PROTAGONIST THERAPEUTICS, INC.
PROTAGONIST THERAPEUTICS, INC. is a Public Limited Company registered in United States under 3107553, and its current status with California Secretary of State — bizfile Online is active. The company was incorporated on 5 February 2009 and lists its registered address as United States. 5 shareholders are on record for PROTAGONIST THERAPEUTICS, INC., 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 California Secretary of State — bizfile Online and was last updated on 25 September 2026.
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Shareholders
5
Shareholders of PROTAGONIST THERAPEUTICS, INC.
Five shareholders are currently on record for PROTAGONIST THERAPEUTICS, INC., 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 10.1% — the largest recorded stake — followed by UBS Group AG at 5.2%; the remaining 3 shareholders shown hold 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 | 10.1% | California Secretary of State — bizfile Online | |
| UBS Group AG | 5.2% | California Secretary of State — bizfile Online | |
| SPDR SERIES TRUST-State Street SPDR S&P Biotech ETF | 2.3% | California Secretary of State — bizfile Online | |
| Fidelity Salem Street Trust-Fidelity Small Cap Index Fund | 1.1% | California Secretary of State — bizfile Online | |
| iShares Trust-iShares Russell 2000 Growth ETF | 1% | California Secretary of State — bizfile Online |
Officers
19
Directors and officers of PROTAGONIST THERAPEUTICS, INC.
The Ceo, President, Secretary & Director of PROTAGONIST THERAPEUTICS, INC. currently on record is Dinesh V. Patel Ph.d.; 19 officers are currently on record for PROTAGONIST THERAPEUTICS, INC., filed with California Secretary of State — bizfile Online. Management authority at PROTAGONIST THERAPEUTICS, INC. 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.
Data availability
The register reports 20 officers in total, including past appointments, though only the 19 most relevant records are shown here.
Group Structure
Group structure of PROTAGONIST THERAPEUTICS, INC.
PROTAGONIST THERAPEUTICS, INC. has no recorded parent company — it sits at the top of its own group structure, with 1 subsidiary recorded beneath it across 2 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.
- PROTAGONIST PTY LIMITED (Australia)
Data availability
Those 1 subsidiary spans United States, Australia 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.
PROTAGONIST THERAPEUTICS, INC.
United States
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Frequently Asked Questions
Who owns PROTAGONIST THERAPEUTICS, INC.?
Five shareholders are currently on record for PROTAGONIST THERAPEUTICS, INC., 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 10.1% — the largest recorded stake — followed by UBS Group AG at 5.2%; the remaining 3 shareholders shown hold 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 PROTAGONIST THERAPEUTICS, INC.'s UBO (Ultimate Beneficial Owner)?
Every shareholder recorded for PROTAGONIST THERAPEUTICS, INC. 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 PROTAGONIST THERAPEUTICS, INC. have on record?
5 shareholders are shown on record for PROTAGONIST THERAPEUTICS, INC..
What is PROTAGONIST THERAPEUTICS, INC.'s company registration number?
PROTAGONIST THERAPEUTICS, INC.'s registration number is 3107553, filed with California Secretary of State — bizfile Online in United States. Its current status on the register is active.
Is PROTAGONIST THERAPEUTICS, INC. still an active company?
PROTAGONIST THERAPEUTICS, INC.'s status on California Secretary of State — bizfile Online is listed as active.
When was PROTAGONIST THERAPEUTICS, INC. incorporated?
PROTAGONIST THERAPEUTICS, INC. was incorporated on 5 February 2009, according to California Secretary of State — bizfile Online.
What is PROTAGONIST THERAPEUTICS, INC.'s registered address?
The registered address on file for PROTAGONIST THERAPEUTICS, INC. is United States.
What legal structure is PROTAGONIST THERAPEUTICS, INC. registered as?
PROTAGONIST THERAPEUTICS, INC. is registered as a Public Limited Company in United States.
Who are the officers/directors of PROTAGONIST THERAPEUTICS, INC.?
The Ceo, President, Secretary & Director of PROTAGONIST THERAPEUTICS, INC. currently on record is Dinesh V. Patel Ph.d.; 19 officers are currently on record for PROTAGONIST THERAPEUTICS, INC., filed with California Secretary of State — bizfile Online. Management authority at PROTAGONIST THERAPEUTICS, INC. sits with these individuals, not with shareholders, who are covered separately and hold ownership rather than control.
Does PROTAGONIST THERAPEUTICS, INC. have a parent company or subsidiaries?
PROTAGONIST THERAPEUTICS, INC. has no recorded parent company — it sits at the top of its own group structure, with 1 subsidiary recorded beneath it across 2 jurisdictions. Those 1 subsidiary spans United States, Australia 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.
Can Zavia monitor changes to PROTAGONIST THERAPEUTICS, INC.'s ownership over time?
This profile reflects a point-in-time snapshot from California Secretary of State — bizfile Online. Zavia's monitoring API can track changes to PROTAGONIST THERAPEUTICS, 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 PROTAGONIST THERAPEUTICS, 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 PROTAGONIST THERAPEUTICS, 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 California Secretary of State — bizfile Online and was last synced on 25 September 2026.