PRTA US Equity
Prothena Corp Public Ltd CoHealth Care · Pharmaceutical Preparations · CIK 1559053 · FY ends Dec 31$9.45
+0.42 (+4.65%)
USD · as of 2026-08-21 · marketstack
Short interest· FINRA consolidated · settlement 2026-07-31
6 settlement cycles| Shares short | 8.2M |
| % of shares out | 15.9% |
| Days to cover | 14.0 |
| Δ vs 2026-07-15 | -0.3% |
bars = shares short · line = days to cover (own scale)
| Settlement | Shares short | Δ vs prior | Avg daily volume | Days to cover |
|---|
| 2026-07-31 | 8,172,438 | -0.3% | 585,253 | 14.0 |
| 2026-07-15 | 8,196,964 | -2.1% | 499,741 | 16.4 |
| 2026-06-30 | 8,369,568 | +6.4% | 759,430 | 11.0 |
| 2026-06-15 | 7,866,857 | +1.7% | 492,334 | 16.0 |
| 2026-05-29 | 7,737,902 | +9.0% | 558,736 | 13.8 |
| 2026-05-15 | 7,097,854 | +3.3% | 547,700 | 13.0 |
FINRA Rule 4560 · twice monthly, published ~a week later.
Output of a disclosed model — assumptions may be wrong. Research, not investment advice. See the Disclaimer.
