X4 PHARMACEUTICALS, INC.
X4 PHARMACEUTICALS, INC. is a registered legal entity registered in United States under 4851982, and its current status with Delaware Division of Corporations is active. The company was incorporated on 8 February 2010 and lists its registered address as United States. 3 shareholders are on record for X4 PHARMACEUTICALS, 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 Delaware Division of Corporations and was last updated on 4 October 2026.
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Shareholders
3
Three shareholders are currently on record for X4 PHARMACEUTICALS, 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 Acorn Capital Advisors, LLC , holding 23.4% — the largest recorded stake — followed by Vanguard Group Inc at 12.8%; 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 |
|---|---|---|---|
| Acorn Capital Advisors, LLC | 23.4% | Delaware Division of Corporations | |
| Vanguard Group Inc | 12.8% | Delaware Division of Corporations | |
| Acorn Capital Advisors, LLC | 0.8% | Delaware Division of Corporations |
Officers
5
The Chief Medical Officer of X4 PHARMACEUTICALS, INC. currently on record is Christophe Arbet-engels M.b.a., M.d., Ph.d.; five officers are currently on record for X4 PHARMACEUTICALS, INC., filed with Delaware Division of Corporations.
The register reports 15 officers in total, including past appointments, though only the 5 most relevant records are shown here.
Management authority at X4 PHARMACEUTICALS, 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
X4 PHARMACEUTICALS, INC. has no recorded parent company — it sits at the top of its own group structure, with 3 subsidiaries 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.
Those 3 subsidiaries span United States, Austria 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.
X4 PHARMACEUTICALS, INC.
United States
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Frequently Asked Questions
Who owns X4 PHARMACEUTICALS, INC.?
Three shareholders are currently on record for X4 PHARMACEUTICALS, 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 Acorn Capital Advisors, LLC , holding 23.4% — the largest recorded stake — followed by Vanguard Group Inc at 12.8%; 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 X4 PHARMACEUTICALS, INC.'s UBO (Ultimate Beneficial Owner)?
Every shareholder recorded for X4 PHARMACEUTICALS, 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 X4 PHARMACEUTICALS, INC. have on record?
3 shareholders are shown on record for X4 PHARMACEUTICALS, INC..
What is X4 PHARMACEUTICALS, INC.'s company registration number?
X4 PHARMACEUTICALS, INC.'s registration number is 4851982, filed with Delaware Division of Corporations in United States. Its current status on the register is active.
Is X4 PHARMACEUTICALS, INC. still an active company?
X4 PHARMACEUTICALS, INC.'s status on Delaware Division of Corporations is listed as active.
When was X4 PHARMACEUTICALS, INC. incorporated?
X4 PHARMACEUTICALS, INC. was incorporated on 8 February 2010, according to Delaware Division of Corporations.
What is X4 PHARMACEUTICALS, INC.'s registered address?
The registered address on file for X4 PHARMACEUTICALS, INC. is United States.
Who are the officers/directors of X4 PHARMACEUTICALS, INC.?
The Chief Medical Officer of X4 PHARMACEUTICALS, INC. currently on record is Christophe Arbet-engels M.b.a., M.d., Ph.d.; five officers are currently on record for X4 PHARMACEUTICALS, INC., filed with Delaware Division of Corporations. Management authority at X4 PHARMACEUTICALS, INC. sits with these individuals, not with shareholders, who are covered separately and hold ownership rather than control.
Does X4 PHARMACEUTICALS, INC. have a parent company or subsidiaries?
X4 PHARMACEUTICALS, INC. has no recorded parent company — it sits at the top of its own group structure, with 3 subsidiaries recorded beneath it across 2 jurisdictions. Those 3 subsidiaries span United States, Austria 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 X4 PHARMACEUTICALS, INC.'s ownership over time?
This profile reflects a point-in-time snapshot from Delaware Division of Corporations. Zavia's monitoring API can track changes to X4 PHARMACEUTICALS, 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 X4 PHARMACEUTICALS, 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 X4 PHARMACEUTICALS, 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 Delaware Division of Corporations and was last synced on 4 October 2026.