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| 9/8/2025 | BKIG | Moody's raises Northrop Grumman |
| 5/27/2025 | BKIG | Moody's assigns Northrop notes Baa1 |
| 10/22/2024 | BKIG | Moody’s views Northrop Grumman positively |
| 2/6/2023 | BKIG | Fitch rates Northrop Grumman notes BBB+ |
| 8/23/2022 | BK | Northrop Grumman enters into $2.5 billion five-year revolver |
| 3/11/2022 | BKIG | Fitch ups Northrop Grumman |
| 9/3/2021 | BKIG | Moody's gives Northrop Grumman notes Baa1 |
| 8/2/2021 | BKIG | Moody's ups Northrop Grumman unsecured |
| 8/2/2021 | BKIG | Fitch rates Northrop Grumman notes BBB |
| 3/15/2021 | BKIG | Fitch shifts Northrop Grumman view to positive |
| 2/27/2019 | BKIG | S&P upgrades Huntington Ingalls |
| 6/7/2018 | BKIG | S&P lowers Northrop Grumman |
| 10/10/2017 | BKIG | Fitch cuts Northrop Grumman |
| 9/26/2017 | BKIG | S&P upgrades Northrop debt |
| 9/18/2017 | BKIG | Moody’s affirms Northrop Grumman |
| 9/18/2017 | BKIG | Fitch reviews Northrop Grumman |