{
  "spec_version": "3",
  "endpoint": "decisions",
  "stock_code": "8411",
  "company_name": "みずほフィナンシャルグループ",
  "content_lang": "ja",
  "meta_lang": "en",
  "canonical_url": "https://the-shashi.com/tse/8411/",
  "api_url": "/api/8411/decisions.json",
  "updated": "2026-08-05",
  "license": "© 2026 Yutaka Sugiura. All rights reserved.",
  "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/8411/",
  "count": 7,
  "description": "Index of this company's management decisions. One decision = one endpoint: follow api_url for the full dossier (background, the decision itself, outcome, quoted primary sources and references).",
  "decisions": [
    {
      "slug": "mizuho-formation-2000",
      "url": "/tse/8411/decisions/mizuho-formation-2000/",
      "api_url": "/api/8411/decisions/mizuho-formation-2000.json",
      "year": 2000,
      "month": null,
      "type": "merger",
      "tags": [
        "ma-merger",
        "cp-holdings"
      ],
      "title": "第一勧業銀行・富士銀行・日本興業銀行の経営統合とみずほ誕生（2000年成立）",
      "subtitle": "なぜ三大銀行は手を結び、国内初のメガバンクはどのように生まれ、そして発足直後につまずいたのか？",
      "status": "completed",
      "status_label": "成立"
    },
    {
      "slug": "one-mizuho-2013",
      "url": "/tse/8411/decisions/one-mizuho-2013/",
      "api_url": "/api/8411/decisions/one-mizuho-2013.json",
      "year": 2013,
      "month": null,
      "type": "reorganization",
      "tags": [
        "ma-merger"
      ],
      "title": "One MIZUHO——みずほ銀行とみずほコーポレート銀行の合併と2行分立の解消",
      "subtitle": "震災の義援金が招いた大規模障害のあと、みずほはなぜ2つの銀行を1つへ畳み直したのか",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "structural-reform-2017",
      "url": "/tse/8411/decisions/structural-reform-2017/",
      "api_url": "/api/8411/decisions/structural-reform-2017.json",
      "year": 2017,
      "month": 11,
      "type": "restructuring",
      "tags": [
        "tr-restructuring"
      ],
      "title": "抜本的構造改革——約1.9万人・約100拠点削減による低収益体質へのメス",
      "subtitle": "低金利で痩せた邦銀の収益体質に、みずほはなぜ全従業員の4分の1にあたる約1.9万人と店舗2割の削減で応えたのか",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "minori-system-2019",
      "url": "/tse/8411/decisions/minori-system-2019/",
      "api_url": "/api/8411/decisions/minori-system-2019.json",
      "year": 2019,
      "month": null,
      "type": "new_business",
      "tags": [
        "bm-digital",
        "st-capex"
      ],
      "title": "新勘定系システムMINORIへの全面刷新——4000億円台半ば・35万人月の勘定系統合",
      "subtitle": "二度のシステム障害を招いた3行併存の勘定系に、みずほはなぜ4000億円台半ばを投じて全面刷新を選んだのか",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "system-failures-2021",
      "url": "/tse/8411/decisions/system-failures-2021/",
      "api_url": "/api/8411/decisions/system-failures-2021.json",
      "year": 2021,
      "month": 11,
      "type": "misconduct",
      "tags": [
        "tr-scandal",
        "gv-succession",
        "gv-board"
      ],
      "title": "度重なるシステム障害と行政処分——経営責任とガバナンス改革への転換",
      "subtitle": "稼働間もない統合勘定系が起こした計8回の障害に、みずほの経営はどう責任を取り、何を作り替えようとしたのか",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "rakuten-securities-2022",
      "url": "/tse/8411/decisions/rakuten-securities-2022/",
      "api_url": "/api/8411/decisions/rakuten-securities-2022.json",
      "year": 2022,
      "month": 10,
      "type": "alliance",
      "tags": [
        "cp-crossholding",
        "bm-channel"
      ],
      "title": "楽天証券への出資と資本業務提携——対面のみずほ、ネットの楽天",
      "subtitle": "メガバンクの証券会社が、なぜ競い合うネット証券最大手級へ800億円を投じ、二段構えで出資を49%まで高めたのか",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "greenhill-acquisition-2023",
      "url": "/tse/8411/decisions/greenhill-acquisition-2023/",
      "api_url": "/api/8411/decisions/greenhill-acquisition-2023.json",
      "year": 2023,
      "month": 5,
      "type": "acquisition",
      "tags": [
        "ma-crossborder-out",
        "pf-vertical"
      ],
      "title": "米グリーンヒル買収——M&A助言機能の「内製化」",
      "subtitle": "債券引受で米国に食い込んだみずほは、なぜ栄光の薄れた老舗ブティックへ5.5億ドルを投じ、M&A助言の看板ごと買ったのか",
      "status": "implemented",
      "status_label": "実施"
    }
  ],
  "by_type": [
    {
      "key": "acquisition",
      "count": 1,
      "url": "/api/8411/decisions/by-type/acquisition.json"
    },
    {
      "key": "alliance",
      "count": 1,
      "url": "/api/8411/decisions/by-type/alliance.json"
    },
    {
      "key": "merger",
      "count": 1,
      "url": "/api/8411/decisions/by-type/merger.json"
    },
    {
      "key": "misconduct",
      "count": 1,
      "url": "/api/8411/decisions/by-type/misconduct.json"
    },
    {
      "key": "new_business",
      "count": 1,
      "url": "/api/8411/decisions/by-type/new_business.json"
    },
    {
      "key": "reorganization",
      "count": 1,
      "url": "/api/8411/decisions/by-type/reorganization.json"
    },
    {
      "key": "restructuring",
      "count": 1,
      "url": "/api/8411/decisions/by-type/restructuring.json"
    }
  ],
  "by_decade": [
    {
      "key": "2000s",
      "count": 1,
      "url": "/api/8411/decisions/by-decade/2000s.json"
    },
    {
      "key": "2010s",
      "count": 3,
      "url": "/api/8411/decisions/by-decade/2010s.json"
    },
    {
      "key": "2020s",
      "count": 3,
      "url": "/api/8411/decisions/by-decade/2020s.json"
    }
  ]
}