{
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  "endpoint": "timeline",
  "stock_code": "6460",
  "company_name": "セガサミーホールディングス",
  "content_lang": "ja",
  "meta_lang": "en",
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  "updated": "2026-09-06",
  "license": "© 2026 Yutaka Sugiura. All rights reserved.",
  "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/6460/",
  "source": {
    "primary": [
      "有価証券報告書"
    ],
    "extraction": "有価証券報告書の沿革を基礎に、社史・報道で補完",
    "row_field": "source"
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  "timeline": [
    {
      "date": "2001/1",
      "importance": 3,
      "event": "セガが家庭用ゲーム機ハード事業から撤退（ドリームキャスト製造中止）",
      "source": null,
      "link": "/tse/6460/decisions/hardware-exit-2001/"
    },
    {
      "date": "2004/5",
      "importance": 3,
      "event": "セガとサミーが株式移転で持株会社設立を決議",
      "source": "有価証券報告書",
      "link": "/tse/6460/decisions/sega-integration-2004/"
    },
    {
      "date": "2004/6",
      "importance": 1,
      "event": "両社株主総会で株式移転を承認",
      "source": "有価証券報告書"
    },
    {
      "date": "2004/10",
      "importance": 2,
      "event": "セガサミーHD設立・東京証券取引所一部上場",
      "source": "有価証券報告書"
    },
    {
      "date": "2005/10",
      "importance": 1,
      "event": "トムス・エンタテインメントを子会社化",
      "source": "有価証券報告書"
    },
    {
      "date": "2007/3",
      "importance": 1,
      "event": "タイヨーエレックを持分法適用関連会社化",
      "source": "有価証券報告書"
    },
    {
      "date": "2007/12",
      "importance": 1,
      "event": "タイヨーエレックを子会社化",
      "source": "有価証券報告書"
    },
    {
      "date": "2010/12",
      "importance": 1,
      "event": "セガ系3社を株式交換で完全子会社化",
      "source": "有価証券報告書"
    },
    {
      "date": "2012/3",
      "importance": 1,
      "event": "フェニックスリゾートを子会社化",
      "source": "有価証券報告書"
    },
    {
      "date": "2012/7",
      "importance": 3,
      "event": "カジノIRの合弁会社を設立",
      "source": "有価証券報告書",
      "link": "/tse/6460/decisions/resort-ir-investment-2012/"
    },
    {
      "date": "2013/6",
      "importance": 1,
      "event": "セガサミークリエイションを設立",
      "source": "有価証券報告書"
    },
    {
      "date": "2013/11",
      "importance": 2,
      "event": "インデックスの事業を譲受",
      "source": "有価証券報告書"
    },
    {
      "date": "2014/11",
      "importance": 2,
      "event": "パラダイスシティの建設に着工",
      "source": "有価証券報告書"
    },
    {
      "date": "2015/4",
      "importance": 3,
      "event": "セガを機能別3社に分割",
      "source": "有価証券報告書",
      "link": "/tse/6460/decisions/sega-restructuring-2015/"
    },
    {
      "date": "2017/1",
      "importance": 1,
      "event": "セガ・ライブクリエイションを連結子会社から除外",
      "source": "有価証券報告書"
    },
    {
      "date": "2017/4",
      "importance": 1,
      "event": "パラダイスシティを開業",
      "source": "有価証券報告書"
    },
    {
      "date": "2017/12",
      "importance": 1,
      "event": "ゲーミング機器ライセンス取得",
      "source": "有価証券報告書"
    },
    {
      "date": "2020/4",
      "importance": 1,
      "event": "セガゲームスがセガに商号変更しグループ再編",
      "source": "有価証券報告書"
    },
    {
      "date": "2020/12",
      "importance": 2,
      "event": "セガ エンタテインメントを連結子会社から除外",
      "source": "有価証券報告書"
    },
    {
      "date": "2021/3",
      "importance": 2,
      "event": "Sega Amusements Internationalを売却",
      "source": "有価証券報告書"
    },
    {
      "date": "2021/4",
      "importance": 1,
      "event": "セガがセガグループを吸収合併",
      "source": "有価証券報告書"
    },
    {
      "date": "2022/6",
      "importance": 1,
      "event": "監査等委員会設置会社へ移行",
      "source": "有価証券報告書"
    },
    {
      "date": "2023/8",
      "importance": 2,
      "event": "Rovio Entertainmentを買収",
      "source": "有価証券報告書"
    },
    {
      "date": "2024/5",
      "importance": 1,
      "event": "フェニックスリゾートを連結子会社から除外",
      "source": "有価証券報告書"
    }
  ]
}