MNTS

SEC source: 0001781162-21-000038 · wf-form4_163762214111352.xml · nonDerivative · entry 1

Harms Dawn A. · CIK 0001837542 · Chief Revenue Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 49,649

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001781162-21-000037 · wf-form4_163762211981929.xml · derivative · entry 2

Kennedy Fred G III · CIK 0001828191 · President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 324,473

Underlying: Class A Common Stock · 133,822 shares

Expires 2024-09-20

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_date: The RSU Award will vest 29.2% of the total number of RSUs upon November 20, 2021. As to the balance of the 70.8% of the total number of RSUs, these RSUs will vest monthly on the 20th of each month,evenly split (70.8%/34) across the following 34 months, subject to Executive's continued Employment through each such vesting date.

SEC source: 0001781162-21-000037 · wf-form4_163762211981929.xml · nonDerivative · entry 1

Kennedy Fred G III · CIK 0001828191 · President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 133,822

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001781162-21-000036 · wf-form4_163762208498406.xml · derivative · entry 2

Rood John C. · CIK 0001873855 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 859,304

Underlying: Class A Common Stock · 57,286 shares

Expires 2025-08-20

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_date: The RSU Award will vest 6.25% of the total number of RSUs on November 20, 2021. 18.75% of the total number of RSUs will vest upon the first anniversary starting on August 20, 2022 and as to 25% of thetotal number of RSUs on each of the second, third and fourth anniversaries, subject to Executive's continued Employment through each such vesting date.

SEC source: 0001781162-21-000036 · wf-form4_163762208498406.xml · nonDerivative · entry 1

Rood John C. · CIK 0001873855 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 57,286

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001781162-21-000027 · wf-form4_163658189555353.xml · derivative · entry 1

Ney Paul · CIK 0001885907 · Chief Legal Officer & Corp.Sec

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 274,977

Underlying: Class A Common Stock · 274,977 shares

Expires 2025-11-20

F1 · derivative.exercise_date: The RSU Award will vest in four equal annual installments starting on November 20, 2022, subject to Executive's continued Employment through each such vesting date.

SEC source: 0001781162-21-000028 · wf-form4_163658191998289.xml · derivative · entry 1

Kim Jikun · CIK 0001488531 · Chief Financial Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 366,636

Underlying: Class A Common Stock · 366,636 shares

Expires 2024-09-20

F1 · derivative.exercise_date: The RSU Award will vest 29.2% of the total number of RSUs upon November 20, 2021. As to the balance of the 70.8% of the total number of RSUs, these RSUs will vest monthly on the 20th of each month, evenly split (70.8%/34) across the following 34 months, subject to Executive's continued Employment through each such vesting date.

SEC source: 0001781162-21-000031 · wf-form4_163658199839031.xml · derivative · entry 1

Kennedy Fred G III · CIK 0001828191 · President

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 458,295

Underlying: Class A Common Stock · 458,295 shares

Expires 2024-09-20

F1 · derivative.exercise_date: The RSU Award will vest 29.2% of the total number of RSUs upon November 20, 2021. As to the balance of the 70.8% of the total number of RSUs, these RSUs will vest monthly on the 20th of each month, evenly split (70.8%/34) across the following 34 months, subject to Executive's continued Employment through each such vesting date.

SEC source: 0001781162-21-000030 · wf-form4_163658197253007.xml · derivative · entry 1

Rood John C. · CIK 0001873855 · Director · Chief Executive Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 916,590

Underlying: Class A Common Stock · 916,590 shares

Expires 2025-08-20

F1 · derivative.exercise_date: The RSU Award will vest 6.25% of the total number of RSUs on November 20, 2021. 18.75% of the total number of RSUs will vest upon the first anniversary starting on August 20, 2022 and as to 25% of the total number of RSUs on each of the second, third and fourth anniversaries, subject to Executive's continued Employment through each such vesting date.

SEC source: 0001781162-21-000029 · wf-form4_163658195117017.xml · derivative · entry 1

Harms Dawn A. · CIK 0001837542 · Chief Revenue Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 148,946

Underlying: Class A Common Stock · 148,946 shares

Expires 2022-12-31

F1 · derivative.exercise_date: The RSU Award will vest in three equal installments on November 20, 2021, December 31, 2021, and December 31, 2022, subject to Executive's continued Employment through each such vesting date.

SEC source: 0001781162-21-000011 · wf-form4_163476488783450.xml · derivative · entry 2

Kugler Mitchel B. · CIK 0001877834 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,857

Underlying: Class A Common Stock · 17,857 shares

Expires 2022-06-01

F2 · derivative.exercise_date: The RSUs will vest in full on the earlier to occur of June 1, 2022 or the day before the 2022 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date. The Reporting Person elected to defer the settlement of the RSUs until the earlier of (i) the date that is five years from the vesting date, (ii) the Reporting Person's separation from service or (iii) a change in control of the Issuer.

SEC source: 0001781162-21-000011 · wf-form4_163476488783450.xml · derivative · entry 1

Kugler Mitchel B. · CIK 0001877834 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 33,333

Underlying: Class A Common Stock · 33,333 shares

Expires 2024-08-12

F1 · derivative.exercise_date: The RSUs will vest in three equal annual installments on the first, second and third anniversaries of August 12, 2021, subject to the Reporting Person's continued service as a member of the Board of Directors through each vesting date. The Reporting Person elected to defer the settlement of the RSUs until the earlier of (i) the date that is five years from the last vesting date, (ii) the Reporting Person's separation from service or (iii) a change in control of the Issuer.

SEC source: 0001781162-21-000014 · wf-form4_163476494042483.xml · derivative · entry 3

Kabot Brian · CIK 0001786113 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,857

Underlying: Class A Common Stock · 17,857 shares

Expires 2022-06-01

F3 · derivative.exercise_date: The RSUs will vest in full on the earlier to occur of June 1, 2022 or the day before the 2022 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

SEC source: 0001781162-21-000014 · wf-form4_163476494042483.xml · derivative · entry 2

Kabot Brian · CIK 0001786113 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 33,333

Underlying: Class A Common Stock · 33,333 shares

Expires 2024-08-12

F2 · derivative.exercise_date: The RSUs will vest in three equal annual installments on the first, second and third anniversaries of August 12, 2021, subject to the Reporting Person's continued service as a member of the Board of Directors through each vesting date.

SEC source: 0001781162-21-000013 · wf-form4_163476492298877.xml · derivative · entry 2

Hadfield Chris · CIK 0001837938 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,857

Underlying: Class A Common Stock · 17,857 shares

Expires 2022-06-01

F2 · derivative.exercise_date: The RSUs will vest in full on the earlier to occur of June 1, 2022 or the day before the 2022 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

SEC source: 0001781162-21-000013 · wf-form4_163476492298877.xml · derivative · entry 1

Hadfield Chris · CIK 0001837938 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 33,333

Underlying: Class A Common Stock · 33,333 shares

Expires 2024-08-12

F1 · derivative.exercise_date: The RSUs will vest in three equal annual installments on the first, second and third anniversaries of August 12, 2021, subject to the Reporting Person's continued service as a member of the Board of Directors through each vesting date.

SEC source: 0001781162-21-000012 · wf-form4_163476490530477.xml · derivative · entry 2

Mercado Victorino · CIK 0001873859 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,857

Underlying: Class A Common Stock · 17,857 shares

Expires 2022-06-01

F2 · derivative.exercise_date: The RSUs will vest in full on the earlier to occur of June 1, 2022 or the day before the 2022 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

SEC source: 0001781162-21-000012 · wf-form4_163476490530477.xml · derivative · entry 1

Mercado Victorino · CIK 0001873859 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 33,333

Underlying: Class A Common Stock · 33,333 shares

Expires 2024-08-12

F1 · derivative.exercise_date: The RSUs will vest in three equal annual installments on the first, second and third anniversaries of August 12, 2021, subject to the Reporting Person's continued service as a member of the Board of Directors through each vesting date.

SEC source: 0001781162-21-000010 · wf-form4_163476487082181.xml · derivative · entry 2

Reiners Linda J. · CIK 0001873933 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,857

Underlying: Class A Common Stock · 17,857 shares

Expires 2022-06-01

F2 · derivative.exercise_date: The RSUs will vest in full on the earlier to occur of June 1, 2022 or the day before the 2022 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

SEC source: 0001781162-21-000010 · wf-form4_163476487082181.xml · derivative · entry 1

Reiners Linda J. · CIK 0001873933 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 33,333

Underlying: Class A Common Stock · 33,333 shares

Expires 2024-08-12

F1 · derivative.exercise_date: The RSUs will vest in three equal annual installments on the first, second and third anniversaries of August 12, 2021, subject to the Reporting Person's continued service as a member of the Board of Directors through each vesting date.

SEC source: 0001781162-21-000009 · wf-form4_163476484912151.xml · derivative · entry 2

Reed Kimberly A. · CIK 0001873931 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 17,857

Underlying: Class A Common Stock · 17,857 shares

Expires 2022-06-01

F2 · derivative.exercise_date: The RSUs will vest in full on the earlier to occur of June 1, 2022 or the day before the 2022 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

SEC source: 0001781162-21-000009 · wf-form4_163476484912151.xml · derivative · entry 1

Reed Kimberly A. · CIK 0001873931 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 33,333

Underlying: Class A Common Stock · 33,333 shares

Expires 2024-08-12

F1 · derivative.exercise_date: The RSUs will vest in three equal annual installments on the first, second and third anniversaries of August 12, 2021, subject to the Reporting Person's continued service as a member of the Board of Directors through each vesting date.

SEC source: 0001209191-21-051731 · doc4.xml · derivative · entry 6

Prime Movers Lab Fund I LP · CIK 0001751631 · 10% owner

Momentus PML SPV 1 LP · CIK 0001780632 · 10% owner

MOMENTUS PML SPV 2 LP · CIK 0001819327 · 10% owner

Momentus PML SPV 3 LP · CIK 0001853076 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,000,000

Underlying: Class A Common Stock · 1,000,000 shares

Expires not disclosed

F4 · price: Pursuant to the Subscription Agreement, the Reporting Person received a warrant to purchase one share of Class A Common Stock of the Issuer at a price of $11.50 per share (subject to adjustment as described in the warrant agreement) for each share of Class A Common Stock of the Issuer purchased by the Reporting Person.

F4 · derivative.exercise_date: Pursuant to the Subscription Agreement, the Reporting Person received a warrant to purchase one share of Class A Common Stock of the Issuer at a price of $11.50 per share (subject to adjustment as described in the warrant agreement) for each share of Class A Common Stock of the Issuer purchased by the Reporting Person.

F4 · derivative.expiration_date: Pursuant to the Subscription Agreement, the Reporting Person received a warrant to purchase one share of Class A Common Stock of the Issuer at a price of $11.50 per share (subject to adjustment as described in the warrant agreement) for each share of Class A Common Stock of the Issuer purchased by the Reporting Person.

F2 · ownership.direct: Prime Movers Lab GP I LLC is the general partner of each of the Reporting Persons.

SEC source: 0001209191-21-051731 · doc4.xml · nonDerivative · entry 5

Prime Movers Lab Fund I LP · CIK 0001751631 · 10% owner

Momentus PML SPV 1 LP · CIK 0001780632 · 10% owner

MOMENTUS PML SPV 2 LP · CIK 0001819327 · 10% owner

Momentus PML SPV 3 LP · CIK 0001853076 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Momentus PML SPV 3 LP

Disclosed balance after: 2,526,394

F1 · price: On August 12, 2021, pursuant to that certain Agreement and Plan of Merger, dated as of October 7, 2020 (as amended, supplemented or modified from time to time, the "Merger Agreement"), by and among Stable Road Acquisition Corp., a Delaware corporation (the "Issuer"), Momentus Inc., a Delaware corporation ("Legacy Momentus"), and the other parties thereto, the Issuer completed its initial business combination (the "Business Combination"). As a result of the Business Combination, the Issuer changed its name to Momentus Inc. In connection with the Business Combination and in accordance with the Merger Agreement, an aggregate of 65,133,131 shares of Class A Common Stock of Legacy Momentus held by the Reporting Person were converted into 14,905,597 shares of Class A Common Stock of the Issuer. The issuance of the shares was approved by the Issuer's board of directors pursuant to Rule 16b-3 under the Securities Exchange Act of 1934, as amended.

F2 · ownership.nature: Prime Movers Lab GP I LLC is the general partner of each of the Reporting Persons.

SEC source: 0001209191-21-051731 · doc4.xml · nonDerivative · entry 4

Prime Movers Lab Fund I LP · CIK 0001751631 · 10% owner

Momentus PML SPV 1 LP · CIK 0001780632 · 10% owner

MOMENTUS PML SPV 2 LP · CIK 0001819327 · 10% owner

Momentus PML SPV 3 LP · CIK 0001853076 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Momentus PML SPV 2 LP

Disclosed balance after: 1,018,594

F1 · price: On August 12, 2021, pursuant to that certain Agreement and Plan of Merger, dated as of October 7, 2020 (as amended, supplemented or modified from time to time, the "Merger Agreement"), by and among Stable Road Acquisition Corp., a Delaware corporation (the "Issuer"), Momentus Inc., a Delaware corporation ("Legacy Momentus"), and the other parties thereto, the Issuer completed its initial business combination (the "Business Combination"). As a result of the Business Combination, the Issuer changed its name to Momentus Inc. In connection with the Business Combination and in accordance with the Merger Agreement, an aggregate of 65,133,131 shares of Class A Common Stock of Legacy Momentus held by the Reporting Person were converted into 14,905,597 shares of Class A Common Stock of the Issuer. The issuance of the shares was approved by the Issuer's board of directors pursuant to Rule 16b-3 under the Securities Exchange Act of 1934, as amended.

F2 · ownership.nature: Prime Movers Lab GP I LLC is the general partner of each of the Reporting Persons.

SEC source: 0001209191-21-051731 · doc4.xml · nonDerivative · entry 3

Prime Movers Lab Fund I LP · CIK 0001751631 · 10% owner

Momentus PML SPV 1 LP · CIK 0001780632 · 10% owner

MOMENTUS PML SPV 2 LP · CIK 0001819327 · 10% owner

Momentus PML SPV 3 LP · CIK 0001853076 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Momentus PML SPV 1 LP

Disclosed balance after: 6,373,200

F1 · price: On August 12, 2021, pursuant to that certain Agreement and Plan of Merger, dated as of October 7, 2020 (as amended, supplemented or modified from time to time, the "Merger Agreement"), by and among Stable Road Acquisition Corp., a Delaware corporation (the "Issuer"), Momentus Inc., a Delaware corporation ("Legacy Momentus"), and the other parties thereto, the Issuer completed its initial business combination (the "Business Combination"). As a result of the Business Combination, the Issuer changed its name to Momentus Inc. In connection with the Business Combination and in accordance with the Merger Agreement, an aggregate of 65,133,131 shares of Class A Common Stock of Legacy Momentus held by the Reporting Person were converted into 14,905,597 shares of Class A Common Stock of the Issuer. The issuance of the shares was approved by the Issuer's board of directors pursuant to Rule 16b-3 under the Securities Exchange Act of 1934, as amended.

F2 · ownership.nature: Prime Movers Lab GP I LLC is the general partner of each of the Reporting Persons.

SEC source: 0001209191-21-051731 · doc4.xml · nonDerivative · entry 2

Prime Movers Lab Fund I LP · CIK 0001751631 · 10% owner

Momentus PML SPV 1 LP · CIK 0001780632 · 10% owner

MOMENTUS PML SPV 2 LP · CIK 0001819327 · 10% owner

Momentus PML SPV 3 LP · CIK 0001853076 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,905,597

F3 · price: Pursuant to a Subscription Agreement dated as of July 16, 2021 (as amended from time to time, the "Subscription Agreement") entered into in connection with the Business Combination Agreement, the Reporting Person agreed to subscribe for and purchase, in a private placement immediately prior to the closing of the Business Combination, an aggregate of 1,000,000 shares of Class A Common Stock of the Issuer for a purchase price of $10.00 per share.

F2 · ownership.direct: Prime Movers Lab GP I LLC is the general partner of each of the Reporting Persons.

SEC source: 0001209191-21-051731 · doc4.xml · nonDerivative · entry 1

Prime Movers Lab Fund I LP · CIK 0001751631 · 10% owner

Momentus PML SPV 1 LP · CIK 0001780632 · 10% owner

MOMENTUS PML SPV 2 LP · CIK 0001819327 · 10% owner

Momentus PML SPV 3 LP · CIK 0001853076 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,905,597

F1 · price: On August 12, 2021, pursuant to that certain Agreement and Plan of Merger, dated as of October 7, 2020 (as amended, supplemented or modified from time to time, the "Merger Agreement"), by and among Stable Road Acquisition Corp., a Delaware corporation (the "Issuer"), Momentus Inc., a Delaware corporation ("Legacy Momentus"), and the other parties thereto, the Issuer completed its initial business combination (the "Business Combination"). As a result of the Business Combination, the Issuer changed its name to Momentus Inc. In connection with the Business Combination and in accordance with the Merger Agreement, an aggregate of 65,133,131 shares of Class A Common Stock of Legacy Momentus held by the Reporting Person were converted into 14,905,597 shares of Class A Common Stock of the Issuer. The issuance of the shares was approved by the Issuer's board of directors pursuant to Rule 16b-3 under the Securities Exchange Act of 1934, as amended.

F2 · ownership.direct: Prime Movers Lab GP I LLC is the general partner of each of the Reporting Persons.

SEC source: 0001213900-21-043016 · ownership.xml · derivative · entry 3

SRC-NI Holdings LLC · CIK 0001781119 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 3,886,029 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · kind: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · price: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · derivative.exercise_date: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · derivative.expiration_date: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · derivative.underlying_shares: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · balance_after: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F2 · ownership.direct: Brian Kabot, Juan Manuel Quiroga and Edward Freedman are the managers of SRC-NI Holdings LLC (the "Sponsor") and have voting and investment discretion with respect to the securities held by the Sponsor. As such, each of them may be deemed to share beneficial ownership of the securities held directly by the Sponsor. Each such person disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest they may have therein, directly or indirectly.

SEC source: 0001213900-21-043016 · ownership.xml · derivative · entry 2

SRC-NI Holdings LLC · CIK 0001781119 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,886,029

Underlying: Class A Common Stock · 250,000 shares

Expires not disclosed

F3 · derivative.exercise_price: Represents shares of Class B common stock relinquished and forfeited upon the closing of the Business Combination pursuant to a settlement agreement with the Securities and Exchange Commission.

F3 · kind: Represents shares of Class B common stock relinquished and forfeited upon the closing of the Business Combination pursuant to a settlement agreement with the Securities and Exchange Commission.

F3 · price: Represents shares of Class B common stock relinquished and forfeited upon the closing of the Business Combination pursuant to a settlement agreement with the Securities and Exchange Commission.

F1 · derivative.exercise_date: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · derivative.expiration_date: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F2 · ownership.direct: Brian Kabot, Juan Manuel Quiroga and Edward Freedman are the managers of SRC-NI Holdings LLC (the "Sponsor") and have voting and investment discretion with respect to the securities held by the Sponsor. As such, each of them may be deemed to share beneficial ownership of the securities held directly by the Sponsor. Each such person disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest they may have therein, directly or indirectly.

SEC source: 0001213900-21-043016 · ownership.xml · nonDerivative · entry 1

SRC-NI Holdings LLC · CIK 0001781119 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,381,029

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · shares: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · price: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F2 · ownership.direct: Brian Kabot, Juan Manuel Quiroga and Edward Freedman are the managers of SRC-NI Holdings LLC (the "Sponsor") and have voting and investment discretion with respect to the securities held by the Sponsor. As such, each of them may be deemed to share beneficial ownership of the securities held directly by the Sponsor. Each such person disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest they may have therein, directly or indirectly.

SEC source: 0001209191-21-051700 · doc4.xml · derivative · entry 2

Harms Dawn A. · CIK 0001837542 · Chief Revenue Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 246,855

Underlying: Class A Common Stock · 246,855 shares

Expires 2030-02-21

F3 · kind: In connection with the Business Combination, and in accordance with the Merger Agreement, an option to purchase 1,000,000 shares of Class A Common Stock of Legacy Momentus held by the Reporting Person was converted into an option to purchase 246,855 shares of Class A Common Stock of the Issuer. The issuance of the option was approved by the Issuer's board of directors pursuant to Rule 16b-3 under the Securities Exchange Act of 1934, as amended.

F3 · price: In connection with the Business Combination, and in accordance with the Merger Agreement, an option to purchase 1,000,000 shares of Class A Common Stock of Legacy Momentus held by the Reporting Person was converted into an option to purchase 246,855 shares of Class A Common Stock of the Issuer. The issuance of the option was approved by the Issuer's board of directors pursuant to Rule 16b-3 under the Securities Exchange Act of 1934, as amended.

F2 · derivative.exercise_date: The option vested and became exercisable as to 1/4th of the total number of shares on October 21, 2020, and thereafter will vest and become exercisable as to 1/48th of the total number of shares in equal monthly installments.

SEC source: 0001209191-21-051700 · doc4.xml · derivative · entry 1

Harms Dawn A. · CIK 0001837542 · Chief Revenue Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,857

Underlying: Class A Common Stock · 3,857 shares

Expires 2030-06-14

F1 · kind: On August 12, 2021, pursuant to that certain Agreement and Plan of Merger, dated as of October 7, 2020 (as amended, supplemented or modified from time to time, the "Merger Agreement"), by and among Stable Road Acquisition Corp., a Delaware corporation (the "Issuer"), Momentus Inc., a Delaware corporation ("Legacy Momentus"), and the other parties thereto, the Issuer completed its initial business combination (the "Business Combination"). As a result of the Business Combination, the Issuer changed its name to Momentus Inc. In connection with the Business Combination and in accordance with the Merger Agreement, an option to purchase 15,625 shares of Class A Common Stock of Legacy Momentus held by the Reporting Person was converted into an option to purchase 3,857 shares of Class A Common Stock of the Issuer. The issuance of the option was approved by the Issuer's board of directors pursuant to Rule 16b-3 under the Securities Exchange Act of 1934, as amended.

F1 · price: On August 12, 2021, pursuant to that certain Agreement and Plan of Merger, dated as of October 7, 2020 (as amended, supplemented or modified from time to time, the "Merger Agreement"), by and among Stable Road Acquisition Corp., a Delaware corporation (the "Issuer"), Momentus Inc., a Delaware corporation ("Legacy Momentus"), and the other parties thereto, the Issuer completed its initial business combination (the "Business Combination"). As a result of the Business Combination, the Issuer changed its name to Momentus Inc. In connection with the Business Combination and in accordance with the Merger Agreement, an option to purchase 15,625 shares of Class A Common Stock of Legacy Momentus held by the Reporting Person was converted into an option to purchase 3,857 shares of Class A Common Stock of the Issuer. The issuance of the option was approved by the Issuer's board of directors pursuant to Rule 16b-3 under the Securities Exchange Act of 1934, as amended.

F2 · derivative.exercise_date: The option vested and became exercisable as to 1/4th of the total number of shares on October 21, 2020, and thereafter will vest and become exercisable as to 1/48th of the total number of shares in equal monthly installments.

SEC source: 0001213900-21-043001 · ownership.xml · derivative · entry 3

Kabot Brian · CIK 0001786113 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 3,886,029 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · kind: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · price: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · derivative.exercise_date: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · derivative.expiration_date: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · derivative.underlying_shares: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · balance_after: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F2 · ownership.direct: Brian Kabot, Juan Manuel Quiroga and Edward Freedman are the managers of SRC-NI Holdings LLC (the "Sponsor") and have voting and investment discretion with respect to the securities held by the Sponsor. As such, each of them may be deemed to share beneficial ownership of the securities held directly by the Sponsor. The reporting person disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

SEC source: 0001213900-21-043001 · ownership.xml · derivative · entry 2

Kabot Brian · CIK 0001786113 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,886,029

Underlying: Class A Common Stock · 250,000 shares

Expires not disclosed

F3 · derivative.exercise_price: Represents shares of Class B common stock relinquished and forfeited upon the closing of the Business Combination pursuant to a settlement agreement with the Securities and Exchange Commission.

F3 · kind: Represents shares of Class B common stock relinquished and forfeited upon the closing of the Business Combination pursuant to a settlement agreement with the Securities and Exchange Commission.

F3 · price: Represents shares of Class B common stock relinquished and forfeited upon the closing of the Business Combination pursuant to a settlement agreement with the Securities and Exchange Commission.

F1 · derivative.exercise_date: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · derivative.expiration_date: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F2 · ownership.direct: Brian Kabot, Juan Manuel Quiroga and Edward Freedman are the managers of SRC-NI Holdings LLC (the "Sponsor") and have voting and investment discretion with respect to the securities held by the Sponsor. As such, each of them may be deemed to share beneficial ownership of the securities held directly by the Sponsor. The reporting person disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

SEC source: 0001213900-21-043001 · ownership.xml · nonDerivative · entry 1

Kabot Brian · CIK 0001786113 · Director · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,381,029

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · shares: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · price: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F2 · ownership.direct: Brian Kabot, Juan Manuel Quiroga and Edward Freedman are the managers of SRC-NI Holdings LLC (the "Sponsor") and have voting and investment discretion with respect to the securities held by the Sponsor. As such, each of them may be deemed to share beneficial ownership of the securities held directly by the Sponsor. The reporting person disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

SEC source: 0001213900-21-043004 · ownership.xml · derivative · entry 3

Quiroga Juan Manuel · CIK 0001786122 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 3,886,029 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · kind: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · price: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · derivative.exercise_date: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · derivative.expiration_date: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · derivative.underlying_shares: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · balance_after: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F2 · ownership.direct: Brian Kabot, Juan Manuel Quiroga and Edward Freedman are the managers of SRC-NI Holdings LLC (the "Sponsor") and have voting and investment discretion with respect to the securities held by the Sponsor. As such, each of them may be deemed to share beneficial ownership of the securities held directly by the Sponsor. The reporting person disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

SEC source: 0001213900-21-043004 · ownership.xml · derivative · entry 2

Quiroga Juan Manuel · CIK 0001786122 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 3,886,029

Underlying: Class A Common Stock · 250,000 shares

Expires not disclosed

F3 · derivative.exercise_price: Represents shares of Class B common stock relinquished and forfeited upon the closing of the Business Combination pursuant to a settlement agreement with the Securities and Exchange Commission.

F3 · kind: Represents shares of Class B common stock relinquished and forfeited upon the closing of the Business Combination pursuant to a settlement agreement with the Securities and Exchange Commission.

F3 · price: Represents shares of Class B common stock relinquished and forfeited upon the closing of the Business Combination pursuant to a settlement agreement with the Securities and Exchange Commission.

F1 · derivative.exercise_date: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · derivative.expiration_date: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F2 · ownership.direct: Brian Kabot, Juan Manuel Quiroga and Edward Freedman are the managers of SRC-NI Holdings LLC (the "Sponsor") and have voting and investment discretion with respect to the securities held by the Sponsor. As such, each of them may be deemed to share beneficial ownership of the securities held directly by the Sponsor. The reporting person disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

SEC source: 0001213900-21-043004 · ownership.xml · nonDerivative · entry 1

Quiroga Juan Manuel · CIK 0001786122 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,381,029

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · shares: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F1 · price: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A common stock.

F2 · ownership.direct: Brian Kabot, Juan Manuel Quiroga and Edward Freedman are the managers of SRC-NI Holdings LLC (the "Sponsor") and have voting and investment discretion with respect to the securities held by the Sponsor. As such, each of them may be deemed to share beneficial ownership of the securities held directly by the Sponsor. The reporting person disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

SEC source: 0001213900-21-044227 · ownership.xml · derivative · entry 6

Freedman Edward K. · CIK 0001786735 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Class A Common Stock · 176,471 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A Common Stock

F1 · kind: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A Common Stock

F1 · price: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A Common Stock

F1 · derivative.exercise_date: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A Common Stock

F1 · derivative.expiration_date: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A Common Stock

F1 · derivative.underlying_shares: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A Common Stock

F1 · balance_after: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A Common Stock

F3 · ownership.direct: Stable Road Capital LLC is the managing member (the "Managing Member") of SRAC PIPE Partners LLC. Edward Freedman is the sole member of the Managing Member. As such, the reporting person may be deemed to possess beneficial ownership of the securities held directly by SRAC PIPE Partners LLC. The reporting person disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

F3 · ownership.nature: Stable Road Capital LLC is the managing member (the "Managing Member") of SRAC PIPE Partners LLC. Edward Freedman is the sole member of the Managing Member. As such, the reporting person may be deemed to possess beneficial ownership of the securities held directly by SRAC PIPE Partners LLC. The reporting person disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

SEC source: 0001213900-21-044227 · ownership.xml · derivative · entry 5

Freedman Edward K. · CIK 0001786735 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 0

Underlying: Class A Common Stock · 3,886,029 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A Common Stock

F1 · kind: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A Common Stock

F1 · price: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A Common Stock

F1 · derivative.exercise_date: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A Common Stock

F1 · derivative.expiration_date: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A Common Stock

F1 · derivative.underlying_shares: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A Common Stock

F1 · balance_after: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A Common Stock

F2 · ownership.direct: Brian Kabot, Juan Manuel Quiroga and Edward Freedman are the managers of SRC-NI Holdings LLC (the "Sponsor") and have voting and investment discretion with respect to the securities held by the Sponsor. As such, each of them may be deemed to share beneficial ownership of the securities held directly by the Sponsor. The reporting person disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

F2 · ownership.nature: Brian Kabot, Juan Manuel Quiroga and Edward Freedman are the managers of SRC-NI Holdings LLC (the "Sponsor") and have voting and investment discretion with respect to the securities held by the Sponsor. As such, each of them may be deemed to share beneficial ownership of the securities held directly by the Sponsor. The reporting person disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

SEC source: 0001213900-21-044227 · ownership.xml · derivative · entry 4

Freedman Edward K. · CIK 0001786735 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 3,886,029

Underlying: Class A Common Stock · 250,000 shares

Expires not disclosed

F5 · derivative.exercise_price: Represents shares of Class B common stock relinquished and forfeited by the Sponsor upon the closing of the Business Combination pursuant to a settlement agreement with the Securities and Exchange Commission.

F5 · kind: Represents shares of Class B common stock relinquished and forfeited by the Sponsor upon the closing of the Business Combination pursuant to a settlement agreement with the Securities and Exchange Commission.

F5 · price: Represents shares of Class B common stock relinquished and forfeited by the Sponsor upon the closing of the Business Combination pursuant to a settlement agreement with the Securities and Exchange Commission.

F1 · derivative.exercise_date: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A Common Stock

F1 · derivative.expiration_date: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A Common Stock

F2 · ownership.direct: Brian Kabot, Juan Manuel Quiroga and Edward Freedman are the managers of SRC-NI Holdings LLC (the "Sponsor") and have voting and investment discretion with respect to the securities held by the Sponsor. As such, each of them may be deemed to share beneficial ownership of the securities held directly by the Sponsor. The reporting person disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

F2 · ownership.nature: Brian Kabot, Juan Manuel Quiroga and Edward Freedman are the managers of SRC-NI Holdings LLC (the "Sponsor") and have voting and investment discretion with respect to the securities held by the Sponsor. As such, each of them may be deemed to share beneficial ownership of the securities held directly by the Sponsor. The reporting person disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

SEC source: 0001213900-21-044227 · ownership.xml · nonDerivative · entry 3

Freedman Edward K. · CIK 0001786735 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,476,471

F4 · kind: Represents 1,000,000 shares of the Issuer's Class A Common Stock acquired pursuant to a subscription agreement by and among SRAC PIPE Partners LLC, the Issuer and Momentus; and 300,000 shares of the Issuer's Class A Common Stock acquired pursuant to a subscription agreement by and among Stable Road Capital LLC, the Issuer and Momentus

F4 · shares: Represents 1,000,000 shares of the Issuer's Class A Common Stock acquired pursuant to a subscription agreement by and among SRAC PIPE Partners LLC, the Issuer and Momentus; and 300,000 shares of the Issuer's Class A Common Stock acquired pursuant to a subscription agreement by and among Stable Road Capital LLC, the Issuer and Momentus

F3 · ownership.direct: Stable Road Capital LLC is the managing member (the "Managing Member") of SRAC PIPE Partners LLC. Edward Freedman is the sole member of the Managing Member. As such, the reporting person may be deemed to possess beneficial ownership of the securities held directly by SRAC PIPE Partners LLC. The reporting person disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

F3 · ownership.nature: Stable Road Capital LLC is the managing member (the "Managing Member") of SRAC PIPE Partners LLC. Edward Freedman is the sole member of the Managing Member. As such, the reporting person may be deemed to possess beneficial ownership of the securities held directly by SRAC PIPE Partners LLC. The reporting person disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

SEC source: 0001213900-21-044227 · ownership.xml · nonDerivative · entry 2

Freedman Edward K. · CIK 0001786735 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 176,471

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A Common Stock

F1 · shares: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A Common Stock

F1 · price: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A Common Stock

F3 · ownership.direct: Stable Road Capital LLC is the managing member (the "Managing Member") of SRAC PIPE Partners LLC. Edward Freedman is the sole member of the Managing Member. As such, the reporting person may be deemed to possess beneficial ownership of the securities held directly by SRAC PIPE Partners LLC. The reporting person disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

F3 · ownership.nature: Stable Road Capital LLC is the managing member (the "Managing Member") of SRAC PIPE Partners LLC. Edward Freedman is the sole member of the Managing Member. As such, the reporting person may be deemed to possess beneficial ownership of the securities held directly by SRAC PIPE Partners LLC. The reporting person disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

SEC source: 0001213900-21-044227 · ownership.xml · nonDerivative · entry 1

Freedman Edward K. · CIK 0001786735 · 10% owner

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 4,381,029

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · kind: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A Common Stock

F1 · shares: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A Common Stock

F1 · price: As described in the Issuer's registration statement on Form S-1 (File No. 333-233980) under the heading "Description of Securities--Founder Shares and Placement Shares," the shares of Class B common stock will automatically convert into shares of Class A common stock at the time of the Issuer's initial business combination on a one-for-one basis subject to certain adjustments and have no expiration date. On August 12, 2021, the Issuer completed its initial business combination (the "Business Combination") with Momentus Inc., a Delaware corporation ("Momentus"). In connection with the Business Combination, each share of Class B common stock automatically converted on a one-for-one basis into shares of the Issuer's Class A Common Stock

F2 · ownership.direct: Brian Kabot, Juan Manuel Quiroga and Edward Freedman are the managers of SRC-NI Holdings LLC (the "Sponsor") and have voting and investment discretion with respect to the securities held by the Sponsor. As such, each of them may be deemed to share beneficial ownership of the securities held directly by the Sponsor. The reporting person disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

F2 · ownership.nature: Brian Kabot, Juan Manuel Quiroga and Edward Freedman are the managers of SRC-NI Holdings LLC (the "Sponsor") and have voting and investment discretion with respect to the securities held by the Sponsor. As such, each of them may be deemed to share beneficial ownership of the securities held directly by the Sponsor. The reporting person disclaims any beneficial ownership of the reported securities other than to the extent of any pecuniary interest he may have therein, directly or indirectly.

SEC source: 0001062993-22-005000 · form4a.xml · derivative · entry 6

Prime Movers Lab Fund I LP · CIK 0001751631 · 10% owner

Momentus PML SPV 1 LP · CIK 0001780632 · 10% owner

MOMENTUS PML SPV 2 LP · CIK 0001819327 · 10% owner

Momentus PML SPV 3 LP · CIK 0001853076 · 10% owner

Sloss Dakin · CIK 0001875411 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 1,000,000

Underlying: Class A Common Stock · 1,000,000 shares

Expires not disclosed

F4 · price: Pursuant to the Subscription Agreement, the Reporting Person received a warrant to purchase one share of Class A Common Stock of the Issuer at a price of $11.50 per share (subject to adjustment as described in the warrant agreement) for each share of Class A Common Stock of the Issuer purchased by the Reporting Person.

F4 · derivative.exercise_date: Pursuant to the Subscription Agreement, the Reporting Person received a warrant to purchase one share of Class A Common Stock of the Issuer at a price of $11.50 per share (subject to adjustment as described in the warrant agreement) for each share of Class A Common Stock of the Issuer purchased by the Reporting Person.

F4 · derivative.expiration_date: Pursuant to the Subscription Agreement, the Reporting Person received a warrant to purchase one share of Class A Common Stock of the Issuer at a price of $11.50 per share (subject to adjustment as described in the warrant agreement) for each share of Class A Common Stock of the Issuer purchased by the Reporting Person.

F2 · ownership.direct: Prime Movers Lab GP I LLC is the general partner of each of the Reporting Persons.

SEC source: 0001062993-22-005000 · form4a.xml · nonDerivative · entry 5

Prime Movers Lab Fund I LP · CIK 0001751631 · 10% owner

Momentus PML SPV 1 LP · CIK 0001780632 · 10% owner

MOMENTUS PML SPV 2 LP · CIK 0001819327 · 10% owner

Momentus PML SPV 3 LP · CIK 0001853076 · 10% owner

Sloss Dakin · CIK 0001875411 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Momentus PML SPV 3 LP

Disclosed balance after: 2,526,394

F1 · price: On August 12, 2021, pursuant to that certain Agreement and Plan of Merger, dated as of October 7, 2020 (as amended, supplemented or modified from time to time, the "Merger Agreement"), by and among Stable Road Acquisition Corp., a Delaware corporation (the "Issuer"), Momentus Inc., a Delaware corporation ("Legacy Momentus"), and the other parties thereto, the Issuer completed its initial business combination (the "Business Combination"). As a result of the Business Combination, the Issuer changed its name to Momentus Inc. In connection with the Business Combination and in accordance with the Merger Agreement, an aggregate of 65,133,131 shares of Class A Common Stock of Legacy Momentus held by the Reporting Person were converted into 14,905,597 shares of Class A Common Stock of the Issuer. The issuance of the shares was approved by the Issuer's board of directors pursuant to Rule 16b-3 under the Securities Exchange Act of 1934, as amended.

F2 · ownership.nature: Prime Movers Lab GP I LLC is the general partner of each of the Reporting Persons.

SEC source: 0001062993-22-005000 · form4a.xml · nonDerivative · entry 4

Prime Movers Lab Fund I LP · CIK 0001751631 · 10% owner

Momentus PML SPV 1 LP · CIK 0001780632 · 10% owner

MOMENTUS PML SPV 2 LP · CIK 0001819327 · 10% owner

Momentus PML SPV 3 LP · CIK 0001853076 · 10% owner

Sloss Dakin · CIK 0001875411 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Momentus PML SPV 2 LP

Disclosed balance after: 1,018,594

F1 · price: On August 12, 2021, pursuant to that certain Agreement and Plan of Merger, dated as of October 7, 2020 (as amended, supplemented or modified from time to time, the "Merger Agreement"), by and among Stable Road Acquisition Corp., a Delaware corporation (the "Issuer"), Momentus Inc., a Delaware corporation ("Legacy Momentus"), and the other parties thereto, the Issuer completed its initial business combination (the "Business Combination"). As a result of the Business Combination, the Issuer changed its name to Momentus Inc. In connection with the Business Combination and in accordance with the Merger Agreement, an aggregate of 65,133,131 shares of Class A Common Stock of Legacy Momentus held by the Reporting Person were converted into 14,905,597 shares of Class A Common Stock of the Issuer. The issuance of the shares was approved by the Issuer's board of directors pursuant to Rule 16b-3 under the Securities Exchange Act of 1934, as amended.

F2 · ownership.nature: Prime Movers Lab GP I LLC is the general partner of each of the Reporting Persons.

SEC source: 0001062993-22-005000 · form4a.xml · nonDerivative · entry 3

Prime Movers Lab Fund I LP · CIK 0001751631 · 10% owner

Momentus PML SPV 1 LP · CIK 0001780632 · 10% owner

MOMENTUS PML SPV 2 LP · CIK 0001819327 · 10% owner

Momentus PML SPV 3 LP · CIK 0001853076 · 10% owner

Sloss Dakin · CIK 0001875411 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By Momentus PML SPV 1 LP

Disclosed balance after: 6,373,200

F1 · price: On August 12, 2021, pursuant to that certain Agreement and Plan of Merger, dated as of October 7, 2020 (as amended, supplemented or modified from time to time, the "Merger Agreement"), by and among Stable Road Acquisition Corp., a Delaware corporation (the "Issuer"), Momentus Inc., a Delaware corporation ("Legacy Momentus"), and the other parties thereto, the Issuer completed its initial business combination (the "Business Combination"). As a result of the Business Combination, the Issuer changed its name to Momentus Inc. In connection with the Business Combination and in accordance with the Merger Agreement, an aggregate of 65,133,131 shares of Class A Common Stock of Legacy Momentus held by the Reporting Person were converted into 14,905,597 shares of Class A Common Stock of the Issuer. The issuance of the shares was approved by the Issuer's board of directors pursuant to Rule 16b-3 under the Securities Exchange Act of 1934, as amended.

F2 · ownership.nature: Prime Movers Lab GP I LLC is the general partner of each of the Reporting Persons.

SEC source: 0001062993-22-005000 · form4a.xml · nonDerivative · entry 2

Prime Movers Lab Fund I LP · CIK 0001751631 · 10% owner

Momentus PML SPV 1 LP · CIK 0001780632 · 10% owner

MOMENTUS PML SPV 2 LP · CIK 0001819327 · 10% owner

Momentus PML SPV 3 LP · CIK 0001853076 · 10% owner

Sloss Dakin · CIK 0001875411 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,078,460

F3 · price: Pursuant to a Subscription Agreement dated as of July 16, 2021 (as amended from time to time, the "Subscription Agreement") entered into in connection with the Business Combination Agreement, the Reporting Person agreed to subscribe for and purchase, in a private placement immediately prior to the closing of the Business Combination, an aggregate of 1,000,000 shares of Class A Common Stock of the Issuer for a purchase price of $10.00 per share.

F6 · balance_after: The amount of securities beneficially owned following the reported transaction has been adjusted to correct for a previous clerical error.

F2 · ownership.direct: Prime Movers Lab GP I LLC is the general partner of each of the Reporting Persons.