{
  "timeline": [
    {
      "date": "1878/5",
      "category": "会社設立",
      "region": "",
      "importance": 3,
      "event": "東京株式取引所設立免許",
      "detail": "東京証券取引所の前身",
      "significance": "日本近代資本市場の出発点",
      "source": "有価証券報告書"
    },
    {
      "date": "1878/6",
      "category": "会社設立",
      "region": "",
      "importance": 2,
      "event": "大阪株式取引所設立免許",
      "detail": "大阪証券取引所の前身",
      "significance": "大阪の近代資本市場の起点",
      "source": "有価証券報告書"
    },
    {
      "date": "1949/4",
      "category": "組織再編",
      "region": "",
      "importance": 3,
      "event": "会員組織として東京・大阪証券取引所が設立",
      "detail": "戦後のGHQ指導下での取引所再開",
      "significance": "戦後日本の資本市場を制度として再起動",
      "source": "有価証券報告書"
    },
    {
      "date": "1949/5",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "株券の売買を開始",
      "detail": "",
      "significance": "戦後の株式流通再開",
      "source": "有価証券報告書"
    },
    {
      "date": "1956/4",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "債券市場を開設",
      "detail": "東京・大阪両取引所",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1961/10",
      "category": "組織再編",
      "region": "",
      "importance": 2,
      "event": "市場第二部制度を導入",
      "detail": "東京・大阪両取引所",
      "significance": "中堅企業の上場受け皿となる二部市場の創設",
      "source": "有価証券報告書"
    },
    {
      "date": "1966/10",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "東証、国債市場を開設",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1969/7",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "東証株価指数（TOPIX）算出開始",
      "detail": "",
      "significance": "以後数十年にわたり日本株市場の代表的指数として定着",
      "source": "有価証券報告書"
    },
    {
      "date": "1985/10",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "東証、国債先物市場を開設",
      "detail": "",
      "significance": "日本における金融デリバティブ市場の本格的幕開け",
      "source": "有価証券報告書"
    },
    {
      "date": "1988/9",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "株価指数先物市場を開設",
      "detail": "東京・大阪両取引所",
      "significance": "日経225先物・TOPIX先物の誕生",
      "source": "有価証券報告書"
    },
    {
      "date": "1989/6",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "大証、株価指数オプション市場を開設",
      "detail": "日経225オプション",
      "significance": "大証のデリバティブ特化への布石",
      "source": "有価証券報告書"
    },
    {
      "date": "1998/7",
      "category": "設備投資",
      "region": "",
      "importance": 1,
      "event": "東証、TDnet稼働",
      "detail": "適時開示情報伝達システム",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1999/4",
      "category": "組織再編",
      "region": "",
      "importance": 2,
      "event": "東証、株券売買立会場を閉場",
      "detail": "電子化に伴う象徴的出来事",
      "significance": "取引所の完全電子化",
      "source": "有価証券報告書"
    },
    {
      "date": "1999/7",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "大証、立会場廃止",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1999/11",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "東証、新興企業向け市場「マザーズ」を開設",
      "detail": "",
      "significance": "新興企業の資金調達の場を国内取引所に直接設けた",
      "source": "有価証券報告書"
    },
    {
      "date": "2000/5",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "大証、ナスダック・ジャパン市場を開設",
      "detail": "",
      "significance": "米ナスダックとの連携による新興市場",
      "source": "有価証券報告書"
    },
    {
      "date": "2001/4",
      "category": "組織再編",
      "region": "",
      "importance": 3,
      "event": "大証、会員組織から株式会社に組織変更",
      "detail": "",
      "significance": "証券取引所の株式会社化の先行事例",
      "source": "有価証券報告書"
    },
    {
      "date": "2001/11",
      "category": "組織再編",
      "region": "",
      "importance": 3,
      "event": "東証、会員組織から株式会社に組織変更",
      "detail": "",
      "significance": "主要取引所の株式会社化完了",
      "source": "有価証券報告書"
    },
    {
      "date": "2002/7",
      "category": "組織再編",
      "region": "",
      "importance": 2,
      "event": "東証、日本証券クリアリング機構を設立",
      "detail": "",
      "significance": "清算機能の独立法人化",
      "source": "有価証券報告書"
    },
    {
      "date": "2007/8",
      "category": "組織再編",
      "region": "",
      "importance": 3,
      "event": "東京証券取引所グループ設立",
      "detail": "単独株式移転により設立",
      "significance": "上場に向けた持株会社体制を整備",
      "source": "有価証券報告書"
    },
    {
      "date": "2008/12",
      "category": "企業買収",
      "region": "",
      "importance": 3,
      "event": "大証、ジャスダック証券取引所株式76.1％取得",
      "detail": "",
      "significance": "新興市場再編の起点",
      "source": "有価証券報告書",
      "amount": "取得割合76.1％"
    },
    {
      "date": "2009/6",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "TOKYO AIM取引所業務開始",
      "detail": "東証Gとロンドン証券取引所の合弁",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2010/1",
      "category": "設備投資",
      "region": "",
      "importance": 3,
      "event": "東証、現物取引システム「arrowhead」稼働",
      "detail": "",
      "significance": "超高速化により海外主要取引所と競争可能な水準に到達",
      "source": "有価証券報告書"
    },
    {
      "date": "2010/4",
      "category": "組織再編",
      "region": "",
      "importance": 2,
      "event": "大証とジャスダック証券取引所が合併",
      "detail": "",
      "significance": "新興市場統合の完成",
      "source": "有価証券報告書"
    },
    {
      "date": "2012/8",
      "category": "企業買収",
      "region": "",
      "importance": 4,
      "event": "東証Gが大証株式を公開買付で取得",
      "detail": "所有割合66.7％",
      "significance": "東証・大証統合の実行着手",
      "source": "有価証券報告書",
      "amount": "取得割合66.7％"
    },
    {
      "date": "2013/1",
      "category": "組織再編",
      "region": "",
      "importance": 5,
      "event": "東証Gと大証が合併し日本取引所グループ発足",
      "detail": "存続会社は大証。商号変更と同時に東証一部上場",
      "significance": "国内2大取引所の経営統合により世界有数の取引所グループ誕生",
      "source": "有価証券報告書"
    },
    {
      "date": "2013/7",
      "category": "組織再編",
      "region": "",
      "importance": 3,
      "event": "大証の現物市場・清算・自主規制機能を東証・JSCCへ統合",
      "detail": "",
      "significance": "現物市場の一本化",
      "source": "有価証券報告書"
    },
    {
      "date": "2014/1",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "JPX日経インデックス400の算出・公表を開始",
      "detail": "ROE等を重視した新指数",
      "significance": "コーポレートガバナンス改革を指数の側から後押し",
      "source": "有価証券報告書"
    },
    {
      "date": "2014/3",
      "category": "組織再編",
      "region": "",
      "importance": 4,
      "event": "東証のデリバティブ市場を大証に統合",
      "detail": "大証は大阪取引所に商号変更",
      "significance": "現物は東証・デリバティブは大阪の機能分担完成",
      "source": "有価証券報告書"
    },
    {
      "date": "2015/6",
      "category": "社長交代",
      "region": "",
      "importance": 3,
      "event": "清田瞭がグループCEOに就任",
      "detail": "前職：大和証券グループ本社会長",
      "significance": "コーポレートガバナンス改革の顔役となる第2代CEO",
      "source": "有価証券報告書"
    },
    {
      "date": "2017/12",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "Sustainable Stock Exchanges Initiative参加",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2018/5",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "国債決済期間短縮（T+1化）",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2019/7",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "株式等決済期間短縮（T+2化）",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2019/10",
      "category": "企業買収",
      "region": "",
      "importance": 4,
      "event": "東京商品取引所の公開買付完了",
      "detail": "所有割合97.15％で子会社化。11月に完全子会社化",
      "significance": "証券・デリバティブ・コモディティの統合取引所化",
      "source": "有価証券報告書",
      "amount": "取得割合97.15％"
    },
    {
      "date": "2020/7",
      "category": "組織再編",
      "region": "",
      "importance": 3,
      "event": "東商取の貴金属先物等を大阪取引所へ移管",
      "detail": "JSCCと日本商品清算機構が合併",
      "significance": "コモディティ統合の実質的完了",
      "source": "有価証券報告書"
    },
    {
      "date": "2022/4",
      "category": "構造改革",
      "region": "",
      "importance": 5,
      "event": "東証の新市場区分開始",
      "detail": "プライム・スタンダード・グロース",
      "significance": "1961年以来の市場区分の抜本的見直し",
      "source": "有価証券報告書"
    },
    {
      "date": "2022/4",
      "category": "組織再編",
      "region": "",
      "importance": 3,
      "event": "JPX総研が業務開始",
      "detail": "グループのデータ・デジタル事業を集約",
      "significance": "指数・情報・データビジネスの成長ドライバー化",
      "source": "有価証券報告書"
    },
    {
      "date": "2023/2",
      "category": "企業買収",
      "region": "",
      "importance": 2,
      "event": "JPX総研がSCRIPTS Asiaを完全子会社化",
      "detail": "",
      "significance": "IR・議事録書き起こしサービスの取り込み",
      "source": "有価証券報告書"
    },
    {
      "date": "2023/6",
      "category": "社長交代",
      "region": "",
      "importance": 3,
      "event": "山道裕己がグループCEOに就任",
      "detail": "前職：大阪取引所社長",
      "significance": "第2ステージ（中計2027）の市場改革を担う第3代CEO",
      "source": "有価証券報告書"
    },
    {
      "date": "2024/10",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "東証社員のインサイダー取引規制違反疑いで監視委調査",
      "detail": "山道CEOが決算説明会で陳謝",
      "significance": "取引所自身のガバナンスが問われる事態",
      "source": "IR"
    },
    {
      "date": "2024/11",
      "category": "設備投資",
      "region": "",
      "importance": 2,
      "event": "東証、現物立会市場の取引時間延伸",
      "detail": "次期arrowhead稼働と同時",
      "significance": "取引機会拡大による市場の魅力化施策",
      "source": "有価証券報告書"
    },
    {
      "date": "2025/3",
      "category": "経営計画",
      "region": "",
      "importance": 3,
      "event": "中期経営計画2027発表",
      "detail": "ROE18％以上を単一の財務目標に設定。配当性向60％以上へ",
      "significance": "業績変動を資本政策で吸収する柔軟運用への転換",
      "source": "IR",
      "amount": "ROE18％以上、自社株買い3年600億円"
    },
    {
      "date": "2025/4",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "FY24（2025年3月期）当期利益610億円で2期連続過去最高",
      "detail": "売上収益1,622億円、営業利益901億円",
      "significance": "2024年度の株高と売買代金拡大を背景にした最高益",
      "source": "有価証券報告書",
      "amount": "売上1,622億円、当期利益610億円"
    }
  ]
}