Boudreaux Chad N.

SEC source: 0001808160-26-000016 · wk-form4_1789416732.xml · derivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,594.871

Underlying: Common Stock · 17.651 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

F2 · shares: The amount acquired represents dividend equivalent rights on the RSRs, which are credited following payment of the Company's quarterly cash dividend. Pursuant to the LTISP, the number of dividend equivalent rights acquired is calculated by dividing the aggregate amount of the dividend paid on the total number of RSRs held by the reporting person by the closing price of a share of Company common stock on the dividend payment date.

F1 · derivative.exercise_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

F1 · derivative.expiration_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

SEC source: 0001808160-26-000013 · wk-form4_1781554858.xml · derivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,577.22

Underlying: Common Stock · 16.507 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

F2 · shares: The amount acquired represents dividend equivalent rights on the RSRs, which are credited following payment of the Company's quarterly cash dividend. Pursuant to the LTISP, the number of dividend equivalent rights acquired is calculated by dividing the aggregate amount of the dividend paid on the total number of RSRs held by the reporting person by the closing price of a share of Company common stock on the dividend payment date.

F1 · derivative.exercise_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

F1 · derivative.expiration_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

SEC source: 0001808160-26-000010 · wk-form4_1773692159.xml · derivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,560.713

Underlying: Common Stock · 11.781 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP").

F2 · shares: The amount acquired represents dividend equivalent rights on the RSRs, which are credited following payment of the Company's quarterly cash dividend. Pursuant to the LTISP, the number of dividend equivalent rights acquired is calculated by dividing the aggregate amount of the dividend paid on the total number of RSRs held by the reporting person by the closing price of a share of Company common stock on the dividend payment date.

F1 · derivative.exercise_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP").

F1 · derivative.expiration_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP").

SEC source: 0001808160-26-000008 · wk-form4_1773087215.xml · nonDerivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,360.03

F1 · price: Represents the weighted average sale price of $422.45 rounded to the nearest hundredth. The highest price at which the shares were sold was $422.80 and the lowest price at which the shares were sold was $422.09. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote in this Form 4.

SEC source: 0001808160-26-000006 · wk-form4_1772486159.xml · derivative · entry 3

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,548.932

Underlying: Common Stock · 414.933 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 Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") on 2/26/24 and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

F2 · derivative.exercise_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") on 2/26/24 and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

F2 · derivative.expiration_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") on 2/26/24 and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

SEC source: 0001808160-26-000006 · wk-form4_1772486159.xml · nonDerivative · entry 2

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,760.03

F1 · shares: Shares withheld by issuer for the payment of withholding taxes on restricted stock rights ("RSRs") that vested on 2/26/26,

SEC source: 0001808160-26-000006 · wk-form4_1772486159.xml · nonDerivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,947.165

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: 0001808160-26-000004 · wk-form4_1772227158.xml · derivative · entry 3

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,963.865

Underlying: Common Stock · 1,136 shares

Expires not disclosed

F3 · derivative.exercise_price: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") on 2/25/26 and vest ratably in three equal installments upon each of the first, second, and third anniversaries of the grant date.

F3 · derivative.exercise_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") on 2/25/26 and vest ratably in three equal installments upon each of the first, second, and third anniversaries of the grant date.

F3 · derivative.expiration_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") on 2/25/26 and vest ratably in three equal installments upon each of the first, second, and third anniversaries of the grant date.

SEC source: 0001808160-26-000004 · wk-form4_1772227158.xml · nonDerivative · entry 2

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 24,532.232

F2 · shares: Shares withheld by issuer for payment of withholding taxes on RPSRs.

SEC source: 0001808160-26-000004 · wk-form4_1772227158.xml · nonDerivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 27,450.202

F1 · shares: Shares issued upon settlement of restricted performance stock rights ("RPSRs") for the performance period that ended on 12/31/2025.

SEC source: 0001808160-26-000002 · wk-form4_1772058520.xml · derivative · entry 3

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,827.865

Underlying: Common Stock · 998.489 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 RSR represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") on 2/24/25 and vest ratably in three equal installments upon each of the first, second, and third anniversaries of the grant date.

F2 · derivative.exercise_date: Each RSR represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") on 2/24/25 and vest ratably in three equal installments upon each of the first, second, and third anniversaries of the grant date.

F2 · derivative.expiration_date: Each RSR represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") on 2/24/25 and vest ratably in three equal installments upon each of the first, second, and third anniversaries of the grant date.

SEC source: 0001808160-26-000002 · wk-form4_1772058520.xml · nonDerivative · entry 2

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,980.202

F1 · shares: Shares withheld by issuer for the payment of withholding taxes on Restricted Stock Rights ("RSRs") that vested on February 24, 2026.

SEC source: 0001808160-26-000002 · wk-form4_1772058520.xml · nonDerivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,439.815

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: 0001808160-25-000008 · wk-form4_1765833713.xml · derivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,826.354

Underlying: Common Stock · 16.084 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") and vest ratably in three equal installments upon each of the first, second, and third anniversaries of the grant date.

F2 · shares: The amount acquired represents dividend equivalent rights on the RSRs, which are credited following payment of the Company's quarterly cash dividend. Pursuant to the LTISP, the number of dividend equivalent rights acquired is calculated by dividing the aggregate amount of the dividend paid on the total number of RSRs held by the reporting person by the closing price of a share of Company common stock on the dividend payment date.

F1 · derivative.exercise_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") and vest ratably in three equal installments upon each of the first, second, and third anniversaries of the grant date.

F1 · derivative.expiration_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") and vest ratably in three equal installments upon each of the first, second, and third anniversaries of the grant date.

SEC source: 0001808160-25-000006 · wk-form4_1764359016.xml · nonDerivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 20,441.326

F1 · price: Represents the weighted average sale price of $314.17 rounded to the nearest hundredth. The highest price at which the shares were sold was $314.18 and the lowest price at which the shares were sold was $314.12. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote in this Form 4.

SEC source: 0001808160-25-000004 · wk-form4_1757967270.xml · derivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,810.27

Underlying: Common Stock · 18.633 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

F2 · shares: The amount acquired represents dividend equivalent rights on the RSRs, which are credited following payment of the Company's quarterly cash dividend. Pursuant to the LTISP, the number of dividend equivalent rights acquired is calculated by dividing the aggregate amount of the dividend paid on the total number of RSRs held by the reporting person by the closing price of a share of Company common stock on the dividend payment date.

F1 · derivative.exercise_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

F1 · derivative.expiration_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

SEC source: 0001628280-25-031590 · wk-form4_1750105952.xml · derivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,791.637

Underlying: Common Stock · 21.868 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

F2 · shares: The amount acquired represents dividend equivalent rights on the RSRs, which are credited following payment of the Company's quarterly cash dividend. Pursuant to the LTISP, the number of dividend equivalent rights acquired is calculated by dividing the aggregate amount of the dividend paid on the total number of RSRs held by the reporting person by the closing price of a share of Company common stock on the dividend payment date.

F1 · derivative.exercise_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

F1 · derivative.expiration_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

SEC source: 0001628280-25-029756 · wk-form4_1749159228.xml · derivative · entry 3

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 932.4125 shares

Expires not disclosed

F3 · derivative.exercise_price: The transaction constitutes an intra-plan transfer in the Huntington Ingalls Industries, Inc. Saving Excess Plan (the "SEP") from the HII Stock Fund to another investment option. The reporting person's interest in the HII Stock Fund is held in the form of units of interest. The SEP 's administrator calculates the number of shares of issuer common stock represented by units in the HII Stock Fund.

F3 · shares: The transaction constitutes an intra-plan transfer in the Huntington Ingalls Industries, Inc. Saving Excess Plan (the "SEP") from the HII Stock Fund to another investment option. The reporting person's interest in the HII Stock Fund is held in the form of units of interest. The SEP 's administrator calculates the number of shares of issuer common stock represented by units in the HII Stock Fund.

F3 · derivative.exercise_date: The transaction constitutes an intra-plan transfer in the Huntington Ingalls Industries, Inc. Saving Excess Plan (the "SEP") from the HII Stock Fund to another investment option. The reporting person's interest in the HII Stock Fund is held in the form of units of interest. The SEP 's administrator calculates the number of shares of issuer common stock represented by units in the HII Stock Fund.

F3 · derivative.expiration_date: The transaction constitutes an intra-plan transfer in the Huntington Ingalls Industries, Inc. Saving Excess Plan (the "SEP") from the HII Stock Fund to another investment option. The reporting person's interest in the HII Stock Fund is held in the form of units of interest. The SEP 's administrator calculates the number of shares of issuer common stock represented by units in the HII Stock Fund.

SEC source: 0001628280-25-029756 · wk-form4_1749159228.xml · nonDerivative · entry 2

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Indirect · By 401(k) plan

Disclosed balance after: 0

F2 · shares: The transaction constitutes an intra-plan transfer in the Huntington Ingalls Industries, Inc. Saving Plan (the "Plan") from the HII Stock Fund to another investment option. The reporting person's interest in the HII Stock Fund was held in the form of units of interest. The Plan's administrator calculates the number of shares of issuer common stock represented by units in the HII Stock Fund.

SEC source: 0001628280-25-029756 · wk-form4_1749159228.xml · nonDerivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 21,228.212

F1 · price: Represents the weighted average sale price of $228.9432 rounded to the nearest hundredth. The highest price at which the shares were sold was $228.950 and the lowest price at which the shares were sold was $228.869. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote in this Form 4.

SEC source: 0001628280-25-013130 · wk-form4_1742242655.xml · derivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,769.769

Underlying: Common Stock · 25.766 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

F2 · shares: The amount acquired represents dividend equivalent rights on the RSRs, which are credited following payment of the Company's quarterly cash dividend. Pursuant to the LTISP, the number of dividend equivalent rights acquired is calculated by dividing the aggregate amount of the dividend paid on the total number of RSRs held by the Reporting Person by the closing price of a share of Company common stock on the dividend payment date.

F1 · derivative.exercise_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

F1 · derivative.expiration_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

SEC source: 0001628280-25-008671 · wk-form4_1740691144.xml · derivative · entry 4

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,744.003

Underlying: Common Stock · 404.985 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 Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan on 2/26/24 and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

F2 · derivative.exercise_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan on 2/26/24 and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

F2 · derivative.expiration_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan on 2/26/24 and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

SEC source: 0001628280-25-008671 · wk-form4_1740691144.xml · nonDerivative · entry 2

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,193.212

F1 · shares: Shares withheld by the issuer for the payment of withholding taxes on restricted stock that vested on February 26, 2025.

SEC source: 0001628280-25-008671 · wk-form4_1740691144.xml · nonDerivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,375.861

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: 0001628280-25-007802 · wk-form4_1740520280.xml · derivative · entry 4

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,148.988

Underlying: Common Stock · 2,932 shares

Expires not disclosed

F3 · derivative.exercise_price: Each restricted stock rights ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan on 2/24/25 and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

F3 · shares: Each restricted stock rights ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan on 2/24/25 and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

F3 · derivative.exercise_date: Each restricted stock rights ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan on 2/24/25 and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

F3 · derivative.expiration_date: Each restricted stock rights ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan on 2/24/25 and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

SEC source: 0001628280-25-007802 · wk-form4_1740520280.xml · nonDerivative · entry 2

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,970.876

F2 · shares: Shares withheld by issuer for payment of withholding taxes on RPSRs.

SEC source: 0001628280-25-007802 · wk-form4_1740520280.xml · nonDerivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 25,929.397

F1 · shares: Shares issued upon settlement of restricted performance stock rights ("RPSRs") for the performance period that ended on 12/31/2024.

SEC source: 0001628280-24-051435 · wk-form4_1734384894.xml · derivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,216.988

Underlying: Common Stock · 8.491 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") on 2/26/24 and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

F2 · shares: The amount acquired represents dividend equivalent rights on the RSRs, which are credited following payment of the Company's quarterly cash dividend. Pursuant to the LTISP, the number of dividend equivalent rights acquired is calculated by dividing the aggregate amount of the dividend paid on the total number of RSRs held by the reporting person by the closing price of a share of Company common stock on the dividend payment date.

F1 · derivative.exercise_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") on 2/26/24 and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

F1 · derivative.expiration_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") on 2/26/24 and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

SEC source: 0001628280-24-040504 · wk-form4_1726518661.xml · derivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,208.497

Underlying: Common Stock · 5.977 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") on 2/26/24 and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

F2 · shares: The amount acquired represents dividend equivalent rights on the RSRs, which are credited following payment of the Company's quarterly cash dividend. Pursuant to the LTISP, the number of dividend equivalent rights acquired is calculated by dividing the aggregate amount of the dividend paid on the total number of RSRs held by the reporting person by the closing price of a share of Company common stock on the dividend payment date.

F1 · derivative.exercise_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") on 2/26/24 and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

F1 · derivative.expiration_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") on 2/26/24 and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

SEC source: 0000950170-24-083215 · ownership.xml · derivative · entry 4

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,202.52

Underlying: Common Stock · 6.52 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") on 2/26/24 and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

F3 · shares: The RSRs acquired represent dividend equivalent rights credited following payment of the Company's quarterly cash dividend. Pursuant to the LTISP, the number of RSRs acquired is calculated by dividing the aggregate amount of the dividend paid on the total number of RSRs held by the reporting person by the closing price of a share of Company common stock on the dividend payment date.

F1 · derivative.exercise_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") on 2/26/24 and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

F1 · derivative.expiration_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") on 2/26/24 and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

SEC source: 0000950170-24-030378 · ownership.xml · nonDerivative · entry 2

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,407.397

SEC source: 0000950170-24-030378 · ownership.xml · nonDerivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,422.995

F1 · shares: Huntington Ingalls Industries, Inc. paid a cash dividend of $1.30 per share of common stock on March 8, 2024. Pursuant to the terms of the Huntington Ingalls Industries, Inc. 2012 Long-Term Incentive Stock Plan, shares of common stock representing the dividend were deferred into a stock unit account in a transaction exempt by Rule 16b-3.

SEC source: 0000950170-24-022385 · ownership.xml · nonDerivative · entry 2

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,388.41

F2 · shares: Shares withheld by the issuer for the payment of withholding taxes on restricted stock that vested on February 26, 2024.

SEC source: 0000950170-24-022385 · ownership.xml · nonDerivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 22,852.627

F1 · shares: The Huntington Ingalls Industries, Inc. Compensation Committee determined that all performance goals had been met for these restricted stock units, and they were issued on February 26, 2024.

SEC source: 0000950170-24-083215 · ownership.xml · derivative · entry 3

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,196

Underlying: Common Stock · 1,196 shares

Expires not disclosed

F1 · derivative.exercise_price: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") on 2/26/24 and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

F1 · derivative.exercise_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") on 2/26/24 and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

F1 · derivative.expiration_date: Each Restricted Stock Right ("RSR") represents a contingent right to receive an equivalent number of shares of Company common stock, or, at the discretion of the Company's Compensation Committee, cash or a combination of cash and Company common stock. The RSRs were granted under the 2022 Long-Term Incentive Stock Plan ("LTISP") on 2/26/24 and vest ratably in three equal installments upon each of the first, second and third anniversaries of the grant date.

SEC source: 0001209191-23-048438 · doc4.xml · nonDerivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 15,209.627

F1 · price: The price shown is the weighted average price at which shares were acquired in multiple sales transactions made pursuant to a single market order. The range of prices for the transactions was $217.32 to $217.40. Upon request by SEC staff, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.

SEC source: 0001209191-23-018697 · doc4.xml · nonDerivative · entry 2

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,821.627

SEC source: 0001209191-23-018697 · doc4.xml · nonDerivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,836.627

F1 · shares: Huntington Ingalls Industries, Inc. paid a cash dividend of $1.24 per share of common stock on March 10, 2023. Pursuant to the terms of the Huntington Ingalls Industries, Inc. 2012 Long-Term Incentive Stock Plan, shares of common stock representing the dividend were deferred into a stock unit account in a transaction exempt by Rule 16b-3.

SEC source: 0001209191-23-014933 · doc4.xml · nonDerivative · entry 2

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 16,806.409

F2 · shares: Shares withheld by the issuer for the payment of withholding taxes on restricted stock that vested on February 28, 2023.

SEC source: 0001209191-23-014933 · doc4.xml · nonDerivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 19,569.409

F1 · shares: The Huntington Ingalls Industries, Inc. Compensation Committee determined that all performance goals had been met for these restricted stock units, and they were issued on February 28, 2023.

SEC source: 0001209191-22-018832 · doc4.xml · nonDerivative · entry 2

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,489.409

SEC source: 0001209191-22-018832 · doc4.xml · nonDerivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,492.409

F1 · shares: Huntington Ingalls Industries, Inc. paid a cash dividend of $1.18 per share of common stock on March 11, 2022. Pursuant to the terms of the Huntington Ingalls Industries, Inc. 2012 Long-Term Incentive Stock Plan, shares of common stock representing the dividend were deferred into a stock unit account in a transaction exempt by Rule 16b-3.

SEC source: 0001209191-22-016053 · doc4.xml · nonDerivative · entry 2

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,484.604

F2 · shares: Shares withheld by the issuer for the payment of withholding taxes on restricted stock that vested on March 1, 2022.

SEC source: 0001209191-22-016053 · doc4.xml · nonDerivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,303.604

F1 · shares: The Huntington Ingalls Industries, Inc. Compensation Committee determined that all performance goals had been met for these restricted stock units, and they were issued on March 1, 2022.

SEC source: 0001209191-21-055299 · doc4.xml · nonDerivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,436.604

SEC source: 0001209191-21-020958 · doc4.xml · nonDerivative · entry 2

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,435.604

SEC source: 0001209191-21-020958 · doc4.xml · nonDerivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,438.604

SEC source: 0001209191-21-017337 · doc4.xml · nonDerivative · entry 2

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 13,432.385

SEC source: 0001209191-21-017337 · doc4.xml · nonDerivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 14,007.385

F1 · kind: The Huntington Ingalls Industries, Inc. Compensation Committee determined that all performance goals had been met for these restricted stock units, and they were issued on March 1, 2021.

SEC source: 0001209191-21-014452 · doc4.xml · nonDerivative · entry 1

Boudreaux Chad N. · CIK 0001808160 · Ex VP & Chief Legal Officer

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 12,794.385

F1 · price: The price shown is the weighted average price at which shares were acquired in multiple sales transactions made pursuant to a single market order. The range of prices for the transactions was $187.95 to $188.00. Upon request by SEC staff, the issuer or a security holder of the issuer, the reporting person will provide full information regarding the number of shares sold at each separate price.