SUMCO

Shareholders

Foreign ownership · FYE Dec 2025: 46.8%
Financial institutions: 31.6%
Other corporations: 1.3%
Individuals & others: 18.1%
Ten largest, combined: 44.7%
Shareholders: 104,335

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 Dec	2020 ^*1 FYE Dec	2021 ^*1 FYE Dec	2022 ^*1 FYE Dec	2023 ^*1 FYE Dec	2024 ^*1 FYE Dec	2025 ^*1 FYE Dec
Government	%	—	—	—	0.0%	—	—	—
Financial institutions	%	22.8%	24.9%	22.4%	26.1%	27.0%	28.7%	31.6%
Securities firms	%	6.3%	5.9%	8.9%	11.7%	7.5%	5.2%	2.2%
Other corporations	%	14.8%	11.2%	4.1%	2.3%	1.7%	1.8%	1.3%
Foreign corporations	%	34.7%	41.8%	50.5%	41.0%	45.5%	46.1%	46.6%
Foreign individuals	%	0.0%	0.0%	0.0%	0.1%	0.1%	0.1%	0.1%
Individuals & others	%	21.4%	16.1%	14.0%	18.9%	18.2%	18.1%	18.1%
Shareholders	holders	83,269	69,057	82,280	101,891	106,024	109,016	104,335

*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 Dec	2020 ^*1 FYE Dec	2021 ^*1 FYE Dec	2022 ^*1 FYE Dec	2023 ^*1 FYE Dec	2024 ^*1 FYE Dec	2025 ^*1 FYE Dec
Foreign holders, combined	%	34.8%	41.8%	50.5%	41.0%	45.6%	46.2%	46.8%
Change	pp	—	+7.0pp	+8.7pp	-9.5pp	+4.6pp	+0.6pp	+0.6pp
Foreign corporations	%	34.7%	41.8%	50.5%	41.0%	45.5%	46.1%	46.6%
Foreign individuals	%	0.0%	0.0%	0.0%	0.1%	0.1%	0.1%	0.1%
Foreign corporate holders	holders	615	641	667	683	718	444	414

*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	2015 ^*1 FYE Dec	2016 ^*1 FYE Dec	2017 ^*1 FYE Dec	2018 ^*1 FYE Dec	2019 ^*1 FYE Dec	2020 ^*1 FYE Dec	2021 ^*1 FYE Dec	2022 ^*1 FYE Dec	2023 ^*1 FYE Dec	2024 ^*1 FYE Dec	2025 ^*1 FYE Dec
Ten largest, combined	%	51.3%	57.3%	46.7%	38.8%	37.1%	38.9%	37.8%	38.8%	41.0%	46.3%	44.7%
Change	pp	—	+6.0pp	-10.6pp	-7.9pp	-1.7pp	+1.8pp	-1.1pp	+1.0pp	+2.2pp	+5.3pp	-1.6pp
Largest holder	%	18.4%	18.4%	13.4%	13.4%	13.4%	9.9%	11.8%	15.3%	15.3%	15.4%	16.7%

*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 Dec	2020 ^*1 FYE Dec	2021 ^*1 FYE Dec	2022 ^*1 FYE Dec	2023 ^*1 FYE Dec	2024 ^*1 FYE Dec	2025 ^*1 FYE Dec
Government — holders	holders	—	—	—	1	—	—	—
Financial institutions — holders	holders	69	62	80	80	82	49	34
Securities firms — holders	holders	58	55	61	54	58	53	53
Other corporations — holders	holders	658	573	717	874	904	847	761
Foreign corporations — holders	holders	615	641	667	683	718	444	414
Foreign individuals — holders	holders	119	115	228	347	416	793	794
Individuals & others — holders	holders	81,750	67,611	80,527	99,852	103,846	106,830	102,279
All holders	holders	83,269	69,057	82,280	101,891	106,024	109,016	104,335
Government — shares	units	—	—	—	59	—	—	—
Financial institutions — shares	units	666,924	726,253	784,473	915,473	946,258	1,005,260	1,104,972
Securities firms — shares	units	184,540	172,624	313,131	409,431	263,457	180,776	77,166
Other corporations — shares	units	434,045	326,598	143,347	78,789	59,765	62,643	46,682
Foreign corporations — shares	units	1,018,368	1,216,092	1,766,723	1,433,431	1,592,462	1,613,039	1,630,614
Foreign individuals — shares	units	1,283	1,134	1,530	2,180	2,197	4,606	4,932
Individuals & others — shares	units	626,930	468,309	491,488	660,972	635,657	632,470	634,354
All shares	units	2,932,090	2,911,010	3,500,692	3,500,335	3,499,796	3,498,794	3,498,720

*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

SUMCO’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/3436/manifest.json	Resource index
GET	/api/3436/history.json	History overview
GET	/api/3436/timeline.json	Chronology
GET	/api/decisions.json	All management decisions (index)
GET	/api/3436/decisions.json	Management decisions (index)
GET	/api/3436/decisions/{slug}.json	One decision (full dossier)
GET	/api/3436/executives.json	Executives
GET	/api/3436/shareholders.json	Major shareholders
GET	/api/3436/financials.json	Financial statements
GET	/api/3436/financials-longterm.json	Long-term results
GET	/api/3436/segments.json	Business segments
GET	/api/3436/regions.json	Sales by region
GET	/api/3436/workforce.json	Workforce