INSM
Insmed, Inc.
stockNASDAQ
At CloseOct 21, 2026 3:59:59 PM EDT
94.09USD-1.652%(-1.58)2,939,874
Pre-marketOct 21, 2026 8:01:30 AM EDT
95.30USD-0.387%(-0.37)
After-hoursOct 21, 2026 4:36:30 PM EDT
94.04USD-0.053%(-0.05)
As of 2026-09-30, there were 13,800,693 shares short with a short interest of 6.96%.
INSM Short Interest - Official
INSM Short Position Change - Official
INSM Short Interest - Official
| Settlement Date1 | Short Interest % | Short Position | Days to Cover2 | Short Position Change | Short Position Change % | Shares Out | Shares Float |
|---|---|---|---|---|---|---|---|
| 2026-09-30 | 6.96 | 13,800,693 | 6.50 | +2,998,623 | +27.76 | 218,381,503 | 198,421,696 |
| 2026-09-15 | 5.44 | 10,802,070 | 5.27 | -638,106 | -5.58 | 218,381,503 | 198,421,696 |
| 2026-08-31 | 5.77 | 11,440,176 | 6.86 | +547,898 | +5.03 | 218,381,503 | 198,421,696 |
| 2026-08-14 | 5.49 | 10,892,278 | 2.66 | -458,302 | -4.04 | 218,381,503 | 198,421,696 |
| 2026-07-31 | 5.72 | 11,350,580 | 5.14 | -274,176 | -2.36 | 216,752,451 | 198,421,696 |
| 2026-07-15 | 5.86 | 11,624,756 | 4.76 | -4,405,297 | -27.48 | 216,752,451 | 198,421,696 |
| 2026-06-30 | 8.08 | 16,030,053 | 2.76 | -2,617,573 | -14.04 | 216,752,451 | 198,298,147 |
| 2026-06-15 | 9.40 | 18,647,626 | 4.48 | +1,041,129 | +5.91 | 216,752,451 | 198,295,980 |
| 2026-05-15 | 9.06 | 17,606,497 | 3.38 | +2,897,224 | +19.70 | 216,752,451 | 194,394,436 |
| 2026-04-30 | 7.69 | 14,709,273 | 9.30 | +854,072 | +6.16 | 215,852,149 | 191,357,487 |
| 2026-04-15 | 7.24 | 13,855,201 | 6.97 | +98,667 | +0.72 | 215,852,149 | 191,357,487 |
| 2026-03-31 | 7.19 | 13,756,534 | 4.66 | +3,718,588 | +37.05 | 215,551,896 | 191,357,487 |
| 2026-03-13 | 5.25 | 10,037,946 | 5.28 | -1,241,084 | -11.00 | 215,551,896 | 191,357,487 |
| 2026-02-27 | 5.89 | 11,279,030 | 4.40 | -210,359 | -1.83 | 213,273,469 | 191,357,487 |
| 2026-02-13 | 6.00 | 11,489,389 | 5.28 | -213,625 | -1.83 | 213,273,469 | 191,357,487 |
| 2026-01-30 | 6.12 | 11,703,014 | 4.76 | -184,843 | -1.55 | 213,273,469 | 191,357,487 |
| 2026-01-15 | 6.21 | 11,887,857 | 4.22 | +872,170 | +7.92 | 213,273,469 | 191,357,487 |
| 2025-12-31 | 5.76 | 11,015,687 | 2.33 | +2,088,257 | +23.39 | 213,273,469 | 191,357,487 |
| 2025-12-15 | 4.67 | 8,927,430 | 3.75 | -939,361 | -9.52 | 213,273,469 | 191,357,487 |
| 2025-11-28 | 5.16 | 9,866,791 | 2.82 | +939,417 | +10.52 | 213,273,469 | 191,327,629 |
| 2025-11-14 | 4.64 | 8,927,374 | 4.30 | +893,873 | +11.13 | 213,273,469 | 192,355,607 |
| 2025-10-31 | 4.18 | 8,033,501 | 3.52 | -1,447,958 | -15.27 | 213,273,469 | 192,180,723 |
Historical data is split-adjusted.
1 Data from Finra. Finra publishes an updated file every two weeks.
2 Days to Cover (DTC) is also called Short Ratio. This is the Short Position / Average Daily Trading Volume.