CPST
Calamos S&P 500 Structured Alt Protection ETF - September
stockNYSEETF
At CloseNov 4, 2026 3:20:36 PM EST
28.28USD0.000%(+28.28)2,497
As of 2026-10-15, there were 5,635 shares short with a short interest of 0.38%.
CPST Short Interest - Official
CPST Short Position Change - Official
CPST Short Interest - Official
| Settlement Date1 | Short Interest % | Short Position | Days to Cover2 | Short Position Change | Short Position Change % | Shares Out | Shares Float |
|---|---|---|---|---|---|---|---|
| 2026-10-15 | 0.38 | 5,635 | 1.00 | -6,058 | -51.81 | 1,500,000 | 1,500,000 |
| 2026-09-30 | 0.90 | 11,693 | 1.71 | +7,792 | +199.74 | 1,300,000 | 1,300,000 |
| 2026-09-15 | 0.33 | 3,901 | 1.00 | -7,850 | -66.80 | 1,200,000 | 1,200,000 |
| 2026-08-31 | 0.98 | 11,751 | 7.60 | +7,527 | +178.20 | 1,200,000 | 1,200,000 |
| 2026-08-14 | 0.35 | 4,224 | 1.83 | +1,809 | +74.91 | 1,200,000 | 1,200,000 |
| 2026-07-31 | 0.20 | 2,415 | 1.03 | -497 | -17.07 | 1,200,000 | 1,200,000 |
| 2026-07-15 | 0.24 | 2,912 | 6.17 | +631 | +27.66 | 1,200,000 | 1,200,000 |
| 2026-06-30 | 0.19 | 2,281 | 1.69 | -2,281 | -50.00 | 1,200,000 | 1,200,000 |
| 2026-06-15 | 0.38 | 4,562 | 3.00 | +2,120 | +86.81 | 1,200,000 | 1,200,000 |
| 2026-05-15 | 0.20 | 2,442 | 1.00 | -1,094 | -30.94 | 1,200,000 | 1,200,000 |
| 2026-04-30 | 0.29 | 3,536 | 4.28 | +152 | +4.49 | 1,200,000 | 1,200,000 |
| 2026-04-15 | 0.28 | 3,384 | 4.56 | +3 | +0.09 | 1,200,000 | 1,200,000 |
| 2026-03-31 | 0.28 | 3,381 | 4.38 | -129 | -3.68 | 1,200,000 | 1,200,000 |
| 2026-03-13 | 0.29 | 3,510 | 1.00 | -1,655 | -32.04 | 1,200,000 | 1,200,000 |
| 2026-02-27 | 0.43 | 5,165 | 2.45 | -575 | -10.02 | 1,200,000 | 1,200,000 |
| 2026-02-13 | 0.48 | 5,740 | 1.49 | +5,462 | +1,964.75 | 1,200,000 | 1,200,000 |
| 2026-01-30 | 0.02 | 278 | 1.00 | -2,620 | -90.41 | 1,200,000 | 1,200,000 |
| 2026-01-15 | 0.24 | 2,898 | 2.15 | -3,516 | -54.82 | 1,200,000 | 1,200,000 |
| 2025-12-31 | 0.53 | 6,414 | 4.96 | -1,685 | -20.81 | 1,200,000 | 1,200,000 |
| 2025-12-15 | 0.67 | 8,099 | 3.75 | +983 | +13.81 | 1,200,000 | 1,200,000 |
| 2025-11-28 | 0.59 | 7,116 | 3.15 | -593 | -7.69 | 1,200,000 | 1,200,000 |
| 2025-11-14 | 0.70 | 7,709 | 3.91 | -1,463 | -15.95 | 1,100,000 | 1,100,000 |
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.