{
  "timeline": [
    {
      "date": "1909/6",
      "category": "会社設立",
      "region": "",
      "importance": 3,
      "event": "京成電気軌道を設立",
      "detail": "資本金150万円。1909年6月創立総会",
      "significance": "東京（押上）と成田を結ぶ電気鉄道を目指して設立。社名は「東京」と「成田」に由来",
      "source": "有価証券報告書",
      "amount": "資本金150万円"
    },
    {
      "date": "1912/11",
      "category": "設備投資",
      "region": "",
      "importance": 3,
      "event": "押上〜市川間、曲金〜柴又間で電車開通",
      "detail": "京成電気軌道の最初の開業区間",
      "significance": "成田方面への路線建設の第一歩",
      "source": "有価証券報告書"
    },
    {
      "date": "1921/7",
      "category": "設備投資",
      "region": "",
      "importance": 2,
      "event": "船橋〜千葉間開通",
      "detail": "",
      "significance": "千葉県の県庁所在地への路線が完成",
      "source": "有価証券報告書"
    },
    {
      "date": "1926/12",
      "category": "設備投資",
      "region": "",
      "importance": 2,
      "event": "津田沼〜成田花咲町間開通",
      "detail": "",
      "significance": "成田方面への路線が大きく延伸",
      "source": "有価証券報告書"
    },
    {
      "date": "1930/4",
      "category": "設備投資",
      "region": "",
      "importance": 3,
      "event": "成田花咲町〜成田間開通",
      "detail": "",
      "significance": "押上〜成田間が全通し、社名の由来である東京と成田の結節が実現した",
      "source": "有価証券報告書"
    },
    {
      "date": "1931/12",
      "category": "設備投資",
      "region": "",
      "importance": 2,
      "event": "青砥〜日暮里間開通",
      "detail": "",
      "significance": "日暮里方面への路線延伸で都心アクセスが向上",
      "source": "有価証券報告書"
    },
    {
      "date": "1933/12",
      "category": "設備投資",
      "region": "",
      "importance": 3,
      "event": "日暮里〜上野公園間開通",
      "detail": "",
      "significance": "京成上野駅の開業により、都心ターミナルを獲得した",
      "source": "有価証券報告書"
    },
    {
      "date": "1945/6",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "商号を京成電鉄に変更",
      "detail": "京成電気軌道から京成電鉄へ",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1949/5",
      "category": "株式上場",
      "region": "",
      "importance": 2,
      "event": "東京証券取引所に上場",
      "detail": "",
      "significance": "戦後の資本市場への参加",
      "source": "有価証券報告書"
    },
    {
      "date": "1960/12",
      "category": "設備投資",
      "region": "",
      "importance": 3,
      "event": "都営地下鉄1号線（浅草線）と相互乗り入れ運転開始",
      "detail": "",
      "significance": "都営浅草線経由で品川・横浜方面へのアクセスが実現。京急との直通運転の基盤となった",
      "source": "有価証券報告書"
    },
    {
      "date": "1972/5",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "北総開発鉄道を設立",
      "detail": "",
      "significance": "千葉ニュータウンへのアクセス路線を担う子会社。後に成田スカイアクセスの基盤となる",
      "source": "有価証券報告書"
    },
    {
      "date": "1978/5",
      "category": "設備投資",
      "region": "",
      "importance": 4,
      "event": "京成成田〜成田空港間開通、スカイライナー運転開始",
      "detail": "空港特急「スカイライナー」の運行開始",
      "significance": "成田空港へのアクセス鉄道として京成の事業構造を根本的に変えた。空港輸送が京成の収益の柱となる起点",
      "source": "有価証券報告書"
    },
    {
      "date": "1991/3",
      "category": "設備投資",
      "region": "",
      "importance": 3,
      "event": "成田空港ターミナル地下駅乗り入れ開始",
      "detail": "成田市駒井野分岐点〜成田空港間開通",
      "significance": "空港ターミナル直下への乗り入れにより利便性が飛躍的に向上",
      "source": "有価証券報告書"
    },
    {
      "date": "1998/10",
      "category": "企業買収",
      "region": "",
      "importance": 1,
      "event": "千葉急行電鉄の営業譲受",
      "detail": "千葉中央〜ちはら台間",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2003/10",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "バス事業を京成バスに営業譲渡",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2009/3",
      "category": "企業買収",
      "region": "",
      "importance": 1,
      "event": "帝都自動車交通を連結子会社化",
      "detail": "株式追加取得",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2010/7",
      "category": "設備投資",
      "region": "",
      "importance": 4,
      "event": "成田空港線（成田スカイアクセス）開業",
      "detail": "北総線経由で日暮里〜成田空港間を最速36分で結ぶ新線",
      "significance": "従来の京成本線経由（約70分）に対し、所要時間を半分以下に短縮。スカイライナーの高速化により空港アクセスの競争力が飛躍的に向上",
      "source": "有価証券報告書"
    },
    {
      "date": "2011/6",
      "category": "社長交代",
      "region": "",
      "importance": 2,
      "event": "三枝紀生が代表取締役社長に就任",
      "detail": "花田力から交代",
      "significance": "成田スカイアクセス開業後の体制固めを担う",
      "source": "有価証券報告書"
    },
    {
      "date": "2017/6",
      "category": "社長交代",
      "region": "",
      "importance": 2,
      "event": "小林敏也が代表取締役社長に就任",
      "detail": "三枝紀生から交代",
      "significance": "訪日客増加への対応を推進する社長交代",
      "source": "有価証券報告書"
    },
    {
      "date": "2019/10",
      "category": "企業買収",
      "region": "",
      "importance": 2,
      "event": "関東鉄道を連結子会社化",
      "detail": "株式追加取得",
      "significance": "茨城県でのバス・鉄道事業基盤を強化",
      "source": "有価証券報告書"
    },
    {
      "date": "2021/3",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "純損失を計上",
      "detail": "COVID-19の影響で鉄道旅客収入・空港利用者が激減",
      "significance": "空港アクセス収入への依存度の高さが裏目に出た",
      "source": "有価証券報告書",
      "amount": "純損失▲303億円"
    },
    {
      "date": "2022/9",
      "category": "企業買収",
      "region": "",
      "importance": 2,
      "event": "新京成電鉄を連結子会社化",
      "detail": "株式追加取得",
      "significance": "千葉県内の鉄道ネットワーク統合の一環",
      "source": "有価証券報告書"
    },
    {
      "date": "2025/3",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "連結営業収益3,193億円・純利益700億円",
      "detail": "",
      "significance": "OLC持分法投資利益を含む過去最高益圏",
      "source": "有価証券報告書",
      "amount": "連結営業収益3,193億円"
    },
    {
      "date": "2025/4",
      "category": "組織再編",
      "region": "",
      "importance": 2,
      "event": "新京成電鉄を吸収合併",
      "detail": "京成電鉄を存続会社とする吸収合併",
      "significance": "グループ内鉄道事業の一体化",
      "source": "有価証券報告書"
    },
    {
      "date": "2025/6",
      "category": "社長交代",
      "region": "",
      "importance": 2,
      "event": "天野貴夫が代表取締役社長に就任",
      "detail": "小林敏也から交代",
      "significance": "",
      "source": "有価証券報告書"
    }
  ]
}