Company: NOC
Filing Date: 2025-05-28
Form Type: 424B5
Source: 0001193125-25-129530
Chunk: 3

Company: NORTHROP GRUMMAN CORP /DE/
Filing Date: 2025-05-28
Form: 424B5
Chunk 3
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us supplement is accurate as of the date on the front cover. You should assume that the information appearing in this
prospectus supplement, in the accompanying prospectus, in the documents incorporated by reference and in any related free writing prospectus is accurate only as of their respective dates. Our business, financial condition, results of operations,
cash flows and/or prospects may have changed materially since those dates.

S-1

Where you can find more information Northrop Grumman files annual, quarterly and current reports, proxy statements and other information with the SEC. We encourage you to read our periodic and current reports (including risk factors contained therein), as they provide additional information that prudent investors may find important. Our SEC filings are available to the public over the internet at the SEC’s website at http://www.sec.gov. Copies of certain information filed by us with the SEC are also available on our website at www.northropgrumman.com. Our website is not a part of, and is not incorporated by reference into, this prospectus supplement or the accompanying prospectus, and you should not consider it a part of this prospectus supplement or the accompanying prospectus. Incorporation by reference We are “incorporating by reference” information into this prospectus supplement, which means that we can disclose important information to you by referring you to another document that has been filed separately with the SEC. The information incorporated by reference is considered to be part of this prospectus supplement, and information that we file later with the SEC will automatically update and supersede the information contained in documents filed earlier with the SEC or contained in this prospectus supplement. This means that you must look at all of the SEC filings that we incorporate by reference to determine if any of the statements in this prospectus supplement or in any document previously incorporated by reference have been modified or superseded. We incorporate by reference in this prospectus supplement the documents listed below (File No. 001-16411)and any future filings made by us with the SEC under Section 13(a), 13(c), 14 or 15(d) of the Exchange Act, after the initial filing of this prospectus supplement and prior to the time that the offering is completed (in each case, other than those documents or the portions of those documents not deemed to be filed):

You may obtain copies, without charge, of documents incorporated by reference in this prospectus supplement, by requesting them in writing or by telephone from us as follows: Jennifer C. McGarey Corporate Vice President and Secretary