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PTCT · Ptc Therapeutics, Inc.

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$69.30 -2.10 (-2.94%) At close · Sep 4
S&P 600 member Russell 2000 member Rebalance outlook locked
Customer concentration — top 4 customers 10% of revenue

4 customers — 10% of revenue (2025)

“During 2025, four of our distributors each accounted for over 10% of our net product sales.”
View the 10-K filed Feb 19, 2026
Market Cap
$5.96B
Shares
83.46M

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

PTCT Latest Reported Short Interest

FINRA reported 10,221,046 PTCT shares sold short as of the August 14, 2026 settlement date, a decrease of 345,203 shares. Days to cover was 10.82 based on FINRA's reported average daily volume.

Official FINRA short-interest data · share counts are restated for subsequent splits of this listing

PTCT Short Interest Forecast

Equibles' model estimates 10,122,973 shares sold short for the August 31, 2026 settlement, -1.0% versus the latest reported position, with a likely range of 9,192,363 to 11,036,878 shares. This model prediction uses FINRA data through August 31, 2026; FINRA's official release is expected September 10, 2026.

Model estimate

Expected Aug 31 short interest

as of Aug 31 Medium confidence 68% chance it falls
10,122,973 -1.0% vs reported
Likely range 9,192,363 to 11,036,878 The latest estimate appears in the chart below. Official release expected Sep 10. Methodology
Short Squeeze Score
73/100
Short interest 12.2% of shares — P93 Days to cover 10.8 — P91 Price vs VWAP -10.6% — P22 Short-volume trend +3.8% — P65 Short interest change -3.3% — P41 Worst FTD 0.45% of shares — P93

Peer-relative percentile rank across all listed securities reporting short interest at the latest settlement date (2026-08-14). 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
    2026-09-15 Scheduled
    FINRA publishes Sep 24
    		 — — — —
    2026-08-31 Scheduled
    FINRA publishes Sep 10
    		 — — — —
    2026-08-14 10,221,046 10,566,249 -345,203 10.82
    2026-07-31 10,566,249 9,833,980 +732,269 7.52
    2026-07-15 9,833,980 17,315,032 -7,481,052 4.75
    2026-06-30 17,315,032 11,783,786 +5,531,246 5.36
    2026-06-15 11,783,786 10,674,185 +1,109,601 7.82
    2026-05-29 10,674,185 10,240,784 +433,401 11.08
    2026-05-15 10,240,784 9,756,300 +484,484 5.99
    2026-04-30 9,756,300 8,547,862 +1,208,438 7.44
    2026-04-15 8,547,862 9,452,081 -904,219 10.61
    2026-03-31 9,452,081 8,847,565 +604,516 8.41
    2026-03-13 8,847,565 9,616,593 -769,028 6.96
    2026-02-27 9,616,593 9,591,953 +24,640 8.13
    2026-02-13 9,591,953 10,081,569 -489,616 8.99
    2026-01-30 10,081,569 10,290,419 -208,850 9.35
    2026-01-15 10,290,419 10,709,685 -419,266 6.24
    2025-12-31 10,709,685 11,442,932 -733,247 10.03
    2025-12-15 11,442,932 12,859,294 -1,416,362 7.54
    2025-11-28 12,859,294 9,418,915 +3,440,379 4.10
    2025-11-14 9,418,915 8,337,064 +1,081,851 6.34
    2025-10-31 8,337,064 7,816,416 +520,648 9.96
    2025-10-15 7,816,416 7,136,920 +679,496 6.39
    2025-09-30 7,136,920 7,292,929 -156,009 5.81
    2025-09-15 7,292,929 6,643,065 +649,864 4.82

    Full FINRA short interest reporting calendar

    Showing 1–23 of 23 settlements
    Key facts CIK 1070081 CUSIP 69366J200 13F (30d) 266 filings 263 filers Visit website Investor relations