{
  "spec_version": "3",
  "endpoint": "decisions",
  "stock_code": "4503",
  "company_name": "アステラス製薬",
  "content_lang": "ja",
  "meta_lang": "en",
  "canonical_url": "https://the-shashi.com/tse/4503/",
  "api_url": "/api/4503/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/4503/",
  "count": 2,
  "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": "astellas-formation-2005",
      "url": "/tse/4503/decisions/astellas-formation-2005/",
      "api_url": "/api/4503/decisions/astellas-formation-2005.json",
      "year": 2005,
      "month": null,
      "type": "merger",
      "tags": [
        "ma-merger"
      ],
      "title": "山之内製薬と藤沢薬品工業の合併によるアステラス製薬の誕生（2005年成立）",
      "subtitle": "国内3位と5位の合併はなぜ「社名一新の対等合併」として演出され、何をもたらしたのか？",
      "status": "completed",
      "status_label": "成立"
    },
    {
      "slug": "osi-hostile-tob-2010",
      "url": "/tse/4503/decisions/osi-hostile-tob-2010/",
      "api_url": "/api/4503/decisions/osi-hostile-tob-2010.json",
      "year": 2010,
      "month": 3,
      "type": "acquisition",
      "tags": [
        "ma-hostile",
        "ma-crossborder-out"
      ],
      "title": "米OSIファーマシューティカルズへの同意なき買収（敵対的TOB）",
      "subtitle": "主力薬の特許切れが迫るなか、アステラスはなぜ拒まれてもなお米がん企業を買いにいったのか",
      "status": "implemented",
      "status_label": "実施"
    }
  ],
  "by_type": [
    {
      "key": "acquisition",
      "count": 1,
      "url": "/api/4503/decisions/by-type/acquisition.json"
    },
    {
      "key": "merger",
      "count": 1,
      "url": "/api/4503/decisions/by-type/merger.json"
    }
  ],
  "by_decade": [
    {
      "key": "2000s",
      "count": 1,
      "url": "/api/4503/decisions/by-decade/2000s.json"
    },
    {
      "key": "2010s",
      "count": 1,
      "url": "/api/4503/decisions/by-decade/2010s.json"
    }
  ]
}