Ticker Short Interest
PRTA Short Interest Intelligence
Prothena Corporation plc positioning pressure, squeeze risk, bearish conviction, crowding, days to cover, and price-positioning divergence.
Positioning Divergence
Shorts Under Pressure
PRTA is classified as Positioning Divergence. Latest reported short interest is 8.4M shares; short interest changed +6.4%, price moved +21.5% since the previous report, short interest is in the 100th percentile, and days to cover is in the 14th percentile. Trend context is mixed.
Reported Short Interest
2026-03-31 to 2026-06-30Days To Cover
liquidity pressureShort Interest Change
report-to-reportPrice Context
2026-03-20 to 2026-06-26Squeeze Radar
56Elevated short interest becomes most interesting when price strength forces shorts to defend or cover.
Bearish Conviction
34Rising short interest alongside weak trend can mean the bearish trade is being reinforced, not trapped.
Crowding
61Latest short interest is 8.4M shares and days to cover is 11.02.
Divergence
56Short interest rose while price rose. Bearish positioning is adding into strength, which can create squeeze pressure if the chart keeps improving.
Report History
PRTA Short Interest Ledger
| Settlement | Short interest | Previous | Change | Days cover | Average volume |
|---|---|---|---|---|---|
| 30 Jun 2026 | 8369568 | 7866857 | 6.4% | 11.02 | 759430 |
| 15 Jun 2026 | 7866857 | 7737902 | 1.7% | 15.98 | 492334 |
| 29 May 2026 | 7737902 | 7097854 | 9.0% | 13.85 | 558736 |
| 15 May 2026 | 7097854 | 6871465 | 3.3% | 12.96 | 547700 |
| 30 Apr 2026 | 6871465 | 7076832 | -2.9% | 18.33 | 374817 |
| 15 Apr 2026 | 7076832 | 7016080 | 0.9% | 15.33 | 461513 |
| 31 Mar 2026 | 7016080 | 7044790 | -0.4% | 12.32 | 569553 |
Short interest is delayed, reported on a periodic schedule, and may be revised. The dashboard is research context only and does not prove real-time short activity.