{
  "spec_version": "3",
  "endpoint": "shareholders",
  "stock_code": "1820",
  "company_name": "西松建設",
  "content_lang": "ja",
  "meta_lang": "en",
  "canonical_url": "https://the-shashi.com/tse/1820/shareholders/",
  "api_url": "/api/1820/shareholders.json",
  "updated": "2026-08-17",
  "license": "© 2026 Yutaka Sugiura. All rights reserved.",
  "attribution": "The社史 (the-shashi.com) — https://the-shashi.com/tse/1820/shareholders/",
  "source": {
    "primary": [
      "有価証券報告書（大株主の状況）"
    ],
    "extraction": "EDINET の XBRL から機械抽出。1990 年代以前は旧有価証券報告書・年鑑類からの転記",
    "row_field": "source",
    "caveat": "持株比率は各期の開示値そのまま。信託口の名寄せは行っていない"
  },
  "shareholders": [
    {
      "FY": "FY15",
      "period": "2016/3",
      "rank": 1,
      "name": "日本トラスティ・サービス信託銀行株式会社(信託口)",
      "shareholding_ratio": 9.2,
      "shares_held": 25574000
    },
    {
      "FY": "FY15",
      "period": "2016/3",
      "rank": 2,
      "name": "日本マスタートラスト信託銀行株式会社（信託口）",
      "shareholding_ratio": 6.84,
      "shares_held": 19040000
    },
    {
      "FY": "FY15",
      "period": "2016/3",
      "rank": 3,
      "name": "日本トラスティ・サービス信託銀行株式会社(信託口４)",
      "shareholding_ratio": 3.49,
      "shares_held": 9719000
    },
    {
      "FY": "FY15",
      "period": "2016/3",
      "rank": 4,
      "name": "株式会社みずほ銀行",
      "shareholding_ratio": 1.82,
      "shares_held": 5070000
    },
    {
      "FY": "FY15",
      "period": "2016/3",
      "rank": 5,
      "name": "資産管理サービス信託銀行株式会社(証券投資信託口）",
      "shareholding_ratio": 1.82,
      "shares_held": 5070000
    },
    {
      "FY": "FY15",
      "period": "2016/3",
      "rank": 6,
      "name": "NORTHERN TRUST CO. (AVFC) RE IEDU UCITSCLIENTS NON LENDING 15 PCT TREATY ACCOUNT",
      "shareholding_ratio": 1.68,
      "shares_held": 4689000
    },
    {
      "FY": "FY15",
      "period": "2016/3",
      "rank": 7,
      "name": "明治安田生命保険相互会社",
      "shareholding_ratio": 1.64,
      "shares_held": 4577000
    },
    {
      "FY": "FY15",
      "period": "2016/3",
      "rank": 8,
      "name": "みずほ信託銀行株式会社",
      "shareholding_ratio": 1.43,
      "shares_held": 4000000
    },
    {
      "FY": "FY15",
      "period": "2016/3",
      "rank": 9,
      "name": "西松建設持株会",
      "shareholding_ratio": 1.19,
      "shares_held": 3311000
    },
    {
      "FY": "FY15",
      "period": "2016/3",
      "rank": 10,
      "name": "CBNY DFA INTL SMALL CAP VALUE PORTFOLIO",
      "shareholding_ratio": 1.12,
      "shares_held": 3138000
    },
    {
      "FY": "FY16",
      "period": "2017/3",
      "rank": 1,
      "name": "日本トラスティ・サービス信託銀行株式会社(信託口)",
      "shareholding_ratio": 7.34,
      "shares_held": 20398000
    },
    {
      "FY": "FY16",
      "period": "2017/3",
      "rank": 2,
      "name": "日本マスタートラスト信託銀行株式会社(信託口)",
      "shareholding_ratio": 6.98,
      "shares_held": 19395000
    },
    {
      "FY": "FY16",
      "period": "2017/3",
      "rank": 3,
      "name": "日本トラスティ・サービス信託銀行株式会社(信託口４)",
      "shareholding_ratio": 3.5,
      "shares_held": 9728000
    },
    {
      "FY": "FY16",
      "period": "2017/3",
      "rank": 4,
      "name": "資産管理サービス信託銀行株式会社(証券投資信託口)",
      "shareholding_ratio": 2.25,
      "shares_held": 6267000
    },
    {
      "FY": "FY16",
      "period": "2017/3",
      "rank": 5,
      "name": "日本トラスティ・サービス信託銀行株式会社(信託口９)",
      "shareholding_ratio": 1.85,
      "shares_held": 5141000
    },
    {
      "FY": "FY16",
      "period": "2017/3",
      "rank": 6,
      "name": "日本トラスティ・サービス信託銀行株式会社(信託口５)",
      "shareholding_ratio": 1.71,
      "shares_held": 4758000
    },
    {
      "FY": "FY16",
      "period": "2017/3",
      "rank": 7,
      "name": "明治安田生命保険相互会社",
      "shareholding_ratio": 1.65,
      "shares_held": 4577000
    },
    {
      "FY": "FY16",
      "period": "2017/3",
      "rank": 8,
      "name": "西松建設株式会社",
      "shareholding_ratio": 1.27,
      "shares_held": 3529000
    },
    {
      "FY": "FY16",
      "period": "2017/3",
      "rank": 9,
      "name": "日本トラスティ・サービス信託銀行株式会社(信託口２)",
      "shareholding_ratio": 1.25,
      "shares_held": 3478000
    },
    {
      "FY": "FY16",
      "period": "2017/3",
      "rank": 10,
      "name": "日本トラスティ・サービス信託銀行株式会社(信託口１)",
      "shareholding_ratio": 1.24,
      "shares_held": 3438000
    },
    {
      "FY": "FY17",
      "period": "2018/3",
      "rank": 1,
      "name": "日本マスタートラスト信託銀行株式会社(信託口)",
      "shareholding_ratio": 8.13,
      "shares_held": 4449000
    },
    {
      "FY": "FY17",
      "period": "2018/3",
      "rank": 2,
      "name": "日本トラスティ・サービス信託銀行株式会社(信託口)",
      "shareholding_ratio": 6.79,
      "shares_held": 3715000
    },
    {
      "FY": "FY17",
      "period": "2018/3",
      "rank": 3,
      "name": "日本トラスティ・サービス信託銀行株式会社(信託口４)",
      "shareholding_ratio": 3.75,
      "shares_held": 2049000
    },
    {
      "FY": "FY17",
      "period": "2018/3",
      "rank": 4,
      "name": "日本トラスティ・サービス信託銀行株式会社(信託口９)",
      "shareholding_ratio": 3.6,
      "shares_held": 1968000
    },
    {
      "FY": "FY17",
      "period": "2018/3",
      "rank": 5,
      "name": "日本トラスティ・サービス信託銀行株式会社(信託口５)",
      "shareholding_ratio": 1.81,
      "shares_held": 989000
    },
    {
      "FY": "FY17",
      "period": "2018/3",
      "rank": 6,
      "name": "明治安田生命保険相互会社",
      "shareholding_ratio": 1.67,
      "shares_held": 915000
    },
    {
      "FY": "FY17",
      "period": "2018/3",
      "rank": 7,
      "name": "DFA INTL SMALL CAP VALUE PORTFOLIO(常任代理人 シティバンク、エヌ・エイ東京支店)",
      "shareholding_ratio": 1.58,
      "shares_held": 863000
    },
    {
      "FY": "FY17",
      "period": "2018/3",
      "rank": 8,
      "name": "STATE STREET BANK AND TRUST COMPANY 505103(常任代理人 株式会社みずほ銀行決済営業部)",
      "shareholding_ratio": 1.53,
      "shares_held": 837000
    },
    {
      "FY": "FY17",
      "period": "2018/3",
      "rank": 9,
      "name": "日本トラスティ・サービス信託銀行株式会社(信託口１)",
      "shareholding_ratio": 1.33,
      "shares_held": 728000
    },
    {
      "FY": "FY17",
      "period": "2018/3",
      "rank": 10,
      "name": "日本トラスティ・サービス信託銀行株式会社(信託口２)",
      "shareholding_ratio": 1.3,
      "shares_held": 712000
    },
    {
      "FY": "FY18",
      "period": "2019/3",
      "rank": 1,
      "name": "日本マスタートラスト信託銀行株式会社(信託口)",
      "shareholding_ratio": 9.77,
      "shares_held": 5345000
    },
    {
      "FY": "FY18",
      "period": "2019/3",
      "rank": 2,
      "name": "日本トラスティ・サービス信託銀行株式会社(信託口)",
      "shareholding_ratio": 9.49,
      "shares_held": 5189000
    },
    {
      "FY": "FY18",
      "period": "2019/3",
      "rank": 3,
      "name": "日本トラスティ・サービス信託銀行株式会社(信託口４)",
      "shareholding_ratio": 3.81,
      "shares_held": 2085000
    },
    {
      "FY": "FY18",
      "period": "2019/3",
      "rank": 4,
      "name": "日本トラスティ・サービス信託銀行株式会社(信託口９)",
      "shareholding_ratio": 2.26,
      "shares_held": 1234000
    },
    {
      "FY": "FY18",
      "period": "2019/3",
      "rank": 5,
      "name": "DFA INTL SMALL CAP VALUE PORTFOLIO(常任代理人 シティバンク、エヌ・エイ東京支店)",
      "shareholding_ratio": 1.98,
      "shares_held": 1084000
    },
    {
      "FY": "FY18",
      "period": "2019/3",
      "rank": 6,
      "name": "日本トラスティ・サービス信託銀行株式会社(信託口５)",
      "shareholding_ratio": 1.74,
      "shares_held": 953000
    },
    {
      "FY": "FY18",
      "period": "2019/3",
      "rank": 7,
      "name": "資産管理サービス信託銀行株式会社(証券投資信託口)",
      "shareholding_ratio": 1.68,
      "shares_held": 917000
    },
    {
      "FY": "FY18",
      "period": "2019/3",
      "rank": 8,
      "name": "明治安田生命保険相互会社",
      "shareholding_ratio": 1.67,
      "shares_held": 915000
    },
    {
      "FY": "FY18",
      "period": "2019/3",
      "rank": 9,
      "name": "資産管理サービス信託銀行株式会社(年金信託口)",
      "shareholding_ratio": 1.58,
      "shares_held": 864000
    },
    {
      "FY": "FY18",
      "period": "2019/3",
      "rank": 10,
      "name": "STATE STREET BANK AND TRUST COMPANY 505103(常任代理人 株式会社みずほ銀行決済営業部)",
      "shareholding_ratio": 1.58,
      "shares_held": 863000
    },
    {
      "FY": "FY19",
      "period": "2020/3",
      "rank": 1,
      "name": "日本マスタートラスト信託銀行株式会社(信託口)",
      "shareholding_ratio": 10.57,
      "shares_held": 5784000
    },
    {
      "FY": "FY19",
      "period": "2020/3",
      "rank": 2,
      "name": "日本トラスティ・サービス信託銀行株式会社(信託口)",
      "shareholding_ratio": 7.23,
      "shares_held": 3956000
    },
    {
      "FY": "FY19",
      "period": "2020/3",
      "rank": 3,
      "name": "NOMURA AYA(常任代理人 シティバンク、エヌ・エイ東京支店)",
      "shareholding_ratio": 4.44,
      "shares_held": 2426000
    },
    {
      "FY": "FY19",
      "period": "2020/3",
      "rank": 4,
      "name": "日本トラスティ・サービス信託銀行株式会社(信託口４)",
      "shareholding_ratio": 4.1,
      "shares_held": 2243000
    },
    {
      "FY": "FY19",
      "period": "2020/3",
      "rank": 5,
      "name": "日本トラスティ・サービス信託銀行株式会社(信託口９)",
      "shareholding_ratio": 2.51,
      "shares_held": 1372000
    },
    {
      "FY": "FY19",
      "period": "2020/3",
      "rank": 6,
      "name": "DFA INTL SMALL CAP VALUE PORTFOLIO(常任代理人 シティバンク、エヌ・エイ東京支店)",
      "shareholding_ratio": 1.97,
      "shares_held": 1076000
    },
    {
      "FY": "FY19",
      "period": "2020/3",
      "rank": 7,
      "name": "JP MORGAN CHASE BANK 385151(常任代理人 株式会社みずほ銀行決済営業部)",
      "shareholding_ratio": 1.87,
      "shares_held": 1024000
    },
    {
      "FY": "FY19",
      "period": "2020/3",
      "rank": 8,
      "name": "日本トラスティ・サービス信託銀行株式会社(信託口５)",
      "shareholding_ratio": 1.79,
      "shares_held": 980000
    },
    {
      "FY": "FY19",
      "period": "2020/3",
      "rank": 9,
      "name": "明治安田生命保険相互会社",
      "shareholding_ratio": 1.67,
      "shares_held": 915000
    },
    {
      "FY": "FY19",
      "period": "2020/3",
      "rank": 10,
      "name": "日本トラスティ・サービス信託銀行株式会社(信託口７)",
      "shareholding_ratio": 1.57,
      "shares_held": 860000
    },
    {
      "FY": "FY20",
      "period": "2021/3",
      "rank": 1,
      "name": "株式会社シティインデックスイレブンス",
      "shareholding_ratio": 9.94,
      "shares_held": 5438000
    },
    {
      "FY": "FY20",
      "period": "2021/3",
      "rank": 2,
      "name": "株式会社日本カストディ銀行(信託口)",
      "shareholding_ratio": 8.88,
      "shares_held": 4859000
    },
    {
      "FY": "FY20",
      "period": "2021/3",
      "rank": 3,
      "name": "日本マスタートラスト信託銀行株式会社(信託口)",
      "shareholding_ratio": 8.55,
      "shares_held": 4679000
    },
    {
      "FY": "FY20",
      "period": "2021/3",
      "rank": 4,
      "name": "NOMURA AYA(常任代理人 シティバンク、エヌ・エイ東京支店)",
      "shareholding_ratio": 8.41,
      "shares_held": 4600000
    },
    {
      "FY": "FY20",
      "period": "2021/3",
      "rank": 5,
      "name": "株式会社日本カストディ銀行(信託口４)",
      "shareholding_ratio": 3.92,
      "shares_held": 2144000
    },
    {
      "FY": "FY20",
      "period": "2021/3",
      "rank": 6,
      "name": "STATE STREET BANK AND TRUST COMPANY 505103(常任代理人 株式会社みずほ銀行決済営業部)",
      "shareholding_ratio": 2.02,
      "shares_held": 1102000
    },
    {
      "FY": "FY20",
      "period": "2021/3",
      "rank": 7,
      "name": "明治安田生命保険相互会社",
      "shareholding_ratio": 1.67,
      "shares_held": 915000
    },
    {
      "FY": "FY20",
      "period": "2021/3",
      "rank": 8,
      "name": "西松建設持株会",
      "shareholding_ratio": 1.47,
      "shares_held": 805000
    },
    {
      "FY": "FY20",
      "period": "2021/3",
      "rank": 9,
      "name": "株式会社エスグラントコーポレーション",
      "shareholding_ratio": 1.46,
      "shares_held": 796000
    },
    {
      "FY": "FY20",
      "period": "2021/3",
      "rank": 10,
      "name": "DFA INTL SMALL CAP VALUE PORTFOLIO(常任代理人 シティバンク、エヌ・エイ東京支店)",
      "shareholding_ratio": 1.31,
      "shares_held": 718000
    },
    {
      "FY": "FY21",
      "period": "2022/3",
      "rank": 1,
      "name": "日本マスタートラスト信託銀行株式会社(信託口)",
      "shareholding_ratio": 16.17,
      "shares_held": 6420000
    },
    {
      "FY": "FY21",
      "period": "2022/3",
      "rank": 2,
      "name": "伊藤忠商事株式会社",
      "shareholding_ratio": 10.13,
      "shares_held": 4022000
    },
    {
      "FY": "FY21",
      "period": "2022/3",
      "rank": 3,
      "name": "株式会社日本カストディ銀行(信託口)",
      "shareholding_ratio": 6.74,
      "shares_held": 2675000
    },
    {
      "FY": "FY21",
      "period": "2022/3",
      "rank": 4,
      "name": "明治安田生命保険相互会社",
      "shareholding_ratio": 2.31,
      "shares_held": 915000
    },
    {
      "FY": "FY21",
      "period": "2022/3",
      "rank": 5,
      "name": "西松建設持株会",
      "shareholding_ratio": 2.06,
      "shares_held": 815000
    },
    {
      "FY": "FY21",
      "period": "2022/3",
      "rank": 6,
      "name": "DFA INTL SMALL CAP VALUE PORTFOLIO(常任代理人 シティバンク、エヌ・エイ東京支店)",
      "shareholding_ratio": 1.88,
      "shares_held": 747000
    },
    {
      "FY": "FY21",
      "period": "2022/3",
      "rank": 7,
      "name": "高橋 新",
      "shareholding_ratio": 1.7,
      "shares_held": 675000
    },
    {
      "FY": "FY21",
      "period": "2022/3",
      "rank": 8,
      "name": "株式会社日本カストディ銀行(信託口４)",
      "shareholding_ratio": 1.59,
      "shares_held": 631000
    },
    {
      "FY": "FY21",
      "period": "2022/3",
      "rank": 9,
      "name": "株式会社みずほ銀行",
      "shareholding_ratio": 1.55,
      "shares_held": 614000
    },
    {
      "FY": "FY21",
      "period": "2022/3",
      "rank": 10,
      "name": "住友不動産株式会社",
      "shareholding_ratio": 1.54,
      "shares_held": 612000
    },
    {
      "FY": "FY22",
      "period": "2023/3",
      "rank": 1,
      "name": "日本マスタートラスト信託銀行株式会社(信託口)",
      "shareholding_ratio": 13.18,
      "shares_held": 5230000
    },
    {
      "FY": "FY22",
      "period": "2023/3",
      "rank": 2,
      "name": "伊藤忠商事株式会社",
      "shareholding_ratio": 10.13,
      "shares_held": 4022000
    },
    {
      "FY": "FY22",
      "period": "2023/3",
      "rank": 3,
      "name": "株式会社日本カストディ銀行(信託口)",
      "shareholding_ratio": 5.42,
      "shares_held": 2152000
    },
    {
      "FY": "FY22",
      "period": "2023/3",
      "rank": 4,
      "name": "明治安田生命保険相互会社",
      "shareholding_ratio": 2.31,
      "shares_held": 915000
    },
    {
      "FY": "FY22",
      "period": "2023/3",
      "rank": 5,
      "name": "西松建設持株会",
      "shareholding_ratio": 2.19,
      "shares_held": 869000
    },
    {
      "FY": "FY22",
      "period": "2023/3",
      "rank": 6,
      "name": "株式会社みずほ銀行",
      "shareholding_ratio": 1.55,
      "shares_held": 614000
    },
    {
      "FY": "FY22",
      "period": "2023/3",
      "rank": 7,
      "name": "住友不動産株式会社",
      "shareholding_ratio": 1.54,
      "shares_held": 612000
    },
    {
      "FY": "FY22",
      "period": "2023/3",
      "rank": 8,
      "name": "株式会社日本カストディ銀行(信託口４)",
      "shareholding_ratio": 1.54,
      "shares_held": 612000
    },
    {
      "FY": "FY22",
      "period": "2023/3",
      "rank": 9,
      "name": "みずほ信託銀行株式会社",
      "shareholding_ratio": 1.51,
      "shares_held": 600000
    },
    {
      "FY": "FY22",
      "period": "2023/3",
      "rank": 10,
      "name": "STATE STREET BANK WEST CLIENT - TREATY505234(常任代理人 株式会社みずほ銀行決済営業部)",
      "shareholding_ratio": 1.21,
      "shares_held": 480000
    },
    {
      "FY": "FY23",
      "period": "2024/3",
      "rank": 1,
      "name": "日本マスタートラスト信託銀行株式会社(信託口)",
      "shareholding_ratio": 18.86,
      "shares_held": 7485000
    },
    {
      "FY": "FY23",
      "period": "2024/3",
      "rank": 2,
      "name": "伊藤忠商事株式会社",
      "shareholding_ratio": 11.9,
      "shares_held": 4722000
    },
    {
      "FY": "FY23",
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}