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HowShorted

How shorted is ASP Isotopes Inc.? ASPI

#104most shorted US stockof 3,805 ranked stocks, more shorted than 97%

20.71%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.47
5 reports (~10 weeks)
+1.84
days to cover
6.52
Aggregate net short position time series for ASP Isotopes Inc.

Markers along the chart's base: ▲ results announced (an 8-K reporting results was filed) ▲ quarterly or annual report filed. Dates are SEC filing dates; hover a point to see events since the previous settlement.

Days to cover

FINRA's own figure: reported shares short divided by the stock's average daily trading volume, published alongside each settlement. It expresses the short position in days of typical trading rather than as a percentage of the company; the two can move differently.

Aggregate net short position time series for ASP Isotopes Inc. days to cover

Fails to deliver

The SEC's fails-to-deliver figure for ASPI: the aggregate net balance of shares that failed to be delivered at each settlement date, published by the SEC twice a month and shown here verbatim for the trailing window. A balance is not a daily flow, and a fail has many ordinary causes; the SEC says it cannot guarantee the accuracy of the data. See what fails to deliver are and the largest balances today.

Latest balance
814
14 Sep 2026
Highest in window
519,206
17 Jul 2026
Days with a balance
152
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for ASP Isotopes Inc. fails to deliver

Source: U.S. Securities and Exchange Commission, fails-to-deliver data (public domain). Only settlement days with a positive balance appear; the largest balance in the window was 519K shares.

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Sector: Materials · By year: 2023 · 2024 · 2025 · 2026

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 202620.71%+0.47
31 Aug 202620.24%+2.77
14 Aug 202617.47%−3.69
31 Jul 202621.16%+1.91
15 Jul 202619.25%+0.38
30 Jun 202618.87%+0.53
15 Jun 202618.34%+0.41
29 May 202617.93%−0.40
15 May 202618.33%−1.49
30 Apr 202619.82%−0.30
15 Apr 202620.12%−2.86
31 Mar 202622.98%+2.74
13 Mar 202620.24%−1.71
27 Feb 202621.95%+1.51
13 Feb 202620.44%+1.87
30 Jan 202618.57%−0.57
15 Jan 202619.14%+0.50
31 Dec 202518.64%+0.24
15 Dec 202518.40%+1.43
28 Nov 202516.97%−7.92
14 Nov 202524.89%+1.52
31 Oct 202523.37%+2.30
15 Oct 202521.07%−0.35
30 Sep 202521.42%−0.50
15 Sep 202521.92%+1.33
29 Aug 202520.59%+1.65
15 Aug 202518.94%+1.40
31 Jul 202517.54%−4.23
15 Jul 202521.77%+1.40
30 Jun 202520.37%+0.76
13 Jun 202519.61%+0.73
30 May 202518.88%−3.96
15 May 202522.84%+0.72
30 Apr 202522.12%−0.50
15 Apr 202522.62%−0.58
31 Mar 202523.20%+0.42
14 Mar 202522.78%+0.49
28 Feb 202522.29%−0.07
14 Feb 202522.36%+0.93
31 Jan 202521.43%+10.93
15 Jan 202510.50%+1.01
31 Dec 20249.49%+1.15
13 Dec 20248.34%−0.69
29 Nov 20249.03%+1.22
15 Nov 20247.81%−8.39
31 Oct 202416.20%+1.31
15 Oct 202414.89%+0.53
30 Sep 202414.36%+2.08
13 Sep 202412.28%+0.11
30 Aug 202412.17%+1.21
15 Aug 202410.96%−2.80
31 Jul 202413.76%+2.58
15 Jul 202411.18%+5.38
28 Jun 20245.80%+2.69
14 Jun 20243.11%+0.84
31 May 20242.27%+0.39
15 May 20241.88%+0.02
30 Apr 20241.86%+0.38
15 Apr 20241.48%+1.32
15 Feb 20240.16%−0.19
31 Jan 20240.35%+0.13
12 Jan 20240.22%+0.03
29 Dec 20230.19%+0.02
15 Dec 20230.17%+0.01
30 Nov 20230.16%−0.02
15 Nov 20230.18%−0.54
15 Sep 20230.72%−0.08
31 Aug 20230.80%+0.23
15 Aug 20230.57%+0.41
14 Jul 20230.16%−0.09
30 Jun 20230.25%−0.05
15 Jun 20230.30%+0.15
28 Apr 20230.15%0.00
31 Mar 20230.15%−0.12
15 Mar 20230.27%−0.04
28 Feb 20230.31%+0.01
15 Feb 20230.30%0.00
31 Jan 20230.30%−0.02
13 Jan 20230.32%−0.05
30 Dec 20220.37%–

Newest first. Scroll inside the table for earlier dates, back to 30 Dec 2022.

Frequently asked questions

How shorted is ASP Isotopes Inc. right now?
20.71% of ASP Isotopes Inc.'s (ASPI) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 104th most shorted US stock, out of 3,805 we rank.
What does this number include?
FINRA member firms must report their short positions in all US equities twice a month; FINRA consolidates them per security. We divide that official share count by the company's shares outstanding from its SEC filings. This is the regulatory figure, not a daily estimate.
Why does it only update twice a month?
US short interest is reported for settlement on the 15th and the last business day of each month, and FINRA publishes the consolidated figures about nine business days later. That cadence is set by regulation; no daily official figure exists.
Is this ASPI's short float?
No. This is short interest as a percentage of shares outstanding, the count in the company's SEC filings. "Short float" divides the same FINRA short count by the public float, which excludes closely held shares, so it comes out higher for the same company. We publish no float estimates: the float is not a regulatory figure.
What is ASPI's days to cover?
6.52 days for settlement date 15 Sep 2026: FINRA's own short interest ratio, the reported shares short divided by average daily trading volume. It is published in the same FINRA file and shown verbatim; we hold no volume data ourselves.
Which funds are short?
US public short interest is aggregate-only: individual short sellers are not named. Only some EU markets publish named positions.