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PRTA · Prothena Corp Public Ltd Co

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$8.86 -0.22 (-2.42%) At close · Aug 14
Market Cap
$454.85M
Shares
51.34M

Shares sold short and not yet covered, reported twice monthly. Days to cover is the reported short position divided by average daily volume.

Model estimate

Expected Aug 14 short interest

as of Aug 14
8,375,360 +2.5% vs reported
The latest estimate appears in the chart below. Official release expected Aug 25. Methodology
Short Squeeze Score
63/100
Short interest 15.9% of shares — P96 Days to cover 14.0 — P94 Price vs VWAP -2.5% — P36 Short-volume trend -11.4% — P15 Short interest change -0.3% — P52 Worst FTD 0.00% of shares — P21

Peer-relative percentile rank across all stocks reporting short interest at the latest settlement date (2026-07-31). Weighted mean of the available factors (short interest 30%, days to cover 20%, price vs VWAP 15%, short-volume trend 15%, short-interest change 10%, fails-to-deliver 10%) plus catalyst boosts (price spike, volume surge, earnings within days), capped at +20 and clamped to 100.

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    • Short Interest History

    Settlement Date Current Position Previous Position Change Days to Cover
    2026-08-31 Scheduled
    FINRA publishes Sep 10
    		 — — — —
    2026-08-14 Scheduled
    FINRA publishes Aug 25
    		 — — — —
    2026-07-31 8,172,438 8,196,964 -24,526 13.96
    2026-07-15 8,196,964 8,369,568 -172,604 16.40
    2026-06-30 8,369,568 7,866,857 +502,711 11.02
    2026-06-15 7,866,857 7,737,902 +128,955 15.98
    2026-05-29 7,737,902 7,097,854 +640,048 13.85
    2026-05-15 7,097,854 6,871,465 +226,389 12.96
    2026-04-30 6,871,465 7,076,832 -205,367 18.33
    2026-04-15 7,076,832 7,016,080 +60,752 15.33
    2026-03-31 7,016,080 7,044,790 -28,710 12.32
    2026-03-13 7,044,790 6,854,767 +190,023 11.20
    2026-02-27 6,854,767 7,083,043 -228,276 17.22
    2026-02-13 7,083,043 7,063,694 +19,349 18.12
    2026-01-30 7,063,694 7,069,471 -5,777 13.90
    2026-01-15 7,069,471 6,584,532 +484,939 14.42
    2025-12-31 6,584,532 4,699,126 +1,885,406 7.96
    2025-12-15 4,699,126 4,639,338 +59,788 6.78
    2025-11-28 4,639,338 4,657,490 -18,152 9.02
    2025-11-14 4,657,490 4,144,115 +513,375 7.38
    2025-10-31 4,144,115 3,857,015 +287,100 8.06
    2025-10-15 3,857,015 3,845,694 +11,321 5.37
    2025-09-30 3,845,694 3,763,878 +81,816 5.03
    2025-09-15 3,763,878 4,055,435 -291,557 4.53
    2025-08-29 4,055,435 4,184,841 -129,406 3.89
    Showing 1–23 of 23 settlements
    Key facts CIK 1559053 CUSIP G72800108 13F (30d) 181 filings 177 filers Visit website Investor relations

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