PHIO PHARMACEUTICALS CORP.
PHIO PHARMACEUTICALS CORP. is a Public Limited Company registered in United States under 453215903, and its current status with Massachusetts Secretary of the Commonwealth is inactive. The company was incorporated on 13 September 2011 and lists its registered address as United States. 3 shareholders are on record for PHIO PHARMACEUTICALS CORP., 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 Massachusetts Secretary of the Commonwealth and was last updated on 4 October 2026.
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Shareholders
3
Three shareholders are currently on record for PHIO PHARMACEUTICALS CORP., 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 Fidelity Concord Street Trust-Fidelity Extended Market Index Fund, holding 8.9% — the largest recorded stake — followed by Fidelity Concord Street Trust-Fidelity Series Total Market Index Fund at 1.8%; 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 |
|---|---|---|---|
| Fidelity Concord Street Trust-Fidelity Extended Market Index Fund | 8.9% | Massachusetts Secretary of the Commonwealth | |
| Fidelity Concord Street Trust-Fidelity Series Total Market Index Fund | 1.8% | Massachusetts Secretary of the Commonwealth | |
| DFA INVESTMENT DIMENSIONS GROUP INC-U.S. Small Cap Portfolio | 0.1% | Massachusetts Secretary of the Commonwealth |
Officers
5
The President, Ceo & Chairman of PHIO PHARMACEUTICALS CORP. currently on record is Robert J. Bitterman; five officers are currently on record for PHIO PHARMACEUTICALS CORP., filed with Massachusetts Secretary of the Commonwealth.
The register reports 25 officers in total, including past appointments, though only the 5 most relevant records are shown here.
Management authority at PHIO PHARMACEUTICALS CORP. 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
PHIO PHARMACEUTICALS CORP. 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.
PHIO PHARMACEUTICALS CORP.
United States
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Frequently Asked Questions
Who owns PHIO PHARMACEUTICALS CORP.?
Three shareholders are currently on record for PHIO PHARMACEUTICALS CORP., 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 Fidelity Concord Street Trust-Fidelity Extended Market Index Fund, holding 8.9% — the largest recorded stake — followed by Fidelity Concord Street Trust-Fidelity Series Total Market Index Fund at 1.8%; 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 PHIO PHARMACEUTICALS CORP.'s UBO (Ultimate Beneficial Owner)?
Every shareholder recorded for PHIO PHARMACEUTICALS CORP. 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 PHIO PHARMACEUTICALS CORP. have on record?
3 shareholders are shown on record for PHIO PHARMACEUTICALS CORP..
What is PHIO PHARMACEUTICALS CORP.'s company registration number?
PHIO PHARMACEUTICALS CORP.'s registration number is 453215903, filed with Massachusetts Secretary of the Commonwealth in United States. Its current status on the register is inactive.
Is PHIO PHARMACEUTICALS CORP. still an active company?
PHIO PHARMACEUTICALS CORP.'s status on Massachusetts Secretary of the Commonwealth is listed as inactive, not currently active.
When was PHIO PHARMACEUTICALS CORP. incorporated?
PHIO PHARMACEUTICALS CORP. was incorporated on 13 September 2011, according to Massachusetts Secretary of the Commonwealth.
What is PHIO PHARMACEUTICALS CORP.'s registered address?
The registered address on file for PHIO PHARMACEUTICALS CORP. is United States.
What legal structure is PHIO PHARMACEUTICALS CORP. registered as?
PHIO PHARMACEUTICALS CORP. is registered as a Public Limited Company in United States.
Who are the officers/directors of PHIO PHARMACEUTICALS CORP.?
The President, Ceo & Chairman of PHIO PHARMACEUTICALS CORP. currently on record is Robert J. Bitterman; five officers are currently on record for PHIO PHARMACEUTICALS CORP., filed with Massachusetts Secretary of the Commonwealth. Management authority at PHIO PHARMACEUTICALS CORP. sits with these individuals, not with shareholders, who are covered separately and hold ownership rather than control.
Does PHIO PHARMACEUTICALS CORP. have a parent company or subsidiaries?
PHIO PHARMACEUTICALS CORP. 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 PHIO PHARMACEUTICALS CORP.'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 PHIO PHARMACEUTICALS CORP.'s registered shareholders, officers, and group structure going forward, flagging updates as they're filed rather than requiring a manual recheck.
Can I access PHIO PHARMACEUTICALS CORP.'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 PHIO PHARMACEUTICALS CORP.'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 4 October 2026.