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THORNTON TOMASETTI INC.

Private limited company (Ltd.) Active

Registration No.
93975
Incorporation Date
Not disclosed
Company Type
Private limited company (Ltd.)
Address
NEW YORK, United States
Website
www.thorntontomasetti.com/
Source: New York Department of State — Division of Corporations

THORNTON TOMASETTI INC. is a Private limited company (Ltd.) registered in United States under 93975, and its current status with New York Department of State — Division of Corporations is active. Its registered address on file is NEW YORK, United States. No shareholders are recorded for THORNTON TOMASETTI INC.; ownership in this jurisdiction is held as the stock ledger under state corporate law (e.g. §219 of the Delaware General Corporation Law), a record kept privately rather than filed publicly. No beneficial owner (UBO) data is recorded for THORNTON TOMASETTI INC.; access to beneficial-ownership data in this jurisdiction is governed by its own register rules. This profile is sourced directly from New York Department of State — Division of Corporations and was last updated on 18 October 2026.

Data Provenance
This record is sourced directly from official government registries, including New York Department of State — Division of Corporations.

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Officers

5

The Director Secretary of THORNTON TOMASETTI INC. currently on record is THOMAS RITTENHOUSE; five officers are currently on record for THORNTON TOMASETTI INC., filed with New York Department of State — Division of Corporations.

The register reports 28 officers in total, including past appointments, though only the 5 most relevant records are shown here.

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.

TR
THOMAS RITTENHOUSE ACTIVE

Residence
🇺🇸 United States
Occupation
Director Secretary

PD
PETER DIMAGGIO ACTIVE

Residence
🇺🇸 United States
Occupation
Director

MS
MICHAEL SQUARZINI ACTIVE

Residence
🇺🇸 United States
Occupation
Director

PD
PETER DIMAGGIO ACTIVE

Residence
🇺🇸 United States
Occupation
Officer

MS
MICHAEL SQUARZINI ACTIVE

Residence
🇺🇸 United States
Occupation
Secretary

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Group Structure

THORNTON TOMASETTI INC. has no recorded parent company — it sits at the top of its own group structure, with 8 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.

Those 8 subsidiaries span United States, Canada, United Kingdom, Hong Kong, India 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 8 go a level deeper still, with their own further subsidiaries recorded beneath them — additional ownership layers this view doesn't expand.

Ultimate HQ
THORNTON TOMASETTI INC.
United States
Weidlinger Associates, Inc.
United StatesUS NY 133140140

Thornton Tomasetti Canada Inc.
CanadaCA 12602547

THORNTON TOMASETTI LIMITED+ subsidiaries
United KingdomGB 05888655

THORNTON TOMASETTI DEFENCE LIMITED
United KingdomGB 02390791

THORNTON TOMASETTI HOLDINGS UK LTD+ subsidiaries
United KingdomGB 11338702

Becker Structural Engineers, Inc.
United StatesUS ME 20002240 D

THE THORNTON TOMASETTI GROUP LIMITED
Hong KongHK 32654609

THORNTON TOMASETTI INC
IndiaIN AADCT5030H

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Map the complete corporate hierarchy: parent companies, subsidiaries, and cross-border ownership chains.

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Frequently Asked Questions

Who is THORNTON TOMASETTI INC.'s UBO (Ultimate Beneficial Owner)?

No Ultimate Beneficial Owner (UBO) data is recorded for THORNTON TOMASETTI INC.; access to beneficial-ownership data in this jurisdiction is governed by its own register rules.

What is THORNTON TOMASETTI INC.'s company registration number?

THORNTON TOMASETTI INC.'s registration number is 93975, filed with New York Department of State — Division of Corporations in United States. Its current status on the register is active.

Is THORNTON TOMASETTI INC. still an active company?

THORNTON TOMASETTI INC.'s status on New York Department of State — Division of Corporations is listed as active.

What is THORNTON TOMASETTI INC.'s registered address?

The registered address on file for THORNTON TOMASETTI INC. is NEW YORK, United States.

What legal structure is THORNTON TOMASETTI INC. registered as?

THORNTON TOMASETTI INC. is registered as a Private limited company (Ltd.) in United States.

Who are the officers/directors of THORNTON TOMASETTI INC.?

The Director Secretary of THORNTON TOMASETTI INC. currently on record is THOMAS RITTENHOUSE; five officers are currently on record for THORNTON TOMASETTI INC., filed with New York Department of State — Division of Corporations.

Does THORNTON TOMASETTI INC. have a parent company or subsidiaries?

THORNTON TOMASETTI INC. has no recorded parent company — it sits at the top of its own group structure, with 8 subsidiaries recorded beneath it across 5 jurisdictions. Those 8 subsidiaries span United States, Canada, United Kingdom, Hong Kong, India 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 8 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 THORNTON TOMASETTI INC.'s ownership over time?

This profile reflects a point-in-time snapshot from New York Department of State — Division of Corporations. Zavia's monitoring API can track changes to THORNTON TOMASETTI INC.'s registered shareholders, officers, and group structure going forward, flagging updates as they're filed rather than requiring a manual recheck.

Can I access THORNTON TOMASETTI INC.'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 THORNTON TOMASETTI INC.'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 York Department of State — Division of Corporations and was last synced on 18 October 2026.

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