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      "rank": 1,
      "name": "大和銀行(東京)",
      "shareholding_ratio": null,
      "shares_held": 2890800,
      "total_shares": 90000000,
      "source": "株式会社年鑑 昭和31年版"
    },
    {
      "FY": "FY55",
      "period": "1955/9",
      "company_name_at_period": "日本石油",
      "rank": 2,
      "name": "山口誠太郎",
      "shareholding_ratio": null,
      "shares_held": 1556600,
      "total_shares": 90000000,
      "source": "株式会社年鑑 昭和31年版"
    },
    {
      "FY": "FY55",
      "period": "1955/9",
      "company_name_at_period": "日本石油",
      "rank": 3,
      "name": "三菱信託",
      "shareholding_ratio": null,
      "shares_held": 1399700,
      "total_shares": 90000000,
      "source": "株式会社年鑑 昭和31年版"
    },
    {
      "FY": "FY55",
      "period": "1955/9",
      "company_name_at_period": "日本石油",
      "rank": 4,
      "name": "野村証券",
      "shareholding_ratio": null,
      "shares_held": 1370914,
      "total_shares": 90000000,
      "source": "株式会社年鑑 昭和31年版"
    },
    {
      "FY": "FY55",
      "period": "1955/9",
      "company_name_at_period": "日本石油",
      "rank": 5,
      "name": "住友信託(東京)",
      "shareholding_ratio": null,
      "shares_held": 1100400,
      "total_shares": 90000000,
      "source": "株式会社年鑑 昭和31年版"
    },
    {
      "FY": "FY55",
      "period": "1955/9",
      "company_name_at_period": "日本石油",
      "rank": 6,
      "name": "東京新聞社",
      "shareholding_ratio": null,
      "shares_held": 1100000,
      "total_shares": 90000000,
      "source": "株式会社年鑑 昭和31年版"
    },
    {
      "FY": "FY55",
      "period": "1955/9",
      "company_name_at_period": "日本石油",
      "rank": 7,
      "name": "富士銀行",
      "shareholding_ratio": null,
      "shares_held": 800000,
      "total_shares": 90000000,
      "source": "株式会社年鑑 昭和31年版"
    },
    {
      "FY": "FY55",
      "period": "1955/9",
      "company_name_at_period": "日本石油",
      "rank": 8,
      "name": "第百生命",
      "shareholding_ratio": null,
      "shares_held": 700000,
      "total_shares": 90000000,
      "source": "株式会社年鑑 昭和31年版"
    },
    {
      "FY": "FY55",
      "period": "1955/9",
      "company_name_at_period": "日本石油",
      "rank": 9,
      "name": "三井銀行",
      "shareholding_ratio": null,
      "shares_held": 700000,
      "total_shares": 90000000,
      "source": "株式会社年鑑 昭和31年版"
    },
    {
      "FY": "FY55",
      "period": "1955/9",
      "company_name_at_period": "日本石油",
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      "shares_held": 500000,
      "total_shares": 90000000,
      "source": "株式会社年鑑 昭和31年版"
    },
    {
      "FY": "FY60",
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      "company_name_at_period": "日本石油",
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      "name": "三菱信託銀行",
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      "shares_held": 12362000,
      "total_shares": 200000000,
      "source": "株式会社年鑑 昭和37年版"
    },
    {
      "FY": "FY60",
      "period": "1961/3",
      "company_name_at_period": "日本石油",
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      "name": "東洋信託銀行",
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      "shares_held": 6071000,
      "total_shares": 200000000,
      "source": "株式会社年鑑 昭和37年版"
    },
    {
      "FY": "FY60",
      "period": "1961/3",
      "company_name_at_period": "日本石油",
      "rank": 3,
      "name": "三井信託銀行",
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      "shares_held": 3464000,
      "total_shares": 200000000,
      "source": "株式会社年鑑 昭和37年版"
    },
    {
      "FY": "FY60",
      "period": "1961/3",
      "company_name_at_period": "日本石油",
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      "name": "住友信託銀行(東京)",
      "shareholding_ratio": 1.6,
      "shares_held": 3227000,
      "total_shares": 200000000,
      "source": "株式会社年鑑 昭和37年版"
    },
    {
      "FY": "FY60",
      "period": "1961/3",
      "company_name_at_period": "日本石油",
      "rank": 5,
      "name": "第百生命",
      "shareholding_ratio": 1.2,
      "shares_held": 2400000,
      "total_shares": 200000000,
      "source": "株式会社年鑑 昭和37年版"
    },
    {
      "FY": "FY60",
      "period": "1961/3",
      "company_name_at_period": "日本石油",
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      "name": "富士銀行",
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      "shares_held": 2200000,
      "total_shares": 200000000,
      "source": "株式会社年鑑 昭和37年版"
    },
    {
      "FY": "FY60",
      "period": "1961/3",
      "company_name_at_period": "日本石油",
      "rank": 7,
      "name": "三井銀行",
      "shareholding_ratio": 1.1,
      "shares_held": 2200000,
      "total_shares": 200000000,
      "source": "株式会社年鑑 昭和37年版"
    },
    {
      "FY": "FY60",
      "period": "1961/3",
      "company_name_at_period": "日本石油",
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      "name": "日本証券金融",
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      "shares_held": 1832000,
      "total_shares": 200000000,
      "source": "株式会社年鑑 昭和37年版"
    },
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      "FY": "FY60",
      "period": "1961/3",
      "company_name_at_period": "日本石油",
      "rank": 9,
      "name": "三井生命",
      "shareholding_ratio": 0.8,
      "shares_held": 1540000,
      "total_shares": 200000000,
      "source": "株式会社年鑑 昭和37年版"
    },
    {
      "FY": "FY60",
      "period": "1961/3",
      "company_name_at_period": "日本石油",
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      "name": "安田信託銀行",
      "shareholding_ratio": 0.7,
      "shares_held": 1355000,
      "total_shares": 200000000,
      "source": "株式会社年鑑 昭和37年版"
    },
    {
      "FY": "FY74",
      "period": "1975/3",
      "company_name_at_period": "日本石油",
      "rank": 1,
      "name": "三井銀行",
      "shareholding_ratio": 3.33,
      "shares_held": 15000000,
      "total_shares": null,
      "source": "日本企業要覧 1975年版"
    },
    {
      "FY": "FY74",
      "period": "1975/3",
      "company_name_at_period": "日本石油",
      "rank": 1,
      "name": "第一勧業銀行",
      "shareholding_ratio": 3.33,
      "shares_held": 15000000,
      "total_shares": null,
      "source": "日本企業要覧 1975年版"
    },
    {
      "FY": "FY74",
      "period": "1975/3",
      "company_name_at_period": "日本石油",
      "rank": 1,
      "name": "富士銀行",
      "shareholding_ratio": 3.33,
      "shares_held": 15000000,
      "total_shares": null,
      "source": "日本企業要覧 1975年版"
    },
    {
      "FY": "FY74",
      "period": "1975/3",
      "company_name_at_period": "日本石油",
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      "name": "三井生命保険",
      "shareholding_ratio": 2.32,
      "shares_held": 10450000,
      "total_shares": null,
      "source": "日本企業要覧 1975年版"
    },
    {
      "FY": "FY74",
      "period": "1975/3",
      "company_name_at_period": "日本石油",
      "rank": 5,
      "name": "第一生命保険",
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      "total_shares": null,
      "source": "日本企業要覧 1975年版"
    },
    {
      "FY": "FY74",
      "period": "1975/3",
      "company_name_at_period": "日本石油",
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      "name": "三井信託銀行",
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      "total_shares": null,
      "source": "日本企業要覧 1975年版"
    },
    {
      "FY": "FY74",
      "period": "1975/3",
      "company_name_at_period": "日本石油",
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      "name": "住友生命保険",
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      "source": "日本企業要覧 1975年版"
    },
    {
      "FY": "FY74",
      "period": "1975/3",
      "company_name_at_period": "日本石油",
      "rank": 8,
      "name": "朝日生命保険",
      "shareholding_ratio": 1.78,
      "shares_held": 8000000,
      "total_shares": null,
      "source": "日本企業要覧 1975年版"
    },
    {
      "FY": "FY74",
      "period": "1975/3",
      "company_name_at_period": "日本石油",
      "rank": 9,
      "name": "安田生命保険",
      "shareholding_ratio": 1.56,
      "shares_held": 7000000,
      "total_shares": null,
      "source": "日本企業要覧 1975年版"
    },
    {
      "FY": "FY74",
      "period": "1975/3",
      "company_name_at_period": "日本石油",
      "rank": 10,
      "name": "日本火災海上保険",
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      "shares_held": 6709000,
      "total_shares": null,
      "source": "日本企業要覧 1975年版"
    },
    {
      "FY": "FY79",
      "period": "1980/3",
      "company_name_at_period": "日本石油",
      "rank": 1,
      "name": "日本証券金融",
      "shareholding_ratio": 6.05,
      "shares_held": 38591000,
      "total_shares": 638099000,
      "source": "企業系列総覧 1981年版"
    },
    {
      "FY": "FY79",
      "period": "1980/3",
      "company_name_at_period": "日本石油",
      "rank": 2,
      "name": "三井銀行",
      "shareholding_ratio": 3.26,
      "shares_held": 20790000,
      "total_shares": 638099000,
      "source": "企業系列総覧 1981年版"
    },
    {
      "FY": "FY79",
      "period": "1980/3",
      "company_name_at_period": "日本石油",
      "rank": 2,
      "name": "第一勧業銀行",
      "shareholding_ratio": 3.26,
      "shares_held": 20790000,
      "total_shares": 638099000,
      "source": "企業系列総覧 1981年版"
    },
    {
      "FY": "FY79",
      "period": "1980/3",
      "company_name_at_period": "日本石油",
      "rank": 2,
      "name": "富士銀行",
      "shareholding_ratio": 3.26,
      "shares_held": 20790000,
      "total_shares": 638099000,
      "source": "企業系列総覧 1981年版"
    },
    {
      "FY": "FY79",
      "period": "1980/3",
      "company_name_at_period": "日本石油",
      "rank": 5,
      "name": "安田信託銀行",
      "shareholding_ratio": 2.08,
      "shares_held": 13302000,
      "total_shares": 638099000,
      "source": "企業系列総覧 1981年版"
    },
    {
      "FY": "FY79",
      "period": "1980/3",
      "company_name_at_period": "日本石油",
      "rank": 6,
      "name": "三井生命保険",
      "shareholding_ratio": 1.9,
      "shares_held": 12132000,
      "total_shares": 638099000,
      "source": "企業系列総覧 1981年版"
    },
    {
      "FY": "FY79",
      "period": "1980/3",
      "company_name_at_period": "日本石油",
      "rank": 7,
      "name": "三井信託銀行",
      "shareholding_ratio": 1.62,
      "shares_held": 10366000,
      "total_shares": 638099000,
      "source": "企業系列総覧 1981年版"
    },
    {
      "FY": "FY79",
      "period": "1980/3",
      "company_name_at_period": "日本石油",
      "rank": 8,
      "name": "朝日生命保険",
      "shareholding_ratio": 1.59,
      "shares_held": 10140000,
      "total_shares": 638099000,
      "source": "企業系列総覧 1981年版"
    },
    {
      "FY": "FY79",
      "period": "1980/3",
      "company_name_at_period": "日本石油",
      "rank": 9,
      "name": "安田生命保険",
      "shareholding_ratio": 1.54,
      "shares_held": 9802000,
      "total_shares": 638099000,
      "source": "企業系列総覧 1981年版"
    },
    {
      "FY": "FY79",
      "period": "1980/3",
      "company_name_at_period": "日本石油",
      "rank": 10,
      "name": "日本火災海上保険",
      "shareholding_ratio": 1.47,
      "shares_held": 9405000,
      "total_shares": 638099000,
      "source": "企業系列総覧 1981年版"
    }
  ]
}