Letter to Our Stockholders

March 21, 2022

Dear Fellow Stockholders:

On behalf of the Board of Directors and management team of Huntington Ingalls Industries, I would like to invite you to attend the 2022 Annual Meeting of Stockholders. We will hold our annual meeting virtually, exclusively by live webcast, on Tuesday, May 3, 2022, at 11:00 a.m., Eastern Daylight Time. You will be able to attend and participate in the annual meeting online, vote your shares electronically and submit your questions prior to and during the meeting.

The accompanying Notice of 2022

March 20, 2023 Dear Fellow Stockholders: On behalf of the Board of Directors and management team of Huntington Ingalls Industries, I would like to invite you to attend the 2023 Annual Meeting of Stockholders. We will hold our annual meeting virtually, exclusively by live webcast, on Tuesday, May 2, 2023, at 11:00 a.m., Eastern Daylight Time. You will be able to attend and participate in the annual meeting online, vote your shares electronically and submit your questions prior to and during the meeting. The accompanying Notice of 2023 Annual Meeting and Proxy Statement describe the matters on which you, as a stockholder, may vote at the annual meeting, and include details of the business to be conducted at the meeting.

As a way to conserve natural resources and reduce annual meeting costs, we are electronically distributing proxy materials as permitted under rules of the Securities and Exchange Commission. Many of you will receive a Notice of Internet Availability of Proxy Materials containing instructions on how to access the proxy materials via the Internet. You can also request mailed paper copies if you prefer. You can expedite delivery and reduce our mailing expenses by confirming in advance your preference for electronic delivery of future proxy materials. For more information on how to take advantage of this cost-saving service, please see page 14 of the proxy statement.

If you plan to attend the annual meeting virtually via live webcast, you must follow the instructions contained in the Notice and on pages 11 (for record stockholders), 12 (for beneficial stockholders) and 105101 of the proxy statement.

Your vote is very important. Whether or not you plan to attend the annual meeting, I encourage you to vote your shares in advance. Stockholders can submit their votes over the Internet at the web address included in the Notice of Internet Availability of Proxy Materials. If you received a proxy card, you can submit your votes over the Internet at the web address included in the proxy card, by telephone through the number included in the proxy card, or by signing and dating your proxy card and mailing it in the prepaid and addressed envelope.

Thank you for your interest in and support of Huntington Ingalls Industries.HII.

Sincerely,

Admiral Kirkland H. Donald

U.S. Navy (Ret.)

Chairman of the Board

Proxy Statement—Table of Contents

General Information About the Annual Meeting and Voting

Internet. We believe this This e-proxy process expedites receipt of proxy materials by stockholders, while also lowering our costs and reducing the environmental impact of our annual meeting. We have used this e-proxy process to furnish proxy materials over the Internet to certain of our stockholders over the Internet.who have so elected.

If you received a Notice of Internet Availability of Proxy Materials in the mail and would like to receive a printed copy of our proxy materials, you should follow the instructions for requesting these materials provided in the Notice of Internet Availability of Proxy Materials.

RECORD DATE AND VOTING

Stockholders owning our common stock at the close of business on March 9, 2022,8, 2023, the record date, or their legal proxy holders, are entitled to vote at the annual meeting. The Board strongly encourages you to vote. Your vote is important. Voting early helps ensure we receive a quorum of shares necessary to hold the annual meeting. When stockholders do not vote, the stockholders who do vote influence the outcome of the matters on which they vote in greater proportion than their percentage ownership of HII shares.

We have two types of stockholders: stockholders of record and “street name” stockholders. Stockholders of record are stockholders who own their shares in their own names on the company’s books. Street name stockholders are stockholders who own their shares through a bank, broker or other holder of record.

Voting by Stockholders of Record. If you are a stockholder of record, you have four voting options. You may vote:

If you have Internet access, we encourage you to vote over the Internet. It is convenient and it saves us significant postage and processing costs. In addition, when you vote by proxy over the Internet or by telephone prior to the meeting date, your proxy vote is recorded immediately, and there is noeliminating the risk that postal delays will cause your proxy vote to arrive late and therefore not be counted.

Internet and telephone voting facilities for stockholders of record are available 24 hours a day. The Internet and telephone voting procedures verify you are a stockholder of record by use of a control number and enable you to confirm your voting instructions have been properly recorded. If you vote by Internet or telephone, you do not need to return your proxy card (if you received a proxy card).

You will also be able to attend, participate and vote your shares electronically at the annual meeting online by visiting: https://meetnow.global/MW6JXNH.MKKD465. If you are a stockholder of record (i.e., you hold your shares through our transfer agent, Computershare), you do not need to register to participate in the annual meeting virtually on the Internet. Please follow the instructions on the notice or proxy card that you received.

General Information About the Annual Meeting and Voting

Revoking Your Proxy for Stockholders of Record. If you are a stockholder of record and you vote by proxy using any method, you may revoke your proxy later and change your vote at any time before the polls close at the annual meeting. You may do this by:

Only the most recent proxy vote will be counted, and all others will be discarded regardless of the method of voting.

Voting by Street Name Stockholders. If your shares are held in “street name” through a broker, bank or other nominee, please refer to the instructions they provide regarding how to vote your shares or to revoke your voting instructions. The availability of telephone and Internet voting depends upon the voting processes of the broker, bank or other nominee.

If you are a street name stockholder, you must register with Computershare no later than 5:00 p.m., Eastern Daylight Time, on April 28, 2022,27, 2023, to participate in the annual meeting. To do so you must submit proof of your proxy power (legal proxy) reflecting your HII share holdings, along with your name and email address, to Computershare. Requests for registration must be labeled as “Legal Proxy.” You will receive a confirmation of your registration by email after we receive your registration materials. Requests for registration should be directed to us as follows:

By email: Forward the email from your broker, or attach an image of your legal proxy, to

legalproxy@computershare.com

By mail:

Computershare

Huntington Ingalls Industries, Inc. Legal Proxy

P.O. Box 43001

Providence, RI 02940-3001

Whether or not you plan to attend the virtual annual meeting, we urge you to have your proxy vote recorded in advance of the meeting. If you attend the annual meeting and vote at the annual meeting, any prior proxy votes you submitted, whether by Internet, telephone or mail, will be superseded by the vote you cast at the annual meeting. In any event, the method by which you vote your proxy will not limit your right to vote at the annual meeting if you decide to virtually attend.

Confidential Voting. We treat your vote as confidential to protect the privacy of our stockholder votes. Proxies and voting instructions provided to banks, brokers and other holders of record are kept confidential. Only the proxy solicitor, the proxy tabulator and the inspector of elections have access to the proxies and voting instructions.

General Information About the Annual Meeting and Voting

A quorum must be present to transact business at the annual meeting. A quorum will be present if a majority of the outstanding shares entitled to vote as of the record date are present, in person or by proxy. If you indicate an abstention as your voting preference on all matters, your shares will be counted toward a quorum but will not be voted on any matter. If you are a street name stockholder and do not vote your shares, your bank, broker or other holder of record may vote your shares on the proposal to ratify the appointment of our independent auditors, which is known as a routine matter. Votes by a bank, broker or other holder of record on any routine matter will count for purposes of determining a quorum. In the absence of a quorum, the chairperson of the meeting may adjourn the meeting, and, at any reconvened meeting following such an adjournment at which a quorum is present, any business that might have been transacted at the original meeting may be transacted.

If you are a street name stockholder and do not vote your shares, your bank, broker or other holder of record can vote your shares in its discretion only on Item 3 described in this proxy statement. If you do not give your bank, broker or other holder of record instructions on how to vote your shares on Items 1, 2 4 and 54 described in this proxy statement, your shares will not be voted on those matters. Such “broker non-votes” will have no impact on the results of the vote on Items 1, 2 4 and 5.4.

If you hold shares through an HII employee benefit plan, you cannot vote your shares directly. Instead, you can provide voting instructions to the plan trustee, who will vote the shares on your behalf. HII employee benefit plans that hold HII shares provide for pass-through voting to plan participants and designate that plan participants are “named fiduciaries” under the Employee Retirement Income Security Act of 1974 (“ERISA”) for purposes of voting their shares and those shares for which plan participants do not provide voting directions. If you are a plan participant and do not vote your shares, your trustee will vote your shares in accordance with the terms of the relevant plan. As such, your trustee may vote your shares in the same proportion as shares held by the plan for which voting instructions have been received from other participants, which are “named fiduciaries,” unless contrary to ERISA.

The required vote and method of calculation for the matters to be presented at the annual meeting are as follows:

Item 1—Proposal to Elect Directors

Directors will be elected by a pluralitymajority of the shares present in person or by proxy at the annual meeting or any adjournment thereof and entitled to vote on the election of directors. Plurality voting means the 13votes cast—that is, a director nominees receiving the most votes will be elected toif the Board. If you do not want your shares to be voted with respect to a particular director nominee, you may “withhold” your vote with respect to that nominee. If a director nominee receives a greater number of votes “withheld” for his or her election than votes cast “for” his or her election,shares voted in favor of such nomineedirector exceeds the number of shares voted against such director. Abstentions will be required underhave no effect on the majority vote director resignation policy included in our Corporate Governance Guidelines to submit an offerresults of resignation to the Board for its consideration.vote. If you are a street name stockholder and do not vote your shares, your bank, broker or other holder of record cannot vote your shares on this item, and broker non-votes will have no effect on the outcome of the vote.

Item 2—Proposal to Approve Executive Compensation on an Advisory Basis

The executive compensation of our NEOs will be approved as an advisory recommendation to the Board if the number of shares voted in favor exceeds the number of shares voted against. Abstentions will have no effect on the results of the vote. If you are a street name stockholder and do not vote your shares, your bank, broker or other holder of record cannot vote your shares on this item, and broker non-votes will have no effect on the outcome of the vote. Although the vote on this item is non-binding, the Compensation Committee will review the results of the vote, undertake to determine why stockholders voted against the company’s executive compensation and consider itthe reasons in making future decisions concerning executive compensation.

General Information About the Annual Meeting and Voting

If you are a stockholder of record, you may enroll in the electronic delivery service by going directly to www.envisionreports.com/HII. You may revoke your electronic delivery election at this sitewebsite at any time and request a paper copy of the proxy statement and annual report.

Governance of the Company

Governance and Policy Committee then recommends the candidate(s) to the full Board, with the full Board selecting the candidate(s) to be nominated for election by our stockholders or to be elected by the Board to fill a vacancy.

In connection with its recommendations of director nominees to the Board for election at each annual meeting, the Governance and Policy Committee considers the size of the Board and the criteria set forth above to recommend nominees who, individually and as a group and collectively with directors who are already serving on the Board,other director nominees, the committee believes comprise the skills, experience and qualifications the Board needs to achieve its mission. Accordingly, in connection with the annual meeting director nomination process, the Governance and Policy Committee annually reviews the composition of the Board as a whole and makes recommendations if necessary, to achieve the optimal mix of experience, expertise, skills, specialized knowledge, diversity and other factors.

Stockholders who wish to recommend director candidates for consideration by the Governance and Policy Committee must submit the name and relevant information about the candidate in writing to the Corporate Secretary. All director candidates recommended by stockholders are required to meet the criteria for directors described above, and candidates who meet such criteria will be evaluated by the Governance and Policy Committee. In accordance with our Corporate Governance Guidelines, the Governance and Policy Committee will evaluate director candidates recommended by stockholders in the same manner as candidates identified through other means.

Stockholders who wish to nominate a person for election as a director at an annual meeting must follow the procedures set forth in our bylaws, as described beginning on page 30 of this proxy statement. Additionally, our bylaws include a proxy access right, which enables a stockholder or a group of up to 20 stockholders owning continuously for at least three years an amount of shares that constitutes 3% or more of our outstanding common stock as of the date of nomination to nominate and include in our proxy materials director candidates constituting up to the greater of 25% of the number of directors then in office or two directors, subject to the requirements specified in our bylaws. Stockholders who wish to nominate director candidates for inclusion in our proxy materials under our proxy access bylaw provisions must satisfy the requirements in our bylaws, as described under the heading “Communications and Company Documents—Future Stockholder Proposals and Nominations of Directors” of this proxy statement. The Board expects to evaluate any director candidates nominated through the proxy access process in athe same manner similar to that applied toas other director candidates.candidates are evaluated.

MAJORITY VOTE DIRECTOR RESIGNATION POLICY

Our Corporate Governance Guidelines include a majority vote director resignation policy. Under such policy, any nominee for director who receives a greater number of votes “withheld” from his or her election than votes “for” such election (a “Majority Withhold Vote”) in an uncontested election of directors must tender to the Board his or her offer of resignation within five days following certification of the stockholder vote. The Governance and Policy Committee will promptly consider the resignation offer and make a recommendation to the Board to accept or reject the tendered offer of resignation. The Board will act on the Governance and Policy Committee’s recommendation within 90 days following certification of the stockholder vote. The Board will then promptly disclose its decision to accept or reject the director’s resignation offer, including its rationale, in a report furnished to or filed with the SEC.

The Governance and Policy Committee in making its recommendation, and the Board in making its decision, will consider the best interests of the company and our stockholders and may consider any other factors or other information that it considers appropriate and relevant, including but not limited to:

Governance of the Company

Any director who tenders his or her offer of resignation under our majority vote director resignation policy will not participate in the Governance and Policy Committee deliberation or recommendation or Board deliberation or action to accept or reject the resignation offer. If a majority of the Governance and Policy Committee received a Majority Withhold Vote at the same election, then the independent directors (other than those who received a Majority Withhold Vote in that election) will instead appoint a committee among themselves to consider the resignation offers and recommend to the Board whether to accept them. If, however, the independent directors who did not receive a Majority Withhold Vote constitute two or fewer directors, all independent directors may participate in the action to accept or reject the resignation offers, except that each director who has tendered his or her offer of resignation will recuse himself or herself from the deliberations and voting with respect to his or her individual offer to resign.

If a director’s resignation offer is not accepted by the Board, that director will continue to serve for the term for which he or she was elected and until his or her successor is duly elected, or his or her earlier death, disability, resignation or removal. If a director’s resignation offer is accepted by the Board, then the Board, in its sole discretion in accordance with our bylaws, may fill any resulting vacancy or may decrease the size of the Board.

STOCKHOLDERS RIGHT TO NOMINATE PROXY ACCESS NOMINEES

Our bylaws provide our stockholders proxy access rights. Under Section 2.15 of our bylaws, we are required to include in our proxy materials for an annual meeting any stockholder nominee who is nominated by an “Eligible Stockholder.” An “Eligible Stockholder” is any stockholder or group of up to 20 stockholders that has beneficially owned continuously for at least three years an amount of shares that constitutes 3% or more of our outstanding common stock as of the date of nomination. Eligible Stockholders must provide proof of ownership of the requisite amount of stock for the three-year time period and represent that the shares were acquired in the ordinary course of business and not to change or influence control of the company. Eligible Stockholders must also provide certain other written representations, warranties and agreements to the company, including an agreement to assume liability from any legal or regulatory violation arising out of the Eligible Stockholder’s communication with our stockholders and to comply with all applicable laws and regulations, as described in more detail in Section 2.15 of the bylaws.

Governance of the Company

determine whether the Stockholder Nominee meets the independence and other general requirements for directors set forth in our bylaws and our Corporate Governance Guidelines.

Stockholders who would like to nominate candidates using proxy access should refer to Section 2.15 of our bylaws, which sets forth all the requirements for proxy access nominations. The Board may exclude any Stockholder Nominee from our proxy materials if the Stockholder Nominee or Eligible Stockholder(s) fail to meet the requirements or provide the undertakings set forth in our bylaws or Corporate Governance Guidelines and for other reasons set forth in our bylaws. See “Communications and Company Documents—Future Stockholder Proposals and Nominations of Directors.”

DIRECTOR INDEPENDENCE

The Board makes determinations regarding the independence of our directors on an annual basis, based upon the Governance and Policy Committee’s evaluation of director independence and related recommendations to the Board. Under our Corporate Governance Guidelines, to be considered independent: (i) a director must be independent as determined in accordance with the NYSE Listed Company Manual and (ii) in the Board’s judgment, the director must not have a material relationship with the company (either directly or as a partner, shareholder or officer of an organization that has a relationship with the company).

The Board has considered relevant relationships between the company and each non-employee director to determine compliance with the independence requirements included in our Corporate Governance Guidelines. Based upon its review, the Board has determined that Mr. Bilden, General Collins, Mr. Denault, Admiral Donald, Ms. Harker, Mr. Jimenez, Ms. Kelly, Ms. McKibben, Ms. O’Sullivan, Mr. Schievelbein, Mr. Welch and Mr. Wilson, who currently comprise the Board’s non-employee directors, are independent. The Board has also determined that each current member of the Audit Committee satisfies the additional SEC independence requirements applicable to audit committee members, and that each current member of the Compensation Committee satisfies the enhanced independence requirements of the NYSE listing standards.

BOARD LEADERSHIP STRUCTURE

The Board believes one of its primary responsibilities is to evaluate and determine from time to time the optimal Board leadership structure to provide effective oversight of the company. Our bylaws establish the position of Chairman of the Board and direct that the Board will designate the Chairman. Our Corporate Governance Guidelines provide further that the Board believes it is in the best interests of the company and its stockholders for the Board to have the flexibility to determine the best director to serve as Chairman. The independent directors address the Chairman role on at least an annual basis,annually, comparing the advantages and disadvantages of a combined chairman and chief executive officer role and separate chairman and chief executive officer roles in the context of our operating and governance environment over time.

Governance of the Company

Conclusion.Conclusion. All of our directors play an active role overseeing the companyHII at both the Board and committee levels. The Board is currently comprised of 11 independent directors and two one non-independent directors, one director, who serves as our Chief Executive Officer and the other who serves as Executive Vice Chairman of the Board after stepping down as our Chief Executive Officer. Our independent directors are skilled and experienced leaders in business, industry, the military and government. Our independent directors are effective in collaboratingeffectively collaborate with management and thoroughly evaluatingevaluate management proposals, made by management, and an independent Board leader facilitates this relationship. We therefore believe a non-executive Chairman of the Board, along with 10 other strong independent directors, is an appropriate and effective model at this time to oversee management of the companyHII and to provide advice and counsel to the Chief Executive Officer and other executive management of the company.

BOARD COMMITTEE FUNCTIONS AND MEMBERSHIP

The Board has five standing committees: Audit, Compensation, Cybersecurity, Governance and Policy and Finance. Each of the Audit, Compensation and Governance and Policy Committees is constituted and operated in accordance with SEC requirements and the NYSE’s corporate governance listing standards; thestandards. The Cybersecurity Committee and Finance CommitteesCommittee are not required by the SEC or the NYSE listing standards and are therefore not subject to any such requirements or standards. Each Board committee is governed by a written charter, which sets forth the responsibilities of the committee, including the responsibilities described in this section. Each charter can be viewed on our website at www.hii.com and is available in print to any stockholder requesting a copy. All members of each Board committee are independent, as determined under the corporate governance listing standards of the NYSE.

Audit Committee. The Audit Committee’s responsibilities include:

Governance of the Company

The current members of the Cybersecurity Committee are Mr. Bilden (chairman)Ms. O’Sullivan (chairwoman), General Collins, Admiral Donald Ms. O’Sullivan and Mr. Wilson. Mr. Bilden was the Chairman of the Cybersecurity Committee until he resigned from the Board in July 2022.

Governance and Policy Committee. The Governance and Policy Committee’s responsibilities include:

Governance of the Company

emerging risks, and periodic reports on individual enterprise risks and ERM program activities to executive management and the Board. Our ERM process is managed by an Enterprise Risk Committee, comprised of management from across business units and programmatic and functional disciplines within the company. The Enterprise Risk Committee is responsible for overseeing the enterprise risk assessment process, overseeing development of, and monitoring, enterprise risk mitigation plans, assessing risk correlations, monitoring emerging and evolving risks and generating data and reports to facilitate management decision-making and the Board’s risk oversight function. While the Board and its committees oversee risk management, management is responsible for identifying, assessing, managing and mitigating risks.

The Board and its committees are responsible for understanding and evaluating the company’s ERM processes to determine whether they are achieving their objectives. Management briefs the Board on an annual basis on the company’s overall ERM program, which includes a report on the company’s annual enterprise risk assessment process, a review of the company’s latest roster of enterprise risks, assessments of the probabilities of such risks occurring and their potential severity and assessments of management’s capability of mitigating individual enterprise risks. Management also briefs the Board or a Board committee on a periodic basis on individual significant risks, which includes a report from management’s risk owner and the related risk mitigation plan. The Board is updated on an interim basis on any changes to the company’s enterprise risk roster and any other material developments affecting the company’s ERM program.

The Governance and Policy Committee is responsible under its charter for developing and recommending to the full Board a methodology for the Board’s oversight of risk management and for monitoring the Board’s oversight of risk management. In connection with this responsibility, the Governance and Policy Committee evaluates the enterprise risk roster generated from the company’s enterprise risk assessment, allocates oversight responsibilities among the full Board and individual standing Board committees and develops a risk briefing schedule, based upon management’s relative prioritization of enterprise risks.

Risks are inherent in the company’s strategic decisions, and oversight of risk management is a continuous process. The Board and its committees facilitate open communication between management and the directors and foster an appropriate culture of integrity and risk awareness. The Board and its committees engage in communications throughout the year with management regarding risk assessment and management, and directors are encouraged to communicate directly with senior management, which they do on a routine basis.

While the full Board has ultimate responsibility for the oversight of risk management, Board committees oversee certain individual enterprise risks relating to matters within the scopes of their respective responsibilities and report to the full Board with respect to this oversight. In December 2019, in response to the increasing risk exposure presented by data and cybersecurity, the Board formed a standing Cybersecurity Committee of the Board. The Board believes that dedication of a standing committee to cybersecurity facilitates: a deeper understanding by members of the Cybersecurity Committee of the company’s data and cybersecurity risk exposure; the opportunity for committee members to have a deeper data and cybersecurity knowledge base; and closer Board oversight of the company’s management and mitigation of data and cybersecurity risks. Prior to formation of the Cybersecurity Committee, an ad hoc cybersecurity committee of the Board played a role in the Board’s oversight of cybersecurity.