PROTHENA BIOSCIENCES LIMITED
PROTHENA BIOSCIENCES LIMITED is a Private limited company (Ltd.) registered in Ireland under IE460227, and its current status with Companies Registration Office (CRO) is active. The company was incorporated on 22 July 2008 and lists its registered address as Ireland. 1 shareholder is on record for PROTHENA BIOSCIENCES LIMITED, 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 Companies Registration Office (CRO) and was last updated on 27 October 2026.
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Shareholders
1
One shareholder is currently on record for PROTHENA BIOSCIENCES LIMITED, held on the Annual Return (Form B1) under section 342 of the Companies Act 2014, which the register supplies only on payment.
The largest of these is PROTHENA CORPORATION PUBLIC LIMITED COMPANY, holding 100% — a majority holding.
Because the 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 |
|---|---|---|---|
| PROTHENA CORPORATION PUBLIC LIMITED COMPANY | 100% | Companies Registration Office (CRO) |
Officers
5
Four of the 5 officer records shown for PROTHENA BIOSCIENCES LIMITED are current appointments, filed with Companies Registration Office (CRO). YVONNE TCHRAKIAN (appointed 2014-03-11) and GENE KINNEY (appointed 2016-09-30) both serve as Director; YVONNE TCHRAKIAN (appointed 2014-01-30) and NINA ASHTON (appointed 2017-07-13) both serve as Company Secretary. The remaining 1 record shown (DALE SCHENK) is a former appointment that has since been resigned.
The register reports 12 officers in total, including past appointments, though only the 5 most relevant records are shown here.
Management authority at PROTHENA BIOSCIENCES LIMITED 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
PROTHENA BIOSCIENCES LIMITED sits 1 level below its ultimate parent, PROTHENA CORPORATION PUBLIC LIMITED COMPANY, registered in Ireland. 3 subsidiaries are recorded beneath it, across 1 jurisdiction. Immediately above PROTHENA BIOSCIENCES LIMITED is PROTHENA CORPORATION PUBLIC LIMITED COMPANY, holding 100% as filed in PROTHENA BIOSCIENCES LIMITED's own shareholder record with Companies Registration Office (CRO). 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 Ireland 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.
PROTHENA CORPORATION PUBLIC LIMITED COMPANY
Ireland
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Frequently Asked Questions
Who owns PROTHENA BIOSCIENCES LIMITED?
One shareholder is currently on record for PROTHENA BIOSCIENCES LIMITED, held on the Annual Return (Form B1) under section 342 of the Companies Act 2014, which the register supplies only on payment. The largest of these is PROTHENA CORPORATION PUBLIC LIMITED COMPANY, holding 100% — a majority holding. Because the 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 PROTHENA BIOSCIENCES LIMITED's UBO (Ultimate Beneficial Owner)?
Every shareholder recorded for PROTHENA BIOSCIENCES LIMITED 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 PROTHENA BIOSCIENCES LIMITED have on record?
1 shareholder is shown on record for PROTHENA BIOSCIENCES LIMITED.
What is PROTHENA BIOSCIENCES LIMITED's company registration number?
PROTHENA BIOSCIENCES LIMITED's registration number is IE460227, filed with Companies Registration Office (CRO) in Ireland. Its current status on the register is active.
Is PROTHENA BIOSCIENCES LIMITED still an active company?
PROTHENA BIOSCIENCES LIMITED's status on Companies Registration Office (CRO) is listed as active.
When was PROTHENA BIOSCIENCES LIMITED incorporated?
PROTHENA BIOSCIENCES LIMITED was incorporated on 22 July 2008, according to Companies Registration Office (CRO).
What is PROTHENA BIOSCIENCES LIMITED's registered address?
The registered address on file for PROTHENA BIOSCIENCES LIMITED is Ireland.
What legal structure is PROTHENA BIOSCIENCES LIMITED registered as?
PROTHENA BIOSCIENCES LIMITED is registered as a Private limited company (Ltd.) in Ireland.
Who are the officers/directors of PROTHENA BIOSCIENCES LIMITED?
Four of the 5 officer records shown for PROTHENA BIOSCIENCES LIMITED are current appointments, filed with Companies Registration Office (CRO). YVONNE TCHRAKIAN (appointed 2014-03-11) and GENE KINNEY (appointed 2016-09-30) both serve as Director; YVONNE TCHRAKIAN (appointed 2014-01-30) and NINA ASHTON (appointed 2017-07-13) both serve as Company Secretary. The remaining 1 record shown (DALE SCHENK) is a former appointment that has since been resigned. Management authority at PROTHENA BIOSCIENCES LIMITED sits with these individuals, not with shareholders, who are covered separately and hold ownership rather than control.
Does PROTHENA BIOSCIENCES LIMITED have a parent company or subsidiaries?
PROTHENA BIOSCIENCES LIMITED sits 1 level below its ultimate parent, PROTHENA CORPORATION PUBLIC LIMITED COMPANY, registered in Ireland. 3 subsidiaries are recorded beneath it, across 1 jurisdiction. Those 3 subsidiaries span Ireland 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 PROTHENA BIOSCIENCES LIMITED's ownership over time?
This profile reflects a point-in-time snapshot from Companies Registration Office (CRO). Zavia's monitoring API can track changes to PROTHENA BIOSCIENCES LIMITED's registered shareholders, officers, and group structure going forward, flagging updates as they're filed rather than requiring a manual recheck.
Can I access PROTHENA BIOSCIENCES LIMITED's data through an API?
Yes. Zavia's API connects directly to official government ownership registries across 195 countries and territories, including Ireland, so records like PROTHENA BIOSCIENCES LIMITED'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 Companies Registration Office (CRO) and was last synced on 27 October 2026.