Tesaro, Inc.
Tesaro, Inc. is a Public Limited Company registered in United States under 0332866, and its current status with Massachusetts Secretary of the Commonwealth is active. Its registered address on file is WALTHAM, United States. No shareholders are recorded for Tesaro, 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 Tesaro, Inc.; access to beneficial-ownership data in this jurisdiction is governed by its own register rules. This profile is sourced directly from Massachusetts Secretary of the Commonwealth and was last updated on 18 October 2026.
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Officers
5
The Director of Tesaro, Inc. currently on record is RICHARD RODGERS; five officers are currently on record for Tesaro, Inc., filed with Massachusetts Secretary of the Commonwealth.
The register reports 13 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.
Group Structure
Tesaro, Inc. sits 1 level below its ultimate parent, GSK PLC, registered in United Kingdom. 1 subsidiary is recorded beneath it, across 1 jurisdiction. The full chain up to GSK PLC is derived by walking shareholder filings across jurisdictions; no link in it is independently corroborated by Tesaro, Inc.'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 1 subsidiary spans United States jurisdiction, 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.
GSK PLC
United Kingdom
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Frequently Asked Questions
Who is Tesaro, Inc.'s UBO (Ultimate Beneficial Owner)?
No Ultimate Beneficial Owner (UBO) data is recorded for Tesaro, Inc.; access to beneficial-ownership data in this jurisdiction is governed by its own register rules.
What is Tesaro, Inc.'s company registration number?
Tesaro, Inc.'s registration number is 0332866, filed with Massachusetts Secretary of the Commonwealth in United States. Its current status on the register is active.
Is Tesaro, Inc. still an active company?
Tesaro, Inc.'s status on Massachusetts Secretary of the Commonwealth is listed as active.
What is Tesaro, Inc.'s registered address?
The registered address on file for Tesaro, Inc. is WALTHAM, United States.
What legal structure is Tesaro, Inc. registered as?
Tesaro, Inc. is registered as a Public Limited Company in United States.
Who are the officers/directors of Tesaro, Inc.?
The Director of Tesaro, Inc. currently on record is RICHARD RODGERS; five officers are currently on record for Tesaro, Inc., filed with Massachusetts Secretary of the Commonwealth.
Does Tesaro, Inc. have a parent company or subsidiaries?
Tesaro, Inc. sits 1 level below its ultimate parent, GSK PLC, registered in United Kingdom. 1 subsidiary is recorded beneath it, across 1 jurisdiction. Those 1 subsidiary spans United States jurisdiction, 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.
Can Zavia monitor changes to Tesaro, Inc.'s ownership over time?
This profile reflects a point-in-time snapshot from Massachusetts Secretary of the Commonwealth. Zavia's monitoring API can track changes to Tesaro, 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 Tesaro, 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 Tesaro, 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 Massachusetts Secretary of the Commonwealth and was last synced on 18 October 2026.