Allegro Microsystems, LLC
Allegro Microsystems, LLC is a Private limited company (Ltd.) registered in United States under 152392, and its current status with New Hampshire Secretary of State is active. The company was incorporated on 3 December 1990 and lists its registered address as Manchester, United States. 3 shareholders are on record for Allegro Microsystems, LLC, and since every one of them is a company rather than an individual, this particular filing does not on its own establish an ultimate beneficial owner (UBO) — identifying one would mean tracing the ownership of each shareholding company in turn. This profile is sourced directly from New Hampshire Secretary of State and was last updated on 15 September 2026.
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Shareholders
3
Three shareholders are currently on record for Allegro Microsystems, LLC, reflecting the stock ledger maintained under state corporate law (e.g. §219 of the Delaware General Corporation Law) rather than a public filing.
The largest of these is Vanguard Group Inc, holding 9.5% — the largest recorded stake — followed by SmallCap World Fund Inc at 4.2%; the remaining 1 shareholder shown holds smaller stakes.
Because every shareholder shown is a company rather than an individual, the ownership chain continues above this level, and no beneficial owner can be established from this filing alone.
| Shareholder | Type | Holding | Source Document |
|---|---|---|---|
| Vanguard Group Inc | 9.5% | New Hampshire Secretary of State | |
| SmallCap World Fund Inc | 4.2% | New Hampshire Secretary of State | |
| VANGUARD WORLD FUND-Vanguard Information Technology Index Fund | 2.1% | New Hampshire Secretary of State |
Officers
5
The Vp & Chief Accounting Officer of Allegro Microsystems, LLC on record is Roald G. Webster; 5 officers are shown here, filed with New Hampshire Secretary of State.
The register reports 15 officers in total, including past appointments, though only the 5 most relevant records are shown here.
Management authority at Allegro Microsystems, LLC sits with these individuals, not with shareholders, who are covered separately and hold ownership rather than control.
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.
Group Structure
Allegro Microsystems, LLC sits 1 level below its ultimate parent, SANKEN ELECTRIC CO., LTD., registered in Japan. 7 subsidiaries are recorded beneath it, across 7 jurisdictions. The full chain up to SANKEN ELECTRIC CO., LTD. is derived by walking shareholder filings across jurisdictions; no link in it is independently corroborated by Allegro Microsystems, LLC's own shareholder record. 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.
Those 7 subsidiaries span United States, United Kingdom, Philippines, Japan, China, Ireland, and 1 more 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. One of the 7 go a level deeper still, with its own further subsidiaries recorded beneath it — additional ownership layers this view doesn't expand.
SANKEN ELECTRIC CO., LTD.
Japan
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Frequently Asked Questions
Who owns Allegro Microsystems, LLC?
Three shareholders are currently on record for Allegro Microsystems, LLC, reflecting the stock ledger maintained under state corporate law (e.g. §219 of the Delaware General Corporation Law) rather than a public filing. The largest of these is Vanguard Group Inc, holding 9.5% — the largest recorded stake — followed by SmallCap World Fund Inc at 4.2%; the remaining 1 shareholder shown holds smaller stakes. Because every shareholder shown is a company rather than an individual, the ownership chain continues above this level, and no beneficial owner can be established from this filing alone.
Who is Allegro Microsystems, LLC's UBO (Ultimate Beneficial Owner)?
Every shareholder recorded for Allegro Microsystems, LLC is itself a company rather than a natural person, so no Ultimate Beneficial Owner (UBO) is identified at this level; establishing one would require tracing the ownership of each shareholding company in turn.
How many shareholders does Allegro Microsystems, LLC have on record?
3 shareholders are shown on record for Allegro Microsystems, LLC.
What is Allegro Microsystems, LLC's company registration number?
Allegro Microsystems, LLC's registration number is 152392, filed with New Hampshire Secretary of State in United States. Its current status on the register is active.
Is Allegro Microsystems, LLC still an active company?
Allegro Microsystems, LLC's status on New Hampshire Secretary of State is listed as active.
When was Allegro Microsystems, LLC incorporated?
Allegro Microsystems, LLC was incorporated on 3 December 1990, according to New Hampshire Secretary of State.
What is Allegro Microsystems, LLC's registered address?
The registered address on file for Allegro Microsystems, LLC is Manchester, United States.
What legal structure is Allegro Microsystems, LLC registered as?
Allegro Microsystems, LLC is registered as a Private limited company (Ltd.) in United States.
Who are the officers/directors of Allegro Microsystems, LLC?
The Vp & Chief Accounting Officer of Allegro Microsystems, LLC on record is Roald G. Webster; 5 officers are shown here, filed with New Hampshire Secretary of State. Management authority at Allegro Microsystems, LLC sits with these individuals, not with shareholders, who are covered separately and hold ownership rather than control.
Does Allegro Microsystems, LLC have a parent company or subsidiaries?
Allegro Microsystems, LLC sits 1 level below its ultimate parent, SANKEN ELECTRIC CO., LTD., registered in Japan. 7 subsidiaries are recorded beneath it, across 7 jurisdictions. Those 7 subsidiaries span United States, United Kingdom, Philippines, Japan, China, Ireland, and 1 more 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. One of the 7 go a level deeper still, with its own further subsidiaries recorded beneath it — additional ownership layers this view doesn't expand.
Can Zavia monitor changes to Allegro Microsystems, LLC's ownership over time?
This profile reflects a point-in-time snapshot from New Hampshire Secretary of State. Zavia's monitoring API can track changes to Allegro Microsystems, LLC's registered shareholders, officers, and group structure going forward, flagging updates as they're filed rather than requiring a manual recheck.
Can I access Allegro Microsystems, LLC's data through an API?
Yes. Zavia's API connects directly to official government ownership registries across 195 countries and territories, including United States, so records like Allegro Microsystems, LLC'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 New Hampshire Secretary of State and was last synced on 15 September 2026.