SUMCO Co., Ltd.
SUMCO Co., Ltd. is a Private limited company (Ltd.) registered in Japan under 3010401046159, and its current status with National Tax Agency — Corporate Number Publication Site is active. The company was incorporated on 5 October 2015 and lists its registered address as Minato Ward, Japan. No shareholders are recorded for SUMCO Co., Ltd.; ownership in this jurisdiction is held as the kabunushi meibo (shareholder register) under Articles 121-122 of the Companies Act, a record kept privately rather than filed publicly. No beneficial owner (UBO) data is recorded for SUMCO Co., Ltd.; access to beneficial-ownership data in this jurisdiction is governed by its own register rules. This profile is sourced directly from National Tax Agency — Corporate Number Publication Site and was last updated on 30 September 2026.
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Officers
5
Directors and officers of SUMCO Co., Ltd.
The Ceo & Chairman of SUMCO Co., Ltd. currently on record is MAYUKI HASHIMOTO; five officers are currently on record for SUMCO Co., Ltd., filed with National Tax Agency — Corporate Number Publication Site. The source filing doesn't specify representation authority — whether officers can act individually or must sign jointly to bind the company — so that detail isn't available here.
Data availability
The register reports 14 officers in total, including past appointments, though only the 5 most relevant records are shown here.
Data-provider feed — rows as supplied to Zavia for National Tax Agency — Corporate Number Publication Site, including entries the profile above does not cover. These rows are not a verbatim copy of the register: they have been found to duplicate the same person under different spellings and to keep a status of Active after an appointment ended. Where they disagree with the profile above, the profile is the checked version.
Group Structure
Group structure of SUMCO Co., Ltd.
SUMCO Co., Ltd. has no recorded parent company — it sits at the top of its own group structure, with 11 subsidiaries recorded beneath it across 5 jurisdictions. Each of these downward relationships is derived rather than filed: resolved by matching entities across the registry network, not stated directly in a single document.
- SUMCO EUROPE SALES PLC (United Kingdom)
- High-Purity Silicon America Corporation (United States)
- HIGH-PURITY SILICON CORPORATION (Japan)
- SUMCO SINGAPORE PTE. LTD. (Singapore)
- SUMCO TECHNOLOGY CORP. (Japan)
- Sumco Taiwan Technology Corporation (Taiwan)
- SUMCO TECHXIV CORPORATION (Japan)
- SUMCO SERVICE CORP. (Japan)
- Sumco Phoenix Corporation (United States)
- Sumitomo Mitsubishi Silicon Corp. (Taiwan)
Data availability
Those 11 subsidiaries span Japan, United Kingdom, United States, Singapore, Taiwan jurisdictions, though this list should not be read as complete — subsidiaries only become visible here where shareholder data has actually been filed with a register, so holdings in jurisdictions without that filing simply won't appear. Two of the 11 go a level deeper still, with their own further subsidiaries recorded beneath them — additional ownership layers this view doesn't expand.
Data-provider feed — rows as supplied to Zavia for National Tax Agency — Corporate Number Publication Site, including entries the profile above does not cover. These rows are not a verbatim copy of the register: they have been found to duplicate the same person under different spellings and to keep a status of Active after an appointment ended. Where they disagree with the profile above, the profile is the checked version.
SUMCO Co., Ltd.
Japan
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Frequently Asked Questions
Who is SUMCO Co., Ltd.'s UBO (Ultimate Beneficial Owner)?
No Ultimate Beneficial Owner (UBO) data is recorded for SUMCO Co., Ltd.; access to beneficial-ownership data in this jurisdiction is governed by its own register rules.
What is SUMCO Co., Ltd.'s company registration number?
SUMCO Co., Ltd.'s registration number is 3010401046159, filed with National Tax Agency — Corporate Number Publication Site in Japan. Its current status on the register is active.
Is SUMCO Co., Ltd. still an active company?
SUMCO Co., Ltd.'s status on National Tax Agency — Corporate Number Publication Site is listed as active.
When was SUMCO Co., Ltd. incorporated?
SUMCO Co., Ltd. was incorporated on 5 October 2015, according to National Tax Agency — Corporate Number Publication Site.
What is SUMCO Co., Ltd.'s registered address?
The registered address on file for SUMCO Co., Ltd. is Minato Ward, Japan.
What legal structure is SUMCO Co., Ltd. registered as?
SUMCO Co., Ltd. is registered as a Private limited company (Ltd.) in Japan.
Who are the officers/directors of SUMCO Co., Ltd.?
The Ceo & Chairman of SUMCO Co., Ltd. currently on record is MAYUKI HASHIMOTO; five officers are currently on record for SUMCO Co., Ltd., filed with National Tax Agency — Corporate Number Publication Site.
Does SUMCO Co., Ltd. have a parent company or subsidiaries?
SUMCO Co., Ltd. has no recorded parent company — it sits at the top of its own group structure, with 11 subsidiaries recorded beneath it across 5 jurisdictions. Those 11 subsidiaries span Japan, United Kingdom, United States, Singapore, Taiwan jurisdictions, though this list should not be read as complete — subsidiaries only become visible here where shareholder data has actually been filed with a register, so holdings in jurisdictions without that filing simply won't appear. Two of the 11 go a level deeper still, with their own further subsidiaries recorded beneath them — additional ownership layers this view doesn't expand.
Can Zavia monitor changes to SUMCO Co., Ltd.'s ownership over time?
This profile reflects a point-in-time snapshot from National Tax Agency — Corporate Number Publication Site. Zavia's monitoring API can track changes to SUMCO Co., Ltd.'s registered shareholders, officers, and group structure going forward, flagging updates as they're filed rather than requiring a manual recheck.
Can I access SUMCO Co., Ltd.'s data through an API?
Yes. Zavia's API connects directly to official government ownership registries across 195 countries and territories, including Japan, so records like SUMCO Co., Ltd.'s registration, shareholder, UBO, and group-structure data can be queried programmatically instead of viewed one page at a time.
Where does this company information come from, and how current is it?
This record is sourced directly from National Tax Agency — Corporate Number Publication Site and was last synced on 30 September 2026.