QSI
Quantum-Si Incorporated Class A Common Stock
stockNASDAQ
At CloseNov 13, 2026 3:59:55 PM EST
1.14USD-6.557%(-0.08)3,536,152
Pre-marketNov 13, 2026 9:28:30 AM EST
1.2397USD+1.615%(+0.0197)
After-hoursNov 13, 2026 4:40:30 PM EST
1.1795USD+3.465%(+0.0395)
As of 2026-10-30, there were 12,702,631 shares short with a short interest of 7.42%.
QSI Short Interest - Official
QSI Short Position Change - Official
QSI Short Interest - Official
| Settlement Date1 | Short Interest % | Short Position | Days to Cover2 | Short Position Change | Short Position Change % | Shares Out | Shares Float |
|---|---|---|---|---|---|---|---|
| 2026-10-30 | 7.42 | 12,702,631 | 1.45 | -505,112 | -3.82 | 218,883,912 | 171,251,523 |
| 2026-10-15 | 7.71 | 13,207,743 | 1.00 | +1,377,209 | +11.64 | 218,883,912 | 171,250,528 |
| 2026-09-30 | 6.96 | 11,830,534 | 2.46 | -1,215,608 | -9.32 | 218,883,912 | 170,075,356 |
| 2026-09-15 | 7.67 | 13,046,142 | 10.32 | -1,398,827 | -9.68 | 218,883,912 | 170,075,356 |
| 2026-08-31 | 8.49 | 14,444,969 | 4.78 | +171,406 | +1.20 | 218,883,912 | 170,075,356 |
| 2026-08-14 | 8.39 | 14,273,563 | 4.68 | -1,144,169 | -7.42 | 218,883,912 | 170,075,356 |
| 2026-07-31 | 9.07 | 15,417,732 | 5.91 | +1,287,943 | +9.12 | 217,760,163 | 170,075,356 |
| 2026-07-15 | 8.31 | 14,129,789 | 4.24 | -3,269,138 | -18.79 | 217,760,163 | 170,076,741 |
| 2026-06-30 | 10.23 | 17,398,927 | 2.72 | -5,115,195 | -22.72 | 217,760,163 | 170,076,741 |
| 2026-06-15 | 13.24 | 22,514,122 | 3.40 | -738,419 | -3.18 | 217,760,163 | 169,999,986 |
| 2026-05-15 | 13.78 | 23,252,541 | 3.88 | +285,096 | +1.24 | 217,760,163 | 168,731,086 |
| 2026-04-30 | 12.91 | 22,967,445 | 3.40 | +27,868 | +0.12 | 216,368,773 | 177,964,295 |
| 2026-04-15 | 12.89 | 22,939,577 | 5.57 | +796,388 | +3.60 | 216,368,773 | 177,964,295 |
| 2026-03-31 | 12.44 | 22,143,189 | 7.21 | +630,441 | +2.93 | 216,368,773 | 177,964,295 |
| 2026-03-13 | 12.09 | 21,512,748 | 5.19 | +376,522 | +1.78 | 216,368,773 | 177,964,295 |
| 2026-02-27 | 11.88 | 21,136,226 | 8.03 | -206,255 | -0.97 | 215,489,665 | 177,964,295 |
| 2026-02-13 | 11.99 | 21,342,481 | 4.23 | +2,486,713 | +13.19 | 215,489,665 | 177,964,295 |
| 2026-01-30 | 10.60 | 18,855,768 | 3.91 | -470,098 | -2.43 | 215,489,665 | 177,964,295 |
| 2026-01-15 | 10.86 | 19,325,866 | 3.65 | +60,963 | +0.32 | 215,489,665 | 177,964,295 |
| 2025-12-31 | 10.83 | 19,264,903 | 3.63 | -59,316 | -0.31 | 215,489,665 | 177,964,295 |
| 2025-12-15 | 10.86 | 19,324,219 | 4.74 | +486,299 | +2.58 | 215,489,665 | 177,964,295 |
| 2025-11-28 | 10.59 | 18,837,920 | 3.98 | +3,051,994 | +19.33 | 215,489,665 | 177,964,295 |
| 2025-11-14 | 8.87 | 15,785,926 | 2.13 | -1,168,027 | -6.89 | 215,489,665 | 177,964,295 |
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.