Idemitsu Kosan

Shareholders

Foreign ownership · FYE Mar 2025: 29.6%
Financial institutions: 20.4%
Other corporations: 24.2%
Individuals & others: 22.2%
Ten largest, combined: 50.9%
Shareholders: 90,337

Ownership mix Government Financial institutions Securities firms Other corporations Foreign corporations Foreign individuals Individuals & others

Share of the company held by each class of owner, as filed each year (%). The seven classes add up to the whole company.

Ownership by holder class, every year on record (%), 2019–2025. Scroll sideways for earlier years.
Fiscal year	Unit	2019 ^*1 FYE Mar	2020 ^*1 FYE Mar	2021 ^*1 FYE Mar	2022 ^*1 FYE Mar	2023 ^*1 FYE Mar	2024 ^*1 FYE Mar	2025 ^*1 FYE Mar
Government	%	—	—	0.0%	—	—	—	—
Financial institutions	%	27.5%	30.6%	30.9%	31.6%	28.6%	28.4%	20.4%
Securities firms	%	3.0%	2.9%	4.2%	4.1%	3.7%	4.3%	3.6%
Other corporations	%	30.7%	22.0%	21.4%	20.9%	24.1%	23.4%	24.2%
Foreign corporations	%	23.3%	27.7%	26.8%	30.4%	29.2%	28.8%	29.6%
Foreign individuals	%	0.0%	0.0%	0.1%	0.0%	0.0%	0.0%	0.0%
Individuals & others	%	15.6%	16.7%	16.7%	12.9%	14.4%	15.0%	22.2%
Shareholders	holders	15,571	62,376	65,074	51,784	55,907	98,536	90,337

*1 Securities report (yuka shoken hokokusho) — status of shares by holder category, as filed

Foreign ownership Foreign holders, combined Foreign corporations Foreign individuals

How much of the company sits with holders outside Japan (%). Almost all of it is institutional: overseas individuals rarely hold Japanese stock directly.

Foreign holdings by fiscal year (%), with the year-on-year move in percentage points.
Fiscal year	Unit	2019 ^*1 FYE Mar	2020 ^*1 FYE Mar	2021 ^*1 FYE Mar	2022 ^*1 FYE Mar	2023 ^*1 FYE Mar	2024 ^*1 FYE Mar	2025 ^*1 FYE Mar
Foreign holders, combined	%	23.3%	27.7%	26.9%	30.5%	29.3%	28.8%	29.6%
Change	pp	—	+4.4pp	-0.8pp	+3.6pp	-1.2pp	-0.5pp	+0.8pp
Foreign corporations	%	23.3%	27.7%	26.8%	30.4%	29.2%	28.8%	29.6%
Foreign individuals	%	0.0%	0.0%	0.1%	0.0%	0.0%	0.0%	0.0%
Foreign corporate holders	holders	565	553	561	580	562	540	572

*1 Securities report (yuka shoken hokokusho) — status of shares by holder category, as filed

Concentration Ten largest, combined Largest holder

How much of the company the ten largest shareholders hold between them (%). Japanese filings list trust banks and custodians under their own names, so a single line here often stands for many underlying investors.

Combined stake of the ten largest shareholders, and of the single largest, by fiscal year (%).
Fiscal year	Unit	2016 ^*1 FYE Mar	2017 ^*1 FYE Mar	2018 ^*1 FYE Mar	2019 ^*1 FYE Mar	2020 ^*1 FYE Mar	2021 ^*1 FYE Mar	2022 ^*1 FYE Mar	2023 ^*1 FYE Mar	2024 ^*1 FYE Mar	2025 ^*1 FYE Mar
Ten largest, combined	%	49.7%	48.7%	41.6%	43.6%	42.2%	43.1%	50.8%	50.9%	53.1%	50.9%
Change	pp	—	-1.0pp	-7.1pp	+2.0pp	-1.4pp	+0.9pp	+7.7pp	+0.1pp	+2.2pp	-2.2pp
Largest holder	%	16.9%	16.9%	13.0%	13.7%	9.1%	9.1%	13.7%	13.1%	14.1%	10.8%

*1 Securities report (yuka shoken hokokusho) — ten largest shareholders, as filed

Holders and shares by class

The counts behind the percentages: how many shareholders sit in each class, and how much stock they hold. Shares are in trading units (tan'i) as filed — one unit is usually 100 shares.

Shareholder counts and holdings by class, every year on record. Treasury stock and odd-lot holdings are excluded, so the classes may not sum exactly to the issued total.
Fiscal year	Unit	2019 ^*1 FYE Mar	2020 ^*1 FYE Mar	2021 ^*1 FYE Mar	2022 ^*1 FYE Mar	2023 ^*1 FYE Mar	2024 ^*1 FYE Mar	2025 ^*1 FYE Mar
Government — holders	holders	—	—	1	—	—	—	—
Financial institutions — holders	holders	81	113	102	91	84	87	87
Securities firms — holders	holders	32	59	37	40	46	50	41
Other corporations — holders	holders	600	1,174	1,177	1,063	1,092	1,304	1,204
Foreign corporations — holders	holders	565	553	561	580	562	540	572
Foreign individuals — holders	holders	22	79	121	88	137	325	298
Individuals & others — holders	holders	14,271	60,398	63,075	49,922	53,986	96,230	88,135
All holders	holders	15,571	62,376	65,074	51,784	55,907	98,536	90,337
Government — shares	units	—	—	1	—	—	—	—
Financial institutions — shares	units	571,904	907,952	917,571	936,429	848,196	3,954,456	2,765,581
Securities firms — shares	units	61,916	86,678	123,529	122,447	109,717	605,255	495,308
Other corporations — shares	units	638,213	653,622	634,448	621,501	715,718	3,263,958	3,289,714
Foreign corporations — shares	units	483,874	821,539	795,937	903,432	867,762	4,003,751	4,010,978
Foreign individuals — shares	units	94	338	1,386	682	1,039	5,060	3,796
Individuals & others — shares	units	323,766	496,111	494,418	383,723	426,183	2,086,126	3,007,929
All shares	units	2,079,767	2,966,240	2,967,290	2,968,214	2,968,615	13,918,606	13,573,306

*1 Securities report (yuka shoken hokokusho) — status of shares by holder category, as filed

日本語版 — the named list of major shareholders → The ten largest holders are filed under their registered Japanese names — trust-bank omnibus accounts and transliterated custodian names that have no English equivalent — so they are not reproduced here. The Japanese edition carries the full name-by-name table, year by year.

Figures are the ownership breakdown as filed in each year's securities report, at that fiscal year's record date. Treasury stock and odd-lot holdings are excluded from the class percentages, so a company that holds much of its own stock will show classes summing to slightly under the whole.

Read the company history → Financial history → 日本語版（詳細）— full shareholder data in Japanese →

Disclaimer

This page is provided for general information only and is not investment advice, nor a recommendation to buy or sell any security.
Figures are compiled independently and include our own estimates, approximations and machine-processed data; we make no warranty as to their accuracy or completeness.
Sources are primarily each company's securities reports and other public filings, but errors and omissions may remain.
Ownership changes continuously; a filed breakdown describes one record date, not the position today.
Company names, logos and other marks belong to their respective owners.

Data API

Idemitsu Kosan’s history, financials, executives and shareholders are published as static JSON — no key, plain GET. Full specification →

Method	Endpoint	Returns
GET	/api/companies.json	All companies
GET	/api/5019/manifest.json	Resource index
GET	/api/5019/history.json	History overview
GET	/api/5019/timeline.json	Chronology
GET	/api/decisions.json	All management decisions (index)
GET	/api/5019/decisions.json	Management decisions (index)
GET	/api/5019/decisions/{slug}.json	One decision (full dossier)
GET	/api/5019/executives.json	Executives
GET	/api/5019/shareholders.json	Major shareholders
GET	/api/5019/financials.json	Financial statements
GET	/api/5019/financials-longterm.json	Long-term results
GET	/api/5019/segments.json	Business segments
GET	/api/5019/regions.json	Sales by region
GET	/api/5019/workforce.json	Workforce