Score Breakdown
Dilution Forecast
Market Data
Source-Backed Evidence Depth
This public preview uses stored DilutionWatch fields and linked SEC/market records only. Missing values are not estimated.
| Field | Current Value | Basis |
|---|---|---|
| DilutionScore | 38/100 | DilutionWatch score record |
| Shares Outstanding | 51.34M | Verified float table or market cache |
| Public Float | 36.75M | Verified float table or market cache |
| Market Cap | $432.77M | Market data cache |
| Cash Runway | 23.9 months | DilutionWatch score inputs |
| Shelf Capacity | None in current score inputs | SEC-derived dilution fields |
| ATM Capacity | None in current score inputs | SEC-derived dilution fields |
| Outstanding Warrants | None in current score inputs | SEC-derived dilution fields |
Recent source-backed SEC insight records available on this page: 5.
Recent SEC source mix: FORM 4 5.
The page does not infer future share issuance, financing probability, cash needs, management intent, or price impact when source fields are absent.
Institutional Holdings
Institutional holder totals are aggregated from ownership filings and may use a different share basis or reporting date than public float. They are not a reconciliation against tradeable float.
Short Interest
Recent SEC Activity
Recent News
Factual PRTA Dilution Snapshot
Prothena Corporation plc (PRTA) has a DilutionScore of 38/100, rated Medium dilution risk. Score date: October 13, 2026.
- Recent SEC activity tracked for PRTA: Form 4 on 2026-07-29; Form 4 on 2026-07-29; Form 4 on 2026-07-28.
This automatically generated snapshot is assembled from stored DilutionWatch data fields and may contain data-source errors or omissions. It is not financial advice, not investment research, and not a recommendation. Do your own research and review the full disclaimer and terms of service.
DilutionScore History — Last 90 Days
PRTA's DilutionScore is currently 38/100 (Medium risk), with 1 score change tracked over 89 days. The score improved from 33/100 (Medium risk).
| Period | Score | Risk Level | Duration |
|---|---|---|---|
| Aug 22 – Oct 13, 2026 | 38/100 | MEDIUM | 53 days |
| Jul 16 – Aug 21, 2026 | 33/100 | MEDIUM | 36 days |
Score recalculated daily from SEC filings and market data. Sign up free for real-time score change alerts.
Share Dilution History
PRTA shares outstanding have decreased 2.7% from 53.83M (Apr 2026) to 52.35M (May 2026). Each increase represents potential dilution to existing shareholders.
| Date | Shares Outstanding | Public Float | Change |
|---|---|---|---|
| May 18, 2026 | 52.35M | 36.75M | ▼ 3.47% |
| May 15, 2026 | 52.35M | 38.07M | ▼ 1.26% |
| May 10, 2026 | 52.35M | 38.56M | ▼ 2.75% |
| Apr 13, 2026 | 53.83M | 39.65M | ▼ 0.17% |
Share counts sourced from verified regulatory filings. Increases indicate dilution events.
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