Company: NOC
Filing Date: 2025-05-28
Form Type: 424B5
Source: 0001193125-25-129530
Chunk: 40

Company: NORTHROP GRUMMAN CORP /DE/
Filing Date: 2025-05-28
Form: 424B5
Chunk 40
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part” of the Registration Statement prepared or certified by an accountant within the meaning of Sections 7 and 11 of the Securities Act.

S-28

PROSPECTUS

Northrop Grumman Corporation

### SENIOR DEBT SECURITIES

### COMMON STOCK
We may offer and sell any combination of the securities described in this prospectus from time to time in one or more offerings, in one or
more series and in amounts, at prices and on terms that we will determine at the time of the offering.

We will provide the specific terms
of the securities, including their offering prices, and the methods by which we will sell them, in supplements to this prospectus. The prospectus supplements may also add, update or change information contained in this prospectus. You should read
this prospectus and any accompanying prospectus supplements carefully before you make your investment decision.

We may offer and sell the
securities on an immediate, continuous or delayed basis directly to investors or through underwriters, dealers or agents, or through a combination of these methods.

Northrop Grumman’s common stock is listed on The New York Stock Exchange under the symbol “NOC”.

Investing in these securities involves certain risks. See “ Risk Factors” included in any accompanying prospectus supplement and in the documents incorporated by reference in this prospectus for a discussion of the factors you should carefully consider before deciding to purchase these securities.

Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or passed upon the adequacy or accuracy of this prospectus. Any representation to the contrary is a criminal offense.

The date of this prospectus is March 13, 2023.

TABLE OF CONTENTS

| ABOUT THIS PROSPECTUS                            |     |  1 |
| WHERE YOU CAN FIND MORE INFORMATION              |     |  1 |
| INCORPORATION BY REFERENCE                       |     |  1 |
| FORWARD-LOOKING STATEMENTS AND IMPORTANT FACTORS |     |  2 |
| RISK FACTORS                                     |     |  3 |
| NORTHROP GRUMMAN CORPORATION                     |     |  3 |
| USE OF PROCEEDS                                  |     |  3 |
| DESCRIPTION OF SENIOR DEBT SECURITIES            |     |  4 |
| DESCRIPTION OF COMMON STOCK                      |     | 10 |
| PLAN OF DISTRIBUTION                             |     | 11 |
| LEGAL MATTERS                                    |     | 14 |
| EXP