PEN
Penumbra, Inc.
stockNYSE
At CloseOct 2, 2026 3:59:50 PM EDT
317.59USD-0.129%(-0.41)239,681
As of 2026-09-15, there were 1,805,942 shares short with a short interest of 4.72%.
PEN Short Interest - Official
Short Interest
PEN Short Position Change - Official
Short Position Change
PEN 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 | 4.72 | 1,805,942 | 7.18 | +74,449 | +4.30 | 39,389,422 | 38,291,245 |
| 2026-08-31 | 4.52 | 1,731,493 | 6.02 | -87,301 | -4.80 | 39,389,422 | 38,291,245 |
| 2026-08-14 | 4.75 | 1,818,794 | 6.99 | -17,252 | -0.94 | 39,389,422 | 38,291,245 |
| 2026-07-31 | 4.80 | 1,836,046 | 4.19 | -287,711 | -13.55 | 39,389,422 | 38,234,865 |
| 2026-07-15 | 5.55 | 2,123,757 | 6.30 | +86,137 | +4.23 | 39,331,425 | 38,234,865 |
| 2026-06-30 | 5.33 | 2,037,620 | 5.10 | +50,701 | +2.55 | 39,331,425 | 38,234,865 |
| 2026-06-15 | 5.20 | 1,986,919 | 4.61 | +70,643 | +3.69 | 39,331,425 | 38,234,865 |
| 2026-05-15 | 5.03 | 1,916,276 | 4.65 | +19,310 | +1.02 | 39,331,425 | 38,111,025 |
| 2026-04-30 | 5.00 | 1,896,966 | 3.28 | -110,202 | -5.49 | 39,331,425 | 37,954,790 |
| 2026-04-15 | 5.29 | 2,007,168 | 4.24 | -430,471 | -17.66 | 39,243,053 | 37,954,790 |
| 2026-03-31 | 6.42 | 2,437,639 | 3.72 | +376,303 | +18.26 | 39,243,053 | 37,954,790 |
| 2026-03-13 | 5.43 | 2,061,336 | 3.11 | +194,907 | +10.44 | 39,243,053 | 37,954,790 |
| 2026-02-27 | 4.92 | 1,866,429 | 3.00 | +3,293 | +0.18 | 39,229,670 | 37,954,790 |
| 2026-02-13 | 4.91 | 1,863,136 | 1.91 | +261,405 | +16.32 | 39,229,670 | 37,954,790 |
| 2026-01-30 | 4.22 | 1,601,731 | 1.00 | -120,320 | -6.99 | 39,229,670 | 37,954,790 |
| 2026-01-15 | 4.54 | 1,722,051 | 1.07 | +12,377 | +0.72 | 39,162,177 | 37,954,790 |
| 2025-12-31 | 4.50 | 1,709,674 | 4.32 | +102,071 | +6.35 | 39,162,177 | 37,954,790 |
| 2025-12-15 | 4.24 | 1,607,603 | 3.16 | +92,834 | +6.13 | 39,162,177 | 37,937,832 |
| 2025-11-28 | 3.99 | 1,514,769 | 3.05 | -172,602 | -10.23 | 39,162,177 | 37,947,366 |
| 2025-11-14 | 4.45 | 1,687,371 | 2.95 | -131,920 | -7.25 | 39,162,177 | 37,941,884 |
| 2025-10-31 | 4.82 | 1,819,291 | 4.61 | +85,773 | +4.95 | 38,999,129 | 37,778,846 |
| 2025-10-15 | 4.59 | 1,733,518 | 5.32 | +120,552 | +7.47 | 38,999,129 | 37,777,676 |
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.