O'Sullivan Stephanie L.

SEC source: 0001842003-26-000016 · wk-form4_1790972586.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,410.489

F1 · shares: Shares of common stock deferred into stock unit account pursuant to Huntington Ingalls Industries, Inc. 2022 Long-Term Incentive Stock Plan in an exempt transaction pursuant to Rule 16b-3.

SEC source: 0001842003-26-000014 · wk-form4_1789416777.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,233.489

F1 · shares: Pursuant to the Huntington Ingalls Industries, Inc. 2012 and 2022 Long-Term Incentive Stock Plan (together, the "LTISPs"), dividend equivalents are credited on each director stock unit ("SUA") held by the Reporting Person following the payment of the Company's quarterly cash dividend. Each SUA represents a right to receive one share of Company common stock, which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors. The number of dividend equivalents acquired by the Reporting Person under the LTISPs is calculated by dividing the aggregate amount of the dividend paid on the total number of SUAs held by the Reporting Person by the closing price of a share of Company common stock on the dividend payment date.

SEC source: 0001842003-26-000012 · wk-form4_1783023377.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,212.703

F1 · shares: Shares of common stock deferred into stock unit account pursuant to Huntington Ingalls Industries, Inc. 2022 Long-Term Incentive Stock Plan in an exempt transaction pursuant to Rule 16b-3.

SEC source: 0001842003-26-000010 · wk-form4_1781554890.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,038.703

F1 · shares: Pursuant to the Huntington Ingalls Industries, Inc. 2012 and 2022 Long-Term Incentive Stock Plan (together, the "LTISPs"), dividend equivalents are credited on each director stock unit ("SUA") held by the Reporting Person following the payment of the Company's quarterly cash dividend. Each SUA represents a right to receive one share of Company common stock, which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors. The number of dividend equivalents acquired by the Reporting Person under the LTISPs is calculated by dividing the aggregate amount of the dividend paid on the total number of SUAs held by the Reporting Person by the closing price of a share of Company common stock on the dividend payment date.

SEC source: 0001842003-26-000007 · wk-form4_1775226073.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,020.065

F1 · shares: Shares of common stock deferred into stock unit account pursuant to Huntington Ingalls Industries, Inc. 2022 Long-Term Incentive Stock Plan in an exempt transaction pursuant to Rule 16b-3.

SEC source: 0001842003-26-000004 · wk-form4_1773692191.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,897.065

F1 · shares: Pursuant to the Huntington Ingalls Industries, Inc. 2012 and 2022 Long-Term Incentive Stock Plan (together, the "LTISPs"), dividend equivalents are credited on each director stock unit ("SUA") held by the Reporting Person following the payment of the Company's quarterly cash dividend. Each SUA represents a right to receive one share of Company common stock, which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors. The number of dividend equivalents acquired by the Reporting Person under the LTISPs is calculated by dividing the aggregate amount of the dividend paid on the total number of SUAs held by the Reporting Person by the closing price of a share of Company common stock on the dividend payment date.

SEC source: 0001842003-26-000002 · wk-form4_1767647798.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,884.172

F1 · shares: Shares of common stock deferred into stock unit account pursuant to Huntington Ingalls Industries, Inc. 2022 Long-Term Incentive Stock Plan in an exempt transaction pursuant to Rule 16b-3.

SEC source: 0001842003-25-000007 · wk-form4_1765833647.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,745.172

F1 · shares: Pursuant to the Huntington Ingalls Industries, Inc. 2012 and 2022 Long-Term Incentive Stock Plan (together, the "LTISPs"), dividend equivalents are credited on each director stock unit ("SUA") held by the Reporting Person following the payment of the Company's quarterly cash dividend. Each SUA represents a right to receive one share of Company common stock, which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors. The number of dividend equivalents acquired by the Reporting Person under the LTISPs is calculated by dividing the aggregate amount of the dividend paid on the total number of SUAs held by the Reporting Person by the closing price of a share of Company common stock on the dividend payment date.

SEC source: 0001842003-25-000005 · wk-form4_1759436403.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,729.429

F1 · shares: Shares of common stock deferred into stock unit account pursuant to Huntington Ingalls Industries, Inc. 2022 Long-Term Incentive Stock Plan in an exempt transaction pursuant to Rule 16b-3.

SEC source: 0001842003-25-000004 · wk-form4_1757967226.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,585.429

F1 · shares: Pursuant to the Huntington Ingalls Industries, Inc. 2012 and 2022 Long-Term Incentive Stock Plan (together, the "LTISPs"), dividend equivalents are credited on each director stock unit ("SUA") held by the Reporting Person following the payment of the Company's quarterly cash dividend. Each SUA represents a right to receive one share of Company common stock, which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors. The number of dividend equivalents acquired by the Reporting Person under the LTISPs is calculated by dividing the aggregate amount of the dividend paid on the total number of SUAs held by the Reporting Person by the closing price of a share of Company common stock on the dividend payment date.

SEC source: 0001628280-25-033990 · wk-form4_1751487626.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,567.895

F1 · shares: Shares of common stock deferred into stock unit account pursuant to Huntington Ingalls Industries, Inc. 2022 Long-Term Incentive Stock Plan in an exempt transaction pursuant to Rule 16b-3.

SEC source: 0001065059-25-000041 · wk-form4_1750801850.xml · nonDerivative · entry 2

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,672

F2 · kind: Represents the surrender of shares to the company in exchange for cash to satisfy the reporting person's tax liability with respect to the settlement of 2024 RSUs.

SEC source: 0001065059-25-000041 · wk-form4_1750801850.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,840

F1 · balance_after: Includes 3,156 Class A common stock pursuant to the Company's equity incentive plan. The newly acquired restricted stock units vest on June 18, 2026 and will be settled at that time by issuing shares.

SEC source: 0001628280-25-031571 · wk-form4_1750105019.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,400.895

F1 · shares: Pursuant to the Huntington Ingalls Industries, Inc. 2012 and 2022 Long-Term Incentive Stock Plan (together, the "LTISPs"), dividend equivalents are credited on each director stock unit ("DSU") held by the Reporting Person following the payment of the Company's quarterly cash dividend. Each DSU represents a right to receive one share of Company common stock, which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors. The number of dividend equivalents acquired by the Reporting Person under the LTISPs is calculated by dividing the aggregate amount of the dividend paid on the total number of stock units ("SUAs") held by the Reporting Person by the closing price of a share of Company common stock on the dividend payment date.

SEC source: 0001628280-25-016037 · wk-form4_1743553472.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,381.281

F1 · shares: Shares of common stock deferred into stock unit account pursuant to Huntington Ingalls Industries, Inc. 2022 Long-Term Incentive Stock Plan, in an exempt transaction pursuant to Rule 16b-3.

SEC source: 0001628280-25-013132 · wk-form4_1742242679.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,177.281

F1 · shares: Pursuant to the Huntington Ingalls Industries, Inc. 2012 and 2022 Long-Term Incentive Stock Plan (together, the "LTISPs"), dividend equivalents are credited on each director stock unit ("DSU") held by the Reporting Person following the payment of the Company's quarterly cash dividend. Each DSU represents a right to receive one share of Company common stock, which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors. The number of dividend equivalents acquired by the Reporting Person under the LTISPs is calculated by dividing the aggregate amount of the dividend paid on the total number of stock units held by the Reporting Person by the closing price of a share of Company common stock on the dividend payment date.

SEC source: 0001628280-25-000269 · wk-form4_1735939236.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,155.566

F1 · shares: Shares of common stock deferred into stock unit account pursuant to Huntington Ingalls Industries, Inc. 2022 Long-Term Incentive Stock Plan, in an exempt transaction pursuant to Rule 16b-3.

SEC source: 0001628280-24-051433 · wk-form4_1734384884.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,936.566

F1 · shares: Pursuant to the Huntington Ingalls Industries, Inc. 2012 and 2022 Long-Term Incentive Stock Plan (together, the "LTISPs"), dividend equivalents are credited on each director stock unit ("DSU") held by the Reporting Person following the payment of the Company's quarterly cash dividend. Each DSU represents a right to receive one share of Company common stock, which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors. The number of dividend equivalents acquired by the Reporting Person under the LTISPs is calculated by dividing the aggregate amount of the dividend paid on the total number of stock units ("SUAs") held by the Reporting Person by the closing price of a share of Company common stock on the dividend payment date.

SEC source: 0001628280-24-041902 · wk-form4_1727900371.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,916.077

F1 · shares: Shares of common stock deferred into stock unit account pursuant to Huntington Ingalls Industries, Inc. 2022 Long-Term Incentive Stock Plan in an exempt transaction pursuant to Rule 16b-3.

SEC source: 0001628280-24-040487 · wk-form4_1726518509.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 2,761.077

F1 · shares: Pursuant to the Huntington Ingalls Industries, Inc. 2012 and 2022 Long-Term Incentive Stock Plan (together, the "LTISPs"), dividend equivalents are credited on each director stock unit ("DSU") held by the Reporting Person following the payment of the Company's quarterly cash dividend. Each DSU represents a right to receive one share of Company common stock, which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors. The number of dividend equivalents acquired by the Reporting Person under the LTISPs is calculated by dividing the aggregate amount of the dividend paid on the total number of DSUs held by the Reporting Person by the closing price of a share of Company common stock on the dividend payment date.

SEC source: 0001065059-24-000076 · form4.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,156

F1 · balance_after: RSUs issued pursuant to the Company's equity incentive plan that will vest on June 20, 2025 and will be settled at the time by issuing shares.

SEC source: 0000950170-24-080694 · ownership.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 2,747.21

F1 · shares: Shares of common stock deferred into stock unit account pursuant to Huntington Ingalls Industries, Inc. 2022 Long-Term Incentive Stock Plan, in an exempt transaction pursuant to Rule 16b-3.

F2 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 and 2022 Long-Term Incentive Stock Plans. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0000950170-24-075182 · ownership.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 2,580.21

F1 · shares: Huntington Ingalls Industries, Inc. paid a cash dividend of $1.30 per share of common stock on June 14, 2024. Pursuant to the terms of the Huntington Ingalls Industries, Inc. 2012 and 2022 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.

F2 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 and 2022 Long-Term Incentive Stock Plans. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0000950170-24-041177 · ownership.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 2,566.22

F1 · shares: Shares of common stock deferred into stock unit account pursuant to Huntington Ingalls Industries, Inc. 2022 Long-Term Incentive Stock Plan, in an exempt transaction pursuant to Rule 16b-3.

F2 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 and 2022 Long-Term Incentive Stock Plans. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0000950170-24-030341 · ownership.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 2,423.22

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 and 2022 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.

F2 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 and 2022 Long-Term Incentive Stock Plans. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0000950170-24-002108 · ownership.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See footnotes

Disclosed balance after: 2,412.527

F1 · shares: Shares of common stock deferred into stock unit account pursuant to Huntington Ingalls Industries, Inc. 2022 Long-Term Incentive Stock Plan, in an exempt transaction pursuant to Rule 16b-3.

F2 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 and 2022 Long-Term Incentive Stock Plans. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0001209191-23-058363 · doc4.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 2,254.527

F1 · shares: Huntington Ingalls Industries, Inc. paid a cash dividend of $1.30 per share of common stock on December 8, 2023. Pursuant to the terms of the Huntington Ingalls Industries, Inc. 2012 and 2022 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: 0001209191-23-052002 · doc4.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 2,242.716

F1 · shares: Shares of common stock deferred into stock unit account pursuant to Huntington Ingalls Industries, Inc. 2022 Long-Term Incentive Stock Plan, in an exempt transaction pursuant to Rule 16b-3.

F2 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 and 2022 Long-Term Incentive Stock Plans. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0001209191-23-049173 · doc4.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 2,044.716

F1 · shares: Huntington Ingalls Industries, Inc. paid a cash dividend of $1.24 per share of common stock on September 8, 2023. Pursuant to the terms of the Huntington Ingalls Industries, Inc. 2012 and 2022 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.

F2 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 and 2022 Long-Term Incentive Stock Plans. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0001209191-23-041693 · doc4.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 2,032.76

F1 · shares: Shares of common stock deferred into stock unit account pursuant to Huntington Ingalls Industries, Inc. 2022 Long-Term Incentive Stock Plan, in an exempt transaction pursuant to Rule 16b-3.

F2 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 and 2022 Long-Term Incentive Stock Plans. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0001209191-23-036738 · doc4.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 1,858.76

F1 · shares: Huntington Ingalls Industries, Inc. paid a cash dividend of $1.24 per share of common stock on June 9, 2023. Pursuant to the terms of the Huntington Ingalls Industries, Inc. 2012 and 2022 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.

F2 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 and 2022 Long-Term Incentive Stock Plans. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0001209191-23-023514 · doc4.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: No plan indicated

Ownership: Indirect · See Footnote

Disclosed balance after: 1,848.114

F1 · shares: Shares of common stock deferred into stock unit account pursuant to Huntington Ingalls Industries, Inc. 2022 Long-Term Incentive Stock Plan, in an exempt transaction pursuant to Rule 16b-3.

F2 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 and 2022 Long-Term Incentive Stock Plans. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0001209191-23-018750 · doc4.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,657.114

F1 · shares: Pursuant to the terms of the Huntington Ingalls Industries, Inc. 2012 and 2022 Long-Term Incentive Stock Plan, the number of shares is determined by dividing the aggregate amount of the dividend by the closing price of a share of common stock on the date of the payment of the dividend.

F2 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 and 2022 Long-Term Incentive Stock Plans. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0001209191-23-002217 · doc4.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,647.502

F1 · shares: Shares of common stock deferred into stock unit account pursuant to Huntington Ingalls Industries, Inc. 2022 Long-Term Incentive Stock Plan, in an exempt transaction pursuant to Rule 16b-3.

F2 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 and 2022 Long-Term Incentive Stock Plans. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0001209191-22-061006 · doc4.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,472.502

F1 · kind: Huntington Ingalls Industries, Inc. paid a cash dividend of $1.24 per share of common stock on December 9, 2022. Pursuant to the terms of the Huntington Ingalls Industries, Inc. 2012 and 2022 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.

F2 · ownership.direct: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 and 2022 Long-Term Incentive Stock Plans. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0001209191-22-052859 · doc4.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,464.718

F1 · shares: Shares of common stock deferred into stock unit account pursuant to Huntington Ingalls Industries, Inc. 2022 Long-Term Incentive Stock Plan, in an exempt transaction pursuant to Rule 16b-3.

F2 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 and 2022 Long-Term Incentive Stock Plans. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0001209191-22-049738 · doc4.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,288.718

F1 · shares: Huntington Ingalls Industries, Inc. paid a cash dividend of $1.18 per share of common stock on September 9, 2022. Pursuant to the terms of the Huntington Ingalls Industries, Inc. 2012 and 2022 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.

F2 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 and 2022 Long-Term Incentive Stock Plans. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0001209191-22-041325 · doc4.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,282.289

F1 · shares: Shares of common stock deferred into stock unit account pursuant to Huntington Ingalls Industries, Inc. 2022 Long-Term Incentive Stock Plan, in an exempt transaction pursuant to Rule 16b-3.

F2 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 and 2022 Long-Term Incentive Stock Plans. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0001209191-22-036699 · doc4.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,101.289

F1 · shares: Huntington Ingalls Industries, Inc. paid a cash dividend of $1.18 per share of common stock on June 10, 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.

F1 · price: Huntington Ingalls Industries, Inc. paid a cash dividend of $1.18 per share of common stock on June 10, 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.

F2 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 Long-Term Incentive Stock Plan. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0001209191-22-023218 · doc4.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 1,095.191

F1 · shares: Shares of common stock deferred into stock unit account pursuant to Huntington Ingalls Industries, Inc. 2012 Long-Term Incentive Stock Plan, in an exempt transaction pursuant to Rule 16b-3.

F2 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 Long-Term Incentive Stock Plan. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0001209191-22-018599 · doc4.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 898.191

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.

F2 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 Long-Term Incentive Stock Plan. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0001209191-22-001935 · doc4.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 893.078

F1 · shares: Shares of common stock deferred into stock unit account pursuant to Huntington Ingalls Industries, Inc. 2012 Long-Term Incentive Stock Plan, in an exempt transaction pursuant to Rule 16b-3.

F2 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 Long-Term Incentive Stock Plan. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0001209191-21-069508 · doc4.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 678.078

F1 · shares: Huntington Ingalls Industries, Inc. paid a cash dividend of $1.18 per share of common stock on December 10, 2021. 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.

F2 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 Long-Term Incentive Stock Plan. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0001209191-21-059590 · doc4.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 673.803

F1 · shares: Shares of common stock deferred into stock unit account pursuant to Huntington Ingalls Industries, Inc. 2012 Long-Term Incentive Stock Plan, in an exempt transaction pursuant to Rule 16b-3.

F2 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 Long-Term Incentive Stock Plan. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0001209191-21-055943 · doc4.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 506.803

F1 · shares: Huntington Ingalls Industries, Inc. paid a cash dividend of $1.14 per share of common stock on September 10, 2021. 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.

F2 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 Long-Term Incentive Stock Plan. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0001209191-21-045716 · doc4.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 503.905

F1 · shares: Shares of common stock deferred into stock unit account pursuant to Huntington Ingalls Industries, Inc. 2012 Long-Term Incentive Stock Plan, in an exempt transaction pursuant to Rule 16b-3.

F2 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 Long-Term Incentive Stock Plan. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0001209191-21-040632 · doc4.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 350.905

F1 · shares: Huntington Ingalls Industries, Inc. paid a cash dividend of $1.14 per share of common stock on June 11, 2021. 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.

F2 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 Long-Term Incentive Stock Plan. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0001209191-21-025423 · doc4.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 349.104

F1 · shares: Shares of common stock deferred into stock unit account pursuant to Huntington Ingalls Industries, Inc. 2012 Long-Term Incentive Stock Plan, in an exempt transaction pursuant to Rule 16b-3.

F2 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 Long-Term Incentive Stock Plan. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0001209191-21-021061 · doc4.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 190.104

F1 · shares: Huntington Ingalls Industries, Inc. paid a cash dividend of $1.14 per share of common stock on March 12, 2021. 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.

F2 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 Long-Term Incentive Stock Plan. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.

SEC source: 0001209191-21-006300 · doc4.xml · nonDerivative · entry 1

O'Sullivan Stephanie L. · CIK 0001842003 · Director

10b5-1 filing: Not disclosed

Ownership: Indirect · See Footnote

Disclosed balance after: 189

F1 · ownership.nature: Represents vested restricted stock units credited to the Reporting Person's account pursuant to Huntington Ingalls Industries, Inc.'s 2012 Long-Term Incentive Stock Plan. Each director stock unit represents a right to receive one share of Issuer common stock (or cash equivalent value), which will generally become payable within 30 days following the date a non-employee director ceases to provide services as a member of the board of directors.