{
  "timeline": [
    {
      "date": "1974/6",
      "category": "会社設立",
      "region": "",
      "importance": 5,
      "event": "大東産業を資本金100万円で設立",
      "detail": "名古屋市千種区猪高町に大東産業株式会社として創業",
      "significance": "大東建託の起点。建設業界に名古屋発の新興プレーヤーとして参入",
      "source": "有価証券報告書",
      "amount": "資本金100万円"
    },
    {
      "date": "1978/9",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "商号を大東建設に変更",
      "detail": "大東産業から大東建設へ社名変更",
      "significance": "建設業への業態明確化",
      "source": "有価証券報告書"
    },
    {
      "date": "1980/3",
      "category": "新規事業",
      "region": "",
      "importance": 1,
      "event": "大東共済会を設立",
      "detail": "共済事業に参入",
      "significance": "周辺事業の立ち上げ",
      "source": "有価証券報告書"
    },
    {
      "date": "1988/4",
      "category": "",
      "region": "",
      "importance": 4,
      "event": "商号を大東建託に変更",
      "detail": "大東建設から大東建託へ社名変更",
      "significance": "「建設+受託」モデルへの軸足転換を示す社名変更",
      "source": "有価証券報告書"
    },
    {
      "date": "1989/3",
      "category": "株式上場",
      "region": "",
      "importance": 3,
      "event": "名古屋証券取引所市場第二部に上場",
      "detail": "名証二部上場",
      "significance": "公開資本市場へのアクセス獲得",
      "source": "有価証券報告書"
    },
    {
      "date": "1990/4",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "本社機構を東京都品川区へ移転",
      "detail": "品川区北品川へ本社移転",
      "significance": "東京進出の第一歩",
      "source": "有価証券報告書"
    },
    {
      "date": "1991/9",
      "category": "株式上場",
      "region": "",
      "importance": 2,
      "event": "名古屋証券取引所第一部に指定替え",
      "detail": "名証一部指定替え",
      "significance": "二部上場から2年半での昇格",
      "source": "有価証券報告書"
    },
    {
      "date": "1992/2",
      "category": "株式上場",
      "region": "",
      "importance": 4,
      "event": "東京証券取引所市場第一部に上場",
      "detail": "東証一部上場",
      "significance": "東証一部上場で資本市場での認知拡大",
      "source": "有価証券報告書"
    },
    {
      "date": "1993/10",
      "category": "新規事業",
      "region": "",
      "importance": 2,
      "event": "大東ファイナンスを設立",
      "detail": "金融事業へ進出",
      "significance": "賃貸経営オーナー向けファイナンス機能の内製化",
      "source": "有価証券報告書",
      "amount": "全額出資"
    },
    {
      "date": "1994/7",
      "category": "新規事業",
      "region": "",
      "importance": 2,
      "event": "ハウスコムを設立",
      "detail": "賃貸仲介事業へ進出",
      "significance": "賃貸物件の客付け機能を自前で持つ垂直統合の起点",
      "source": "有価証券報告書",
      "amount": "全額出資"
    },
    {
      "date": "1995/10",
      "category": "新規事業",
      "region": "",
      "importance": 1,
      "event": "全額出資の販売子会社10社を設立",
      "detail": "販売子会社10社設立",
      "significance": "営業網の子会社化による全国展開",
      "source": "有価証券報告書"
    },
    {
      "date": "1996/9",
      "category": "海外進出",
      "region": "東南アジア",
      "importance": 2,
      "event": "マレーシアでホテル開発事業に着手",
      "detail": "DAITO ASIA INVESTMENT/DEVELOPMENT を設立",
      "significance": "海外不動産事業への進出",
      "source": "有価証券報告書"
    },
    {
      "date": "1996/9",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "本社機構を東京都港区芝公園へ移転",
      "detail": "芝公園二丁目へ本社移転",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1997/2",
      "category": "設備投資",
      "region": "",
      "importance": 1,
      "event": "本社用地を品川駅東口再開発地区に取得",
      "detail": "品川駅東口の本社用地取得",
      "significance": "後の品川イーストワンタワー建設の布石",
      "source": "有価証券報告書"
    },
    {
      "date": "1997/4",
      "category": "企業買収",
      "region": "",
      "importance": 1,
      "event": "小林建設を取得し大東スチールに",
      "detail": "小林建設の全株式取得",
      "significance": "建設関連の周辺機能取り込み",
      "source": "有価証券報告書"
    },
    {
      "date": "1998/10",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "販売子会社10社を吸収合併",
      "detail": "販売子会社10社を吸収合併",
      "significance": "1995年に立ち上げた販売子会社網の本体再吸収",
      "source": "有価証券報告書"
    },
    {
      "date": "1999/2",
      "category": "新規事業",
      "region": "",
      "importance": 2,
      "event": "在宅介護事業へ進出",
      "detail": "大東ロジテムをケアパートナーに改称し介護事業開始",
      "significance": "介護分野への多角化",
      "source": "有価証券報告書"
    },
    {
      "date": "1999/9",
      "category": "新規事業",
      "region": "",
      "importance": 2,
      "event": "賃貸建物管理業務を開始",
      "detail": "品川ビルサービスを大東建物管理に改称し賃貸建物管理開始",
      "significance": "管理機能の内製化(後の大東建託パートナーズ)",
      "source": "有価証券報告書"
    },
    {
      "date": "2000/10",
      "category": "新規事業",
      "region": "",
      "importance": 2,
      "event": "「タクセルホーム」のブランドで戸建て住宅事業へ参入",
      "detail": "戸建住宅事業へ参入",
      "significance": "賃貸建設から戸建分野への進出",
      "source": "有価証券報告書"
    },
    {
      "date": "2001/6",
      "category": "新規事業",
      "region": "",
      "importance": 2,
      "event": "プロパンガス供給事業へ進出",
      "detail": "ガスパル関東・ガスパル中部を設立",
      "significance": "賃貸物件向け生活インフラ事業の立ち上げ",
      "source": "有価証券報告書"
    },
    {
      "date": "2002/6",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "ガスパル4社を設立",
      "detail": "ガスパル近畿・中国・九州を設立",
      "significance": "プロパンガス事業の地域別展開",
      "source": "有価証券報告書"
    },
    {
      "date": "2002/8",
      "category": "企業買収|新規事業",
      "region": "",
      "importance": 2,
      "event": "日本電建から営業の一部を譲り受け戸建住宅事業を推進",
      "detail": "新日本電建を設立し戸建住宅事業推進",
      "significance": "戸建住宅事業の本格化",
      "source": "有価証券報告書"
    },
    {
      "date": "2003/3",
      "category": "設備投資",
      "region": "",
      "importance": 2,
      "event": "品川イーストワンタワー竣工",
      "detail": "賃貸複合ビル「品川イーストワンタワー」竣工",
      "significance": "自社開発の旗艦物件竣工",
      "source": "有価証券報告書"
    },
    {
      "date": "2003/4",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "本社機構を品川イーストワンタワーへ移転",
      "detail": "品川区港南二丁目へ本社移転",
      "significance": "自社開発ビルへの本社集約",
      "source": "有価証券報告書"
    },
    {
      "date": "2004/1",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "ハウスコム関連の再編",
      "detail": "ハウスコムと関西ハウスコムを統合再編",
      "significance": "賃貸仲介子会社の整理",
      "source": "有価証券報告書"
    },
    {
      "date": "2004/4",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "大東住託と大東建設を合併",
      "detail": "大東住託として営業開始",
      "significance": "グループ内建設事業の集約",
      "source": "有価証券報告書"
    },
    {
      "date": "2004/10",
      "category": "設備投資",
      "region": "東南アジア",
      "importance": 2,
      "event": "マレーシアでホテル開業",
      "detail": "ル・メリディアン・クアラルンプール開業",
      "significance": "海外ホテル事業の初の運営開始",
      "source": "有価証券報告書"
    },
    {
      "date": "2004/12",
      "category": "新規事業",
      "region": "",
      "importance": 1,
      "event": "D.T.C. REINSURANCE LIMITEDを設立",
      "detail": "再保険事業に進出",
      "significance": "グループ内リスク移転機能の内製化",
      "source": "有価証券報告書"
    },
    {
      "date": "2005/7",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "ガスパル5社を本体に合併",
      "detail": "ガスパル地域子会社を本体に合併",
      "significance": "プロパンガス事業の運営体制集約",
      "source": "有価証券報告書"
    },
    {
      "date": "2007/9",
      "category": "新規事業",
      "region": "",
      "importance": 2,
      "event": "連帯保証人不要サービスを開始",
      "detail": "ハウスリーブを設立",
      "significance": "賃貸入居審査の家賃保証への置換",
      "source": "有価証券報告書"
    },
    {
      "date": "2008/4",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "大東共済会を大東建物管理に合併",
      "detail": "大東共済会を大東建物管理に合併",
      "significance": "管理子会社への共済機能統合",
      "source": "有価証券報告書"
    },
    {
      "date": "2011/6",
      "category": "株式上場|親子上場",
      "region": "",
      "importance": 2,
      "event": "ハウスコムが大証JASDAQに上場",
      "detail": "連結子会社ハウスコムが上場",
      "significance": "子会社単独上場で親子上場体制成立",
      "source": "有価証券報告書"
    },
    {
      "date": "2014/4",
      "category": "新規事業",
      "region": "",
      "importance": 2,
      "event": "大東みらい信託と少額短期保険を設立",
      "detail": "大東みらい信託・ハウスガード設立",
      "significance": "信託・保険機能の内製化",
      "source": "有価証券報告書"
    },
    {
      "date": "2014/8",
      "category": "新規事業",
      "region": "",
      "importance": 1,
      "event": "大東エナジーを設立",
      "detail": "大東エナジー設立",
      "significance": "電力事業準備",
      "source": "有価証券報告書"
    },
    {
      "date": "2015/6",
      "category": "海外進出",
      "region": "米州",
      "importance": 2,
      "event": "米国不動産開発事業に進出",
      "detail": "CRS BLVDの出資持分取得",
      "significance": "米国市場への進出開始",
      "source": "有価証券報告書"
    },
    {
      "date": "2015/12",
      "category": "業務提携",
      "region": "",
      "importance": 2,
      "event": "ソラストと資本業務提携",
      "detail": "介護大手ソラストと資本業務提携(現・持分法適用関連会社)",
      "significance": "介護領域の外部連携強化",
      "source": "有価証券報告書"
    },
    {
      "date": "2016/1",
      "category": "海外進出",
      "region": "米州",
      "importance": 1,
      "event": "DAITO KENTAKU USA設立",
      "detail": "米国子会社設立",
      "significance": "米国不動産事業の運営主体設立",
      "source": "有価証券報告書"
    },
    {
      "date": "2016/11",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "大東建託リーシングを設立",
      "detail": "賃貸仲介機能の専業子会社設立",
      "significance": "グループ機能分業の進展",
      "source": "有価証券報告書"
    },
    {
      "date": "2017/4",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "大東建物管理を大東建託パートナーズに改称",
      "detail": "管理子会社を大東建託パートナーズに改称",
      "significance": "グループブランド統一",
      "source": "有価証券報告書"
    },
    {
      "date": "2017/5",
      "category": "組織再編",
      "region": "",
      "importance": 2,
      "event": "グループ主要3社体制を始動",
      "detail": "大東建託・大東建託パートナーズ・大東建託リーシングを主要3社と位置付け",
      "significance": "賃貸建設・管理・仲介の3軸体制を明示",
      "source": "有価証券報告書"
    },
    {
      "date": "2017/11",
      "category": "海外進出|企業買収",
      "region": "東南アジア",
      "importance": 2,
      "event": "マレーシアでヒルトン・クアラルンプール所有会社を取得",
      "detail": "DAISHO ASIA DEVELOPMENT (M) SDN.BHD.全株式取得",
      "significance": "2軒目の海外ホテル取得",
      "source": "有価証券報告書"
    },
    {
      "date": "2018/12",
      "category": "企業買収",
      "region": "",
      "importance": 1,
      "event": "さくらケア・うめケアを取得",
      "detail": "介護事業の周辺取得",
      "significance": "介護事業の規模拡大",
      "source": "有価証券報告書"
    },
    {
      "date": "2019/6",
      "category": "株式上場|親子上場",
      "region": "",
      "importance": 1,
      "event": "ハウスコムが東証二部へ市場変更",
      "detail": "ハウスコム東証二部上場",
      "significance": "子会社の市場格上げ",
      "source": "有価証券報告書"
    },
    {
      "date": "2019/7",
      "category": "企業買収",
      "region": "",
      "importance": 1,
      "event": "エスケイビル建材を取得",
      "detail": "ハウスコムの建材子会社化",
      "significance": "賃貸子会社系列の周辺強化",
      "source": "有価証券報告書"
    },
    {
      "date": "2019/8",
      "category": "海外進出",
      "region": "中国",
      "importance": 2,
      "event": "良部屋商務咨詢(上海)を設立",
      "detail": "中国市場への進出",
      "significance": "中国賃貸事業の運営主体設立",
      "source": "有価証券報告書"
    },
    {
      "date": "2019/8",
      "category": "株式上場|親子上場",
      "region": "",
      "importance": 1,
      "event": "ハウスコムが東証一部へ市場変更",
      "detail": "ハウスコム東証一部上場",
      "significance": "二部上場の翌々月の一部昇格",
      "source": "有価証券報告書"
    },
    {
      "date": "2019/12",
      "category": "合弁設立|新規事業",
      "region": "",
      "importance": 2,
      "event": "JustCo DK Japanを設立",
      "detail": "フレキシブル・ワークスペース事業の合弁会社設立",
      "significance": "コワーキングへの参入",
      "source": "有価証券報告書"
    },
    {
      "date": "2020/11",
      "category": "企業買収",
      "region": "",
      "importance": 2,
      "event": "インヴァランス全株式取得",
      "detail": "投資用不動産販売のインヴァランスを子会社化",
      "significance": "投資用マンション事業への進出",
      "source": "有価証券報告書"
    },
    {
      "date": "2021/3",
      "category": "企業買収",
      "region": "",
      "importance": 1,
      "event": "ハウスコムが宅都を取得",
      "detail": "大阪ハウスコム化",
      "significance": "関西の仲介ネットワーク強化",
      "source": "有価証券報告書"
    },
    {
      "date": "2022/4",
      "category": "株式上場",
      "region": "",
      "importance": 1,
      "event": "東証プライム・名証プレミアへ移行",
      "detail": "市場再編に伴うプライム市場移行",
      "significance": "東証市場再編に伴う区分変更",
      "source": "有価証券報告書"
    },
    {
      "date": "2022/9",
      "category": "企業買収",
      "region": "",
      "importance": 2,
      "event": "ライジング・フォースを取得",
      "detail": "大東建託アセットソリューションとして子会社化",
      "significance": "アセットマネジメント機能の取り込み",
      "source": "有価証券報告書"
    },
    {
      "date": "2023/2",
      "category": "企業買収",
      "region": "",
      "importance": 1,
      "event": "絆ケアを取得",
      "detail": "ケアパートナーが絆ケアを子会社化",
      "significance": "介護事業の地域拡大",
      "source": "有価証券報告書"
    },
    {
      "date": "2023/2",
      "category": "企業買収",
      "region": "",
      "importance": 1,
      "event": "セイルボートを取得",
      "detail": "大東建託パートナーズがセイルボートを子会社化",
      "significance": "管理子会社の周辺取得",
      "source": "有価証券報告書"
    },
    {
      "date": "2023/6",
      "category": "企業買収",
      "region": "",
      "importance": 1,
      "event": "ハウスコムがシーアールエヌを完全子会社化",
      "detail": "ハウスコムが100%子会社化",
      "significance": "仲介周辺の取り込み",
      "source": "有価証券報告書"
    },
    {
      "date": "2023/9",
      "category": "新規事業|海外進出",
      "region": "米州",
      "importance": 2,
      "event": "大東バイオエナジーとDAITO CANADA TRADINGを設立",
      "detail": "バイオエネルギー事業とカナダ進出",
      "significance": "北米拠点と再エネ事業の同時立ち上げ",
      "source": "有価証券報告書"
    },
    {
      "date": "2023/11",
      "category": "企業買収",
      "region": "",
      "importance": 2,
      "event": "シマ全株式取得",
      "detail": "シマを子会社化",
      "significance": "介護事業の地域拡大",
      "source": "有価証券報告書"
    },
    {
      "date": "2024/1",
      "category": "企業買収|海外進出",
      "region": "米州",
      "importance": 2,
      "event": "STASIA CAPITAL MANAGEMENT を取得",
      "detail": "DK Realty Management America として子会社化",
      "significance": "米国不動産アセット運用機能の取り込み",
      "source": "有価証券報告書"
    },
    {
      "date": "2024/7",
      "category": "海外進出",
      "region": "米州",
      "importance": 1,
      "event": "Amethyst Investment",
      "detail": " LLCを設立",
      "significance": "",
      "source": "米国不動産事業の追加運営主体",
      "amount": "米国子会社設立"
    },
    {
      "date": "2025/2",
      "category": "企業買収|親子上場",
      "region": "",
      "importance": 3,
      "event": "ハウスコム完全子会社化",
      "detail": "親子上場解消によりハウスコムを完全子会社化",
      "significance": "2011年以来の親子上場関係を解消",
      "source": "有価証券報告書"
    },
    {
      "date": "2025/3",
      "category": "企業買収",
      "region": "",
      "importance": 2,
      "event": "アスコット96.03%取得",
      "detail": "投資用不動産のアスコットを子会社化",
      "significance": "投資用不動産事業の規模拡大",
      "source": "有価証券報告書"
    }
  ]
}