MNTS

SEC source: 0001837938-26-000004 · primary_doc.xml · nonDerivative · entry 1

Hadfield Chris · CIK 0001837938 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Hadfield Inc.

Disclosed balance after: 3,500

SEC source: 0001786113-26-000005 · primary_doc.xml · nonDerivative · entry 1

Kabot Brian · CIK 0001786113 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,708

SEC source: 0001786113-26-000004 · primary_doc.xml · nonDerivative · entry 2

Kabot Brian · CIK 0001786113 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,458

SEC source: 0002018153-26-000003 · primary_doc.xml · derivative · entry 2

Ensler Lon · CIK 0002018153 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,593

Underlying: Class A Common Stock · 15,107 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unite (RSU) represents a contingent right to receive one share of Momentus Inc. Class A Common Stock.

F2 · derivative.exercise_date: Represents a grant of RSUs, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

F2 · derivative.expiration_date: Represents a grant of RSUs, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

SEC source: 0002018153-26-000003 · primary_doc.xml · nonDerivative · entry 1

Ensler Lon · CIK 0002018153 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,405

SEC source: 0001873855-26-000004 · primary_doc.xml · derivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 63,299

Underlying: Class A Common Stock · 40,485 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of Momentus Inc. Class A Common Stock.

F2 · derivative.exercise_date: Represents a grant of RSUs, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

F2 · derivative.expiration_date: Represents a grant of RSUs, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

SEC source: 0001873855-26-000004 · primary_doc.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 55,474

SEC source: 0001905262-26-000003 · primary_doc.xml · derivative · entry 2

SCHWARZ ROBERT E · CIK 0001905262 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,609

Underlying: Class A Common Stock · 10,635 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of Momentus Inc. Class A Common Stock.

F2 · derivative.exercise_date: Represents a grant of RSUs, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

F2 · derivative.expiration_date: Represents a grant of RSUs, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

SEC source: 0001905262-26-000003 · primary_doc.xml · nonDerivative · entry 1

SCHWARZ ROBERT E · CIK 0001905262 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,476

SEC source: 0001857583-26-000005 · primary_doc.xml · derivative · entry 2

Layman Jon · CIK 0001857583 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,593

Underlying: Class A Common Stock · 15,107 shares

Expires not disclosed

F2 · derivative.exercise_price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of Momentus Inc. Class A Common Stock.

F3 · shares: This first amendment to the Form 4 filed by the Reporting Person on 05/21/2026 indicates a correction to the amount of derivative securities acquired.

F4 · derivative.exercise_date: Represents a grant of RSUs, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

F4 · derivative.expiration_date: Represents a grant of RSUs, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

SEC source: 0001857583-26-000005 · primary_doc.xml · nonDerivative · entry 1

Layman Jon · CIK 0001857583 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 14,270

F1 · shares: This first amendment to the Form 4 filed by the Reporting Person on 05/21/2026 indicates a correction to the amount of securities acquired.

SEC source: 0001857583-26-000004 · primary_doc.xml · derivative · entry 2

Layman Jon · CIK 0001857583 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,609

Underlying: Class A Common Stock · 10,635 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of Momentus Inc. Class A Common Stock.

F2 · derivative.exercise_date: Represents a grant of RSUs, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

F2 · derivative.expiration_date: Represents a grant of RSUs, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

SEC source: 0001857583-26-000004 · primary_doc.xml · nonDerivative · entry 1

Layman Jon · CIK 0001857583 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,476

SEC source: 0001877834-26-000002 · primary_doc.xml · derivative · entry 1

Kugler Mitchel B. · CIK 0001877834 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,039

Underlying: Class A Common Stock · 6,039 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of Momentus Inc. Class A Common Stock.

F2 · derivative.exercise_date: The RSUs will vest in full on the earlier to occur of May 18, 2027 or the day of the 2027 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

F2 · derivative.expiration_date: The RSUs will vest in full on the earlier to occur of May 18, 2027 or the day of the 2027 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

SEC source: 0001786113-26-000004 · primary_doc.xml · derivative · entry 3

Kabot Brian · CIK 0001786113 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,039

Underlying: Class A Common Stock · 6,039 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of Momentus Inc. Class A Common Stock.

F2 · derivative.exercise_date: The RSUs will vest in full on the earlier to occur of May 18, 2027 or the day of the 2027 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

F2 · derivative.expiration_date: The RSUs will vest in full on the earlier to occur of May 18, 2027 or the day of the 2027 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

SEC source: 0001786113-26-000004 · primary_doc.xml · nonDerivative · entry 1

Kabot Brian · CIK 0001786113 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,208

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: 0001873931-26-000002 · primary_doc.xml · derivative · entry 2

Reed Kimberly A. · CIK 0001873931 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,039

Underlying: Class A Common Stock · 6,039 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of Momentus Inc. Class A Common Stock.

F2 · derivative.exercise_date: The RSUs will vest in full on the earlier to occur of May 18, 2027 or the day of the 2027 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

F2 · derivative.expiration_date: The RSUs will vest in full on the earlier to occur of May 18, 2027 or the day of the 2027 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

SEC source: 0001873931-26-000002 · primary_doc.xml · nonDerivative · entry 1

Reed Kimberly A. · CIK 0001873931 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,115

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: 0001873859-26-000002 · primary_doc.xml · derivative · entry 2

Mercado Victorino · CIK 0001873859 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,039

Underlying: Class A Common Stock · 6,039 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of Momentus Inc. Class A Common Stock.

F2 · derivative.exercise_date: The RSUs will vest in full on the earlier to occur of May 18, 2027 or the day of the 2027 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

F2 · derivative.expiration_date: The RSUs will vest in full on the earlier to occur of May 18, 2027 or the day of the 2027 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

SEC source: 0001873859-26-000002 · primary_doc.xml · nonDerivative · entry 1

Mercado Victorino · CIK 0001873859 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,077

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: 0001837938-26-000003 · primary_doc.xml · derivative · entry 2

Hadfield Chris · CIK 0001837938 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,039

Underlying: Class A Common Stock · 6,039 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of Momentus Inc. Class A Common Stock.

F2 · derivative.exercise_date: The RSUs will vest in full on the earlier to occur of May 18, 2027 or the day of the 2027 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

F2 · derivative.expiration_date: The RSUs will vest in full on the earlier to occur of May 18, 2027 or the day of the 2027 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

SEC source: 0001837938-26-000003 · primary_doc.xml · nonDerivative · entry 1

Hadfield Chris · CIK 0001837938 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,884

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: 0001873933-26-000002 · primary_doc.xml · derivative · entry 2

Reiners Linda J. · CIK 0001873933 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 6,039

Underlying: Class A Common Stock · 6,039 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unite (RSU) represents a contingent right to receive one share of Momentus Inc. Class A Common Stock.

F2 · derivative.exercise_date: The RSUs will vest in full on the earlier to occur of May 18, 2027 or the day of the 2027 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

F2 · derivative.expiration_date: The RSUs will vest in full on the earlier to occur of May 18, 2027 or the day of the 2027 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

SEC source: 0001873933-26-000002 · primary_doc.xml · nonDerivative · entry 1

Reiners Linda J. · CIK 0001873933 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,115

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: 0001837938-26-000001 · primary_doc.xml · nonDerivative · entry 1

Hadfield Chris · CIK 0001837938 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · Hadfield Inc.

Disclosed balance after: 1,500

SEC source: 0001786113-26-000002 · primary_doc.xml · nonDerivative · entry 1

Kabot Brian · CIK 0001786113 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,295

F1 · price: This transaction was executed in multiple trades at prices ranging from $5.275 to $5.6099. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected.

F2 · balance_after: The reporting person was previously reported as a beneficial owner of securities held by SRC-NI Holdings, LLC. The number of shares reported in Column 5 as direct ownership is greater than previously reported due to a distribution of shares by SRC-NI Holdings, LLC to its investors.

SEC source: 0002018153-26-000001 · primary_doc.xml · derivative · entry 2

Ensler Lon · CIK 0002018153 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,486

Underlying: Class A Common Stock · 8,486 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit represents a contingent right to receive one share of Momentus Inc. Class A Common Stock.

F3 · derivative.exercise_date: Represents a grant of Restricted Stock Units, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

F3 · derivative.expiration_date: Represents a grant of Restricted Stock Units, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

SEC source: 0002018153-26-000001 · primary_doc.xml · derivative · entry 1

Ensler Lon · CIK 0002018153 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,606

Underlying: Class A Common Stock · 3,606 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit represents a contingent right to receive one share of Momentus Inc. Class A Common Stock.

F2 · derivative.exercise_date: Represents a grant of Restricted Stock Units, which vest in four equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

F2 · derivative.expiration_date: Represents a grant of Restricted Stock Units, which vest in four equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

SEC source: 0001905262-26-000001 · primary_doc.xml · derivative · entry 1

SCHWARZ ROBERT E · CIK 0001905262 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 5,974

Underlying: Class A Common Stock · 5,974 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit represents a contingent right to receive one share of Momentus Inc. Class A Common Stock.

F2 · derivative.exercise_date: Represents a grant of Restricted Stock Units, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

F2 · derivative.expiration_date: Represents a grant of Restricted Stock Units, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

SEC source: 0001857583-26-000002 · primary_doc.xml · derivative · entry 1

Layman Jon · CIK 0001857583 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 8,486

Underlying: Class A Common Stock · 8,486 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit represents a contingent right to receive one share of Momentus Inc. Class A Common Stock.

F2 · derivative.exercise_date: Represents a grant of Restricted Stock Units, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

F2 · derivative.expiration_date: Represents a grant of Restricted Stock Units, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

SEC source: 0001873855-26-000002 · primary_doc.xml · derivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,744

Underlying: Class A Common Stock · 22,744 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit represents a contingent right to receive one share of Momentus Inc. Class A Common Stock.

F2 · derivative.exercise_date: Represents a grant of Restricted Stock Units, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

F2 · derivative.expiration_date: Represents a grant of Restricted Stock Units, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

SEC source: 0001781162-25-000031 · wk-form4_1755892993.xml · derivative · entry 3

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Class A Common Stock · 327 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.

F2 · derivative.exercise_price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of Momentus, Inc. Class A Common Stock.

F3 · 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.

F3 · derivative.expiration_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: 0001781162-25-000031 · wk-form4_1755892993.xml · nonDerivative · entry 2

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,212

F1 · shares: These shares were withheld by the Issuer in order to satisfy certain tax withholding obligations in connection with the issuance of vested restricted stock units.

SEC source: 0001781162-25-000031 · wk-form4_1755892993.xml · nonDerivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,328

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: 0002018153-25-000005 · wk-form4_1757534881.xml · derivative · entry 1

Ensler Lon · CIK 0002018153 · CFO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 95,000

Underlying: Class A Common Stock · 95,000 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of Momentus, Inc. Class A Common Stock.

F2 · deemedExecutionDate: This transaction is being reported late due to an administrative error.

F3 · derivative.exercise_date: Represents a grant of Restricted Stock Units, which vest in four equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

F3 · derivative.expiration_date: Represents a grant of Restricted Stock Units, which vest in four equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

F3 · balance_after: Represents a grant of Restricted Stock Units, which vest in four equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

SEC source: 0001781162-25-000027 · wk-form4_1751578891.xml · derivative · entry 2

Kugler Mitchel B. · CIK 0001877834 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,294

Underlying: Class A Common Stock · 16,294 shares

Expires 2030-06-30

F3 · derivative.exercise_price: The Reporting Person elected to defer receipt of 16,294 shares of Class A Common Stock granted to the Reporting Person. Each share of Deferred RSUs is the economic equivalent of one share of MNTS Class A Common Stock.

F3 · price: The Reporting Person elected to defer receipt of 16,294 shares of Class A Common Stock granted to the Reporting Person. Each share of Deferred RSUs is the economic equivalent of one share of MNTS Class A Common Stock.

SEC source: 0001781162-25-000027 · wk-form4_1751578891.xml · derivative · entry 1

Kugler Mitchel B. · CIK 0001877834 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,294

Underlying: Class A Common Stock · 16,294 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of Momentus, Inc. Class A Common Stock.

F2 · derivative.exercise_date: The RSUs will vest in full on the earlier to occur of June 30, 2026 or the day before the 2026 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

F2 · derivative.expiration_date: The RSUs will vest in full on the earlier to occur of June 30, 2026 or the day before the 2026 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

SEC source: 0001781162-25-000028 · wk-form4_1751578923.xml · derivative · entry 2

Hadfield Chris · CIK 0001837938 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,294

Underlying: Class A Common Stock · 16,294 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of Momentus, Inc. Class A Common Stock.

F2 · derivative.exercise_date: The RSUs will vest in full on the earlier to occur of June 30, 2026 or the day before the 2026 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

F2 · derivative.expiration_date: The RSUs will vest in full on the earlier to occur of June 30, 2026 or the day before the 2026 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

SEC source: 0001781162-25-000028 · wk-form4_1751578923.xml · nonDerivative · entry 1

Hadfield Chris · CIK 0001837938 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,317

SEC source: 0001781162-25-000026 · wk-form4_1751578846.xml · derivative · entry 2

Mercado Victorino · CIK 0001873859 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,294

Underlying: Class A Common Stock · 16,294 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of Momentus, Inc. Class A Common Stock.

F2 · derivative.exercise_date: The RSUs will vest in full on the earlier to occur of June 30, 2026 or the day before the 2026 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

F2 · derivative.expiration_date: The RSUs will vest in full on the earlier to occur of June 30, 2026 or the day before the 2026 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

SEC source: 0001781162-25-000026 · wk-form4_1751578846.xml · nonDerivative · entry 1

Mercado Victorino · CIK 0001873859 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,777

SEC source: 0001781162-25-000024 · wk-form4_1751578736.xml · derivative · entry 2

Reiners Linda J. · CIK 0001873933 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,294

Underlying: Class A Common Stock · 16,294 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of Momentus, Inc. Class A Common Stock.

F2 · derivative.exercise_date: The RSUs will vest in full on the earlier to occur of June 30, 2026 or the day before the 2026 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

F2 · derivative.expiration_date: The RSUs will vest in full on the earlier to occur of June 30, 2026 or the day before the 2026 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

SEC source: 0001781162-25-000024 · wk-form4_1751578736.xml · nonDerivative · entry 1

Reiners Linda J. · CIK 0001873933 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,441

SEC source: 0001781162-25-000025 · wk-form4_1751578793.xml · derivative · entry 2

Reed Kimberly A. · CIK 0001873931 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,294

Underlying: Class A Common Stock · 16,294 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of Momentus, Inc. Class A Common Stock.

F2 · derivative.exercise_date: The RSUs will vest in full on the earlier to occur of June 30, 2026 or the day before the 2026 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

F2 · derivative.expiration_date: The RSUs will vest in full on the earlier to occur of June 30, 2026 or the day before the 2026 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

SEC source: 0001781162-25-000025 · wk-form4_1751578793.xml · nonDerivative · entry 1

Reed Kimberly A. · CIK 0001873931 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,441

SEC source: 0001781162-25-000023 · wk-form4_1751578692.xml · derivative · entry 3

Kabot Brian · CIK 0001786113 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,294

Underlying: Class A Common Stock · 16,294 shares

Expires not disclosed

F2 · derivative.exercise_price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of Momentus, Inc. Class A Common Stock.

F3 · derivative.exercise_date: The RSUs will vest in full on the earlier to occur of June 30, 2026 or the day before the 2026 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

F3 · derivative.expiration_date: The RSUs will vest in full on the earlier to occur of June 30, 2026 or the day before the 2026 Annual Meeting, subject to the Reporting Person's continued service as a member of the Board of Directors through such vesting date.

SEC source: 0001781162-25-000023 · wk-form4_1751578692.xml · nonDerivative · entry 1

Kabot Brian · CIK 0001786113 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,698

SEC source: 0001781162-25-000022 · wk-form4_1751578650.xml · derivative · entry 1

SCHWARZ ROBERT E · CIK 0001905262 · Chief Technology Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 44,809

Underlying: Class A Common Stock · 44,809 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of Momentus, Inc. Class A Common Stock.

F2 · derivative.exercise_date: Represents a grant of Restricted Stock Units, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

F2 · derivative.expiration_date: Represents a grant of Restricted Stock Units, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

SEC source: 0001781162-25-000021 · wk-form4_1751578612.xml · derivative · entry 1

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 170,580

Underlying: Class A Common Stock · 170,580 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of Momentus, Inc. Class A Common Stock.

F2 · derivative.exercise_date: Represents a grant of Restricted Stock Units, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

F2 · derivative.expiration_date: Represents a grant of Restricted Stock Units, which vest in three equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

SEC source: 0001781162-25-000019 · wk-form4_1751578504.xml · derivative · entry 1

Layman Jon · CIK 0001857583 · Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 127,298

Underlying: Class A Common Stock · 127,298 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of Momentus, Inc. Class A Common Stock.

F2 · derivative.exercise_date: Represents a grant of Restricted Stock Units, which vest in four equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.

F2 · derivative.expiration_date: Represents a grant of Restricted Stock Units, which vest in four equal annual installments from Vesting Commencement Date, subject to Executive's continued Employment through each such vesting date.