Idemitsu Kosan Co.,Ltd.
TSE Prime
Shareholding pattern
As reported in the annual securities report, 2026-03-31.
| Foreign institutions | 31.04% |
|---|---|
| Individuals | 18.31% |
| Top 10 holders | 53.19% |
| Total shareholders | 101,053 |
Who owns the company
Share of voting unitsForeign institutions 31.04%Other corporations 25.38%Financial institutions 22.18%Individuals & others 18.31%Securities firms 3.06%Foreign individuals 0.02%
How to read this: each slice is a group of investors. Foreign and financial institutions are professional money; individuals are retail shareholders; other corporations are usually business partners holding strategic stakes. A large institutional slice generally means heavier analyst coverage and more trading volume.
Ownership Trend
Holding %, recent yearsForeign institutionsFinancial institutionsIndividualsOther corporationsSecurities firms
How to read this: each line shows how one investor group's share has moved over recent years. A rising foreign or institutional line can signal growing professional interest; a falling one the opposite. Japanese companies disclose ownership once a year, so these are annual points — read the direction over several years rather than a single step.
Ownership detail
| Investor category | Holding % | Shareholders |
|---|---|---|
| Foreign institutions | 31.04% | 640 |
| Other corporations | 25.38% | 1,228 |
| Financial institutions | 22.18% | 73 |
| Individuals & others | 18.31% | 98,677 |
| Securities firms | 3.06% | 48 |
| Foreign individuals | 0.02% | 387 |
How to read this: a high foreign or institutional share often means the stock is widely researched and more liquid; a high individual share means retail investors hold most of the company. Percentages are of voting units.
Largest shareholders
| S.No. | Shareholder | Shares | Stake % |
|---|---|---|---|
| 1 | 日本マスタートラスト信託銀行株式会社（信託口） | 148,938,400 | 12.19% |
| 2 | Aramco Overseas Company B.V.（常任代理人 アンダーソン・毛利・友常法律事務所） | 115,579,000 | 9.46% |
| 3 | 日章興産株式会社 | 109,520,390 | 8.97% |
| 4 | 公益財団法人出光美術館 | 101,962,000 | 8.35% |
| 5 | 株式会社日本カストディ銀行（信託口） | 72,561,000 | 5.94% |
| 6 | 正和興産株式会社 | 24,872,000 | 2.04% |
| 7 | 出光興産社員持株会 | 23,944,430 | 1.96% |
| 8 | 株式会社善 | 17,807,169 | 1.46% |
| 9 | 株式会社縁 | 17,591,841 | 1.44% |
| 10 | STATE STREET BANK AND TRUST COMPANY 505001（常任代理人 株式会社みずほ銀行） | 16,854,124 | 1.38% |
Trust banks such as Master Trust and Custody Bank appear at the top of most Japanese registers: they hold shares on behalf of many underlying funds rather than owning them outright.