Company: NOC
Filing Date: 2025-05-28
Form Type: 424B5
Source: 0001193125-25-129530
Chunk: 31

Company: NORTHROP GRUMMAN CORP /DE/
Filing Date: 2025-05-28
Form: 424B5
Chunk 31
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| Siebert Williams Shank & Co., LLC   |     |            |   2,500,000 |     |            |   2,500,000 |
| Total                               |     | $          | 500,000,000 |     | $          | 500,000,000 |

The underwriting agreement provides that the obligations of the several underwriters to purchase the notes offered hereby are subject to certain conditions precedent and that the underwriters will purchase all of the notes offered by this prospectus supplement if any of these notes are purchased. The offering of the notes by the underwriters is subject to receipt and acceptance and subject to the underwriters’ right to reject any order in whole or in part. We have been advised by the representatives of the underwriters that the underwriters propose to offer the notes initially to the public at the initial public offering price set forth on the cover of this prospectus supplement and to dealers at a price that represents a concession not in excess of 0.200% of the principal amount of the 2030 notes or 0.250% of the principal amount of the 2035 notes. The underwriters may allow, and these dealers may re-allow,a concession of not more than 0.150% of the principal amount of the 2030 notes or 0.200% of the principal amount of the 2035 notes to other dealers. After the initial public offering, the representatives of the underwriters may change the offering price and other selling terms. In addition, we estimate that our expenses of this offering, excluding underwriting discounts, will be approximately $3.0 million. We have agreed to indemnify the several underwriters and their officers, directors and controlling persons against some specified types of liabilities, including liabilities under the Securities Act of 1933, as amended (the “Securities Act”), and to contribute to payments any of those persons may be required to make in respect of any of these liabilities. S-23

The notes are new issues of securities with no established trading market. The notes will not be listed on
any securities exchange. The underwriters have advised us that they may make a market in the notes after completion of the offering, but will not be obligated to do so and may discontinue any market-making activities at any time without notice. No
assurance can be given as to the liquidity of the trading market for the notes or that an active public market for the notes will develop. If an active public trading market for the notes