{
  "spec_version": "3",
  "endpoint": "decisions",
  "stock_code": "4188",
  "company_name": "三菱ケミカルグループ",
  "content_lang": "ja",
  "meta_lang": "en",
  "canonical_url": "https://the-shashi.com/tse/4188/",
  "api_url": "/api/4188/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/4188/",
  "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": "mitsubishi-chemical-1994",
      "url": "/tse/4188/decisions/mitsubishi-chemical-1994/",
      "api_url": "/api/4188/decisions/mitsubishi-chemical-1994.json",
      "year": 1994,
      "month": null,
      "type": "merger",
      "tags": [
        "ma-merger"
      ],
      "title": "三菱化成と三菱油化の合併・三菱化学の発足（1994年成立）",
      "subtitle": "石炭化学の三菱化成と石油化学の三菱油化はなぜ一つになり、総合化学最大手として何を追ったのか？",
      "status": "completed",
      "status_label": "成立"
    },
    {
      "slug": "profit-first-restructuring-1999",
      "url": "/tse/4188/decisions/profit-first-restructuring-1999/",
      "api_url": "/api/4188/decisions/profit-first-restructuring-1999.json",
      "year": 1999,
      "month": 2,
      "type": "restructuring",
      "tags": [
        "tr-restructuring",
        "bm-core-shift",
        "pf-focus"
      ],
      "title": "赤字事業の撲滅と四日市エチレン停止による「脱・総合」への転換",
      "subtitle": "総合化学最大手の看板を守るか、利益を取るか——三浦昭社長はなぜ四日市のエチレンを止めたか",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "mitsubishi-chemical-holdings-2005",
      "url": "/tse/4188/decisions/mitsubishi-chemical-holdings-2005/",
      "api_url": "/api/4188/decisions/mitsubishi-chemical-holdings-2005.json",
      "year": 2005,
      "month": null,
      "type": "merger",
      "tags": [
        "ma-merger",
        "cp-holdings"
      ],
      "title": "三菱化学と三菱ウェルファーマの共同株式移転・三菱ケミカルホールディングス設立（2005年成立）",
      "subtitle": "石化の市況変動に揺れる総合化学は、なぜ化学と医薬を持株会社で束ね、KAITEKI経営へと向かったのか？",
      "status": "completed",
      "status_label": "成立"
    },
    {
      "slug": "mitsubishi-plastics-share-exchange-2007",
      "url": "/tse/4188/decisions/mitsubishi-plastics-share-exchange-2007/",
      "api_url": "/api/4188/decisions/mitsubishi-plastics-share-exchange-2007.json",
      "year": 2007,
      "month": 3,
      "type": "acquisition",
      "tags": [
        "cp-delisting",
        "cp-holdings",
        "st-premium"
      ],
      "title": "三菱樹脂の株式交換による完全子会社化と機能商品の持株会社直下への集約",
      "subtitle": "石化の傘下にあった機能商品を、なぜ公開買付け・現物配当・株式交換の3段を踏んで持株会社の直下へ移したのか",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "mitsubishi-rayon-acquisition-2009",
      "url": "/tse/4188/decisions/mitsubishi-rayon-acquisition-2009/",
      "api_url": "/api/4188/decisions/mitsubishi-rayon-acquisition-2009.json",
      "year": 2009,
      "month": 11,
      "type": "acquisition",
      "tags": [
        "pf-vertical",
        "ma-rollup",
        "st-premium"
      ],
      "title": "三菱レイヨンの公開買付けによる子会社化（総額約2100億円）",
      "subtitle": "小林喜光社長は「世界シェア1位」を掲げ、脱・総合化学のなかでなぜ約2100億円の買収に踏み切ったか",
      "status": "implemented",
      "status_label": "実施"
    },
    {
      "slug": "mitsubishi-chemical-integration-2017",
      "url": "/tse/4188/decisions/mitsubishi-chemical-integration-2017/",
      "api_url": "/api/4188/decisions/mitsubishi-chemical-integration-2017.json",
      "year": 2017,
      "month": null,
      "type": "merger",
      "tags": [
        "ma-merger",
        "ma-pmi"
      ],
      "title": "三菱化学・三菱樹脂・三菱レイヨンの統合・三菱ケミカル発足（2017年成立）",
      "subtitle": "持株会社の発足から12年を経て化学系3社を1社に束ねた統合は、なぜ「器先行・中身後追い」と呼ばれたのか？",
      "status": "completed",
      "status_label": "成立"
    },
    {
      "slug": "tanabe-mitsubishi-tob-2019",
      "url": "/tse/4188/decisions/tanabe-mitsubishi-tob-2019/",
      "api_url": "/api/4188/decisions/tanabe-mitsubishi-tob-2019.json",
      "year": 2019,
      "month": 11,
      "type": "acquisition",
      "tags": [
        "cp-delisting"
      ],
      "title": "田辺三菱製薬の完全子会社化（4918億円TOB）と親子上場の解消",
      "subtitle": "不振の上場子会社を巨額買収で取り込むか——越智仁社長はなぜ発表前株価の5割増しで買い付けたか",
      "status": "implemented",
      "status_label": "実施"
    }
  ],
  "by_type": [
    {
      "key": "acquisition",
      "count": 3,
      "url": "/api/4188/decisions/by-type/acquisition.json"
    },
    {
      "key": "merger",
      "count": 3,
      "url": "/api/4188/decisions/by-type/merger.json"
    },
    {
      "key": "restructuring",
      "count": 1,
      "url": "/api/4188/decisions/by-type/restructuring.json"
    }
  ],
  "by_decade": [
    {
      "key": "1990s",
      "count": 2,
      "url": "/api/4188/decisions/by-decade/1990s.json"
    },
    {
      "key": "2000s",
      "count": 3,
      "url": "/api/4188/decisions/by-decade/2000s.json"
    },
    {
      "key": "2010s",
      "count": 2,
      "url": "/api/4188/decisions/by-decade/2010s.json"
    }
  ]
}