{
  "spec_version": "3",
  "endpoint": "decisions",
  "stock_code": "8267",
  "company_name": "イオン",
  "content_lang": "ja",
  "meta_lang": "en",
  "canonical_url": "https://the-shashi.com/tse/8267/",
  "api_url": "/api/8267/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/8267/",
  "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-1758",
      "url": "/tse/8267/decisions/founding-1758/",
      "api_url": "/api/8267/decisions/founding-1758.json",
      "year": 1758,
      "month": null,
      "type": "founding",
      "title": "イオン創業——伊勢街道の呉服商「篠原屋」から連邦経営のジャスコへ",
      "subtitle": "1758年に岡田惣左衛門氏が伊勢街道の四日市で暖簾分けした呉服太物商は、家訓「大黒柱に車をつけよ」を受け継ぎながらどう総合小売の連邦へ姿を変えたか",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "jusco-merger-1970",
      "url": "/tse/8267/decisions/jusco-merger-1970/",
      "api_url": "/api/8267/decisions/jusco-merger-1970.json",
      "year": 1970,
      "month": 3,
      "type": "reorganization",
      "tags": [
        "ma-merger"
      ],
      "title": "5社の対等合併によるジャスコ発足と「連邦経営」の設計",
      "subtitle": "大手の吸収合併とは異なる道を、地方の中堅スーパー5社はどう設計したか——対等合併と「連邦経営」でジャスコを発足させた判断",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "mega-sc-developer-1995",
      "url": "/tse/8267/decisions/mega-sc-developer-1995/",
      "api_url": "/api/8267/decisions/mega-sc-developer-1995.json",
      "year": 1995,
      "month": 8,
      "type": "new_business",
      "tags": [
        "bm-model-shift",
        "pf-diversify-related"
      ],
      "title": "郊外大型ショッピングセンターの本格展開とデベロッパー事業への多角化",
      "subtitle": "店を売る商売から、場を貸す商売へ——大店法緩和のなか、ジャスコは成長の主力をどこに置いたのか",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "marunaka-acquisition-2011",
      "url": "/tse/8267/decisions/marunaka-acquisition-2011/",
      "api_url": "/api/8267/decisions/marunaka-acquisition-2011.json",
      "year": 2011,
      "month": 10,
      "type": "acquisition",
      "tags": [
        "ma-rollup",
        "pf-diversify-related"
      ],
      "title": "中四国トップの食品スーパー、マルナカ・山陽マルナカの子会社化",
      "subtitle": "連邦経営を掲げてきたイオンが、なぜ約450億円で創業家から株式のほぼ全てを買い取ったか",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "daiei-acquisition-2013",
      "url": "/tse/8267/decisions/daiei-acquisition-2013/",
      "api_url": "/api/8267/decisions/daiei-acquisition-2013.json",
      "year": 2013,
      "month": null,
      "type": "acquisition",
      "tags": [
        "ma-rescue",
        "cp-delisting",
        "pf-focus"
      ],
      "title": "イオンによるダイエーの完全子会社化と流通の世代交代",
      "subtitle": "「流通革命」の雄をどう引き取るか——救済型M&Aがもたらした、ダイエーからイオンへの主役交代",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "fuji-subsidiary-2021",
      "url": "/tse/8267/decisions/fuji-subsidiary-2021/",
      "api_url": "/api/8267/decisions/fuji-subsidiary-2021.json",
      "year": 2021,
      "month": 9,
      "type": "acquisition",
      "tags": [
        "cp-holdings"
      ],
      "title": "中四国最大手フジの共同持株会社化による実質子会社化と地域スーパー再編",
      "subtitle": "上場を残したまま地元最大手をどう束ねるか——共同持株会社を経てフジをイオンの連結子会社にした判断",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "daiei-split-2026",
      "url": "/tse/8267/decisions/daiei-split-2026/",
      "api_url": "/api/8267/decisions/daiei-split-2026.json",
      "year": 2026,
      "month": null,
      "type": "reorganization",
      "tags": [
        "cp-holdings",
        "tr-restructuring",
        "pf-focus"
      ],
      "title": "ダイエーの東西2分割と食品スーパーの再編",
      "subtitle": "完全子会社化から10年、赤字の名門をどう作り替えるか——首都圏と近畿へ分けたイオンの再編",
      "status": "implemented",
      "status_label": "実施"
    }
  ],
  "by_type": [
    {
      "key": "acquisition",
      "count": 3,
      "url": "/api/8267/decisions/by-type/acquisition.json"
    },
    {
      "key": "founding",
      "count": 1,
      "url": "/api/8267/decisions/by-type/founding.json"
    },
    {
      "key": "new_business",
      "count": 1,
      "url": "/api/8267/decisions/by-type/new_business.json"
    },
    {
      "key": "reorganization",
      "count": 2,
      "url": "/api/8267/decisions/by-type/reorganization.json"
    }
  ],
  "by_decade": [
    {
      "key": "1750s",
      "count": 1,
      "url": "/api/8267/decisions/by-decade/1750s.json"
    },
    {
      "key": "1970s",
      "count": 1,
      "url": "/api/8267/decisions/by-decade/1970s.json"
    },
    {
      "key": "1990s",
      "count": 1,
      "url": "/api/8267/decisions/by-decade/1990s.json"
    },
    {
      "key": "2010s",
      "count": 2,
      "url": "/api/8267/decisions/by-decade/2010s.json"
    },
    {
      "key": "2020s",
      "count": 2,
      "url": "/api/8267/decisions/by-decade/2020s.json"
    }
  ]
}