{
  "spec_version": "3",
  "endpoint": "decisions",
  "stock_code": "1801",
  "company_name": "大成建設",
  "content_lang": "ja",
  "meta_lang": "en",
  "canonical_url": "https://the-shashi.com/tse/1801/",
  "api_url": "/api/1801/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/1801/",
  "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": "founding-1873",
      "url": "/tse/1801/decisions/founding-1873/",
      "api_url": "/api/1801/decisions/founding-1873.json",
      "year": 1873,
      "month": 10,
      "type": "founding",
      "title": "大成建設創業——大倉喜八郎氏の大倉組商会から業界初「建設」社名の採用へ",
      "subtitle": "文明開化期の輸入貿易と政府発注の建設工事を両輪に、35歳・大倉喜八郎氏が起こした大倉組商会はどう業界初の株式会社と「建設」社名へ至ったか",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "zaibatsu-dissolution-1946",
      "url": "/tse/1801/decisions/zaibatsu-dissolution-1946/",
      "api_url": "/api/1801/decisions/zaibatsu-dissolution-1946.json",
      "year": 1946,
      "month": 1,
      "type": "capital",
      "tags": [
        "gv-family"
      ],
      "title": "財閥解体と「大成建設」への改称——社員の会社としての再建",
      "subtitle": "大倉財閥の解体で常務以上が公職追放となるなか、大倉土木を母体とする建設会社はなぜ大倉家の全株を社員へ移し、業界で初めて「建設」を社名に掲げたのか",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "collegial-management-1965",
      "url": "/tse/1801/decisions/collegial-management-1965/",
      "api_url": "/api/1801/decisions/collegial-management-1965.json",
      "year": 1965,
      "month": 1,
      "type": "governance",
      "tags": [
        "gv-board"
      ],
      "title": "「集大成」の合議経営と本部制への移行",
      "subtitle": "創業家のワンマン支配が消えた戦後の大成建設で、本間嘉平社長はなぜ経営方針を常務会に諮り、社長を議長に徹する集団指導体制を選んだのか",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "taisei-kensetsu-decentralization-reform-1988",
      "url": "/tse/1801/decisions/taisei-kensetsu-decentralization-reform-1988/",
      "api_url": "/api/1801/decisions/taisei-kensetsu-decentralization-reform-1988.json",
      "year": 1988,
      "month": null,
      "type": "transformation",
      "tags": [
        "gv-board",
        "bm-model-shift"
      ],
      "title": "分権主義の軌道修正と「請負業からの脱皮」への組織改革",
      "subtitle": "戦後いち早く同族色を捨てた「組織の大成」は、低成長と市場成熟にどう組織を作り替えたか",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "linear-bid-rigging-2018",
      "url": "/tse/1801/decisions/linear-bid-rigging-2018/",
      "api_url": "/api/1801/decisions/linear-bid-rigging-2018.json",
      "year": 2018,
      "month": 3,
      "type": "misconduct",
      "tags": [
        "tr-scandal",
        "gv-board"
      ],
      "title": "リニア談合事件での起訴と「談合ではない」とする否認・徹底抗戦",
      "subtitle": "スーパーゼネコンの一角は、なぜ受注調整を認めながら談合を否定し、大林組・清水建設と袂を分かって公判で争う道を選んだのか",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "ps-mitsubishi-acquisition-2023",
      "url": "/tse/1801/decisions/ps-mitsubishi-acquisition-2023/",
      "api_url": "/api/1801/decisions/ps-mitsubishi-acquisition-2023.json",
      "year": 2023,
      "month": 11,
      "type": "acquisition",
      "tags": [
        "pf-vertical",
        "ma-rollup",
        "ma-pmi"
      ],
      "title": "ピーエス三菱のTOB買収と垂直統合M&Aの始動",
      "subtitle": "スーパーゼネコンの一角は、なぜPC橋専業のピーエス三菱を子会社化し、連続買収の口火を切ったのか",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "toyo-construction-acquisition-2025",
      "url": "/tse/1801/decisions/toyo-construction-acquisition-2025/",
      "api_url": "/api/1801/decisions/toyo-construction-acquisition-2025.json",
      "year": 2025,
      "month": 8,
      "type": "acquisition",
      "title": "海洋土木大手・東洋建設のTOBによる買収と完全子会社化",
      "subtitle": "スーパーゼネコンはなぜマリコンを取り込むのか——洋上風力と海洋工事をめぐる過去最大のゼネコン再編",
      "status": "implemented",
      "status_label": "実施"
    }
  ],
  "by_type": [
    {
      "key": "acquisition",
      "count": 2,
      "url": "/api/1801/decisions/by-type/acquisition.json"
    },
    {
      "key": "capital",
      "count": 1,
      "url": "/api/1801/decisions/by-type/capital.json"
    },
    {
      "key": "founding",
      "count": 1,
      "url": "/api/1801/decisions/by-type/founding.json"
    },
    {
      "key": "governance",
      "count": 1,
      "url": "/api/1801/decisions/by-type/governance.json"
    },
    {
      "key": "misconduct",
      "count": 1,
      "url": "/api/1801/decisions/by-type/misconduct.json"
    },
    {
      "key": "transformation",
      "count": 1,
      "url": "/api/1801/decisions/by-type/transformation.json"
    }
  ],
  "by_decade": [
    {
      "key": "1870s",
      "count": 1,
      "url": "/api/1801/decisions/by-decade/1870s.json"
    },
    {
      "key": "1940s",
      "count": 1,
      "url": "/api/1801/decisions/by-decade/1940s.json"
    },
    {
      "key": "1960s",
      "count": 1,
      "url": "/api/1801/decisions/by-decade/1960s.json"
    },
    {
      "key": "1980s",
      "count": 1,
      "url": "/api/1801/decisions/by-decade/1980s.json"
    },
    {
      "key": "2010s",
      "count": 1,
      "url": "/api/1801/decisions/by-decade/2010s.json"
    },
    {
      "key": "2020s",
      "count": 2,
      "url": "/api/1801/decisions/by-decade/2020s.json"
    }
  ]
}