ACLS
Axcelis Technologies Inc
stockNASDAQ
At CloseNov 13, 2026 3:59:56 PM EST
104.35USD-3.433%(-3.71)242,753
Pre-marketNov 13, 2026 8:45:30 AM EST
108.93USD+0.805%(+0.87)
After-hoursNov 13, 2026 4:32:30 PM EST
103.38USD-0.930%(-0.97)
As of 2026-10-30, there were 1,347,799 shares short with a short interest of 4.39%.
ACLS Short Interest - Official
ACLS Short Position Change - Official
ACLS 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 | 4.39 | 1,347,799 | 4.14 | -102,073 | -7.04 | 30,881,489 | 30,694,347 |
| 2026-10-15 | 4.76 | 1,449,872 | 4.73 | +10,325 | +0.72 | 30,881,489 | 30,471,641 |
| 2026-09-30 | 4.71 | 1,439,547 | 3.80 | +4,565 | +0.32 | 30,881,489 | 30,531,975 |
| 2026-09-15 | 4.70 | 1,434,982 | 4.48 | -190,385 | -11.71 | 30,881,489 | 30,531,975 |
| 2026-08-31 | 5.32 | 1,625,367 | 5.28 | -57,588 | -3.42 | 30,881,489 | 30,531,975 |
| 2026-08-14 | 5.51 | 1,682,955 | 4.14 | +70,144 | +4.35 | 30,881,489 | 30,531,975 |
| 2026-07-31 | 5.28 | 1,612,811 | 3.97 | -156,998 | -8.87 | 30,733,897 | 30,531,975 |
| 2026-07-15 | 5.80 | 1,769,809 | 3.14 | -129,276 | -6.81 | 30,733,897 | 30,532,590 |
| 2026-06-30 | 6.22 | 1,899,085 | 2.65 | -14,772 | -0.77 | 30,733,897 | 30,532,590 |
| 2026-06-15 | 6.32 | 1,913,857 | 2.96 | -633,136 | -24.86 | 30,733,897 | 30,295,634 |
| 2026-05-29 | 8.41 | 2,546,993 | 5.38 | -84,158 | -3.20 | 30,733,897 | 30,289,948 |
| 2026-05-15 | 8.64 | 2,631,151 | 3.26 | -359,034 | -12.01 | 30,733,897 | 30,460,673 |
| 2026-04-30 | 9.71 | 2,990,185 | 3.78 | -511,562 | -14.61 | 30,729,970 | 30,806,628 |
| 2026-04-15 | 11.37 | 3,501,747 | 6.09 | -295,623 | -7.78 | 30,729,970 | 30,806,628 |
| 2026-03-31 | 12.33 | 3,797,370 | 4.99 | +94,407 | +2.55 | 30,718,815 | 30,806,628 |
| 2026-03-13 | 12.02 | 3,702,963 | 5.09 | +4,339 | +0.12 | 30,718,815 | 30,806,628 |
| 2026-02-27 | 12.01 | 3,698,624 | 2.54 | -1,291,252 | -25.88 | 30,717,000 | 30,806,628 |
| 2026-02-13 | 16.20 | 4,989,876 | 6.44 | +238,785 | +5.03 | 30,699,201 | 30,806,628 |
| 2026-01-30 | 15.42 | 4,751,091 | 9.45 | +111,346 | +2.40 | 30,699,201 | 30,806,628 |
| 2026-01-15 | 15.06 | 4,639,745 | 7.66 | +628,347 | +15.66 | 30,699,201 | 30,806,628 |
| 2025-12-31 | 13.02 | 4,011,398 | 10.77 | -202,643 | -4.81 | 30,999,133 | 30,806,628 |
| 2025-12-15 | 13.67 | 4,214,041 | 7.26 | +142,476 | +3.50 | 30,999,133 | 30,829,258 |
| 2025-11-28 | 13.21 | 4,071,565 | 8.68 | +255,625 | +6.70 | 30,999,133 | 30,825,228 |
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.