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| 1/24/2018 | DDEM | Moody’s raises Usiminas to B2/Ba1.br |
| 10/19/2017 | DDEM | Fitch upgrades Usiminas |
| 9/19/2017 | DDEM | S&P upgrades Usiminas |
| 3/10/2017 | DDEM | Moody’s upgrades Usiminas, notes |
| 12/7/2016 | DDEM | Moody’s raises Usiminas to Caa2 |
| 10/21/2016 | DDEM | Fitch raises Usiminas, notes to CCC |
| 10/4/2016 | BKCVDDEMHY | S&P global speculative-grade default rate increases to 4.04% in August |
| 9/14/2016 | DDEM | Fitch downgrades Usiminas |
| 9/14/2016 | DDEM | S&P upgrades Usiminas |
| 4/4/2016 | DDEM | Moody’s lowers Usiminas to Ca/Ca.br |
| 3/24/2016 | BKCVDDEMHY | Prospect News reports two new defaults for March 17-March 23, S&P five |
| 3/23/2016 | DDEM | S&P downgrades Usiminas |
| 3/16/2016 | DDEM | Fitch downgrades Usiminas |
| 3/9/2016 | BKCVDDEMHY | S&P global speculative-grade default rate falls to 2.66% in January |
| 1/29/2016 | DDEM | S&P downgrades Usiminas, debt |
| 1/27/2016 | DDEM | Moody’s downgrades Usiminas to Caa1 |