{
  "spec_version": "3",
  "endpoint": "decisions",
  "stock_code": "5423",
  "company_name": "東京製鐵",
  "content_lang": "ja",
  "meta_lang": "en",
  "canonical_url": "https://the-shashi.com/tse/5423/",
  "api_url": "/api/5423/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/5423/",
  "count": 3,
  "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": "daimaru-merger-1971",
      "url": "/tse/5423/decisions/daimaru-merger-1971/",
      "api_url": "/api/5423/decisions/daimaru-merger-1971.json",
      "year": 1971,
      "month": 9,
      "type": "acquisition",
      "tags": [
        "ma-merger",
        "st-capex"
      ],
      "title": "全株式を取得していた大丸製鋼の吸収合併と九州工場の開設",
      "subtitle": "市況の底で拠点を買うか、待つか——電炉4極の生産網をどう組み上げたか",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "open-hearth-exit-1978",
      "url": "/tse/5423/decisions/open-hearth-exit-1978/",
      "api_url": "/api/5423/decisions/open-hearth-exit-1978.json",
      "year": 1978,
      "month": null,
      "type": "restructuring",
      "tags": [
        "tr-restructuring",
        "st-capex",
        "pf-focus"
      ],
      "title": "岡山工場の平炉停止と江戸川工場閉鎖による電炉一貫体制への移行",
      "subtitle": "3期連続赤字の年に220億円を投じるか——平炉を捨て、拠点をどこまで削るか",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "hot-coil-entry-1991",
      "url": "/tse/5423/decisions/hot-coil-entry-1991/",
      "api_url": "/api/5423/decisions/hot-coil-entry-1991.json",
      "year": 1991,
      "month": 10,
      "type": "new_business",
      "tags": [
        "pf-diversify-related",
        "st-capex",
        "st-tech"
      ],
      "title": "高炉独占品種だった熱延広幅帯鋼への電炉メーカーとしての量産参入",
      "subtitle": "H形鋼の次をどこに置くか——700億円を投じた薄板進出",
      "status": "implemented",
      "status_label": "実施"
    }
  ],
  "by_type": [
    {
      "key": "acquisition",
      "count": 1,
      "url": "/api/5423/decisions/by-type/acquisition.json"
    },
    {
      "key": "new_business",
      "count": 1,
      "url": "/api/5423/decisions/by-type/new_business.json"
    },
    {
      "key": "restructuring",
      "count": 1,
      "url": "/api/5423/decisions/by-type/restructuring.json"
    }
  ],
  "by_decade": [
    {
      "key": "1970s",
      "count": 2,
      "url": "/api/5423/decisions/by-decade/1970s.json"
    },
    {
      "key": "1990s",
      "count": 1,
      "url": "/api/5423/decisions/by-decade/1990s.json"
    }
  ]
}