{
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  "endpoint": "timeline",
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  "company_name": "テレビ朝日ホールディングス",
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  "updated": "2026-08-14",
  "license": "© 2026 Yutaka Sugiura. All rights reserved.",
  "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/9409/",
  "source": {
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      "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",
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      "event": "教育専門局として予備免許を取得",
      "source": "有価証券報告書"
    },
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      "importance": 2,
      "event": "日本教育テレビを設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1958/11",
      "importance": 1,
      "event": "本社を六本木に移転",
      "source": "有価証券報告書"
    },
    {
      "date": "1959/1",
      "importance": 1,
      "event": "JOEX-TV局の本免許を取得",
      "source": "有価証券報告書"
    },
    {
      "date": "1959/2",
      "importance": 3,
      "event": "教育専門局として開局",
      "source": "有価証券報告書"
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    {
      "date": "1960/1",
      "importance": 1,
      "event": "映像出力を50kWに増力",
      "source": "有価証券報告書"
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    {
      "date": "1960/12",
      "importance": 1,
      "event": "社名の略称をNETテレビに統一",
      "source": "有価証券報告書"
    },
    {
      "date": "1961/4",
      "importance": 1,
      "event": "早朝放送を開始し全日放送を確立",
      "source": "有価証券報告書"
    },
    {
      "date": "1967/4",
      "importance": 2,
      "event": "カラー放送を開始",
      "source": "有価証券報告書"
    },
    {
      "date": "1970/4",
      "importance": 1,
      "event": "エヌ・イー・ティー音楽出版を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "1971/10",
      "importance": 1,
      "event": "朝日テレビニュース社を関連会社化",
      "source": "有価証券報告書"
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      "source": "有価証券報告書"
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      "event": "社名を全国朝日放送に変更し略称をテレビ朝日に統一",
      "source": "有価証券報告書"
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      "date": "1978/12",
      "importance": 1,
      "event": "音声多重放送を開始",
      "source": "有価証券報告書"
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    {
      "date": "1985/9",
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      "event": "アーク放送センターからの放送を開始",
      "source": "有価証券報告書"
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      "date": "1986/3",
      "importance": 1,
      "event": "テレビ朝日文字放送を開始",
      "source": "有価証券報告書"
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      "date": "2000/10",
      "importance": 1,
      "event": "東京証券取引所市場第一部に株式を上場",
      "source": "有価証券報告書"
    },
    {
      "date": "2003/7",
      "importance": 1,
      "event": "本社を六本木の新社屋に移転",
      "source": "有価証券報告書"
    },
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      "date": "2003/10",
      "importance": 2,
      "event": "社名をテレビ朝日に変更",
      "source": "有価証券報告書"
    },
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      "date": "2003/12",
      "importance": 2,
      "event": "地上デジタル放送を開始",
      "source": "有価証券報告書"
    },
    {
      "date": "2006/4",
      "importance": 1,
      "event": "デジタル・キャスト・インターナショナルを設立",
      "source": "有価証券報告書"
    },
    {
      "date": "2008/3",
      "importance": 1,
      "event": "フレックスと日本ケーブルテレビジョンを連結子会社化",
      "source": "有価証券報告書"
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    {
      "date": "2009/4",
      "importance": 1,
      "event": "シンエイ動画を連結子会社化",
      "source": "有価証券報告書"
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    {
      "date": "2011/7",
      "importance": 2,
      "event": "地上アナログ放送を終了し地上デジタル放送に完全移行",
      "source": "有価証券報告書"
    },
    {
      "date": "2013/10",
      "importance": 1,
      "event": "テレビ朝日分割準備会社を設立",
      "source": "有価証券報告書"
    },
    {
      "date": "2014/4",
      "importance": 3,
      "event": "認定放送持株会社体制に移行しテレビ朝日ホールディングスに商号を変更",
      "source": "有価証券報告書"
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    {
      "date": "2014/4",
      "importance": 1,
      "event": "ビーエス朝日を関連会社から連結子会社化",
      "source": "有価証券報告書"
    },
    {
      "date": "2015/6",
      "importance": 1,
      "event": "監査等委員会設置会社に移行",
      "source": "有価証券報告書"
    },
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      "date": "2016/7",
      "importance": 1,
      "event": "AbemaProductionを設立",
      "source": "有価証券報告書"
    },
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      "date": "2022/4",
      "importance": 1,
      "event": "東京証券取引所プライム市場に移行",
      "source": "有価証券報告書"
    },
    {
      "date": "2026/3",
      "importance": 2,
      "event": "複合型エンタテインメント施設「東京ドリームパーク」を開業",
      "source": "有価証券報告書"
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}