Company: NOC
Filing Date: 2025-05-28
Form Type: 424B5
Source: 0001193125-25-129530
Chunk: 4

Company: NORTHROP GRUMMAN CORP /DE/
Filing Date: 2025-05-28
Form: 424B5
Chunk 4
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2980 Fairview Park Drive Falls Church, Virginia 22042 (703) 280-2900 Exhibits to the filings will not be sent unless those exhibits have been specifically incorporated by reference in this prospectus supplement. S-2

Forward-looking statements and important factors This prospectus supplement, the accompanying prospectus and the documents incorporated by reference herein or therein contain statements that constitute “forward-looking statements” within the meaning of the Private Securities Litigation Reform Act of 1995. Words such as “will,” “expect,” “anticipate,” “intend,” “may,” “could,” “should,” “plan,” “project,” “forecast,” “believe,” “estimate,” “guidance,” “outlook,” “trends,” “goals” and similar expressions generally identify these forward-looking statements. Forward-looking statements include, among other things, statements relating to our future financial condition, results of operations and/or cash flows. Forward-looking statements are based upon assumptions, expectations, plans and projections that we believe to be reasonable when made, but which may change over time. These statements are not guarantees of future performance and inherently involve a wide range of risks and uncertainties that are difficult to predict. Specific risks that could cause actual results to differ materially from those expressed or implied in these forward-looking statements include, but are not limited to, those identified and discussed more fully under “Risk factors” in this prospectus supplement and under “Risk Factors” in our Annual Report on Form 10-Kfor the year ended December 31, 2024 and other important factors disclosed in this prospectus supplement, the accompanying prospectus, our reports, and from time to time in our other SEC filings. They include:

| • |     | our dependence on the United States (“U.S.”) government for a substantial portion of our business |

| • |     | significant delays or reductions in appropriations and/or for our programs, and U.S. government funding and                                                                                   
 program support more broadly, including as a result of a prolonged continuing resolution and/or government shutdown, and/or related to the global security environment or other global events |

| • |     | significant delays or reductions in payments as a result of or related to a breach of the debt ceiling |

| • |     | the use of estimates when accounting for our contracts and the effect of contract cost growth and our efforts to                                                                                                                                         
 recover or offset such costs and/or changes in estimated contract costs and revenues, including as a result of inflationary pressures, labor shortages, supply chain challenges