(s) Filing Proxy Statement, if other than the Registrant) |

---

Payment of Filing Fee (Check the appropriate box):

☒<br> No fee required

☐<br> Fee paid previously with preliminary materials.

☐<br> Fee computed on table in exhibit required by Item 25 (b) per Exchange Act Rules 14a-6 (i) (1) and 0-11

------

#### **TABLE OF CONTENTS**
![](logo_momentus3.jpg)<br>

&nbsp;&nbsp;&nbsp;&nbsp;<br>

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|:---|:---|:---|
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Items of Business** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>1. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Convertible Notes and Warrants, and any future adjustments of the exercise price of the Warrants (the "Convertible Notes and Warrants Proposal"); <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>2. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the use of the Company's Equity Line of Credit and the exercise of certain Pre-Funded Warrants (the "Equity Line of Credit Proposal"); <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>3. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Inducement Warrants, and any future adjustments of the exercise price of the warrants (the "Inducement Warrant Proposal"); and <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>4. <br>Any postponement or adjournment of the Special Meeting to a later date or dates, if necessary or appropriate, to permit further solicitation and vote of proxies if there are insufficient votes to approve any of the proposals at the time of the Special Meeting (the "Adjournment Proposal").<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Special Meeting Details<br>You can vote if you are a stockholder of record as of the close of business on October 28, 2025.** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**The Special Meeting of Stockholders will be held in a virtual format only, via live webcast at *www.virtualshareholdermeeting.com/MNTS2025SM2.*** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**By order of the Board of Directors,**<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Jon Layman<br>Chief Legal Officer and Corporate Secretary<br>October 29, 2025** | ![](ny20057014x2_date.jpg) <br>| **Date and Time**<br>**November 24, 2025**<br>**9:00 a.m. Pacific Time**  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Items of Business** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>1. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Convertible Notes and Warrants, and any future adjustments of the exercise price of the Warrants (the "Convertible Notes and Warrants Proposal"); <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>2. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the use of the Company's Equity Line of Credit and the exercise of certain Pre-Funded Warrants (the "Equity Line of Credit Proposal"); <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>3. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Inducement Warrants, and any future adjustments of the exercise price of the warrants (the "Inducement Warrant Proposal"); and <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>4. <br>Any postponement or adjournment of the Special Meeting to a later date or dates, if necessary or appropriate, to permit further solicitation and vote of proxies if there are insufficient votes to approve any of the proposals at the time of the Special Meeting (the "Adjournment Proposal").<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Special Meeting Details<br>You can vote if you are a stockholder of record as of the close of business on October 28, 2025.** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**The Special Meeting of Stockholders will be held in a virtual format only, via live webcast at *www.virtualshareholdermeeting.com/MNTS2025SM2.*** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**By order of the Board of Directors,**<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Jon Layman<br>Chief Legal Officer and Corporate Secretary<br>October 29, 2025** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Items of Business** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>1. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Convertible Notes and Warrants, and any future adjustments of the exercise price of the Warrants (the "Convertible Notes and Warrants Proposal"); <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>2. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the use of the Company's Equity Line of Credit and the exercise of certain Pre-Funded Warrants (the "Equity Line of Credit Proposal"); <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>3. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Inducement Warrants, and any future adjustments of the exercise price of the warrants (the "Inducement Warrant Proposal"); and <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>4. <br>Any postponement or adjournment of the Special Meeting to a later date or dates, if necessary or appropriate, to permit further solicitation and vote of proxies if there are insufficient votes to approve any of the proposals at the time of the Special Meeting (the "Adjournment Proposal").<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Special Meeting Details<br>You can vote if you are a stockholder of record as of the close of business on October 28, 2025.** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**The Special Meeting of Stockholders will be held in a virtual format only, via live webcast at *www.virtualshareholdermeeting.com/MNTS2025SM2.*** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**By order of the Board of Directors,**<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Jon Layman<br>Chief Legal Officer and Corporate Secretary<br>October 29, 2025** | ![](ny20057014x2_where.jpg)<br>| **Where**<br>**Via livestream webcast at** <br>***www.virtualshareholdermeeting.com/MNTS2025SM2***  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Items of Business** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>1. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Convertible Notes and Warrants, and any future adjustments of the exercise price of the Warrants (the "Convertible Notes and Warrants Proposal"); <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>2. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the use of the Company's Equity Line of Credit and the exercise of certain Pre-Funded Warrants (the "Equity Line of Credit Proposal"); <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>3. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Inducement Warrants, and any future adjustments of the exercise price of the warrants (the "Inducement Warrant Proposal"); and <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>4. <br>Any postponement or adjournment of the Special Meeting to a later date or dates, if necessary or appropriate, to permit further solicitation and vote of proxies if there are insufficient votes to approve any of the proposals at the time of the Special Meeting (the "Adjournment Proposal").<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Special Meeting Details<br>You can vote if you are a stockholder of record as of the close of business on October 28, 2025.** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**The Special Meeting of Stockholders will be held in a virtual format only, via live webcast at *www.virtualshareholdermeeting.com/MNTS2025SM2.*** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**By order of the Board of Directors,**<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Jon Layman<br>Chief Legal Officer and Corporate Secretary<br>October 29, 2025** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Items of Business** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>1. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Convertible Notes and Warrants, and any future adjustments of the exercise price of the Warrants (the "Convertible Notes and Warrants Proposal"); <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>2. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the use of the Company's Equity Line of Credit and the exercise of certain Pre-Funded Warrants (the "Equity Line of Credit Proposal"); <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>3. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Inducement Warrants, and any future adjustments of the exercise price of the warrants (the "Inducement Warrant Proposal"); and <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>4. <br>Any postponement or adjournment of the Special Meeting to a later date or dates, if necessary or appropriate, to permit further solicitation and vote of proxies if there are insufficient votes to approve any of the proposals at the time of the Special Meeting (the "Adjournment Proposal").<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Special Meeting Details<br>You can vote if you are a stockholder of record as of the close of business on October 28, 2025.** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**The Special Meeting of Stockholders will be held in a virtual format only, via live webcast at *www.virtualshareholdermeeting.com/MNTS2025SM2.*** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**By order of the Board of Directors,**<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Jon Layman<br>Chief Legal Officer and Corporate Secretary<br>October 29, 2025** | **Your Vote is Important**<br>**Please carefully review the proxy materials and follow the instructions below to cast your vote as soon as possible in advance of the meeting.**  | **Your Vote is Important**<br>**Please carefully review the proxy materials and follow the instructions below to cast your vote as soon as possible in advance of the meeting.**  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Items of Business** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>1. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Convertible Notes and Warrants, and any future adjustments of the exercise price of the Warrants (the "Convertible Notes and Warrants Proposal"); <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>2. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the use of the Company's Equity Line of Credit and the exercise of certain Pre-Funded Warrants (the "Equity Line of Credit Proposal"); <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>3. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Inducement Warrants, and any future adjustments of the exercise price of the warrants (the "Inducement Warrant Proposal"); and <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>4. <br>Any postponement or adjournment of the Special Meeting to a later date or dates, if necessary or appropriate, to permit further solicitation and vote of proxies if there are insufficient votes to approve any of the proposals at the time of the Special Meeting (the "Adjournment Proposal").<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Special Meeting Details<br>You can vote if you are a stockholder of record as of the close of business on October 28, 2025.** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**The Special Meeting of Stockholders will be held in a virtual format only, via live webcast at *www.virtualshareholdermeeting.com/MNTS2025SM2.*** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**By order of the Board of Directors,**<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Jon Layman<br>Chief Legal Officer and Corporate Secretary<br>October 29, 2025** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Items of Business** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>1. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Convertible Notes and Warrants, and any future adjustments of the exercise price of the Warrants (the "Convertible Notes and Warrants Proposal"); <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>2. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the use of the Company's Equity Line of Credit and the exercise of certain Pre-Funded Warrants (the "Equity Line of Credit Proposal"); <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>3. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Inducement Warrants, and any future adjustments of the exercise price of the warrants (the "Inducement Warrant Proposal"); and <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>4. <br>Any postponement or adjournment of the Special Meeting to a later date or dates, if necessary or appropriate, to permit further solicitation and vote of proxies if there are insufficient votes to approve any of the proposals at the time of the Special Meeting (the "Adjournment Proposal").<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Special Meeting Details<br>You can vote if you are a stockholder of record as of the close of business on October 28, 2025.** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**The Special Meeting of Stockholders will be held in a virtual format only, via live webcast at *www.virtualshareholdermeeting.com/MNTS2025SM2.*** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**By order of the Board of Directors,**<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Jon Layman<br>Chief Legal Officer and Corporate Secretary<br>October 29, 2025** | ![](ny20057014x2_voteonline.jpg) <br>| **VOTE ONLINE**<br>**By November 23, 2025** <br>***www.proxyvote.com***  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Items of Business** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>1. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Convertible Notes and Warrants, and any future adjustments of the exercise price of the Warrants (the "Convertible Notes and Warrants Proposal"); <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>2. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the use of the Company's Equity Line of Credit and the exercise of certain Pre-Funded Warrants (the "Equity Line of Credit Proposal"); <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>3. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Inducement Warrants, and any future adjustments of the exercise price of the warrants (the "Inducement Warrant Proposal"); and <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>4. <br>Any postponement or adjournment of the Special Meeting to a later date or dates, if necessary or appropriate, to permit further solicitation and vote of proxies if there are insufficient votes to approve any of the proposals at the time of the Special Meeting (the "Adjournment Proposal").<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Special Meeting Details<br>You can vote if you are a stockholder of record as of the close of business on October 28, 2025.** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**The Special Meeting of Stockholders will be held in a virtual format only, via live webcast at *www.virtualshareholdermeeting.com/MNTS2025SM2.*** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**By order of the Board of Directors,**<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Jon Layman<br>Chief Legal Officer and Corporate Secretary<br>October 29, 2025** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Items of Business** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>1. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Convertible Notes and Warrants, and any future adjustments of the exercise price of the Warrants (the "Convertible Notes and Warrants Proposal"); <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>2. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the use of the Company's Equity Line of Credit and the exercise of certain Pre-Funded Warrants (the "Equity Line of Credit Proposal"); <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>3. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Inducement Warrants, and any future adjustments of the exercise price of the warrants (the "Inducement Warrant Proposal"); and <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>4. <br>Any postponement or adjournment of the Special Meeting to a later date or dates, if necessary or appropriate, to permit further solicitation and vote of proxies if there are insufficient votes to approve any of the proposals at the time of the Special Meeting (the "Adjournment Proposal").<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Special Meeting Details<br>You can vote if you are a stockholder of record as of the close of business on October 28, 2025.** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**The Special Meeting of Stockholders will be held in a virtual format only, via live webcast at *www.virtualshareholdermeeting.com/MNTS2025SM2.*** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**By order of the Board of Directors,**<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Jon Layman<br>Chief Legal Officer and Corporate Secretary<br>October 29, 2025** | ![](ny20057014x2_votephone.jpg) <br>| **VOTE BY PHONE**<br>**By November 23, 2025**<br>**1-800-690-6903**  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Items of Business** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>1. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Convertible Notes and Warrants, and any future adjustments of the exercise price of the Warrants (the "Convertible Notes and Warrants Proposal"); <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>2. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the use of the Company's Equity Line of Credit and the exercise of certain Pre-Funded Warrants (the "Equity Line of Credit Proposal"); <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>3. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Inducement Warrants, and any future adjustments of the exercise price of the warrants (the "Inducement Warrant Proposal"); and <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>4. <br>Any postponement or adjournment of the Special Meeting to a later date or dates, if necessary or appropriate, to permit further solicitation and vote of proxies if there are insufficient votes to approve any of the proposals at the time of the Special Meeting (the "Adjournment Proposal").<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Special Meeting Details<br>You can vote if you are a stockholder of record as of the close of business on October 28, 2025.** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**The Special Meeting of Stockholders will be held in a virtual format only, via live webcast at *www.virtualshareholdermeeting.com/MNTS2025SM2.*** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**By order of the Board of Directors,**<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Jon Layman<br>Chief Legal Officer and Corporate Secretary<br>October 29, 2025** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Items of Business** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>1. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Convertible Notes and Warrants, and any future adjustments of the exercise price of the Warrants (the "Convertible Notes and Warrants Proposal"); <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>2. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the use of the Company's Equity Line of Credit and the exercise of certain Pre-Funded Warrants (the "Equity Line of Credit Proposal"); <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>3. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Inducement Warrants, and any future adjustments of the exercise price of the warrants (the "Inducement Warrant Proposal"); and <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>4. <br>Any postponement or adjournment of the Special Meeting to a later date or dates, if necessary or appropriate, to permit further solicitation and vote of proxies if there are insufficient votes to approve any of the proposals at the time of the Special Meeting (the "Adjournment Proposal").<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Special Meeting Details<br>You can vote if you are a stockholder of record as of the close of business on October 28, 2025.** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**The Special Meeting of Stockholders will be held in a virtual format only, via live webcast at *www.virtualshareholdermeeting.com/MNTS2025SM2.*** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**By order of the Board of Directors,**<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Jon Layman<br>Chief Legal Officer and Corporate Secretary<br>October 29, 2025** | ![](ny20057014x2_votemail.jpg) <br>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | **VOTE BY MAIL**<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**By November 23, 2025**<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Vote Processing**<br>**c/o Broadridge**<br>**51 Mercedes Way** <br>**Edgewood, NY 11717**  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Items of Business** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>1. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Convertible Notes and Warrants, and any future adjustments of the exercise price of the Warrants (the "Convertible Notes and Warrants Proposal"); <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>2. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the use of the Company's Equity Line of Credit and the exercise of certain Pre-Funded Warrants (the "Equity Line of Credit Proposal"); <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>3. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Inducement Warrants, and any future adjustments of the exercise price of the warrants (the "Inducement Warrant Proposal"); and <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>4. <br>Any postponement or adjournment of the Special Meeting to a later date or dates, if necessary or appropriate, to permit further solicitation and vote of proxies if there are insufficient votes to approve any of the proposals at the time of the Special Meeting (the "Adjournment Proposal").<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Special Meeting Details<br>You can vote if you are a stockholder of record as of the close of business on October 28, 2025.** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**The Special Meeting of Stockholders will be held in a virtual format only, via live webcast at *www.virtualshareholdermeeting.com/MNTS2025SM2.*** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**By order of the Board of Directors,**<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Jon Layman<br>Chief Legal Officer and Corporate Secretary<br>October 29, 2025** |  |  |
| &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**Items of Business** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>1. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Convertible Notes and Warrants, and any future adjustments of the exercise price of the Warrants (the "Convertible Notes and Warrants Proposal"); <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>2. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the use of the Company's Equity Line of Credit and the exercise of certain Pre-Funded Warrants (the "Equity Line of Credit Proposal"); <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>3. <br>To approve, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Inducement Warrants, and any future adjustments of the exercise price of the warrants (the "Inducement Warrant Proposal"); and <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>4. <br>Any postponement or adjournment of the Special Meeting to a later date or dates, if necessary or appropriate, to permit further solicitation and vote of proxies if there are insufficient votes to approve any of the proposals at the time of the Special Meeting (the "Adjournment Proposal").<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Special Meeting Details<br>You can vote if you are a stockholder of record as of the close of business on October 28, 2025.** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**The Special Meeting of Stockholders will be held in a virtual format only, via live webcast at *www.virtualshareholdermeeting.com/MNTS2025SM2.*** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**By order of the Board of Directors,**<br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Jon Layman<br>Chief Legal Officer and Corporate Secretary<br>October 29, 2025** | ![](ny20057014x2_votemeeting.jpg) <br>| **VOTE DURING THE MEETING** <br>**&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**<br>**Via livestream webcast at** <br>***www.virtualshareholdermeeting.com/MNTS2025SM2*** |

---

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**Table of Contents**

---

| | |
|:---|:---|
| &nbsp;&nbsp;[PROXY STATEMENT](#tPS) | &nbsp;&nbsp;[1](#tPS) |
| [GENERAL INFORMATION](#tGI) | &nbsp;&nbsp;[1](#tGI) |
| [PROPOSAL NO. 1 CONVERTIBLE NOTES AND WARRANTS PROPOSAL](#tPROP1) | &nbsp;&nbsp;[7](#tPROP1) |
| [General](#tGEN1) | &nbsp;&nbsp;[7](#tGEN1) |
| [Background](#tBACK1) | &nbsp;&nbsp;[7](#tBACK1) |
| &nbsp;&nbsp;[Nasdaq Stockholder Approval Requirement](#tNSAR1) | &nbsp;&nbsp;[9](#tNSAR1) |
| [Consequences of Not Approving this Proposal](#tCNAP1) | &nbsp;&nbsp;[9](#tCNAP1) |
| [Vote Required](#tVR1) | [10](#tVR1) |
| [PROPOSAL NO. 2 EQUITY LINE OF CREDIT PROPOSAL](#tPROP2) | [11](#tPROP2) |
| [General](#tGEN2) | [11](#tGEN2) |
| [Background](#tBG) | [11](#tBG) |
| [Nasdaq Stockholder Approval Requirement](#tNSA) | [12](#tNSA) |
| [Consequences of Not Approving this Proposal](#tCNA) | [13](#tCNA) |
| [Vote Required](#tVR2) | [14](#tVR2) |
| [PROPOSAL NO. 3 INDUCEMENT WARRANT PROPOSAL](#tPROP3) | [15](#tPROP3) |

---

---

| | |
|:---|:---|
| [General](#tGEN3) | [15](#tGEN3) |
| &nbsp;&nbsp;&nbsp;[Description of the Inducement Agreement ](#tDIA3)<br>[and Inducement Warrants](#tDIA3) | [15](#tDIA3) |
| &nbsp;&nbsp;[Why We Need Stockholder Approval](#tWWN3) | [16](#tWWN3) |
| [Potential Effects of Approval of this Proposal](#tPEA3) | [16](#tPEA3) |
| [Potential Effects of Non-Approval of this Proposal](#tPEN3) | [16](#tPEN3) |
| [Vote Required](#tVR3) | [17](#tVR3) |
| [PROPOSAL NO. 4 ADJOURNMENT PROPOSAL](#tPROP4) | [18](#tPROP4) |
| &nbsp;&nbsp;[OTHER BUSINESS THAT MAY COME BEFORE THE SPECIAL MEETING](#tOBT) | [19](#tOBT) |
| [FORWARD-LOOKING STATEMENTS](#tFLS) | [19](#tFLS) |
| &nbsp;&nbsp;[SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT](#tSOC) | [20](#tSOC) |
| [STOCKHOLDER PROPOSALS](#tSP) | [21](#tSP) |
| [PROXY AUTHORIZATION](#tPA) | [22](#tPA) |

---

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![](logo_momentus3x1.jpg)<br>

#### 3901 N. First Street <br>

#### San Jose, California 95134

#### PROXY STATEMENT <br>

#### FOR THE SPECIAL MEETING OF STOCKHOLDERS <br>

#### TO BE HELD ON NOVEMBER 24, 2025 <br>

#### AT 9:00 A.M. PACIFIC TIME

#### GENERAL INFORMATION

#### What is included in these proxy materials? What is a proxy statement and what is a proxy?
The proxy materials for this Special Meeting of Stockholders (the "Special Meeting") of Momentus Inc., a Delaware corporation ("Momentus," the "Company," "our company," "we," "our," or "us"), include the Notice of Special Meeting, this Proxy Statement ("Proxy Statement") and a proxy card or voting instruction form. The Company has made these proxy materials available to you because you were a stockholder of record at the close of business on October 28, 2025.

Our principal executive offices are located at 3901 N. First Street, San Jose, California 95134.

A "proxy statement" is a document that U.S. Securities and Exchange Commission (the "SEC") regulations require us to give you when we ask you to sign a proxy designating individuals to vote on your behalf. The word "proxy" has two meanings. A "proxy" is the legal designation of another person to cast the votes entitled to be cast by the holder of the shares and is sometimes called a "proxy card." That other designated person is called a "proxy" and is sometimes referred to as a "proxy holder."

We have designated two of our officers as proxies for the Special Meeting. When you authorize a proxy via the Internet, by telephone or (if you have received paper copies of our proxy materials) by returning a proxy card, you appoint John Rood and Jon Layman as your proxies at the Special Meeting (the "proxy"), with full power of substitution by any of them. Even if you plan to attend the Special Meeting, we encourage you to authorize a proxy to vote your shares in advance via the Internet, by telephone or (if you have received paper copies of our proxy materials) by returning a proxy card. If you authorize a proxy via the Internet or by telephone, you do not need to return your proxy card.

The form of proxy and this Proxy Statement have been approved by our board of directors (the "Board") and are being provided to stockholders by the Board's authority. These materials were first made available or sent to you on or about October 29, 2025. Any reference in this Proxy Statement to attending the Special Meeting, including any reference to "in person" attendance, means attending by remote communication via live webcast on the Internet.

#### What am I voting on at the Special Meeting?
At the Special Meeting, our stockholders are asked to consider and vote upon:

&nbsp;&nbsp;&nbsp;&nbsp;• approving, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Convertible Notes and Warrants, and any future adjustments of the exercise price of the Warrants (the "Convertible Notes and Warrants Proposal");

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&nbsp;&nbsp;&nbsp;&nbsp;• approving, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the use of the Company's Equity Line of Credit and the exercise of certain Pre-Funded Warrants (the "Equity Line of Credit Proposal");

&nbsp;&nbsp;&nbsp;&nbsp;• approving, pursuant to Nasdaq listing rules, the issuance of Class A common stock in connection with the exercise of certain existing Inducement Warrants, and any future adjustments of the exercise price of the warrants (the "Inducement Warrant Proposal"); and

&nbsp;&nbsp;&nbsp;&nbsp;• any postponement or adjournment of the Special Meeting to a later date or dates, if necessary or appropriate, to permit further solicitation and vote of proxies if there are insufficient votes to approve any of the proposals at the time of the Special Meeting (the "Adjournment Proposal").

#### How does the Board recommend I vote?
The Board recommends that you vote as follows:

&nbsp;&nbsp;&nbsp;&nbsp;• **FOR** the Convertible Notes and Warrants Proposal.

&nbsp;&nbsp;&nbsp;&nbsp;• **FOR** the Equity Line of Credit Proposal.

&nbsp;&nbsp;&nbsp;&nbsp;• **FOR** the Inducement Warrant Proposal.

&nbsp;&nbsp;&nbsp;&nbsp;• **FOR** the Adjournment Proposal.

#### Will any other business not discussed in this Proxy Statement come before the Special Meeting?
No. Pursuant to the Amended and Restated Bylaws of the Company, as amended (the "Bylaws"), any business transacted at any special meeting of stockholders will be limited to the purposes stated in the notice of the meeting.

#### What does it mean to vote by proxy?
It means that you give someone else the right to vote your shares in accordance with your instructions. In this way, you ensure that your vote will be counted even if you are unable to attend the Special Meeting. If you properly sign and deliver your proxy but do not include specific instructions on how to vote, the individuals named as proxies will vote your shares as follows:

&nbsp;&nbsp;&nbsp;&nbsp;• **FOR** the Convertible Notes and Warrants Proposal.

&nbsp;&nbsp;&nbsp;&nbsp;• **FOR** the Equity Line of Credit Proposal.

&nbsp;&nbsp;&nbsp;&nbsp;• **FOR** the Inducement Warrant Proposal.

&nbsp;&nbsp;&nbsp;&nbsp;• **FOR** the Adjournment Proposal.

The individuals named as proxies will vote in their discretion on any other matter that may properly come before the Special Meeting or any postponement or adjournment of the Special Meeting.

#### Who is entitled to vote?
The Board has fixed the close of business on October 28, 2025 as the record date (the "Record Date") for the determination of stockholders entitled to notice of, and to vote at, the Special Meeting or any adjournment or postponement thereof. On the Record Date, there were 22,907,753 shares of common stock outstanding. Each share of common stock represents one vote that may be voted on each proposal that may come before the Special Meeting.

#### How many votes do I have?
Holders of record of shares of our common stock will be entitled to one vote for each share of common stock held by them on the Record Date and have the right to vote on all matters brought before the Special Meeting.

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#### How do I attend and submit my vote for the Special Meeting?
If you are a stockholder of record and your shares are registered directly in your name, you may vote:

&nbsp;&nbsp;&nbsp;&nbsp;• **By Internet**. Follow the instructions in the Proxy Materials or on the proxy card. You may vote via internet website address at www.proxyvote.com. Votes by internet must be submitted by 11:59 p.m. Eastern Time on November 23, 2025.

&nbsp;&nbsp;&nbsp;&nbsp;• **By Telephone**. If you received a printed copy of the proxy materials, follow the instructions on the proxy card. You may vote via telephone at 1-800-690-6903. Votes by telephone must be submitted by 11:59 p.m. Eastern Time on November 23, 2025.

&nbsp;&nbsp;&nbsp;&nbsp;• **By Mail**. If you received a printed copy of the proxy materials, complete, sign, date and mail your proxy card in the enclosed, postage-prepaid envelope provided or return your proxy card to Vote Processing, c/o Broadridge, 51 Mercedes Way, Edgewood, New York 11717. If you sign and return the enclosed proxy card but do not specify how you want your shares voted, they will be voted **FOR** the Convertible Notes and Warrants Proposal, **FOR** the Equity Line of Credit Proposal, **FOR** the Inducement Warrant Proposal, and **FOR** the Adjournment Proposal, and will be voted according to the discretion of the proxy holder upon such other matters that may properly come before the meeting or any adjournment or postponement thereof. If you are mailed, or otherwise receive or obtain, a proxy card or voting instruction form, and you choose to vote by internet or by telephone, you do not have to return your proxy card or voting instruction form. Votes submitted by mail must be received by November 23, 2025.

&nbsp;&nbsp;&nbsp;&nbsp;• **By Internet at the Special Meeting**. You may also vote in person virtually by attending the meeting at *www.virtualshareholdermeeting.com/MNTS2025SM2*. To attend the Special Meeting and vote your shares, you must provide the control number located on your proxy card.

If your shares of common stock are held in street name (held for your account by a broker or other nominee):

&nbsp;&nbsp;&nbsp;&nbsp;• **By Internet or By Telephone**. You will receive instructions from your broker or other nominee if you are permitted to vote by internet or telephone.

&nbsp;&nbsp;&nbsp;&nbsp;• **By Mail**. You will receive instructions from your broker or other nominee explaining how to vote your shares by mail.

We will be hosting our Special Meeting via live webcast only. Any stockholder can attend the Special Meeting live online at *www.virtualshareholdermeeting.com/MNTS2025SM2*. In order to attend the Special Meeting and vote, you must be a holder of record and provide the control number located on your proxy card. The webcast will start at 9:00 a.m. Pacific Time on November 24, 2025.

#### How do I submit questions for the Special Meeting?
You will be able to submit questions prior to the Special Meeting by visiting www.proxyvote.com and following the online instructions. Questions submitted prior to the Special Meeting must be submitted no later than 11:59 p.m. Eastern Time on November 23, 2025 (the day before the Special Meeting). You will be able to submit questions during the Special Meeting by visiting *www.virtualshareholdermeeting.com/MNTS2025SM2*. We will respond to questions as time permits, provided that they are relevant and applicable to the Special Meeting.

#### Who will count the vote?
A representative of Broadridge Financial Solutions, a third-party tabulator, will count the vote and act as the inspector of election.

#### How do I revoke or change a vote?
If you own common stock of record, you may revoke your proxy or change your voting instructions at any time before your shares are voted at the Special Meeting by delivering to the Corporate Secretary of the Company a written notice of revocation or a duly executed proxy via the Internet, by telephone or by returning

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a proxy card bearing a later date or by attending the Special Meeting and voting. A stockholder owning common stock in street name may revoke or change voting instructions by contacting the bank, brokerage firm, or other nominee holding the shares or by obtaining a legal proxy from such institution and voting at the Special Meeting.

#### What does it mean if I receive more than one proxy or voting instruction form?
It means your shares are registered in more than one account. Please complete and provide your voting instructions for all proxy cards and voting instruction cards that you receive. We encourage you to register all your accounts in the same name and address. Registered stockholders may contact our transfer agent, Continental Stock Transfer & Trust Company. Street name stockholders holding shares through a bank, broker or other nominee should contact their bank, broker or nominee and request consolidation of their accounts.

#### What constitutes a quorum?
The holders of one-third of the voting power of the shares of our common stock issued and outstanding and entitled to vote, in person or represented by proxy at the Special Meeting, constitute a quorum. A quorum is necessary to transact business at the Special Meeting.

#### What is the required vote to approve the proposals?
The affirmative vote of a majority of the voting power of the shares of our Class A common stock present in person or represented by proxy at the Special Meeting and are voted for or against the matter is required to approve the Convertible Notes and Warrants Proposal, the Equity Line of Credit Proposal, and the Inducement Warrant Proposal. The affirmative vote of a majority of the voting power of the shares of our Class A common stock present in person or represented by proxy at the Special Meeting is required to approve the Adjournment Proposal.

#### What is the effect of abstentions and broker non-votes?
Abstentions and broker non-votes will be treated as shares present for the purpose of determining the presence of a quorum for the transaction of business at the Special Meeting. A broker non-vote occurs when a bank, broker or other nominee holding shares for a beneficial owner submits a proxy for the Special Meeting without voting on a particular proposal, because the bank, broker or other nominee has not received instructions from the beneficial owner and does not have discretionary voting power with respect to that proposal. If you are a beneficial owner of shares held in street name and you do not instruct your broker how to vote your shares, the question of whether your broker will still be able to vote your shares depends on whether the New York Stock Exchange (the "NYSE") deems the particular proposal to be a "routine" matter. Although our shares of Class A common stock are listed with Nasdaq, the NYSE regulates broker-dealers and their discretion to vote on stockholder proposals. Under the NYSE rules applicable to brokers and other similar organizations that are subject to NYSE rules, such organizations may use their discretion to vote your "uninstructed shares" with respect to matters considered to be "routine" under NYSE rules, but not with respect to "non-routine" matters. Under such rules and interpretations, non-routine matters are matters that may substantially affect the rights or privileges of stockholders, such as mergers, stockholder proposals, elections of directors (even if not contested), executive compensation (including any advisory stockholder votes on executive compensation), and certain corporate governance proposals, even if management supported. We understand that the Adjournment Proposal will be considered "routine" by the NYSE and, accordingly, we believe that your broker may vote your shares on such proposal without instructions from you. We also understand that the Convertible Notes and Warrants Proposal, the Equity Line of Credit Proposal, and the Inducement Warrant Proposal are considered "non-routine" such that your broker, bank, or other agent may not vote your shares on such proposals in the absence of your voting instructions. Nevertheless, whether a proposal is "routine" or "non-routine" remains subject to the final determination of the NYSE.

We strongly encourage you to submit your voting instructions to your broker to ensure your shares of common stock are voted in accordance with your instructions at the Special Meeting.

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Abstentions will have no effect on the outcome of the vote on the Convertible Notes and Warrants Proposal or the Equity Line of Credit Proposal, or the Inducement Warrant Proposal. In addition, abstentions with respect to the Adjournment Proposal have the same effect as a vote "Against" the Adjournment Proposal.

#### Why are you holding a virtual Special Meeting?
The Special Meeting will be held by remote communication in a virtual meeting format only. We believe that the virtual meeting format will provide expanded access, improved communication and cost savings for our stockholders and the Company.

The Special Meeting will convene at 9:00 a.m. Pacific Time on November 24, 2025. We encourage you to access the Special Meeting prior to the start time leaving ample time for the check-in process.

#### How are proxies solicited and who bears the cost?
The accompanying proxy is solicited by and on behalf of the Board, and the cost of such solicitation will be borne by the Company. Solicitations may be made by mail, personal interview, telephone, and electronic communications by directors, officers and other Company employees without additional compensation. We have retained Laurel Hill to assist us in soliciting proxies in connection with the Special Meeting. The Company expects to pay Laurel Hill $7,500, plus expenses, for its services. We will bear the cost of the solicitation of the proxies, including postage, printing and handling. Broadridge Financial Solutions will distribute proxy materials to banks, brokers, and other nominees for forwarding to beneficial owners and will request brokerage houses and other custodians, nominees, and fiduciaries to forward soliciting material to the beneficial owners of the common stock held on the record date by such persons. We will reimburse brokerage houses and other custodians, nominees and fiduciaries for their expenses in forwarding solicitation materials.

#### What happens if the meeting is postponed or adjourned?
Your proxy may be voted at the postponed or adjourned meeting. You will still be able to change your proxy until it is voted.

#### How can I find out the results of the voting at the Special Meeting?
Preliminary voting results will be announced at the Special Meeting. Final voting results will be published in a Current Report on Form 8-K, or Form 8-K, that we expect to file with the SEC within four business days after the Special Meeting. If final voting results are not available to us in time to file a Form 8-K within four business days after the Special Meeting, we intend to file a Form 8-K to publish preliminary results and, within four business days after the final results are known to us, file an additional Form 8-K to publish the final results.

#### What if I have technical difficulties or trouble accessing the Special Meeting?
If you encounter any technical difficulties with the virtual meeting platform on the meeting day, please call the technical support number that will be posted on the virtual Special Meeting log-in page. Technical support will be available starting at 8:45 a.m. Pacific Time on November 24, 2025 and will remain available until the Special Meeting has ended.

#### What is "householding"?
SEC rules concerning the delivery of disclosure documents allow us or your broker to send a single set of our proxy materials to any household at which two or more of our stockholders reside, if we or your broker believe that the stockholders are members of the same family, unless we have received contrary instructions from one or more of the stockholders. This practice, referred to as "householding," benefits both you and the Company. It reduces the volume of duplicate information received at your household and helps to reduce our expenses. The rule applies to our annual reports, proxy statements, and information statements.

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We will undertake to deliver promptly, upon written or oral request, a separate copy to a stockholder at a shared address to which a single copy of the proxy materials was delivered. You may make a written request by sending a notification to: Corporate Secretary, Momentus Inc., 3901 N. First Street, San Jose, California 95134, providing your name, your shared address, and the address to which we should direct the additional copy of the proxy materials. Multiple stockholders sharing an address who have received one copy of a mailing and would prefer us to mail each stockholder a separate copy of future mailings should contact us at our principal executive offices. Additionally, if current stockholders with a shared address received multiple copies of a mailing and would prefer us to mail one copy of future mailings to stockholders at the shared address, notification of that request may also be made through our principal executive offices. Stockholders who participate in householding will continue to have access to and utilize separate proxy voting instructions

#### Who should I contact if I have any additional questions?
If you hold your shares directly, please contract an investor relations representative at *investors@momentus.space*. If your shares are held in street name, please contact the telephone number provided on your voting instruction form or contact your broker or nominee holder directly.

You may also contact the Proxy Solicitor at:

2 Robbins Lane, Suite 201 <br>

Jericho, New York 11753 <br>

Banks and Brokers Call (516) 933-3100 <br>

All Others Call Toll-Free (888) 742-1305

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#### PROPOSAL NO. 1 <br>

#### &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>

#### CONVERTIBLE NOTES AND WARRANTS PROPOSAL

#### General
Momentus is asking stockholders to approve, for purposes of complying with Nasdaq Listing Rule 5635(d), the potential issuance of shares of our Class A common stock to the holders of the Convertible Notes and Warrants in excess of 19.99% of our outstanding shares of Class A common stock pursuant to the Nasdaq Listing Rules, and any future adjustments of the exercise price of the warrants. The key terms of the Convertible Note, the Investor Warrants, the AIR Warrants, the Purchase Agreement, the Registration Rights Agreement, and the Security Agreement relating to this Convertible Notes and Warrants Proposal are as summarized below and as described in the Current Report on Form 8-K filed by the Company with the SEC on September 29, 2025 (the "Investor Form 8-K").

The information set forth in this proposal is further qualified in its entirety by reference to the full text of the forms the Convertible Note, the Investor Warrants, the AIR Warrants, the Purchase Agreement, the Registration Rights Agreement, and the Security Agreement, each attached as Exhibits 4.1, 4.2, 4.3, 10.1, 10.2, and 10.3, respectively, to the Investor Form 8-K. Stockholders are urged to carefully read these documents.

#### Background
On September 25, 2025, the Company entered into a securities purchase agreement (the "Purchase Agreement") with Yield Point NY, LLC (the "Investor"), pursuant to which the Company agreed to sell (the "Offering") (i) a Junior Secured Convertible Note having an aggregate principal amount of $1,630,435, maturing twelve months after the issue date, with original issue discount of 8%, convertible into shares of Class A common stock of the Company, par value $0.00001 per share ("Class A common stock" or "common stock") at a conversion price of $1.116 per share, and if not converted then amortized over the final six months concluding on the maturity date (the "Convertible Note"), and (ii) warrants to purchase up to 1,460,964 shares of Class A common stock at an exercise price of $1.40 per share (the "Investor Warrants"). The Company received approximately $1,500,000 in gross proceeds from the Offering.

*Securities Purchase Agreement* 

The Purchase Agreement contains representations and warranties of the Company and the Investor which are typical for transactions of this type. In addition, the Purchase Agreement contains customary covenants on the Company's part that are typical for transactions of this type, as well as the following additional covenants: (i) for as long as the Convertible Note remain outstanding, the Company agreed not to effect or enter into an Equity Line of Credit (as defined below) or agreement to effect any issuance by the Company or any of its subsidiaries involving a variable rate transaction, other than an "at the market" offering of common stock; and (ii) the Company agreed to hold a stockholder meeting within 60 days of the date of the Purchase Agreement at which the Company will solicit the stockholders' affirmative vote for approval of the issuance in excess of 19.9% of shares outstanding as of the date of the Purchase Agreement in accordance with the applicable law and rules and regulations of The Nasdaq Stock Market LLC ("Nasdaq").

The Purchase Agreement obligates the Company to indemnify the Investor and various related parties for certain losses including those resulting from (i) any misrepresentation or breach of any representation or warranty made by the Company, (ii) any breach of any obligation of the Company, and (iii) certain claims by third parties.

*Convertible Note and Warrants* 

The Convertible Note is a junior secured obligation of the Company and is secured by certain personal property of the Company, pursuant to a Security Agreement (as defined below). Unless earlier converted, the Convertible Note will mature in September 2026. The Convertible Note bears interest at a rate of 8% per annum, subject to increase in the event of default to the lesser of 18% per annum or the maximum rate permitted under applicable law. The Convertible Note, including interest accrued thereon, is convertible at

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any time, in whole or in part, at the option of the holder into shares of Class A common stock at a conversion price of $1.116 per share, subject to adjustment as set forth therein. The Convertible Note has a beneficial ownership limitation such that the Investor will not have the right to convert any portion of the Convertible Note if the Investor (together with its affiliates or any other persons acting together as a group with the Investor) would beneficially own in excess of 4.99% of the number of shares of Class A common stock outstanding immediately after giving effect to the issuance of Class A common stock issuable upon conversion of the Convertible Note, or, upon 61 days' prior written notice to the Company, 9.99% of the number of shares of Class A common stock outstanding immediately after giving effect to the issuance of Class A common stock issuable upon conversion of the Convertible Note. Commencing on the six-month anniversary of the date of the issuance of the Convertible Note, and on the same date every month thereafter, the Company shall make six equal amortization payments, with each payment being equal to one-sixth of the initial principal amount, plus all accrued but unpaid interest.

The Convertible Note also contains certain negative covenants, including prohibitions on the incurrence of indebtedness, liens, amendments to the Company's organizational documents, dividends, redemption, related party transactions and entry into any equity line of credit agreement or variable rate transactions other than an "at the market" offering of common stock. The Convertible Notes also contain standard and customary events of default including, but not limited to, failure to make payments when due, failure to observe or perform covenants or agreements contained in the Convertible Note, existence of a default or event of default under any of the Transaction Documents (as defined below), the bankruptcy or insolvency of the Company or any of its subsidiaries and unsatisfied judgments against the Company.

The Investor Warrants entitle the holder to purchase up to 1,460,964 shares of Class A common stock. The Investor Warrants are exercisable immediately and have a term of five years. The Investor Warrants each have an exercise price of $1.40 per share, subject to adjustment as set forth therein.

*AIR Warrants* 

Pursuant to the Purchase Agreement, the Company also sold to the Investor warrants to purchase up to $4,000,000 in principal amount of additional Convertible Notes and Investor Warrants (the "AIR Warrants"). The AIR Warrants are exercisable immediately and have a term of five years. The Company may require the holder of the AIR Warrants to exercise AIR Warrants with respect to no more than two times the average daily trading volume of the common stock for the five prior trading days at any time when such average daily trading price for the Class A common stock for the five prior trading days is at least 125% of the original conversion price of the Convertible Note.

*Registration Rights Agreement* 

In connection with the Purchase Agreement, the Company and the Investor entered into a Registration Rights Agreement (the "Registration Rights Agreement"), pursuant to which the Company has agreed to register the resale of the shares of Class A common stock issuable upon conversion and exercise of the Convertible Note, Investor Warrants and the AIR Warrants on a registration statement on Form S-3 (the "Registration Statement") to be filed with the SEC within 30 days after the date of Registration Rights Agreement and to cause the Registration Statement to be declared effective under the Securities Act of 1933, as amended (the "Securities Act"), no later than 45 calendar days after the initial filing deadline, in the event the registration statement is not subject to a full review by the SEC, or 90 calendar days after the initial filing deadline, in the event the registration statement is subject to a full review by the SEC, and in any event by the fifth business day after the date the Company is notified by the SEC that the registration statement will not be reviewed or will not be subject to further review. If certain of the Company's obligations under the Registration Rights Agreement are not met, the Company is required to pay partial liquidated damages to the Investor.

*Security Agreement* 

The Company also entered into a Security Agreement (the "Security Agreement") with the Investor, as collateral agent (the "Collateral Agent"), the Investor and such holders of the Convertible Notes as may be issued in the future (together with the Investor, the "Secured Parties"). Pursuant to the Security Agreement,

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the Secured Parties were granted a security interest in certain of the Company's personal property (the "Pledged Collateral") to secure the payment and performance of all of the Company's obligations under the Convertible Note, Investor Warrants, Purchase Agreement, Registration Rights Agreement, and Security Agreement (together, the "Transaction Documents").

#### Nasdaq Stockholder Approval Requirement
Listing Rule 5635(d) requires stockholder approval in connection with a transaction, other than a public offering, involving the sale or issuance by the issuer of common stock (or securities convertible into or exchangeable for common stock) equal to 20% or more of the common stock or 20% or more of the voting power of such company outstanding before the issuance for a price that is less than the lower of: (i) the closing price of the common stock immediately preceding the signing of the binding agreement for the issuance of such securities and (ii) the average closing price of the common stock for the five (5) trading days immediately preceding the signing of the binding agreement for the issuance of such securities (the "Minimum Price").

#### Potential Effects of Approval of this Proposal
If our stockholders approve this Proposal, we would be able to convert up to approximately $1.5 million in principal amount of debt to stockholders' equity by issuance of shares of our Class A common stock upon conversion of the Convertible Note, thus increasing the Company's stockholders' equity. While it is difficult to predict the total number of shares of Class A common stock we may issue under the Purchase Agreement, using the Floor Price (as such term is defined in the Convertible Note) of $0.22 as the Conversion Price (as such term is defined in the Convertible Note) for all principal and interest due under the Convertible Note, we estimate that we may issue as many as 6,818,182 shares of Class A common stock upon conversion of the Convertible Note, and 1,460,964 shares of Class A common stock upon exercise of the Investor Warrants.

The issuance of securities pursuant to conversion of the Convertible Note and exercise of the Investor Warrants will not affect the rights of the Company's existing stockholders, however, the issuance of the securities described in this Proposal would result in the issuance of over 20% of the Company's outstanding shares of Class A common stock on a pre-transaction basis and our stockholders will incur substantial dilution of their percentage ownership to the extent that the Investor fully converts the Convertible Note and fully exercises the Investor Warrants. Further, because of the possibility that the Conversion Price of the Convertible Note and the exercise price of the Investor Warrants may be further adjusted to a lower amount based upon the price of future issuances of our Class A common stock, stockholders may experience an even greater dilutive effect. Stockholder approval of this Proposal will apply to all issuances of shares of Class A common stock pursuant to the conversion of the Convertible Note and the exercise of the Investor Warrants. This also means that our current stockholders will own a smaller interest in us as a result of the conversion of the Convertible Note and exercise of the Investor Warrants, and therefore have less ability to influence significant corporate decisions requiring stockholder approval. Issuance of the shares underlying the Convertible Note and Investor Warrants could also have a dilutive effect on the book value per share and any future earnings per share. We have agreed to file a registration statement to permit the public resale of the Convertible Note shares and Investor Warrant shares. The influx of those shares into the public market could have a negative effect on the trading price of our Class A common stock.

#### Consequences of Not Approving this Proposal
If our stockholders do not approve this and we are not able to issue shares of our Class A common stock in connection with the conversion of the Convertible Note and exercise of the Investor Warrants below the Minimum Price, (i) we would be required to make repayments of the Convertible Note in substantial amounts of cash rather than in shares of Class A common stock, and (ii) the Pledged Collateral would continue to be subject to the security interest granted pursuant to the Security Agreement to secure such repayments.

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#### Vote Required
Assuming a quorum is present, the affirmative vote of a majority of the total votes cast on this proposal is required for approval of this Convertible Notes and Warrants Proposal. For purposes of the approval of this Convertible Notes and Warrants Proposal, abstentions and broker non-votes will have no effect on the result of the vote.

#### THE BOARD UNANIMOUSLY RECOMMENDS THAT <br>

#### YOU VOTE "FOR" THE CONVERTIBLE NOTES AND WARRANTS PROPOSAL.
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#### PROPOSAL NO. 2 <br>

#### &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>

#### EQUITY LINE OF CREDIT PROPOSAL

#### General
Momentus is asking stockholders to approve, for purposes of complying with Nasdaq Listing Rule 5635(d), the potential issuance of shares of our Class A common stock to the Investor in excess of 19.99% of our outstanding shares of Class A common stock pursuant to the Nasdaq Listing Rules. The key terms of the Pre-Funded Warrants, the Equity Purchase Agreement, and the EPA Registration Rights Agreement relating to this Equity Line of Credit Proposal are as summarized below and as described in the Investor Form 8-K.

The information set forth in this proposal is further qualified in its entirety by reference to the full text of the Pre-Funded Warrants, the Equity Purchase Agreement, and the EPA Registration Rights Agreement, each attached as Exhibits 4.4, 10.4, and 10.5, respectively, to the Investor Form 8-K. Stockholders are urged to carefully read these documents.

#### Background
*Equity Purchase Agreement* 

On September 25, 2025 (the "Execution Date"), the Company, entered into an equity purchase agreement ("Equity Purchase Agreement") with the Investor. Under the Equity Purchase Agreement, the Company has the right, but not the obligation, to direct the Investor to purchase up to $50,000,000 (the "Maximum Commitment Amount") in shares of Class A common stock of the Company upon satisfaction of certain terms and conditions contained in the Equity Purchase Agreement (the "Equity Line of Credit" or "ELOC"), including, without limitation, an effective registration statement filed with the SEC registering the resale of the shares of Put Stock (defined below) and the shares of Commitment Stock (defined below) and additional shares to be sold to the Investor from time to time under the Equity Purchase Agreement. The term of the Equity Purchase Agreement began on the Execution Date and ends on the earlier of (i) the date on which the Investor shall have purchased shares of Class A common stock issued, or that the Company shall be entitled to issue, per any applicable Put Notice in accordance with the terms and conditions of the Equity Purchase Agreement (the "Put Stock") equal to the Maximum Commitment Amount, (ii) the date that is thirty-six (36) months from the date the Registration Statement is declared effective, (iii) written notice of termination by the Company to the Investor (which shall not occur at any time that the Investor holds any of the shares of Put Stock, or within 30 days of the sale to the Investor of Put Stock), or (iv) written notice of termination by the Investor to the Company (the "Commitment Period").

During the Commitment Period, the Company may direct the Investor to purchase shares of Put Stock by delivering a notice (a "Put Notice") to the Investor. The Company shall, in its sole discretion, select the number of shares of Put Stock requested by the Company in each Put Notice. However, such amount may not exceed the Maximum Put Amount (as defined in the Equity Purchase Agreement). The purchase price to be paid by the Investor for the shares of Put Stock will be $1.24 per share.

In consideration for the Investor's execution and delivery of, and performance under the Equity Purchase Agreement, on the Execution Date, the Company in its discretion shall either (i) pay to the Investor in cash $750,000 ("Commitment Cash") or (ii) issue pre-funded warrants to purchase Class A common stock (the "Pre-Funded Warrant") to the Investor in a form acceptable to the Investor in its sole discretion and having an exercise price per share of $0.00001 (the "Commitment Stock") having a value of $750,000 based on closing price of the Class A common stock based on the shares price that is calculated the 5-day volume weighted average price of the Class A common stock beginning on the date that the Initial Registration Statement (defined below) is declared effective (the "Commitment Stock Price"). All of the shares of Commitment Stock were fully earned as of the Execution Date, and the issuance of the shares of Commitment Stock is not contingent upon any other event or condition, including, without limitation, the effectiveness of the Initial Registration Statement or the Company's submission of a Put Notice to the Investor and irrespective of any termination of the Equity Purchase Agreement.

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Under the Equity Purchase Agreement, the Company is obligated to file with the SEC, on or before October 25, 2025, a registration statement on Form S-3 (the "Initial Registration Statement") covering only the resale of the shares of Put Stock and Commitment Stock and to use its best efforts to have the Initial Registration Statement declared effective no later than November 24, 2025.

In addition, under applicable rules of Nasdaq, the Company may not issue or sell to the Investor under the Equity Purchase Agreement more than 19.99% of the shares of Class A common stock outstanding immediately prior to the execution of the Equity Purchase Agreement (the "Exchange Cap"), unless (i) the Company obtains stockholder approval to issue shares in excess of the Exchange Cap, or (ii) the average price per share paid by the Investor for all of the shares of Class A common stock that the Company directs the Investor to purchase pursuant to the Equity Purchase Agreement, if any, is equal to or greater than a price equal to the lower of (a) the official closing price of the Company's Class A common stock on Nasdaq immediately preceding the execution of the Equity Purchase Agreement, and (b) the average official closing price of the Company's Class A common stock on Nasdaq for the five consecutive trading days immediately preceding the execution of the Equity Purchase Agreement, so that the Exchange Cap limitation will not apply to issuances and sales of Class A common stock pursuant to the Equity Purchase Agreement. In any event, the Equity Purchase Agreement specifically provides that the Company may not issue or sell any shares of Class A common stock under the Equity Purchase Agreement if such issuance or sale would breach applicable rules of The Nasdaq Stock Market, LLC.

The Equity Purchase Agreement contains customary representations, warranties, agreements, and conditions to completing future sale transactions, indemnification rights and obligations of the parties. Among other things, the Investor represented to the Company, that it is an "accredited investor" (as such term is defined in Rule 501(a) of Regulation D under the Securities Act).

*Pre-Funded Warrant* 

The Pre-Funded Warrant certifies that, for value received, the Investor is entitled to be issued up to $750,000 of shares of Class A common stock based upon the Commitment Stock Price and has an initial exercise price of $0.00001 per share. The Pre-Funded Warrants may not be exercised if the aggregate number of shares of the Class A common stock beneficially owned by the holder would exceed 4.99% immediately after exercise thereof, which ownership cap may be increased by the holder up to 9.99% upon 61 days' prior notice.

*EPA Registration Rights Agreement* 

On the Effective Date, in connection with the Equity Purchase Agreement, the Company entered into a registration rights agreement with the Investor (the "EPA Registration Rights Agreement"), pursuant to which the Company shall, by October 25, 2025, file with the SEC the Initial Registration Statement covering the maximum number of (i) shares of Commitment Stock, (ii) shares of Put Stock, which have been, or which may, from time to time be issued, including without limitation all of the shares of Class A common stock which have been issued or will be issued to the Investor under the Equity Purchase Agreement (without regard to any limitation or restriction on purchases), and (iii) any and all shares of capital stock issued or issuable with respect to the Put Stock, Commitment Stock, and the Equity Purchase Agreement as a result of any stock split, combination, stock dividend, recapitalization, exchange, or similar event, or otherwise, without regard to any limitation on purchases under the Equity Purchase Agreement (the "Registrable Securities"), as shall be permitted to be included thereon in accordance with applicable SEC rules, regulations, and interpretations so as to permit the resale of the Registrable Securities by the Investor, including, but not limited to, under Rule 415 at then-prevailing market prices (and not fixed prices). The Initial Registration Statement shall register only Registrable Securities. The Company shall use its commercial best efforts to have the Initial Registration Statement and any amendment thereto declared effective by the SEC at the earliest possible date, but in no event later than November 24, 2025.

#### Nasdaq Stockholder Approval Requirement
Listing Rule 5635(d) requires stockholder approval in connection with a transaction, other than a public offering, involving the sale or issuance by the issuer of common stock (or securities convertible into or exchangeable for common stock) equal to 20% or more of the common stock or 20% or more of the voting

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power of such company outstanding before the issuance for a price that is less than the lower of: (i) the closing price of the common stock immediately preceding the signing of the binding agreement for the issuance of such securities and (ii) the average closing price of the common stock for the five (5) trading days immediately preceding the signing of the binding agreement for the issuance of such securities.

Pursuant to the Equity Purchase Agreement, in no event may we issue or sell to the Investor shares of our Class A common stock in excess of the Exchange Cap, unless (i) we obtain stockholder approval to issue shares of Class A common stock in excess of the Exchange Cap or (ii) the average price per share of all applicable sales of our Class A common stock to the Investor under the Equity Purchase Agreement equals or exceeds the Minimum Price (which represents the lower of (a) the official closing price of our Class A common stock on Nasdaq immediately preceding the execution of the Equity Purchase Agreement and (b) the average official closing price of our Class A common stock on Nasdaq for the five consecutive trading days immediately preceding the execution of the Equity Purchase Agreement, so that the Exchange Cap limitation will not apply to issuances and sales of Class A common stock pursuant to the Equity Purchase Agreement.

In any event, the Equity Purchase Agreement specifically provides that we may not issue or sell any shares of our Class A common stock under the agreement if such issuance or sale would breach any applicable Nasdaq rules. In order to fully utilize the $50,000,000 maximum aggregate purchase price available under the Equity Purchase Agreement, we are required to obtain stockholder approval pursuant to Nasdaq Listing Rule 5635(d) to permit issuances of our Class A common stock (including the issuance of more than 19.99% of our Class A common stock) to the Investor pursuant to the Equity Purchase Agreement. Based on the Minimum Price, we will need to issue a number of shares that exceeds the Exchange Cap to fully utilize the maximum aggregate purchase price available under the Equity Purchase Agreement.

Accordingly, we are seeking stockholder approval for the issuance of shares of our Class A common stock under the Equity Purchase Agreement in excess of the Exchange Cap, including the issuance of up to 750,000 shares of Class A common stock underlying the Pre-Funded Warrants, as required by Nasdaq Listing Rule 5635(d).

#### Potential Effects of Approval of this Proposal
If our stockholders approve this Proposal, we will be able to eliminate the Exchange Cap in the Equity Purchase Agreement and therefore have the option to issue shares of Put Stock up to the Maximum Commitment Amount and the Commitment Shares under the Equity Purchase Agreement, which would exceed 19.99% of our issued and outstanding shares of Class A common stock as of the date we executed the Equity Purchase Agreement. This will allow the Company to continue to execute upon our current business plan.

If stockholders approve this Proposal, the rights or privileges of our existing stockholders will not be affected, except that the economic and voting interests of each of our existing stockholders will be significantly diluted should we choose to require the Investor to purchase shares of Put Stock equal to the Maximum Commitment Amount. Although the number of shares of our Class A common stock that our existing stockholders own will not decrease, the shares of our Class A common stock owned by our existing stockholders may represent a smaller percentage of our total outstanding shares of our Class A common stock after any such issuance. Should stockholder approval be received and we sell Put Stock up to the Maximum Commitment Amount, we may sell up to 29,239,766 shares of Class A common stock, calculated by using the closing price of our shares of Class A common stock on October 14, 2025 of $1.71 per share. The issuance of shares of Class A common stock or other securities of the Company in connection with the ELOC could have an anti-takeover effect. Such issuance could dilute the voting power of a person seeking control of the Company, thereby deterring or rendering more difficult a merger, tender offer, proxy contest, election of members to the Board or an extraordinary corporate transaction opposed by the Company.

#### Consequences of Not Approving this Proposal
We are not seeking the approval of our stockholders to authorize our entry into the Equity Purchase Agreement and any related documents, as we have already done so and such documents are already binding obligations of the Company. The failure of the Company's stockholders to approve this Proposal will

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not negate the existing terms of the documents, which will remain binding obligations of the Company. In particular, the Company has already issued the Pre-Funded Warrants to the Investor as consideration for its commitment to purchase shares of Class A common stock under the Equity Purchase Agreement.

If our stockholders do not approve this Proposal, we will be unable to issue any shares pursuant to the Equity Purchase Agreement in excess of the Exchange Cap, unless the average price per share of all applicable sales of our Class A common stock to the Investor under the Equity Purchase Agreement equals or exceeds the Minimum Price, and we may be limited in the amount of money we can draw down on the ELOC under the Equity Purchase Agreement. The failure of our stockholders to approve this Proposal, (i) may result in our inability to take full advantage of the ELOC, and (ii) may require the Company to seek alternative sources of financing which may not be available on advantageous terms, or at all, and which may result in the occurrence of additional transaction expenses. Accordingly, if the Company is limited in the number of shares it can issue under the ELOC, dilution to stockholders will be limited and have the effect of limiting the Company's growth potential and ability to maintain its listing on the Nasdaq Capital Market with no additional capital under the ELOC.

Our ability to successfully implement our business plans and ultimately generate value for our stockholders is dependent upon our ability to raise capital and satisfy our ongoing business needs. If we are unable to issue shares pursuant to the Equity Purchase Agreement in excess of the Exchange Cap, we may be unable to fully satisfy our ongoing business needs on the terms or timeline we anticipate, if at all, the effect of which could materially and adversely impact future operating results, and result in a delay in or modification or abandonment of our business plans.

#### Vote Required
Assuming a quorum is present, the affirmative vote of a majority of the total votes cast on this proposal is required for approval of this Equity Line of Credit Proposal. For purposes of the approval of this Equity Line of Credit Proposal, abstentions and broker non-votes will have no effect on the result of the vote.

#### THE BOARD UNANIMOUSLY RECOMMENDS THAT <br>

#### YOU VOTE "FOR" THE EQUITY LINE OF CREDIT PROPOSAL.
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#### PROPOSAL NO. 3<br>

#### &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>

#### INDUCEMENT WARRANT PROPOSAL

#### General
Momentus is asking stockholders to approve, for purposes of complying with Nasdaq Listing Rule 5635(d), the potential issuance of up to 7,469,607 shares of Class A common stock upon the exercise of the Inducement Warrants issued by the Company pursuant to the Inducement Agreement (such shares of Class A common stock issuable upon exercise thereof, the "Inducement Warrant Shares"), and any future adjustments of the exercise price of the warrants. The key terms of the Inducement Agreement and the Inducement Warrants relating to this Inducement Warrant Proposal are as summarized below and as described in the Current Report on Form 8-K filed by the Company with the SEC on October 15, 2025 (the "Inducement Form 8-K").

The information set forth in this proposal is further qualified in its entirety by reference to the full text of the forms of the Inducement Warrant and Warrant Inducement Agreement, each attached as Exhibits 4.1 and 10.1, respectively, to the Inducement Form 8-K. Stockholders are urged to carefully read these documents.

#### Description of the Inducement Agreement and Inducement Warrants
On October 14, 2025, we entered into a warrant inducement agreement (the "Inducement Agreement") with an existing holder (the "Warrant Investor") of certain existing warrants to purchase shares of Class A common stock. Pursuant to the Inducement Agreement, the Warrant Investor agreed to, among other things, exercise for cash all of (i) its warrants issued on March 21, 2025 (the "March Warrants") to purchase 2,142,858 shares of Class A common stock at an exercise price of $1.43 per share, which was the closing price of the Class A common stock on the Nasdaq Capital Market on October 13, 2025 and (ii) its warrants issued on July 1, 2025 (the "July Warrants" and, together with the March Warrants, the "Existing Warrants") to purchase 2,836,880 shares of Class A common stock at an exercise price of $1.41 per share, for an aggregate of 4,979,738 shares of Class A common stock. In consideration for exercising the Existing Warrants, we agreed to issue to the Warrant Investor the Inducement Warrants to purchase up to 7,469,607 shares of Class A common stock (the "Inducement Warrant Shares").

Under the Inducement Agreement, we are obligated to seek stockholder approval for the exercise of the Inducement Warrants at either an annual or special meeting of stockholders to be held on or prior to December 13, 2025.

The Inducement Warrants, which were issued pursuant to the Inducement Agreement, will become exercisable upon the date we receive approval of our stockholders (the "Stockholder Approval Date") in accordance with the applicable rules and regulations of Nasdaq, and may be exercised following such date through the five (5) year anniversary of the Stockholder Approval Date, at an exercise price of $1.43 per share of Class A common stock (the "Exercise Price").

Upon obtaining stockholder approval, the Inducement Warrants will become immediately exercisable. The Exercise Price is subject to appropriate adjustment in the event of certain stock dividends and distributions, stock splits, stock combinations, reclassifications or similar events affecting the Class A common stock. Subject to limited exceptions, the holder of the Inducement Warrants will not have the right to exercise any portion of its Inducement Warrants if the holder (together with such holder's affiliates, and any persons acting as a group together with the holder or any of the holder's affiliates) would beneficially own a number of shares of Class A common stock in excess of 4.99% of the shares of Class A common stock then outstanding. At the holder's option, upon notice to the Company, the holder may increase or decrease this beneficial ownership limitation not to exceed 9.99% of the shares of Class A common stock then outstanding, with any such increase becoming effective upon 61 days' prior notice to the Company.

In addition, the Company is obligated to file a registration statement on Form S-1 no later than thirty (30) calendar days following the date of the Inducement Agreement providing for the resale of the Inducement Warrant Shares and to use commercially reasonable efforts to cause such registration statement to become effective as soon as practicable. The Company also agreed, subject to certain exceptions, not to issue any

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shares of Class A common stock or common stock equivalents until thirty (30) days following the date of the Inducement Agreement or enter into or effect Variable Rate Transaction (as defined in the Inducement Agreement) until ninety (90) days following the date of the Inducement Agreement.

The Inducement Warrants, and the Inducement Warrant Shares underlying the Inducement Warrants, were issued pursuant to an exemption from the registration requirements of the Securities Act of 1933, as amended, contained in Section 4(a)(2) thereof.

#### Why We Need Stockholder Approval
Our Board of Directors has determined that the Inducement Warrants, and the Company's ability to issue Class A common stock upon exercise of the Inducement Warrants, are in the best interests of the Company and its stockholders because the exercise of the Existing Warrants in connection with the sale of the Inducement Warrants provided the Company with significant capital. Accordingly, we are seeking stockholder approval of this proposal in order to comply with the terms of the Inducement Agreement and Nasdaq Rule 5635(d), to the extent applicable.

Nasdaq Listing Rule 5635(d) requires stockholder approval in connection with a transaction, other than a public offering, involving the sale or issuance by the issuer of common stock (or securities convertible into or exchangeable for common stock) equal to 20% or more of the common stock or 20% or more of the voting power of such company outstanding before the issuance for a price that is less than the lower of: (i) the closing price of the common stock immediately preceding the signing of the binding agreement for the issuance of such securities and (ii) the average closing price of the common stock for the five (5) trading days immediately preceding the signing of the binding agreement for the issuance of such securities.

Accordingly, to satisfy Nasdaq Listing Rule 5635(d), we are seeking stockholder approval for the potential issuance of the 7,469,607 Inducement Warrant Shares. Further, under the Inducement Warrants, we are obligated to seek stockholder approval for the exercise of the Inducement Warrants at either an annual or special meeting of stockholders to be held on or prior to December 13, 2025.

#### Potential Effects of Approval of this Proposal
If approved, this Proposal would allow the holder of the Inducement Warrants to acquire up to 7,469,607 Inducement Warrant Shares, subject to applicable beneficial ownership limitations. The number of Inducement Warrant Shares issuable under the Inducement Warrants is subject to adjustment in proportion to a stock split or reverse stock split. Once issued, each Inducement Warrant Share would have the same rights and privileges as each currently outstanding share of Class A common stock. The issuance of the Inducement Warrants or the Inducement Warrant Shares will not affect the rights of the holders of outstanding shares of Class A common stock, but any issuance of the Inducement Warrant Shares will have a dilutive effect on holders of our Class A common stock or securities convertible into Class A common stock, including the voting power, liquidation value, book value and economic rights of existing stockholders, and may result in a decline in the Company's stock price or greater price volatility. In addition, upon issuance of the Inducement Warrant Shares, there would be a greater number of shares of our Class A common stock eligible for sale in the public markets. Any such sales, or the anticipation of the possibility of such sales, represents an overhang on the market and could depress the market price of our Class A common stock.

If this proposal is approved and the Inducement Warrants are exercised for cash, we will receive proceeds of up to an additional approximately $10.7 million, before giving effect to any beneficial ownership limitations contained in the Inducement Warrants, and any future adjustments of the exercise price of the warrants, which may have the effect of limiting the Inducement Warrants holder's ability to exercise the Inducement Warrants in full, or at all. Any proceeds that we may receive upon exercise(s) of the Inducement Warrants would allow us to continue to execute upon our current business plan.

#### Potential Effects of Non-Approval of this Proposal
We are not seeking the approval of our stockholders to authorize the Company's entry into the transactions described above, as the Company has already done so and such documents are already binding obligations of the Company. The failure of stockholders to approve this proposal will not negate the existing terms of the transactions or the relevant documents, which will remain binding on the Company.

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If the Company does not obtain stockholder approval at the Special Meeting, the Company is required pursuant to the terms of the Inducement Warrants to hold a subsequent annual or special meeting every thirty (30) days thereafter to seek stockholder approval until the date stockholder approval is obtained. If the stockholders do not approve this proposal at the Special Meeting, the Company will not be able to issue shares of Class A common stock to the Warrant Investor upon the receipt of a notice of exercise of the Inducement Warrants, thereby requiring the Company to hold another meeting seeking stockholder approval at further expense to the Company. The Company's ability to successfully implement its business plans and continue as a going concern is dependent on its ability to maximize capital raising opportunities, including exercises of its outstanding warrants, like the Inducement Warrants. Accordingly, if stockholder approval of this proposal is not obtained, the Company may need to seek alternative sources of financing, which financing may not be available on advantageous terms, or at all, and which may result in the incurrence of additional transaction expenses.

#### Vote Required
Assuming a quorum is present, the affirmative vote of a majority of the total votes cast on this Proposal is required for approval of this Inducement Warrant Proposal. For purposes of the approval of this Inducement Warrant Proposal, abstentions and broker non-votes will have no effect on the result of the vote.

#### THE BOARD RECOMMENDS THAT YOU VOTE "FOR" THE INDUCEMENT WARRANT PROPOSAL.
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#### PROPOSAL NO. 4 <br>

#### &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <br>

#### ADJOURNMENT PROPOSAL
The Company is asking its stockholders to approve the postponement or adjournment of the Special Meeting to a later date or dates, if necessary or appropriate, to permit further solicitation and vote of proxies if there are insufficient votes to approve the Convertible Notes and Warrants Proposal, the Equity Line of Credit Proposal, or the Inducement Warrant Proposal at the time of the Special Meeting.

#### Vote Required
The affirmative vote of a majority of the voting power of the shares of our Class A common stock present in person or represented by proxy at the Special Meeting is required to approve the Adjournment Proposal. Abstentions have the same effect as a vote "Against" the Adjournment Proposal.

#### THE BOARD RECOMMENDS THAT YOU VOTE "FOR" THE ADJOURNMENT PROPOSAL.
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#### OTHER BUSINESS THAT MAY COME BEFORE THE SPECIAL MEETING
Our Board is not aware of any matter to be presented for action at the Special Meeting other than the matters referred to above and does not intend to bring any other matters before the Special Meeting.

#### FORWARD-LOOKING STATEMENTS
Please note that this Proxy Statement and the accompanying materials contain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Forward-looking statements include statements regarding future events and the Company's future results of operations, financial position, business strategy and future plans. Forward-looking statements are not guarantees of future performance, and you are cautioned not to place undue reliance on such statements. In some cases, you can identify forward looking statements because they contain words such as "may," "will," "should," "expects," "plans," "anticipates," "going to," "can," "could," "should," "would," "intends," "target," "projects," "contemplates," "believes," "estimates," "predicts," "potential," "outlook," "forecast," "guidance," "objective," "plan," "seek," "grow," "target," "if," "continue," or the negative of these words or other similar terms or expressions that concern the Company's expectations, strategy, priorities, plans or intentions. These statements are subject to known and unknown risks, uncertainties and other factors that may cause the Company's actual results, levels of activity, performance or achievements to differ materially from results expressed or implied in this Proxy Statement and the accompanying materials. Additional information concerning these and other risk factors is contained in the Company's latest Annual Report on Form 10-K filed with the Securities and Exchange Commission (the "SEC") on April 1, 2025, as amended on April 9, 2025, including the Risk Factors section therein, and in its other filings with the SEC. The forward-looking statements included in this Proxy Statement and the accompanying materials are made as of the date hereof. Except as required by law, the Company undertakes no obligation to update any of these forward-looking statements after the date of this Proxy Statement or to conform these statements to actual results or revised expectations.

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#### SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT
The following table sets forth certain information known to us regarding the beneficial ownership of our Class A common stock as of October 10, 2025, for each of our named executive officers for 2024, directors, all executive officers and directors as a group and each person known by us to be the beneficial owner of more than 5% of our Class A common stock. Beneficial ownership is determined according to the rules of the SEC, which generally provide that a person has beneficial ownership of a security if he, she, or it possesses sole or shared voting or investment power over that security. Under those rules, beneficial ownership includes securities that the individual or entity has the right to acquire, such as through the exercise of warrants or stock options or the vesting of restricted stock units, within 60 days of October 10, 2025. Class A common stock subject to warrants or options that are currently exercisable or exercisable within 60 days of October 10, 2025 or subject to restricted stock units that vest within 60 days of October 10, 2025 are considered outstanding and beneficially owned by the person holding such warrants, options or restricted stock units for the purpose of computing the percentage ownership of that person but are not treated as outstanding for the purpose of computing the percentage ownership of any other person. Except as noted by footnote, and subject to community property laws where applicable, based on the information provided to us, we believe that the persons and entities named in the table below have sole voting and investment power with respect to all shares shown as beneficially owned by them. Unless otherwise noted, the business address of each of our directors and executive officers is c/o Momentus Inc., 3901 N. First Street, San Jose, California 95134. The percentage of beneficial ownership of our shares of Class A common stock is calculated based on 14,583,946 shares of Class A common stock outstanding as of October 10, 2025.

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| | |
|:---|:---|
| **Name and Address of Beneficial Owners** | **Number of** <br>**Shares**<br>**%<sup>(1)</sup>**  |
| ***5% Stockholders:***<br>|  |
| ***Directors and Executive Officers:***<br>|  |
| John C. Rood | &nbsp;&nbsp;&nbsp;&nbsp;2212<sup>(2)</sup><br> &nbsp;&nbsp;\*  |
| Chris Hadfield | &nbsp;&nbsp;17317<br> &nbsp;&nbsp;\*  |
| Brian Kabot | &nbsp;&nbsp;22698<sup>(3)</sup><br> &nbsp;&nbsp;\*  |
| Mitchel B. Kugler | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;—<br> &nbsp;&nbsp;\*  |
| Victorino G. Mercado | &nbsp;&nbsp;20777<br> &nbsp;&nbsp;\*  |
| Kimberly A. Reed | &nbsp;&nbsp;21441<br> &nbsp;&nbsp;\*  |
| Linda J. Reiners | &nbsp;&nbsp;21441<br> &nbsp;&nbsp;\*  |
| &nbsp;&nbsp;Rob Schwarz | &nbsp;&nbsp;&nbsp;&nbsp;1005<sup>(4)</sup><br> &nbsp;&nbsp;\*  |
| Lon Ensler | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;—<br> &nbsp;&nbsp;\*  |
| &nbsp;&nbsp;Jon Layman | &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;—<br> &nbsp;&nbsp;\*  |
| **Directors and executive officers as a group (10 individuals)** | 107446<br> &nbsp;&nbsp;\* |

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\* Less than one percent. 

(1) The aggregate percentage of shares of Class A common stock reported to be beneficially owned by each person on October 10, 2025. 

(2)<br> Consists of (i) 2,212 shares of Class A common stock and (ii) 555 shares of Class A common stock issuable upon the exercise of options.

(3) Represents 22,698 shares of Class A common stock held by Brian Kabot directly. The Schedule 13D/A filed with the SEC by SRC-NI Holdings, LLC, the sponsor entity of Stable Road Acquisition Corp. (the "Sponsor"), on February 11, 2022 (the "Sponsor Schedule 13D/A"), indicated that Mr. Kabot, Juan Manuel Quiroga, and Edward K. Freedman are the three managing members of the Sponsor, the majority approval of whom is required to approve an action of the Sponsor. As a result, none of the aforementioned individuals are deemed to be beneficial owners of the Sponsor's securities, which, based on the Sponsor Schedule 13D/A, total 2,054 shares of Class A common stock in sole voting power and sole investment power. The Sponsor Schedule 13D/A specifies that the Sponsor is not a member of a group. 

(4)<br> Consists of (i) 331 shares of Class A common stock and (ii) 674 shares of Class A common stock issuable upon the exercise of options.

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#### STOCKHOLDER PROPOSALS
For any proposal to be considered for inclusion in our Proxy Statement for submission to the stockholders at the Company's next annual meeting of stockholders, it must be submitted in writing and comply with the requirements of Rule 14a-8 of the Exchange Act and our Amended and Restated Bylaws, as amended.

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#### PROXY AUTHORIZATION
The interest and cooperation of all stockholders in the affairs of Momentus are considered to be of the greatest importance by our management team. Whether or not you plan to attend the Special Meeting, it is requested that, whether your share holdings are large or small, you promptly authorize a proxy to vote your shares via the Internet, by telephone or by mail.

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| | |
|:---|:---|
| By Order of the Board of Directors,  | By Order of the Board of Directors,  |
|  | **John Rood**  |
|  | *Chairperson, President, and Chief Executive Officer*  |
|  | Momentus Inc. |

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