| 3/12/2025 | DDHY | Moody's lifts Obrascon Huarte
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| 2/19/2025 | DDHY | Moody's puts Obrascon on review for upgrade
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| 9/24/2024 | DDHY | Moody's trims OHLA, adds LD
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| 6/28/2024 | DDHY | Moody's trims OHLA
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| 3/8/2022 | DDHY | Moody's upgrades Obrascon Huarte
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| 9/16/2021 | DDHY | Fitch ups Obrascon Huarte Lain, then withdraws ratings
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| 7/6/2021 | DDHY | Moody's ups Obrascon, rates Caa2
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| 6/30/2021 | BKDDHY | Fitch slashes Obrascon Huarte
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| 6/28/2021 | DDHYLM | Obrascon completes restructuring, including over 2022, 2023 notes
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| 1/26/2021 | BKDDHY | Moody’s cuts Obrascon Huarte
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| 1/25/2021 | BKDDHY | Fitch cuts Obrascon Huarte Lain
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| 9/4/2020 | DDHYLM | Obrascon noteholders approve proposals regarding 2022, 2023 notes
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| 8/14/2020 | BKDDHY | Moody's trims Obrascon
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| 8/4/2020 | DDHYLM | Obrascon extends consent solicitation for 4¾%, 5½% notes to Sept. 4
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| 7/21/2020 | DDHYLM | Obrascon extends consent solicitation for 4¾%, 5½% notes
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| 7/16/2020 | BKCVDDHY | Fitch cuts Obrascon Huarte Lain
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| 7/16/2020 | DDHYLM | Obrascon extends consent solicitation for 4¾%, 5½% notes
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| 7/6/2020 | DDHYLM | Obrascon launches consent solicitation for 4¾%, 5½% notes
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| 10/10/2019 | CVDDHY | Fitch downgrades Obrascon
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| 11/16/2018 | CVDDHY | Moody’s lowers Obrascon
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| 12/1/2017 | CVDDHY | Moody’s upgrades Obrascon Huarte
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| 10/17/2017 | CVDDHY | Moody’s might lift Obrascon Huarte
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| 11/16/2016 | DD | S&P lowers EP Energy, rates notes BB-
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| 11/16/2016 | CVDDHY | Moody’s drops Obrascon Huarte, debt to Caa1
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