ALNY
Alnylam Pharmaceuticals, Inc.
stockNASDAQ
At CloseOct 2, 2026 3:59:53 PM EDT
219.90USD-4.879%(-11.28)1,661,854
Pre-marketOct 2, 2026 9:19:30 AM EDT
231.93USD+0.324%(+0.75)
After-hoursOct 2, 2026 4:39:30 PM EDT
219.72USD-0.082%(-0.18)
As of 2026-09-15, there were 7,194,097 shares short with a short interest of 5.40%.
ALNY Short Interest - Official
Short Interest
ALNY Short Position Change - Official
Short Position Change
ALNY Short Interest - Official
| Settlement Date1 | Short Interest % | Short Position | Days to Cover2 | Short Position Change | Short Position Change % | Shares Out | Shares Float |
|---|---|---|---|---|---|---|---|
| 2026-09-15 | 5.40 | 7,194,097 | 4.13 | +854,010 | +13.47 | 133,809,118 | 133,234,959 |
| 2026-08-31 | 4.76 | 6,340,087 | 3.90 | +1,569,109 | +32.89 | 133,809,118 | 133,234,959 |
| 2026-08-14 | 3.58 | 4,770,978 | 2.36 | -32,216 | -0.67 | 133,809,118 | 133,234,959 |
| 2026-07-31 | 3.61 | 4,803,194 | 2.18 | -970,179 | -16.80 | 133,809,118 | 132,940,229 |
| 2026-07-15 | 4.34 | 5,773,373 | 3.24 | -26,415 | -0.46 | 133,512,573 | 132,941,139 |
| 2026-06-30 | 4.36 | 5,799,788 | 4.22 | +362,451 | +6.67 | 133,512,573 | 132,941,139 |
| 2026-06-15 | 4.09 | 5,437,337 | 4.76 | +137,322 | +2.59 | 133,512,573 | 132,940,095 |
| 2026-05-29 | 3.99 | 5,300,015 | 5.78 | -98,789 | -1.83 | 133,512,573 | 132,940,496 |
| 2026-05-15 | 4.07 | 5,398,804 | 5.13 | +625,590 | +13.11 | 133,512,573 | 132,592,160 |
| 2026-04-30 | 3.68 | 4,773,214 | 4.02 | -260,849 | -5.18 | 133,427,910 | 129,790,114 |
| 2026-04-15 | 3.88 | 5,034,063 | 5.12 | -22,345 | -0.44 | 133,427,910 | 129,790,114 |
| 2026-03-31 | 3.90 | 5,056,408 | 4.01 | +686,793 | +15.72 | 132,623,144 | 129,790,114 |
| 2026-03-13 | 3.37 | 4,369,615 | 4.18 | -203,037 | -4.44 | 132,623,144 | 129,790,114 |
| 2026-02-27 | 3.52 | 4,572,652 | 4.46 | -671,823 | -12.81 | 132,623,144 | 129,790,114 |
| 2026-02-13 | 4.04 | 5,244,475 | 2.80 | -37,661 | -0.71 | 132,623,144 | 129,790,114 |
| 2026-01-30 | 4.07 | 5,282,136 | 3.66 | -283,825 | -5.10 | 132,113,818 | 129,790,114 |
| 2026-01-15 | 4.29 | 5,565,961 | 3.72 | +33,802 | +0.61 | 132,113,818 | 129,790,114 |
| 2025-12-31 | 4.26 | 5,532,159 | 2.89 | +1,347,507 | +32.20 | 132,113,818 | 129,790,114 |
| 2025-12-15 | 3.22 | 4,184,652 | 3.19 | +224,462 | +5.67 | 132,113,818 | 129,790,114 |
| 2025-11-28 | 3.04 | 3,960,190 | 4.09 | -319,060 | -7.46 | 132,113,818 | 130,249,692 |
| 2025-11-14 | 3.29 | 4,279,250 | 4.49 | +510,152 | +13.54 | 132,113,818 | 130,244,407 |
| 2025-10-31 | 3.00 | 3,769,098 | 3.34 | -224,824 | -5.63 | 132,113,818 | 125,497,525 |
| 2025-10-15 | 3.17 | 3,993,922 | 3.48 | +486,382 | +13.87 | 131,079,015 | 126,133,404 |
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.