PRTA Institutional Ownership
PROTHENA CORP PLC
Latest close $8.76 as of Aug 7, 2026
PRTA institutional ownership at a glance
Follow PROTHENA CORP PLC institutional ownership through recent Schedule 13G and 13D filings. Compare reported shares, ownership percentages, filing dates, and changes in beneficial ownership over time.
Latest filing: Fidelity / FMR filed Schedule 13G amendment on Aug 6, 2026, reporting 7.2M shares and 13.80% beneficial ownership.
How to read Schedule 13 ownership changes
Schedule 13G/13D reports beneficial ownership at an observation date. “Accumulation” or “reduction” is inferred from changes in reported shares when available; it is not a list of individual trades or exact execution prices.
Form 13F rows are quarter-end holding context only and do not establish an exact entry date.
For more context, see how to read a Schedule 13G, filing date vs event date, or Schedule 13G vs Schedule 13D.
Institutional Research
This gauge summarizes recent agreement across tracked institutional activity.
1 accumulating, 1 reducing across 2 comparable institutions.
The overall consensus is public. Detailed holder comparisons, breadth history, ownership charts, and filing-specific signal analysis remain part of Investor and Pro research.
Price context
52-week position is market context and does not change the institutional consensus score.
Tracked institutions
Public holder names and filing freshness. Detailed institution-by-institution analysis is locked.
Beneficial ownership filing history
Showing 3 of 8 filing(s) · 5 older require more history access| Holder | Observed / filed | Reported change | Shares | Ownership | Observation | Filing | Latest |
|---|---|---|---|---|---|---|---|
| Fidelity / FMR CIK0000315066 | Jun 30, 2026 observed Aug 6, 2026 filed · 37d Schedule 13G amendment | Earliest Schedule 13G amendment found | 7.2M | 13.80% | $9.79 | $8.58 | $8.76 |
| BlackRock CIK0002012383 | Jun 30, 2026 observed Jul 29, 2026 filed · 29d Schedule 13G amendment | Reported accumulation | 3.6M +495.2K | 12.00% 0.00 pts | $9.79 | $8.56 | $8.76 |
| BlackRock CIK0002012383 | Sep 30, 2025 observed Oct 17, 2025 filed · 17d Schedule 13G amendment | Earliest Schedule 13G amendment found | 3.1M | 12.00% | $9.76 | $9.92 | $8.76 |
Related research
Compare PRTA with other securities showing similar institutional activity or recent accumulation across several tracked institutions.