{
  "spec_version": "4",
  "endpoint": "ceo",
  "stock_code": "3436",
  "company_name": "SUMCO",
  "content_lang": "ja",
  "meta_lang": "en",
  "canonical_url": "https://the-shashi.com/tse/3436/ceo/",
  "api_url": "/api/3436/ceo.json",
  "updated": "2026-09-18",
  "license": "© 2026 Yutaka Sugiura. All rights reserved.",
  "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/3436/ceo/",
  "source": {
    "ceo": {
      "primary": [
        "有価証券報告書（役員の状況）"
      ],
      "extraction": "EDINET の XBRL から機械抽出した役員表を土台に、雑誌記事・社史・報道で経歴と出自を補完",
      "caveat": "在任区間は career の is_ceo_appointed が正本。退任年月は次の代の就任年月から決まる"
    }
  },
  "count": 6,
  "ceo": [
    {
      "slug": "shigematsu-kenjiro",
      "name": "重松健二郎",
      "kana": "しげまつ　けんじろう",
      "hometown": "茨城県",
      "education": "東京大学工学部舶用機械学科 (1968)",
      "education_source": "https://ja.wikipedia.org/wiki/%E9%87%8D%E6%9D%BE%E5%81%A5%E4%BA%8C%E9%83%8E",
      "prev_role": "取締役・副社長",
      "career": [
        {
          "company": "住友金属工業株式会社",
          "from": "1968-04",
          "to": "2005-04",
          "roles": [
            {
              "date": "1968-04",
              "role": "入社"
            },
            {
              "date": "1998-06",
              "role": "取締役、支配人"
            },
            {
              "date": "1999-04",
              "role": "常務執行役員、鹿島製鉄所長"
            },
            {
              "date": "2002-04",
              "role": "専務執行役員、鋼板・建材カンパ ニー副カンパニー長"
            },
            {
              "date": "2003-04",
              "role": "副社長"
            },
            {
              "date": "2003-06",
              "role": "取締役・副社長(代表取締役)"
            }
          ]
        },
        {
          "company": "SUMCO",
          "from": "2005-04",
          "to": null,
          "roles": [
            {
              "date": "2005-04",
              "role": "取締役・副社長"
            },
            {
              "date": "2005-12",
              "role": "取締役社長(代表取締役)",
              "is_ceo_appointed": true
            },
            {
              "date": "2009-05",
              "role": "社長退任（次期社長登用による推定）",
              "is_ceo_retired": true,
              "retirement_basis": "next_ceo"
            }
          ]
        }
      ],
      "html_url": "https://the-shashi.com/tse/3436/executives/ceo/shigematsu-kenjiro/",
      "term_start": "2005-12",
      "term_end": "2009-05"
    },
    {
      "slug": "taguchi-yoichi",
      "name": "田口洋一",
      "kana": "たぐち　よういち",
      "hometown": "秋田県",
      "education": "早稲田大学法学部 (1970)",
      "education_source": "https://ja.wikipedia.org/wiki/%E7%94%B0%E5%8F%A3%E6%B4%8B%E4%B8%80",
      "prev_role": "取締役副社長",
      "career": [
        {
          "company": "三菱マテリアル",
          "from": "1970-04",
          "to": "2009-04",
          "roles": [
            {
              "date": "1970-04",
              "role": "三菱金属鉱業 入社"
            },
            {
              "date": "2002-06",
              "role": "執行役員"
            },
            {
              "date": "2003-06",
              "role": "常務執行役員"
            },
            {
              "date": "2005-06",
              "role": "常務取締役"
            },
            {
              "date": "2009-02",
              "role": "取締役副社長"
            }
          ]
        },
        {
          "company": "SUMCO",
          "from": "2009-04",
          "to": null,
          "roles": [
            {
              "date": "2009-04",
              "role": "取締役副社長"
            },
            {
              "date": "2009-05",
              "role": "取締役社長",
              "is_ceo_appointed": true
            },
            {
              "date": "2012-04",
              "role": "社長退任（次期社長登用による推定）",
              "is_ceo_retired": true,
              "retirement_basis": "next_ceo"
            }
          ]
        }
      ],
      "html_url": "https://the-shashi.com/tse/3436/executives/ceo/taguchi-yoichi/",
      "term_start": "2009-05",
      "term_end": "2012-04"
    },
    {
      "slug": "hashimoto-mayuki",
      "name": "橋本眞幸",
      "kana": "はしもと　まゆき",
      "hometown": "東京都杉並区",
      "education": "東京工業大学理学部大学院材料工学修士課程 (1976)",
      "education_source": "https://ja.wikipedia.org/wiki/%E6%A9%8B%E6%9C%AC%E7%9C%9E%E5%B9%B8",
      "prev_role": null,
      "career": [
        {
          "company": "三菱マテリアル",
          "from": "1976-04",
          "to": "2012-04",
          "roles": [
            {
              "date": "1976-04",
              "role": "入社"
            },
            {
              "date": "2005-06",
              "role": "執行役員"
            },
            {
              "date": "2006-06",
              "role": "常務執行役員"
            },
            {
              "date": "2007-06",
              "role": "代表取締役・常務取締役"
            },
            {
              "date": "2011-06",
              "role": "代表取締役副社長"
            }
          ]
        },
        {
          "company": "SUMCO",
          "from": "2012-04",
          "to": null,
          "roles": [
            {
              "date": "2012-04",
              "role": "代表取締役社長",
              "is_ceo_appointed": true
            },
            {
              "date": "2016-03",
              "role": "代表取締役会長兼CEO",
              "is_ceo_retired": true,
              "retirement_basis": "next_ceo"
            }
          ]
        }
      ],
      "sections": {
        "tenure_summary": "長期政権下でAI需要を見据えた300mm先端品集中戦略を主導し、長期契約に支えられた供給能力増強を続けた経営者である。\n\n66年続いた小径ウェーハ事業からの撤退を決断し、300mm専業会社への構造転換と特別損失計上を主導した経営姿勢を示した。"
      },
      "html_url": "https://the-shashi.com/tse/3436/executives/ceo/hashimoto-mayuki/",
      "term_start": "2012-04",
      "term_end": "2016-03"
    },
    {
      "slug": "takii-michiharu",
      "name": "瀧井道治",
      "kana": "たきい　みちはる",
      "hometown": "和歌山県",
      "education": "東京大学法学部 (1974)",
      "education_source": "https://ja.wikipedia.org/wiki/%E7%80%A7%E4%BA%95%E9%81%93%E6%B2%BB",
      "prev_role": "代表取締役副社長",
      "career": [
        {
          "company": "住友金属工業",
          "from": "1974-04",
          "to": "2012-04",
          "roles": [
            {
              "date": "1974-04",
              "role": "入社"
            },
            {
              "date": "2005-04",
              "role": "常務執行役員、和歌山製鉄所副所長"
            },
            {
              "date": "2005-10",
              "role": "常務執行役員、経営企画部長"
            },
            {
              "date": "2009-04",
              "role": "専務執行役員"
            },
            {
              "date": "2009-06",
              "role": "取締役、専務執行役員"
            }
          ]
        },
        {
          "company": "SUMCO",
          "from": "2012-04",
          "to": null,
          "roles": [
            {
              "date": "2012-04",
              "role": "代表取締役副社長（社長補佐）"
            },
            {
              "date": "2016-03",
              "role": "代表取締役社長兼COO",
              "is_ceo_appointed": true
            },
            {
              "date": "2018-03",
              "role": "代表取締役副会長",
              "is_ceo_retired": true,
              "retirement_basis": "next_ceo"
            }
          ]
        }
      ],
      "references": [
        {
          "source": "SUMCO 有価証券報告書【役員の状況】",
          "for": [
            "career"
          ]
        }
      ],
      "html_url": "https://the-shashi.com/tse/3436/executives/ceo/takii-michiharu/",
      "term_start": "2016-03",
      "term_end": "2018-03"
    },
    {
      "slug": "furuya-hisashi",
      "name": "降屋久",
      "kana": "ふるや　ひさし",
      "hometown": "東京都",
      "education": "東京都立大学大学院 (1983)",
      "education_source": "https://ja.wikipedia.org/wiki/%E9%99%8D%E5%B1%8B%E4%B9%85",
      "prev_role": "取締役副社長",
      "career": [
        {
          "company": "三菱マテリアル",
          "from": "1983-04",
          "to": "2005-04",
          "roles": [
            {
              "date": "1983-04",
              "role": "三菱金属 入社"
            }
          ]
        },
        {
          "company": "SUMCO",
          "from": "2005-04",
          "to": null,
          "roles": [
            {
              "date": "2005-04",
              "role": "生産・技術本部結晶技術部長"
            },
            {
              "date": "2007-04",
              "role": "生産・技術本部米沢事業所長"
            },
            {
              "date": "2008-04",
              "role": "執行役員、生産・技術本部米沢事業所長"
            },
            {
              "date": "2011-04",
              "role": "常務執行役員、ソーラー事業部長"
            },
            {
              "date": "2012-10",
              "role": "常務執行役員、技術本部長"
            },
            {
              "date": "2013-04",
              "role": "取締役・常務執行役員、技術本部長"
            },
            {
              "date": "2014-03",
              "role": "取締役・専務執行役員、技術本部長"
            },
            {
              "date": "2017-03",
              "role": "取締役副社長、技術本部長"
            },
            {
              "date": "2018-03",
              "role": "代表取締役社長兼COO",
              "is_ceo_appointed": true
            },
            {
              "date": "2020-01",
              "role": "代表取締役社長兼COO、技術本部長"
            },
            {
              "date": "2022-03",
              "role": "社長退任（次期社長登用による推定）",
              "is_ceo_retired": true,
              "retirement_basis": "next_ceo"
            }
          ]
        }
      ],
      "references": [
        {
          "source": "SUMCO 有価証券報告書【役員の状況】",
          "for": [
            "career"
          ]
        }
      ],
      "html_url": "https://the-shashi.com/tse/3436/executives/ceo/furuya-hisashi/",
      "term_start": "2018-03",
      "term_end": "2022-03"
    },
    {
      "slug": "awa-toshihiro",
      "name": "阿波俊弘",
      "kana": "あわ　としひろ",
      "hometown": "北海道",
      "education": "北海道大学経済学部 (1984)",
      "education_source": "https://www.japanmetal.com/news-h20220210114964.html",
      "prev_role": "副社長",
      "career": [
        {
          "company": "三菱マテリアル",
          "from": "1984-04",
          "to": "2012-01",
          "roles": [
            {
              "date": "1984-04",
              "role": "三菱金属 入社"
            }
          ]
        },
        {
          "company": "SUMCO",
          "from": "2012-01",
          "to": null,
          "roles": [
            {
              "date": "2012-01",
              "role": "営業本部海外営業部長"
            },
            {
              "date": "2015-03",
              "role": "執行役員、営業本部副本部長、海外営業部長"
            },
            {
              "date": "2017-09",
              "role": "常務執行役員、営業本部副本部長"
            },
            {
              "date": "2018-03",
              "role": "取締役・常務執行役員、営業本部長"
            },
            {
              "date": "2019-03",
              "role": "常務執行役員、営業本部長"
            },
            {
              "date": "2020-03",
              "role": "専務執行役員、営業本部長"
            },
            {
              "date": "2021-03",
              "role": "副社長、営業本部長"
            },
            {
              "date": "2022-03",
              "role": "代表取締役社長、営業本部長",
              "is_ceo_appointed": true
            },
            {
              "date": "2026-03",
              "role": "常勤顧問（社長退任）",
              "is_ceo_retired": true,
              "retirement_basis": "press"
            }
          ]
        }
      ],
      "references": [
        {
          "source": "SUMCO 有価証券報告書【役員の状況】",
          "for": [
            "career"
          ]
        }
      ],
      "html_url": "https://the-shashi.com/tse/3436/executives/ceo/awa-toshihiro/",
      "term_start": "2022-03",
      "term_end": "2026-03"
    }
  ]
}