{
  "timeline": [
    {
      "date": "1954/12",
      "category": "会社設立",
      "region": "",
      "importance": 4,
      "event": "佐藤研一郎が東洋電具製作所を創業",
      "detail": "京都市上京区で炭素皮膜固定抵抗器の開発・販売を開始",
      "significance": "京都発の電子部品メーカーの原点。抵抗器から半導体へ至る70年の起点",
      "source": "有価証券報告書"
    },
    {
      "date": "1958/9",
      "category": "組織再編",
      "region": "",
      "importance": 2,
      "event": "株式会社東洋電具製作所を設立",
      "detail": "資本金2000千円",
      "significance": "法人化により事業基盤を確立",
      "source": "有価証券報告書",
      "amount": "資本金200万円"
    },
    {
      "date": "1959/9",
      "category": "設備投資",
      "region": "",
      "importance": 1,
      "event": "西大路工場を建設",
      "detail": "",
      "significance": "有価証券報告書",
      "source": ""
    },
    {
      "date": "1961/9",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "本社を京都市右京区に移転",
      "detail": "",
      "significance": "有価証券報告書",
      "source": ""
    },
    {
      "date": "1966/8",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "ワコー電器（現ローム・ワコー）を岡山県に設立",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1969/3",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "ICの開発・販売を開始",
      "detail": "",
      "significance": "抵抗器メーカーから半導体メーカーへの転換点",
      "source": "有価証券報告書"
    },
    {
      "date": "1970/8",
      "category": "",
      "region": "米州",
      "importance": 2,
      "event": "米国にROHM CORPORATION設立",
      "detail": "",
      "significance": "初の海外拠点。以後世界各地に開発・製造・販売拠点を設置",
      "source": "有価証券報告書"
    },
    {
      "date": "1970/10",
      "category": "設備投資",
      "region": "",
      "importance": 2,
      "event": "本社敷地内に半導体製造ラインを設置",
      "detail": "",
      "significance": "自社一貫生産体制の確立。垂直統合モデルの起点",
      "source": "有価証券報告書"
    },
    {
      "date": "1979/8",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "商標をR.ohmからROHMに変更",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1981/9",
      "category": "組織再編",
      "region": "",
      "importance": 2,
      "event": "商号をローム株式会社に変更",
      "detail": "",
      "significance": "半導体メーカーとしてのブランド確立",
      "source": "有価証券報告書"
    },
    {
      "date": "1982/6",
      "category": "設備投資",
      "region": "",
      "importance": 1,
      "event": "半導体研究センター開設",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1983/11",
      "category": "株式上場",
      "region": "",
      "importance": 2,
      "event": "大阪証券取引所市場第二部に上場",
      "detail": "",
      "significance": "資本市場へのアクセスを確保",
      "source": "有価証券報告書"
    },
    {
      "date": "1986/4",
      "category": "設備投資",
      "region": "",
      "importance": 1,
      "event": "研究開発センター（現LSI開発センター）開設",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1986/9",
      "category": "株式上場",
      "region": "",
      "importance": 2,
      "event": "大証第一部に指定",
      "detail": "",
      "significance": "上場から3年で一部昇格",
      "source": "有価証券報告書"
    },
    {
      "date": "1989/1",
      "category": "株式上場",
      "region": "",
      "importance": 2,
      "event": "東京証券取引所市場第一部に上場",
      "detail": "",
      "significance": "東西両市場での上場により流動性・知名度を向上",
      "source": "有価証券報告書"
    },
    {
      "date": "1989/8",
      "category": "設備投資",
      "region": "",
      "importance": 1,
      "event": "LSI研究センター開設",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1994/9",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "ISO9001認証取得",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1997/9",
      "category": "設備投資",
      "region": "",
      "importance": 1,
      "event": "横浜テクノロジーセンター開設",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1998/5",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "ISO14001認証取得",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1998/6",
      "category": "設備投資",
      "region": "",
      "importance": 1,
      "event": "VLSI研究センター開設",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "1999/7",
      "category": "設備投資",
      "region": "",
      "importance": 1,
      "event": "京都テクノロジーセンター開設",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2002/4",
      "category": "設備投資",
      "region": "",
      "importance": 1,
      "event": "オプティカルデバイス研究センター開設",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2003/1",
      "category": "設備投資",
      "region": "",
      "importance": 1,
      "event": "LSI計測技術センター開設",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2008/10",
      "category": "企業買収",
      "region": "",
      "importance": 3,
      "event": "沖電気工業から半導体事業部門を買収",
      "detail": "OKIセミコンダクタの全株式を取得",
      "significance": "パワーデバイスの生産能力を大幅に拡充。車載・産機向け強化の布石",
      "source": "有価証券報告書",
      "amount": "株式価値900億円"
    },
    {
      "date": "2009/6",
      "category": "社長交代",
      "region": "",
      "importance": 3,
      "event": "澤村諭が代表取締役社長に就任",
      "detail": "佐藤研一郎から交代",
      "significance": "創業者から経営を引き継ぎ。55年にわたる佐藤体制の終焉",
      "source": "有価証券報告書"
    },
    {
      "date": "2009/7",
      "category": "企業買収",
      "region": "欧州",
      "importance": 4,
      "event": "サイクリスタル社（現SiCrystal GmbH）を買収",
      "detail": "ドイツのSiCウェハメーカー。SiCウェハ製造の内製化",
      "significance": "SiCパワー半導体の垂直統合を実現。後のSiC事業拡大の基盤となる戦略的買収",
      "source": "有価証券報告書"
    },
    {
      "date": "2009/10",
      "category": "企業買収",
      "region": "",
      "importance": 2,
      "event": "米Kionix社を買収",
      "detail": "MEMS加速度センサのサプライヤーを完全子会社化",
      "significance": "MEMSセンサ事業への参入",
      "source": "IR"
    },
    {
      "date": "2010/4",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "SiC製ショットキーバリアダイオードを開発・販売開始",
      "detail": "",
      "significance": "SiCパワーデバイス市場への本格参入。サイクリスタル買収の成果が製品化",
      "source": "有価証券報告書"
    },
    {
      "date": "2011/3",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "初の純損失",
      "detail": "減損損失の計上が主因",
      "significance": "リーマン後の半導体不況と事業再編コストが重なり初の最終赤字",
      "source": "有価証券報告書",
      "amount": "純損失▲161億円"
    },
    {
      "date": "2011/11",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "OKIセミコンダクタののれん減損損失を計上",
      "detail": "",
      "significance": "買収時ののれんを全額減損処理",
      "source": "IR",
      "amount": "減損損失86億円"
    },
    {
      "date": "2012/2",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "タイ洪水災害に関する特別損失を計上",
      "detail": "タイ工場の浸水被害",
      "significance": "グローバルサプライチェーンリスクが顕在化",
      "source": "IR",
      "amount": "特別損失100億円"
    },
    {
      "date": "2012/3",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "初の営業赤字",
      "detail": "FY12通期",
      "significance": "タイ洪水・円高・LED事業不振の三重苦で創業以来初の営業赤字",
      "source": "有価証券報告書",
      "amount": "営業赤字▲9億円 / 純損失▲525億円"
    },
    {
      "date": "2013/1",
      "category": "構造改革",
      "region": "",
      "importance": 2,
      "event": "希望退職者の募集結果を発表",
      "detail": "",
      "significance": "構造改革の一環として人員削減を実施",
      "source": "IR",
      "amount": "応募219名（募集250名）"
    },
    {
      "date": "2013/3",
      "category": "",
      "region": "",
      "importance": 1,
      "event": "OHSAS18001認証取得",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2017/6",
      "category": "社長交代",
      "region": "",
      "importance": 2,
      "event": "藤原忠信が代表取締役社長に就任",
      "detail": "澤村諭から交代",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2019/6",
      "category": "社長交代",
      "region": "",
      "importance": 2,
      "event": "松本功が代表取締役社長に就任",
      "detail": "藤原忠信から交代",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2019/12",
      "category": "企業買収",
      "region": "",
      "importance": 2,
      "event": "パナソニックから半導体デバイス事業の一部を譲受",
      "detail": "",
      "significance": "ダイオード・トランジスタ製品群を拡充",
      "source": "有価証券報告書"
    },
    {
      "date": "2021/5",
      "category": "経営計画",
      "region": "",
      "importance": 1,
      "event": "中期経営計画「MOVING FORWARD to 2025」を策定",
      "detail": "",
      "significance": "",
      "source": "IR"
    },
    {
      "date": "2022/3",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "タンタルコンデンサ事業を売却",
      "detail": "KAVX社に事業資産を譲渡",
      "significance": "",
      "source": "IR"
    },
    {
      "date": "2022/4",
      "category": "株式上場",
      "region": "",
      "importance": 1,
      "event": "東京証券取引所プライム市場に移行",
      "detail": "",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2023/5",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "株主提案に対する取締役会意見を公表",
      "detail": "",
      "significance": "",
      "source": "IR"
    },
    {
      "date": "2023/12",
      "category": "企業買収",
      "region": "",
      "importance": 3,
      "event": "東芝D&Sとのパワー半導体供給確保計画が経産省認定",
      "detail": "",
      "significance": "政府支援を受けたSiCパワー半導体の国内供給体制構築",
      "source": "IR",
      "amount": "事業総額3883億円（うちローム側2892億円） / 最大助成金1294億円"
    },
    {
      "date": "2024/3",
      "category": "業務提携",
      "region": "",
      "importance": 2,
      "event": "東芝半導体事業との業務提携強化に向けた協議開始を提案",
      "detail": "",
      "significance": "",
      "source": "IR"
    },
    {
      "date": "2024/6",
      "category": "社長交代",
      "region": "",
      "importance": 2,
      "event": "東克己が代表取締役社長に就任",
      "detail": "松本功から交代",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2024/9",
      "category": "企業買収",
      "region": "",
      "importance": 3,
      "event": "デンソーと半導体分野での戦略的パートナーシップ検討開始に合意",
      "detail": "",
      "significance": "車載半導体の安定供給に向けた大手Tier1との連携",
      "source": "IR"
    },
    {
      "date": "2025/3",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "営業赤字転落・純損失",
      "detail": "SiC関連の品質保証費用・評価減が主因",
      "significance": "SiC事業拡大の過程で大規模損失が発生。構造改革の契機に",
      "source": "有価証券報告書",
      "amount": "営業赤字▲400億円 / 純損失▲500億円"
    },
    {
      "date": "2025/5",
      "category": "業務提携",
      "region": "",
      "importance": 3,
      "event": "デンソーと戦略的パートナーシップ構築で基本合意",
      "detail": "デンソーがローム株式を取得予定",
      "significance": "車載パワー半導体分野での資本提携。経営の安定化と事業シナジーを狙う",
      "source": "IR"
    },
    {
      "date": "2025/11",
      "category": "経営計画",
      "region": "",
      "importance": 1,
      "event": "第2期中計「MOVING FORWARD to 2028」を策定",
      "detail": "",
      "significance": "",
      "source": "IR"
    }
  ]
}