#1C MOMENTUS Q1 2023 Business and Financial Highlights Copyright 2023. Momentus Inc. Not Export Controlled. Any use, reproduction, or distribution without the express consent of Momentus is strictly prohibited. May 11, 2023#2Disclaimer and Cautionary Note Regarding Forward-Looking Statements and Non-GAAP Financial Measures Forward-Looking Statements This presentation contains certain statements which constitute "forward-looking statements" within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Exchange Act of 1934. Forward- looking statements include, but are not limited to, statements regarding future financial results, future operations, future financial position, projected costs, objectives of management, and other statements regarding Momentus' or its management team's expectations, hopes, beliefs, intentions or strategies regarding the future, projections, forecasts or other characterizations of future events or circumstances, including any underlying assumptions, and are not guarantees of future performance. The words "may," "will," "anticipate," "believe, "expect," "continue," could," "estimate," "future," "intends," "may," "might," "plan," "possible," "potential," "aim," "strive," "predict," "project," "should," "would" and similar expressions may identify forward-looking statements, but the absence of these words does not mean that a statement is not forward-looking. Many factors could cause actual future events to differ materially from the forward-looking statements in this presentation, including but not limited to risks related to the ability of the Company to raise additional capital to finance its longer-term business plan; obtaining licenses and goverment approvals for our missions; delays or impediments in vehicle development, manufacture, test and deployment; the harsh and unpredictable environment of space in which our products operate; increased competition in our industry due in part to rapid technological development; delays or impediments in the development, manufacture and deployment of our vehicles; failure of our vehicles and components to operate as intended either due to error in design in production or through no fault of our own; launch schedule disruptions; supply chain disruptions; product delays or failures; design and engineering flaws; launch failures or other events that force us to cancel or reschedule launches; our ability to convert backlog or inbound inquiries into revenue; and investigations, claims, disputes, enforcement actions, litigation and/or other regulatory or legal proceedings. These are only some of the factors that may affect the forward-looking statements contained in this presentation. For a discussion identifying additional important factors that could cause actual results to differ materially from those anticipated in the forward-looking statements, see the Company's filings with the U.S. Securities and Exchange Commission including, but not limited to, "Management's Discussion and Analysis of Financial Condition and Results of Operations" and "Risk Factors" in the Company's Annual Report on Form 10-K for the year ended Dec. 31, 2022 and subsequent quarterly reports on Form 10-Q. The Company's filings may be accessed through the Investor Relations page of its website, investors.momentus.space, or through the website maintained by the SEC at www.sec.gov. Forward-looking statements speak only as of the date they are made. There can be no assurance that we will achieve the plans, intentions or expectations disclosed in our forward-looking statements, and you should not place undue reliance on our forward-looking statements. Moreover, it is not possible for our management to predict all risks or the extent to which any factor, or combination of factors, may cause actual results to differ materially from those contained in any forward-looking statements we may make. You should read this presentation with the understanding that our actual returns may be materially different from the plans, intentions and expectations disclosed in the forward-looking statements we make. Readers are cautioned not to put undue reliance on forward-looking statements, and, except as required by law, the Company assumes no obligation and does not intend to update or revise these forward-looking statements, whether as a result or new information, future events, or otherwise. The technology underlying our anticipated service offerings is still in the process of being developed and has not been fully tested or validated in space. Our ability to execute on our business plan is dependent on the successful development and commercialization of our technologies. Development of space technologies is extremely complex, time consuming, and expensive, and there can be no assurance that our predicted theoretical and ground-based results will translate into operational space vehicles that operate within the parameters we expect, or at all. Use of Non-GAAP Financial Measures This presentation references certain non-GAAP financial measures, including adjusted EBITDA, non-GAAP selling, general, and administrative expense and non-GAAP research and development expense. Momentus defines adjusted EBITDA as earnings before interest expense, taxes, depreciation and amortization, stock-based compensation, and certain other items Momentus believes are not indicative of its core operating performance. Momentus defines non-GAAP selling, general, and administrative expenses and research and development expenses as those respective GAAP amounts, excluding stock-based compensation and non-- recurring items not indicative of core operating performance. None of these non-GAAP financial measures is a substitute for or superior to measures of financial performance prepared in accordance with generally accepted accounting principles in the United States (GAAP) and should not be considered as an alternative to any other performance measures derived in accordance with GAAP. Momentus believes that presenting these non-GAAP financial measures provides useful supplemental information to investors about Momentus that is helpful in understanding and evaluating Its operating returns, enhancing the overall understanding of its past performance and future prospects, and allowing for greater transparency with respect to key financial metrics used by its management in financial and operational-decision making. However, there are a number of limitations related to the use of non-GAAP measures and their nearest GAAP equivalents. For example, other companies may calculate non-GAAP measures differently, or may use other measures to calculate their financial performance, and therefore any non-GAAP measures Momentus uses may not be directly comparable to similarly titled measures of other companies. Copyright 2023. Momentus Inc. Not Export Controlled. Any use, reproduction, or distribution without the express consent of Momentus is strictly prohibited. 2#3MOMENTUS John Rood, CEO Copyright 2023. Momentus Inc. Not Export Controlled. Any use, reproduction, or distribution without the express consent of Momentus is strictly prohibited. ** 3#4Advancing on our Mission Flight heritage, functional and operational core technology establishes competitive advantage. ● Growing interest from commercial and government customers expected to translate into contracts over coming months. Driving innovation to maximize our competitive edge. Veteran leadership team and energized technical workforce give us confidence in our future. Top Photo: Vigoride-3 Bottom Photo: Vigoride-5 Copyright 2023. Momentus Inc. Not Export Controlled. Any use, reproduction, or distribution without the express consent of Momentus is strictly prohibited. EXIT 306 lbs#5VIGORIDE-3 & DEPLOYER LAUNCHED MAY 2022 8 PAYLOADS DEPLOYED VIGORIDE-6 LAUNCHED APRIL 2023 FLYING NASA LLITED MISSION & COMMERCIAL CUSTOMERS VIGORIDE-5 LAUNCHED JANUARY 2023 SUCCESSFUL MET TESTING & ORBIT RAISE I HOSTED PAYLOAD I DEPLOYED PAYLOAD MOMENTUS#6Mission Highlights Vigoride-3 | May 2022 Deployed 8 customer satellites from the Vigoride-3 vehicle and a third party deployer. We have since completed operation of this spacecraft, which remains in orbit. Vigoride-5 | January 2023 Carrying a large, hosted payload for Caltech. Deployed a satellite for a customer called Qosmosys. Recently conducted successful orbit raise using MET propulsion system. Vigoride-6 | April 2023 Carrying two satellites from NASA. Also flying payloads for commercial customers and a Momentus-developed solar array technology demo. Copyright 2023. Momentus Inc. Not Export Controlled. Any use, reproduction, or distribution without the express consent of Momentus is strictly prohibited. Niggrips H#7● MET In-Space Testing Innovative, pioneering technology offers key efficiency, safety, and sustainability advantages. Competitors are using chemical propulsion or pure electric system like a Hall Thruster, which moves slowly and can take months or years to cover longer distances. The MET makes Momentus a great choice for customers. Momentus has now operated the MET successfully in space at full power across the range of durations for firing that we plan to use operationally to deliver satellites to precise, custom orbits and to provide in-space infrastructure services like hosted payloads. Top Photo: Ground Testing of MET Bottom Photo: Illustration of MET firing in space Copyright 2023. Momentus Inc. Not Export Controlled. Any use, reproduction, or distribution without the express consent of Momentus is strictly prohibited. !! VIGORIDE Begins first orbital transfer maneuver ARE MOMENTUS#8Customer Highlights Signed a services agreement with repeat customer, FOSSA Systems, to place its latest generation of satellites into low-Earth orbit. Signed another agreement to fly their picosatellite deployer. ● Signed contract with Hello Space to provide Hosted Payload Services for a deployer that will carry four pocketqube satellites. Signed contract with a soon-to-be-announced international customer. Mission will deliver the first tranche of picosats for a 100-satellite planned constellation. Signed contracts with Lunasonde and SatRev to fly a cubesat for each company on Vigoride-7 mission in October. Responded to NASA RFI with a unique and competitive offering to reboost the Hubble Space Telescope. Growth of interest in our capabilities from U.S. Government customers responsible for national security missions. Were selected for funding from the Space Development Agency for a Small Business Innovation Research Phase 2 award. Copyright 2023. Momentus Inc. Not Export Controlled. Any use, reproduction, or distribution without the express consent of Momentus is strictly prohibited. NASA DEPARTMEN STATES UNITED AD SPACE MMXIX OF THE SDA SPACE DEVELOPMENT AGENCY HELLO SPACE SYSTEM S FOSSA FORCE AIR FORCE 8#9111 Momentus Launch Schedule TRANSPORTER-9 October 2023 14 TRANSPORTER-10 January 2024 = 11 TRANSPORTER-11 June 2024 ||| TRANSPORTER-12 October 2024#10Momentus Market Opportunity Historical and Forecasted Satellite Deployments with satellite deployments ramping past 2,000/year, Deutsche Bank Research sees the in-space Transportation market "doubling to: ~$4B/year by CY25 488 $20B $15B $10B 1,282 $5B $OB 1,849 $10.5B 2019 2020 2021 2022 2023E 2024E 2025E 2026E 2027E 2028E Global satellite deployments per Bryce Tech $11.5B 2,413 US Space Force Modernization Budget & Outlays $2.3B $3.0B FY21 ~3,500 FY 22 Procurement BA $15.8B ~4,000 $3.6B FY 23 $16.8B ~5,000 $5.3B FY 24 RDT&E BA ~5,000 ~5,500 $15.7B Deutsche Bank forecast 000'9~ FY 25 $14.1B $14.4B $5.0B $5.1B $4.1B FY26 FY27 Modernization outlays Future Years Defense Program implies Space Force modernization outlays could ~double to: ~$20B/year by FY25 Copyright 2023. Momentus Inc. Not Export Controlled. Any use, reproduction, or distribution without the express consent of Momentus is strictly prohibited. Momentus Satellite De-Orbiting Market Forecast 2,303 283 2021 $15B $10B $5B $OB 397 $1.1B 561 $4.1B i 2022 2023 2024 2025 2026 2027 2028 2029 $1.4B $4.1B 747 $6.4B $6.8B NASA Space Programs Budget Forecast 984 FY22 FY21 Deep Space Exploration 1,223 $1.4B $1.5B $4.3B $7.5B FY 23 1,475 $6.8B $5.2B $5.4B $1.5B FY 24 Operations 1,752 $6.8B 2,027 FY25 $1.5B $5.6B $6.9B 2030 President's budget $5.7B— reflects steady growth for NASA space programs to: ~$14B/year by FY25 $1.6B $7.0B FY27 Momentus believes demand for life-extension and de-orbiting operations could approach 1,000/year or: ~$500M/year by CY25 FY 26 Space Technology Source: 1.) historical satellite deliveries per Bryce Technology, 2.) future satellite delivery forecast per Deutsche Bank Research, 3.) satellite de-orbiting market forecast per Momentus, 4.) US Space Force modernization budget/outlays per DoD Greenbook, 5.) NASA space programs budget per OMB.#11Staying Competitive Early mover advantage and track record of flight heritage helps build trust. Highly differentiated technology also enables us to win in areas of payload capacity and power, at low cost. Flexibility of our spacecraft's large, completely open and flexible upper deck can accommodate a broad diversity of payloads. Tape Spring Solar Array (TASSA) has potential to reduce unit manufacturing costs and lead times. Rendezvous and proximity operations or RPO is the key to expanding our services to include in-orbit maintenance and refueling of customer satellites, life- extension, and de-orbiting of satellites at the end of their useful life. Photo: TASSA Copyright 2023. Momentus Inc. Not Export Controlled. Any use, reproduction, or distribution without the express consent of Momentus is strictly prohibited.#12Vigoride-5 BANGED ENERGIZED EQUIPMENT Vigoride-6 Vigoride-3 Vigoride-6 Launch MET Ground Testing ● View from Vigoride-6 Momentus Investment Summary Growing space economy. Favorable demand outlook for the services we provide. Competitive advantages relative to other in-space transportation and infrastructure providers. Potential for margin improvement positions Momentus well for the future.#13MOMENTUS Eric Williams, CFO Copyright 2023. Momentus Inc. Not Export Controlled. Any use, reproduction, or distribution without the express consent of Momentus is strictly prohibited.#14Q1 Financial Highlights $33 million backlog as of April 30, 2023.* Non-restricted cash and cash equivalents of $39 million as of March 31, 2023. Approximately $12 million term loan debt as of December 31, 2022. Recognized $22 thousand in revenue, which included customer deposit. • Q1 loss from operations was approximately $20 million. Q1 Adjusted EBITDA was negative $16.1 million, an improvement over Q1 2022 of $0.5 million. Adjusted EBITDA excludes stock-based compensation expense, certain legal matters, and net mark-to-market gains and losses on warrant liabilities, and other adjusting items. Refer to the Appendix of this presentation for reconciliation with equivalent GAAP financials. ● ● ● ● Backlog includes signed contracts spanning across 19 companies in 13 countries. Backlog contains firm orders as well as options, which allow customers to opt-in to launches on shorter notice without requiring a separate agreement. In general, our customers have the right to cancel their contracts with the understanding that they will forfeit their deposits. If a customer cancels a contract before it is required to pay non-refundable deposits, we may not receive revenue from these orders, except for an initial deposit which is paid at the time the contract is signed. Copyright 2023. Momentus Inc. Not Export Controlled. Any use, reproduction, or distribution without the express consent of Momentus is strictly prohibited. 14#15Thank you! Copyright 2023. Momentus Inc. Not Export Controlled. Any use, reproduction, or distribution without the express consent of Momentus is strictly prohibited. 15#16MOMENTUS Appendix Copyright 2023. Momentus Inc. Not Export Controlled. Any use, reproduction, or distribution without the express consent of Momentus is strictly prohibited.#17Q1 2022 and Q1 2023 Income Statement View from Vigoride-5 Service revenue Gross profit MOMENTUS INC. CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS Operating expenses: Research and development expenses Selling, general and administrative expenses Total operating expenses Loss from operations Other income (expense): Increase in fair value of warrants Realized loss on disposal of asset Interest income Interest expense Litigation settlement, net Other income (UNAUDITED) (in thousands, except per share data) Total other expense Net loss Net loss per share, basic Net loss per share, fully diluted Weighted average shares outstanding, basic Weighted average shares outstanding, fully diluted S S Three Months Ended March 31, 2023 22 $ 22 10,119 10,270 20,389 (20,367) (112) 555 (920) 2022 9,971 14,853 24,824 (24,824) (451) (70) (1,492) 3 19 (458) (20,825) S (2,010) (26,834) (0.24) S (0.34) (0.24) S (0.34) 87,559,611 79,958,383 87,559,611 79,958,383 17#18March 31, 2023 Balance Sheet View from Vigoride-5 ASSETS Current assets: Cash and cash equivalents Restricted cash, current Insurance receivable Prepaids and other current assets Total current assets MOMENTUS INC. CONDENSED CONSOLIDATED BALANCE SHEETS (in thousands) Property, machinery and equipment, net Intangible assets, net Operating right-of-use asset Deferred offering costs Restricted cash, non-current Other non-current assets Total assets LIABILITIES AND STOCKHOLDERS' EQUITY Accounts payable Accrued expenses Loan payable, current Contract liabilities, current Operating lease liability, current Stock repurchase liability Litigation settlement contingency Other current liabilities Total current liabilities Contract liabilities, non-current Loan Payable, non-current Warrant liability Operating lease liability, non-current Other non-current liabilities Total non-current liabilities Total liabilities Commitment and Contingencies (Note 12) Stockholders' equity: Common stock, $0.00001 par value; 250,000,000 shares authorized and 94,984,332 issued and outstanding as of March 31, 2023; 250,000,000 shares authorized and 84,441,153 issued and outstanding as of December 31, 2022 Additional paid-in capital Accumulated deficit Total stockholders' equity Total liabilities and stockholders' equity $ S S $ March 31, 2023 (unaudited) 38,630 $ 879 4,000 9,524 53,033 3,844 340 6,174 418 363 4,670 68,842 S December 31, 2022 2,092 S 6,496 11,290 2,136 1,181 8,500 36 31,731 1,026 171 676 5,821 471 8,165 39,896 ] 353,897 (324,952) 28,946 68,842 $ 61,094 1,007 4,000 10,173 76,274 4,016 337 6,441 331 312 4,712 92,423 2,239 8,026 11,627 1,654 1,153 10,000 8,500 27 43,226 1,026 2,404 564 6,131 465 10,590 53,816 1 342,733 (304,127) 38,607 92,423 18#19CY 2023 Cash Flow Statement View from Vigoride-5 MOMENTUS INC. CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) (in thousands) Cash flows from operating activities: Net loss Adjustments to reconcile net loss to net cash used in operating activities: Depreciation and amortization Amortization of debt discount and issuance costs Amortization of right-of-use asset Change in fair value of warrant liability Loss on disposal of property, machinery, equipment and intangible assets Stock-based compensation expense Issuance of common stock to non-employees Changes in operating assets and liabilities: Prepaids and other current assets Other non-current assets Accounts payable Accrued expenses Accrued interest Other current liabilities Contract liabilities Lease liability Other non-current liabilities Net cash used in operating activities Cash flows from investing activities: Purchases of property, machinery and equipment Purchases of intangible assets Net cash used in investing activities Cash flows from financing activities: Proceeds from exercise of stock options Repurchase of Section 16 Officer shares for tax coverage exchange Principal payments on loan payable Payment of deferred offering costs Payment for repurchase of common shares Proceeds from issuance of common stock and related warrants Payments for issuance costs related to common stock and related warrants Net cash used in financing activities Decrease in cash, cash equivalents and restricted cash Cash, cash equivalents and restricted cash, beginning of period Cash, cash equivalents and restricted cash, end of period Supplemental disclosure of non-cash investing and financing activities Purchases of intangibles assets in accounts payable and accrued expenses at period end Deferred offering costs in accounts payable and accrued expenses at period end Stock repurchase liability fair value Supplemental disclosure of cash flow information Cash paid for income taxes Cash paid for interest Three Months Ended March 2023 2022 $ $ $ S $ S (20,825) $ 229 492 267 112 1,720 57 704 41 (211) (1,538) 39 12 481 (282) 6 (18,696) (43) (9) (52) 92 (60) (3,102) (23) (10,000) 10,000 (700) (3,793) (22,541) 62,413 39,872 S 7 $ 64 $ 69 69 $ 389 $ (26,834) 294 742 322 451 70 2,212 1,447 (2,685) 1,387 (273) 13 14 100 (328) 6 (23,062) (290) (231) (521) 48 (59) (927) (938) (24,521) 160,547 136,026 6,000 750 19#20CY 2023 GAAP to Non- GAAP Reconciliations View from Vigoride-5 Quarterly adjusted EBITDA A reconciliation of adjusted EBITDA to net loss for the three months ended March 31, 2023, March 31, 2022, and December 31, 2022, is set forth below: (in thousands) Net loss Income tax expense Interest income Interest expense Depreciation & amortization EBITDA Increase (decrease) in fair value of warrants Realized loss on disposal of assets Litigation settlement, net Three Months Ended March 31, 2023 March 31, 2022 (20,825) S (555) 920 229 (20,231) 112 514 85 110 1,219 22 232 122 1,720 (16,095) $ (26,834) $ 1,492 294 (25,048) 451 70 (3) December 31, 2022 Prepaid launch deposit impairment SEC and CFIUS legal expenses Class action litigation legal expenses Other non-recurring litigation legal expense SEC compliance costs NSA compliance costs Severance and other non-recurring expenses Stock-based compensation 2,212 3,044 Adjusted EBITDA (17,151) $ (15,550) 1 - Loss contingencies for certain severance agreements were reversed when the Company determined they would not be signed and paid 795 795 114 2,135 978 350 (24,440) (489) 1,096 259 (23,574) (1,803) 54 4,500 161 755 1,004 76 233 20#21CY 2023 GAAP to Non- GAAP Reconciliations View from Vigoride-5 A reconciliation of selling, general, and administrative expenses to non-GAAP selling, general, and administrative expenses for the three months ended March 31, 2023, March 31, 2022, and December 31, 2022, is set forth below: (in thousands) Selling, general, and administrative expenses Stock-based compensation SEC and CFIUS legal expenses Class action litigation legal expenses Other non-recurring litigation legal expense SEC compliance costs NSA compliance costs Severance and other non-recurring expenses¹ Non-GAAP selling, general, administration expenses March 31, 2023 S $ Three Months Ended March 31, 2022 December 31, 2022 10,270 $ 1,244 $ 85 110 $ 1,219 22 232 7,358 $ March 31, 2023 14,853 $ 1,839 795 795 114 2,135 978 1 - Loss contingencies for certain severance agreements were reversed when the Company determined they would not be signed and paid A reconciliation of research and development expenses to non-GAAP research and development expenses for the three months ended March 31, 2023, March 31, 2022, and December 31, 2022, is set forth below: 8,197 $ Three Months Ended March 31, 2022 10,119 $ 514 476 122 9,007 $ (in thousands) Research and development expenses Prepaid launch deposit impairment Stock-based compensation Severance and non-recurring expenses Non-GAAP Research and development expenses 1 - Loss contingencies for certain severance agreements were reversed when the Company determined they would not be signed and paid 10,929 2,534 161 755 1,004 76 233 9,971 $ 6,166 373 350 9,248 $ December 31, 2022 10,283 510 9,773 21