Company: NOC
Filing Date: 2025-05-28
Form Type: 424B5
Source: 0001193125-25-129530
Chunk: 6

Company: NORTHROP GRUMMAN CORP /DE/
Filing Date: 2025-05-28
Form: 424B5
Chunk 6
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 enable
continued growth, performing on our commitments and affordably delivering capability our customers need. With the investments we have made in advanced technologies, combined with our talented workforce and digital transformation capabilities, we are
well positioned to meet our customers’ needs today and in the future.

The principal executive offices of Northrop Grumman are located at 2980
Fairview Park Drive, Falls Church, Virginia 22042, and our telephone number is (703) 280-2900.

We maintain a
website at http://www.northropgrumman.com. The information contained at our website is not incorporated by reference in this prospectus supplement or the accompanying prospectus, and you should not consider it a part of this prospectus supplement or
the accompanying prospectus.

The information above concerning Northrop Grumman and our subsidiaries is only a summary and does not purport to be
comprehensive. For additional information about us, you should refer to the information described in “Where you can find more information” and “Incorporation by reference” in this prospectus supplement.

S-5

The Offering The following summary contains basic information about this offering. For a more complete understanding of this offering, we encourage you to read this entire prospectus supplement and the accompanying prospectus.

| Issuer: | Northrop Grumman Corporation. |

| Securities offered: | $500,000,000 aggregate principal amount of 4.650% Senior Notes due 2030. |

| $500,000,000 aggregate principal amount of 5.250% Senior Notes due 2035. |

| The notes will be issued as global notes to be deposited with the trustee as custodian for The Depository Trust Company (“DTC”) and delivered to purchasers in book-entry form. |

| Interest rate: | The 2030 notes will bear interest at the rate of 4.650% per annum, and the 2035 notes will bear interest at the rate of 5.250% per annum. |

| Use of proceeds: | We expect the net proceeds of this offering to be approximately $994,495,000, after deducting underwriting discounts but before deducting our estimated expenses of this offering. We intend to use the net proceeds of this offering for general 
 corporate purposes, which may include debt repayment (including our 7.875% and 7.750% senior notes due 2026), share repurchases and working capital. See “Use of Proceeds” in this