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| 3/3/2021 | CVIG | S&P trims National Grid North America |
| 3/2/2021 | CVIG | Moody’s nicks National Grid |
| 8/25/2020 | CVIG | S&P shifts National Grid North America view to negative |
| 8/14/2020 | CVIG | Moody’s acts on National Grid units |
| 3/29/2019 | CVIG | Moody’s cuts KeySpan, Niagara Mohawk debt |
| 10/15/2015 | IG | S&P downgrades KeySpan Gas |
| 10/7/2015 | CVIG | Moody’s: Baa1 to National Grid convertibles |
| 2/13/2013 | IG | Moody's rates National Grid notes Baa1 |