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INSM · INSMED Inc · Short Interest

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$114.14 -1.49 (-1.29%) At close · Sep 30
Russell 1000 member Rebalance outlook locked
Market Cap
$25.73B
Shares
218.38M
Volume · Sep 30 2.87M Avg daily vol (3M) 2.45M

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

Pull short interest history through the short interest API or MCP →

INSM Latest Reported Short Interest

FINRA reported 10,802,070 INSM shares sold short as of the September 15, 2026 settlement date, a decrease of 638,106 shares. Days to cover was 5.27 based on FINRA's reported average daily volume.

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

INSM Short Interest Forecast

Equibles' model estimates 10,957,883 shares sold short for the September 30, 2026 settlement, +1.4% versus the latest reported position, with a likely range of 9,624,989 to 12,421,460 shares. This model prediction uses FINRA data through September 30, 2026; FINRA's official release is expected October 9, 2026.

Model estimate

Expected Sep 30 short interest

as of Sep 30 Low confidence 51% chance it rises
10,957,883 +1.4% vs reported
Likely range 9,624,989 to 12,421,460 The latest estimate appears in the chart below. Official release expected Oct 9. Methodology
Short Squeeze Score
62/100
Short interest 4.9% of shares — P71 Days to cover 5.3 — P66 Price vs VWAP -2.9% — P63 Short-volume trend +4.7% — P65 Short interest change -5.6% — P27 Worst FTD 0.01% of shares — P51

Positioning score 61.7 + catalyst boost 0 (total capped at 100). This is a screening index, not a probability of a squeeze.

Method and coverage limits

Factor percentiles compare eligible primary operating-company stocks reporting short interest at the latest settlement date (2026-09-15). The weighted mean uses short interest 30%, days to cover 20%, price vs VWAP 15%, short-volume trend 15%, short-interest change 10%, and fails-to-deliver 10%. Missing factors redistribute their weight; incomplete coverage is not evidence of low risk. Price, volume, and earnings boosts add 10 each, capped at 20.

Shares outstanding are not free float. Borrow fees, utilization, lendable supply, recalls, and dealer inventory are not measured. Short-sale volume does not measure the change in open shorts; fails to deliver are not a borrow-cost measurement; price vs VWAP does not establish short sellers' entry prices. Earnings can move prices in either direction.

The weights are judgment-based, not calibrated to future squeeze outcomes. The separate options assessment below does not change this universe ranking.

Options positioning & squeeze sensitivity

Nearest expiration after today within 30 calendar days; same-day expirations and later maturities are excluded.

Open interest is incomplete, stale, or dated inconsistently; positioning totals are unavailable.

Open interest has both a buyer and a seller; it does not reveal dealer hedge direction. Gross gamma sums both calls and puts without netting and uses a local 1% price-change approximation. It measures sensitivity, not predicted buying or a squeeze probability.

Assessment prepared 2026-10-01 06:02 UTC. Options model values may come from a cached snapshot; their original computation time is not supplied. Open interest has its own effective date.

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Dimensions
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    • Short Interest History

    Settlement Date Current Position Previous Position Change Days to Cover
    2026-10-15 Scheduled
    FINRA publishes Oct 26
    		 — — — —
    2026-09-30 Scheduled
    FINRA publishes Oct 9
    		 — — — —
    2026-09-15 10,802,070 11,440,176 -638,106 5.27
    2026-08-31 11,440,176 10,892,278 +547,898 6.86
    2026-08-14 10,892,278 11,350,580 -458,302 2.66
    2026-07-31 11,350,580 11,624,756 -274,176 5.14
    2026-07-15 11,624,756 16,030,053 -4,405,297 4.76
    2026-06-30 16,030,053 18,647,626 -2,617,573 2.76
    2026-06-15 18,647,626 19,132,984 -485,358 4.48
    2026-05-29 19,132,984 17,606,497 +1,526,487 6.11
    2026-05-15 17,606,497 14,709,273 +2,897,224 3.38
    2026-04-30 14,709,273 13,855,201 +854,072 9.30
    2026-04-15 13,855,201 13,756,534 +98,667 6.97
    2026-03-31 13,756,534 10,037,946 +3,718,588 4.66
    2026-03-13 10,037,946 11,279,030 -1,241,084 5.28
    2026-02-27 11,279,030 11,489,389 -210,359 4.40
    2026-02-13 11,489,389 11,703,014 -213,625 5.28
    2026-01-30 11,703,014 11,887,857 -184,843 4.76
    2026-01-15 11,887,857 11,015,687 +872,170 4.22
    2025-12-31 11,015,687 8,927,430 +2,088,257 2.33
    2025-12-15 8,927,430 9,866,791 -939,361 3.75
    2025-11-28 9,866,791 8,927,374 +939,417 2.82
    2025-11-14 8,927,374 8,033,501 +893,873 4.30
    2025-10-31 8,033,501 9,481,459 -1,447,958 3.52
    2025-10-15 9,481,459 10,727,695 -1,246,236 4.95

    Full FINRA short interest reporting calendar

    Showing 1–23 of 23 settlements
    Key facts CIK 1104506 CUSIP 457669307 13F (30d) 16 filings 13 filers Visit website Investor relations