Company: NOC
Filing Date: 2025-05-28
Form Type: 424B5
Source: 0001193125-25-129530
Chunk: 1

Company: NORTHROP GRUMMAN CORP /DE/
Filing Date: 2025-05-28
Form: 424B5
Chunk 1
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 to the contrary is a criminal offense.

| Per 2030 note |     | Public   
 offering 
 price(1) |      99.974 | % |     | Underwriting 
 discounts    |     0.350 | % |     | Proceeds to Northrop 
 Grumman, before      
 expenses             |      99.624 | % |
|:--------------|:----|:---------|------------:|:--|:----|:-------------|----------:|:--|:----|:---------------------|------------:|:--|
| Total         |     | $        | 499,870,000 |   |     | $            | 1,750,000 |   |     | $                    | 498,120,000 |   |
| Per 2035 note |     |          |      99.725 | % |     |              |     0.450 | % |     |                      |      99.275 | % |
| Total         |     | $        | 498,625,000 |   |     | $            | 2,250,000 |   |     | $                    | 496,375,000 |   |
| Total         |     | $        | 998,495,000 |   |     | $            | 4,000,000 |   |     | $                    | 994,495,000 |   |

| (1) | Plus accrued interest, if any, from May 29, 2025, if settlement occurs after that date. |

We urge you to carefully read this prospectus supplement and the accompanying prospectus, which will describe the terms of the offering, before you make your investment decision. The underwriters expect to deliver the notes to purchasers in book-entry form only, through the facilities of The Depository Trust Company for the accounts of its participants, including Clearstream Banking, société anonyme, and the Euroclear Bank, S.A./N.V., against payment on or about May 29, 2025. Joint Book-Running Managers

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

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

Senior Co-Managers

| BNP PARIBAS |     | SMBC Nikko |     | TD Securities |

Co-Managers

| ANZ Securities UniCredit                  
 Capital Markets D