SIENNA BIOPHARMACEUTICALS, INC.
SIENNA BIOPHARMACEUTICALS, INC. is a registered legal entity registered in United States under 3251580, and its current status with California Secretary of State — bizfile Online is inactive. The company was incorporated on 1 September 2010 and lists its registered address as WESTLAKE VILLAGE, United States. 4 shareholders are on record for SIENNA BIOPHARMACEUTICALS, 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 10 October 2026.
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Shareholders
4
Four shareholders are currently on record for SIENNA BIOPHARMACEUTICALS, INC., reflecting the stock ledger kept by the company under state corporate law (e.g. §219 of the Delaware General Corporation Law) rather than a public filing.
The largest of these is Fidelity Growth Company Fund, holding 38.5% — the largest recorded stake — followed by Fidelity Mt. Vernon Street Trust-Fidelity Growth Company Fund at 35.6%; the remaining 2 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 |
|---|---|---|---|
| Fidelity Growth Company Fund | 38.5% | California Secretary of State — bizfile Online | |
| Fidelity Mt. Vernon Street Trust-Fidelity Growth Company Fund | 35.6% | California Secretary of State — bizfile Online | |
| Fidelity Mt. Vernon Street Trust-Fidelity Series Growth Company Fund | 15.6% | California Secretary of State — bizfile Online | |
| Fidelity Mt. Vernon Street Trust-Fidelity Growth Company K6 Fund | 10.1% | California Secretary of State — bizfile Online |
Officers
5
The Strategic Advisor To The Board And Ceo of SIENNA BIOPHARMACEUTICALS, INC. currently on record is David E. I. Pyott M.a., M.b.a., M.d.; five officers are currently on record for SIENNA BIOPHARMACEUTICALS, INC., filed with California Secretary of State — bizfile Online.
The register reports 12 officers in total, including past appointments, though only the 5 most relevant records are shown here.
Management authority at SIENNA BIOPHARMACEUTICALS, 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.
Group Structure
SIENNA BIOPHARMACEUTICALS, INC. has no recorded parent company — it sits at the top of its own group structure, with 1 subsidiary recorded beneath it across 1 jurisdiction. 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.
SIENNA BIOPHARMACEUTICALS, INC.
United States
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Frequently Asked Questions
Who owns SIENNA BIOPHARMACEUTICALS, INC.?
Four shareholders are currently on record for SIENNA BIOPHARMACEUTICALS, INC., reflecting the stock ledger kept by the company under state corporate law (e.g. §219 of the Delaware General Corporation Law) rather than a public filing. The largest of these is Fidelity Growth Company Fund, holding 38.5% — the largest recorded stake — followed by Fidelity Mt. Vernon Street Trust-Fidelity Growth Company Fund at 35.6%; the remaining 2 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 SIENNA BIOPHARMACEUTICALS, INC.'s UBO (Ultimate Beneficial Owner)?
Every shareholder recorded for SIENNA BIOPHARMACEUTICALS, 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 SIENNA BIOPHARMACEUTICALS, INC. have on record?
4 shareholders are shown on record for SIENNA BIOPHARMACEUTICALS, INC..
What is SIENNA BIOPHARMACEUTICALS, INC.'s company registration number?
SIENNA BIOPHARMACEUTICALS, INC.'s registration number is 3251580, filed with California Secretary of State — bizfile Online in United States. Its current status on the register is inactive.
Is SIENNA BIOPHARMACEUTICALS, INC. still an active company?
SIENNA BIOPHARMACEUTICALS, INC.'s status on California Secretary of State — bizfile Online is listed as inactive, not currently active.
When was SIENNA BIOPHARMACEUTICALS, INC. incorporated?
SIENNA BIOPHARMACEUTICALS, INC. was incorporated on 1 September 2010, according to California Secretary of State — bizfile Online.
What is SIENNA BIOPHARMACEUTICALS, INC.'s registered address?
The registered address on file for SIENNA BIOPHARMACEUTICALS, INC. is WESTLAKE VILLAGE, United States.
Who are the officers/directors of SIENNA BIOPHARMACEUTICALS, INC.?
The Strategic Advisor To The Board And Ceo of SIENNA BIOPHARMACEUTICALS, INC. currently on record is David E. I. Pyott M.a., M.b.a., M.d.; five officers are currently on record for SIENNA BIOPHARMACEUTICALS, INC., filed with California Secretary of State — bizfile Online. Management authority at SIENNA BIOPHARMACEUTICALS, INC. sits with these individuals, not with shareholders, who are covered separately and hold ownership rather than control.
Does SIENNA BIOPHARMACEUTICALS, INC. have a parent company or subsidiaries?
SIENNA BIOPHARMACEUTICALS, INC. has no recorded parent company — it sits at the top of its own group structure, with 1 subsidiary 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 SIENNA BIOPHARMACEUTICALS, 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 SIENNA BIOPHARMACEUTICALS, 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 SIENNA BIOPHARMACEUTICALS, 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 SIENNA BIOPHARMACEUTICALS, 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 10 October 2026.