Company: NOC
Filing Date: 2025-05-27
Form Type: 424B5
Source: 0001193125-25-126289
Chunk: 59

Company: NORTHROP GRUMMAN CORP /DE/
Filing Date: 2025-05-27
Form: 424B5
Chunk 59
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 applicable prospectus supplement may provide that the
original issue date for your securities may be more than two scheduled business days after the trade date for your securities. Accordingly, in such a case, if you wish to trade securities on any date prior to the second business day before the
original issue date for your securities, you will be required, by virtue of the fact that your securities initially are expected to settle in more than two scheduled business days after the trade date for your securities, to make alternative
settlement arrangements to prevent a failed settlement.

Each series of the debt securities issued hereunder will be a new issue of
securities, will have no prior trading market, and may or may not be listed on a national securities exchange. Any underwriters to whom we sell debt securities for public offering and sale may make a market in the securities, but such underwriters
will not be obligated to do so and may discontinue any market making at any time without notice. We cannot assure you that there will be a market for the offered securities.

LEGAL MATTERS

Unless the applicable prospectus supplement indicates otherwise, Wilmer Cutler Pickering Hale and Dorr LLP, will issue an opinion about the
validity of the senior debt securities and common stock. Underwriters, dealers or agents, who we will identify in a prospectus supplement may have their counsel opine about certain legal matters relating to the securities.

EXPERTS

The consolidated financial statements of Northrop Grumman Corporation and subsidiaries (the “Company”) as of December 31, 2022 and
2021, and for each of the three years in the period ended December 31, 2022, incorporated by reference in this Prospectus, and the effectiveness of the Company’s internal control over financial reporting have been audited by Deloitte &
Touche LLP, an independent registered public accounting firm, as stated in their reports. Such financial statements are incorporated by reference in reliance upon the reports of such firm given their authority as experts in accounting and auditing.

14

$ % Senior Notes due 20 $ % Senior Notes due 20 Prospectus supplement Joint Book-Running Managers

| Goldman Sachs & Co. LLC |     | Mizuho |     | Morgan Stanley |

| BofA Securities |     | J.P. Morgan |     | US Bancorp |     | Wells Fargo Securities |

, 2025