§ BIOTECHNOLOGY
USD · BiotechnologyPRTA
PROTHENA CORP PLC
USDSector · BiotechnologyBeta · -0.33
§ 01 · PRICE
Price action
1D5D1M6MYTD1YMAX
§ 03 · SIGNAL STACK · WHAT THE INPUTS SAY
13F FLOW
97 increased/new, 58 decreased/exited (13F)
AC 13F Analysis
§ 04 · FUNDAMENTALS · THE BOOKS
| P/B | 1.83 | EPS (TTM) | -0.83 |
§ 05 · WHO OWNS IT
Top institutional holders
| Fund | Shares | % port | Δ Q/Q |
|---|---|---|---|
| Fidelity Management | 7.6M | 0.0% | ±0% |
| Rubric Capital Management LP | 5.0M | 0.5% | +36% |
| BlackRock, Inc. | 4.6M | 0.0% | +13% |
| State Street | 1.9M | 0.0% | −15% |
| DE Shaw | 1.8M | 0.0% | +5% |
| ADAR1 Capital Management, LLC | 1.6M | 0.9% | n/a |
◇ AC INTELLIGENCE
Top institutional owners for PRTA as of the most recent 13F reporting period (Q1 2026 · Period ended Mar 31). Δ Q/Q reflects share-count change vs. the prior filing — positive green means adding, negative red means trimming. Cross-reference with the ownership-mix bars below to see which strategy cohort is driving the flow.
§ 06 · WHO OWNS IT · BY STRATEGY
OTHER10.1% · 0 holders
OTHER40.6% · 129 holders
QUALITY / COMPOUNDER19.8% · 11 holders
PASSIVE / INDEX11.6% · 7 holders
DEALER / BANK10.9% · 17 holders
ACTIVIST3.3% · 1 holder
SYSTEMATIC / QUANT2.2% · 7 holders
TACTICAL / MACRO1.2% · 3 holders
INCOME / DEFENSIVE0.2% · 9 holders
GROWTH / MOMENTUM0.1% · 1 holder
◇ AC INTELLIGENCE
Ownership mix by behavioral cohort. Top bars indicate which style of capital dominates the float — passive indexing, quality compounders, dealer/bank, systematic quant, etc. Big quality-compounder share means concentrated active conviction; heavy passive share means flows are dictated by index rebalances, not fundamentals.
§ 07 · INSIDER ACTIVITY · LAST 180 DAYS
NO INSIDER FILINGS
◇ AC INTELLIGENCE
No Form 4 filings on record for PRTA in the last 180 days.
§ 08 · COVERAGE · OUR RECENT NOTES
No notes mention PRTA yet.