{
  "timeline": [
    {
      "date": "1881/5",
      "category": "会社設立",
      "region": "",
      "importance": 3,
      "event": "小野田セメント設立",
      "detail": "山口県小野田にて笠井順八らが設立。太平洋セメントの源流の一つ",
      "significance": "日本初の民間セメント会社として西日本のセメント産業を牽引",
      "source": "有価証券報告書"
    },
    {
      "date": "1883/4",
      "category": "会社設立",
      "region": "",
      "importance": 3,
      "event": "官営深川工作分局を借り受け（浅野セメント/日本セメントの源流）",
      "detail": "初代浅野総一郎が大蔵省創設の摂綿篤製造所を借り受けセメント製造を開始。翌年渋沢栄一と共同で匿名組合・浅野工場を発足",
      "significance": "日本のセメント産業における民間創業の起点。後の日本セメントの始まり",
      "source": "",
      "amount": "生産能力800樽（約145トン）"
    },
    {
      "date": "1903/12",
      "category": "設備投資",
      "region": "",
      "importance": 2,
      "event": "日本初の回転窯によるセメント製造を開始",
      "detail": "深川工場にアメリカから回転窯を輸入し据え付け",
      "significance": "近代的セメント製造技術の日本への導入",
      "source": ""
    },
    {
      "date": "1912/10",
      "category": "組織再編",
      "region": "",
      "importance": 2,
      "event": "浅野セメント株式会社設立",
      "detail": "資本金500万円",
      "significance": "浅野家主宰の株式会社としての新発足",
      "source": "",
      "amount": "資本金500万円"
    },
    {
      "date": "1915/7",
      "category": "組織再編",
      "region": "",
      "importance": 2,
      "event": "北海道セメントを合併し現上磯工場を取得",
      "detail": "",
      "significance": "北海道地盤の獲得",
      "source": "有価証券報告書"
    },
    {
      "date": "1923/1",
      "category": "会社設立",
      "region": "",
      "importance": 3,
      "event": "秩父セメント株式会社設立",
      "detail": "太平洋セメントの源流の一つ",
      "significance": "後の秩父小野田セメント合併に至る源流",
      "source": "有価証券報告書"
    },
    {
      "date": "1924/6",
      "category": "組織再編",
      "region": "",
      "importance": 2,
      "event": "木津川セメントを合併",
      "detail": "",
      "significance": "関西地盤強化と生産能力の飛躍",
      "source": "",
      "amount": "年産170万トンを突破"
    },
    {
      "date": "1929/5",
      "category": "設備投資",
      "region": "",
      "importance": 2,
      "event": "西多摩工場新設、早強セメント製造開始",
      "detail": "",
      "significance": "特殊セメント分野への進出",
      "source": ""
    },
    {
      "date": "1932/12",
      "category": "設備投資",
      "region": "",
      "importance": 1,
      "event": "藤原工場完成",
      "detail": "",
      "significance": "三重県藤原への生産拠点拡大",
      "source": "有価証券報告書"
    },
    {
      "date": "1934/1",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "日本初の低熱セメントの製造を開始",
      "detail": "西多摩工場にて",
      "significance": "大型土木工事向け特殊セメントの国産化",
      "source": ""
    },
    {
      "date": "1938/7",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "合併により津久見工場（現大分工場）を取得",
      "detail": "",
      "significance": "九州地盤の強化",
      "source": "有価証券報告書"
    },
    {
      "date": "1939/10",
      "category": "組織再編",
      "region": "",
      "importance": 2,
      "event": "旧日本セメントを合併",
      "detail": "八代・佐伯両工場を加える",
      "significance": "戦時下の業界再編による拠点拡大",
      "source": ""
    },
    {
      "date": "1942/4",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "合併により現大船渡工場取得",
      "detail": "東亜セメントを合併",
      "significance": "東北地盤の獲得",
      "source": "有価証券報告書"
    },
    {
      "date": "1947/5",
      "category": "組織再編",
      "region": "",
      "importance": 3,
      "event": "日本セメント株式会社に社名変更",
      "detail": "GHQの第二次財閥解体命令により浅野家主宰から離脱",
      "significance": "戦後63年にわたる浅野家支配の終焉と民主的再出発",
      "source": ""
    },
    {
      "date": "1949/5",
      "category": "株式上場",
      "region": "",
      "importance": 2,
      "event": "株式上場",
      "detail": "",
      "significance": "戦後の証券市場再開に伴う上場",
      "source": "有価証券報告書"
    },
    {
      "date": "1955/4",
      "category": "設備投資",
      "region": "",
      "importance": 1,
      "event": "埼玉工場完成",
      "detail": "高度経済成長期の需要対応",
      "significance": "首都圏需要の取り込み",
      "source": "有価証券報告書"
    },
    {
      "date": "1962/7",
      "category": "設備投資",
      "region": "",
      "importance": 1,
      "event": "熊谷工場完成",
      "detail": "",
      "significance": "関東内陸部の生産拠点拡大",
      "source": "有価証券報告書"
    },
    {
      "date": "1972/2",
      "category": "企業買収",
      "region": "",
      "importance": 1,
      "event": "明星セメント株式会社の全株式取得",
      "detail": "",
      "significance": "系列化による販売網強化",
      "source": "有価証券報告書"
    },
    {
      "date": "1983/3",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "創立100周年、中央研究所新築",
      "detail": "大幅な組織改正を断行",
      "significance": "研究開発体制の刷新",
      "source": ""
    },
    {
      "date": "1984/8",
      "category": "組織再編",
      "region": "",
      "importance": 2,
      "event": "大日本セメント共同事業株を設立",
      "detail": "大阪セメント等と共同。産業構造改善臨時措置法の適用を受け共同販売・物流合理化・過剰設備廃棄を実施",
      "significance": "オイルショック後の過剰設備問題に対する業界共同対応",
      "source": ""
    },
    {
      "date": "1990/10",
      "category": "企業買収",
      "region": "米州",
      "importance": 3,
      "event": "米カリフォルニア・ポルトランド・セメント（現カルポルトランド）を買収",
      "detail": "",
      "significance": "米国市場への本格進出。のちの収益柱",
      "source": "有価証券報告書"
    },
    {
      "date": "1994/10",
      "category": "組織再編",
      "region": "",
      "importance": 3,
      "event": "小野田セメントと秩父セメントが合併し秩父小野田株式会社発足",
      "detail": "本社を東京都港区西新橋",
      "significance": "業界再編の第一段階。太平洋セメント発足への序章",
      "source": "有価証券報告書"
    },
    {
      "date": "1995/4",
      "category": "企業買収",
      "region": "東南アジア",
      "importance": 2,
      "event": "ベトナムにギソンセメントコーポレーションを設立",
      "detail": "",
      "significance": "東南アジア進出の足場",
      "source": "有価証券報告書"
    },
    {
      "date": "1998/10",
      "category": "組織再編",
      "region": "",
      "importance": 4,
      "event": "秩父小野田と日本セメントが合併し太平洋セメント株式会社発足",
      "detail": "本社を東京都千代田区西神田",
      "significance": "業界首位メーカー誕生。浅野・小野田・秩父の3系譜が1社に統合",
      "source": "有価証券報告書"
    },
    {
      "date": "2000/7",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "小野田ALCがクリオン株式会社となる",
      "detail": "日本イトン工業・日本シポレックス工業から営業譲受",
      "significance": "ALC事業の業界再編",
      "source": "有価証券報告書"
    },
    {
      "date": "2003/5",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "本社を東京都中央区明石町に移転",
      "detail": "",
      "significance": "本社機能の再配置",
      "source": "有価証券報告書"
    },
    {
      "date": "2007/4",
      "category": "株式上場",
      "region": "",
      "importance": 1,
      "event": "パシフィックシステムがジャスダック上場",
      "detail": "",
      "significance": "子会社の資本市場活用",
      "source": "有価証券報告書"
    },
    {
      "date": "2009/3",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "初の純損失を計上",
      "detail": "FY08純損失▲353億円",
      "significance": "リーマンショックに伴う米国需要急減と特別損失計上",
      "source": "有価証券報告書",
      "amount": "純損失▲353億円"
    },
    {
      "date": "2009/5",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "本社を東京都港区台場に移転",
      "detail": "",
      "significance": "本社機能の再配置",
      "source": "有価証券報告書"
    },
    {
      "date": "2010/3",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "2期連続の純損失",
      "detail": "FY09純損失▲370億円",
      "significance": "北米事業の赤字（北米セグメント▲115億円）と特別損失が継続",
      "source": "有価証券報告書",
      "amount": "純損失▲370億円"
    },
    {
      "date": "2011/6",
      "category": "社長交代",
      "region": "",
      "importance": 2,
      "event": "福田修二が代表取締役社長就任",
      "detail": "徳植桂治から交代",
      "significance": "リーマンショック後の経営立て直し",
      "source": "有価証券報告書"
    },
    {
      "date": "2015/6",
      "category": "企業買収",
      "region": "米州",
      "importance": 2,
      "event": "米国カリフォルニア州のオログランデ工場を買収",
      "detail": "",
      "significance": "米国事業の生産能力拡大",
      "source": "有価証券報告書"
    },
    {
      "date": "2016/8",
      "category": "企業買収",
      "region": "",
      "importance": 1,
      "event": "株式会社デイ・シイを株式交換により完全子会社化",
      "detail": "",
      "significance": "国内セメント販売網の強化",
      "source": "有価証券報告書"
    },
    {
      "date": "2017/6",
      "category": "社長交代",
      "region": "",
      "importance": 2,
      "event": "不死原正文が代表取締役社長就任",
      "detail": "福田修二から交代",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2020/5",
      "category": "組織再編",
      "region": "",
      "importance": 1,
      "event": "本社を東京都文京区小石川に移転",
      "detail": "文京ガーデンゲートタワー",
      "significance": "",
      "source": "有価証券報告書"
    },
    {
      "date": "2022/6",
      "category": "企業買収",
      "region": "米州",
      "importance": 2,
      "event": "レディング工場及び生コンクリート事業用資産（米国カリフォルニア州）を買収",
      "detail": "",
      "significance": "米国西海岸事業の拡大",
      "source": "有価証券報告書"
    },
    {
      "date": "2023/3",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "純損失▲332億円",
      "detail": "FY22。エネルギー高騰とセメント国内の営業赤字▲369億円",
      "significance": "エネルギー価格高騰による原価急増と値上げラグでセメント国内が赤字化",
      "source": "有価証券報告書",
      "amount": "純損失▲332億円"
    },
    {
      "date": "2023/4",
      "category": "企業買収",
      "region": "",
      "importance": 1,
      "event": "デンカ株式会社のセメント販売事業を譲受",
      "detail": "",
      "significance": "国内販売網の補強",
      "source": "有価証券報告書"
    },
    {
      "date": "2023/6",
      "category": "社長交代",
      "region": "",
      "importance": 2,
      "event": "田浦良文が代表取締役社長就任",
      "detail": "不死原正文から交代",
      "significance": "赤字転落直後の経営体制刷新",
      "source": "有価証券報告書"
    },
    {
      "date": "2024/3",
      "category": "",
      "region": "",
      "importance": 2,
      "event": "黒字転換（FY23）",
      "detail": "営業利益565億円、純利益433億円",
      "significance": "値上げ浸透・石炭価格下落・米国好調により急回復",
      "source": "IR",
      "amount": "営業利益565億円"
    },
    {
      "date": "2025/3",
      "category": "",
      "region": "",
      "importance": 3,
      "event": "営業利益778億円、過去高水準",
      "detail": "FY24。営業利益率8.7%、純利益574億円",
      "significance": "減価償却方法変更（定率法→定額法）で営業利益+74.6億円寄与",
      "source": "IR",
      "amount": "営業利益778億円"
    },
    {
      "date": "2026/2",
      "category": "",
      "region": "東南アジア",
      "importance": 4,
      "event": "フィリピン子会社TCPIで減損損失244億円",
      "detail": "FY25-3Qの特別損失。新型コロナ後の需要停滞とベトナム品流入で収益改善が想定以上に遅延",
      "significance": "2021年以降の設備投資400億円の回収見通し悪化。通期純利益予想を574億円→170億円へ下方修正",
      "source": "IR",
      "amount": "減損損失244億円"
    }
  ]
}