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HowShorted

How shorted is Arcturus Therapeutics Holdings Inc.? ARCT

#140most shorted US stockof 3,805 ranked stocks, more shorted than 96%

19.24%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−2.21
5 reports (~10 weeks)
−4.69
days to cover
6.37
Aggregate net short position time series for Arcturus Therapeutics Holdings 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 Arcturus Therapeutics Holdings Inc. days to cover

Short interest around results

For each results announcement (an 8-K reporting results, by its SEC filing date), the FINRA settlement before it and the first one after. Settlements fall twice a month, so the two figures can sit up to a month apart and much else changes in between: this shows what was reported, not why.

Reported short interest before and after each results announcement
Results filedSettlement beforeSettlement afterChange
6 Aug 202625.36% 31 Jul 202622.96% 14 Aug 2026−2.40
7 May 202622.66% 30 Apr 202623.13% 15 May 2026+0.47
3 Mar 202621.40% 27 Feb 202620.89% 13 Mar 2026−0.51
10 Nov 202525.59% 31 Oct 202532.42% 14 Nov 2025+6.83
11 Aug 202516.12% 31 Jul 202518.94% 15 Aug 2025+2.82
12 May 202518.94% 30 Apr 202519.96% 15 May 2025+1.02
6 Mar 202515.47% 28 Feb 202516.26% 14 Mar 2025+0.79
7 Nov 202416.94% 31 Oct 202416.56% 15 Nov 2024−0.38

Fails to deliver

The SEC's fails-to-deliver figure for ARCT: 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.

Last balance on file
262
11 Sep 2026
Highest in window
710,690
12 Nov 2025
Days with a balance
97
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Arcturus Therapeutics Holdings 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 711K shares.

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Sector: Healthcare · By year: 2019 · 2020 · 2021 · 2022 · 2023 · 2024 · 2025 · 2026

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 202619.24%−2.21
31 Aug 202621.45%−1.51
14 Aug 202622.96%−2.40
31 Jul 202625.36%+0.72
15 Jul 202624.64%+0.71
30 Jun 202623.93%+0.33
15 Jun 202623.60%−0.07
29 May 202623.67%+0.54
15 May 202623.13%+0.47
30 Apr 202622.66%+0.66
15 Apr 202622.00%−0.69
31 Mar 202622.69%+1.80
13 Mar 202620.89%−0.51
27 Feb 202621.40%−1.74
13 Feb 202623.14%−1.08
30 Jan 202624.22%−1.08
15 Jan 202625.30%+0.10
31 Dec 202525.20%−1.92
15 Dec 202527.12%−0.37
28 Nov 202527.49%−4.93
14 Nov 202532.42%+6.83
31 Oct 202525.59%+6.03
15 Oct 202519.56%+0.62
30 Sep 202518.94%−2.96
15 Sep 202521.90%+1.98
29 Aug 202519.92%+0.98
15 Aug 202518.94%+2.82
31 Jul 202516.12%−0.40
15 Jul 202516.52%−2.06
30 Jun 202518.58%+0.27
13 Jun 202518.31%−1.99
30 May 202520.30%+0.34
15 May 202519.96%+1.02
30 Apr 202518.94%+0.24
15 Apr 202518.70%+1.56
31 Mar 202517.14%+0.88
14 Mar 202516.26%+0.79
28 Feb 202515.47%−0.14
14 Feb 202515.61%−1.16
31 Jan 202516.77%−1.85
15 Jan 202518.62%+0.83
31 Dec 202417.79%+1.39
13 Dec 202416.40%+0.27
29 Nov 202416.13%−0.43
15 Nov 202416.56%−0.38
31 Oct 202416.94%+0.54
15 Oct 202416.40%−0.60
30 Sep 202417.00%−2.32
13 Sep 202419.32%−0.58
30 Aug 202419.90%−0.27
15 Aug 202420.17%+0.27
31 Jul 202419.90%+0.54
15 Jul 202419.36%+1.97
28 Jun 202417.39%+1.11
14 Jun 202416.28%+1.00
31 May 202415.28%−0.06
15 May 202415.34%−2.93
30 Apr 202418.27%+1.13
15 Apr 202417.14%−0.73
28 Mar 202417.87%+2.24
15 Mar 202415.63%−0.16
29 Feb 202415.79%−1.13
15 Feb 202416.92%+0.57
31 Jan 202416.35%+0.83
12 Jan 202415.52%+0.08
29 Dec 202315.44%−1.14
15 Dec 202316.58%−3.74
30 Nov 202320.32%+1.37
15 Nov 202318.95%+0.20
31 Oct 202318.75%+0.73
13 Oct 202318.02%+0.70
29 Sep 202317.32%+1.55
15 Sep 202315.77%+0.98
31 Aug 202314.79%+0.05
15 Aug 202314.74%+0.29
31 Jul 202314.45%+0.79
14 Jul 202313.66%+1.12
30 Jun 202312.54%−1.08
15 Jun 202313.62%+0.02
31 May 202313.60%+1.10
15 May 202312.50%+0.67
28 Apr 202311.83%+1.24
14 Apr 202310.59%+0.60
31 Mar 20239.99%+0.40
15 Mar 20239.59%+0.74
28 Feb 20238.85%+0.44
15 Feb 20238.41%+1.49
31 Jan 20236.92%+0.63
13 Jan 20236.29%−0.89
30 Dec 20227.18%−2.74
15 Dec 20229.92%−0.81
30 Nov 202210.73%+0.90
15 Nov 20229.83%−1.03
31 Oct 202210.86%+0.94
14 Oct 20229.92%+0.55
30 Sep 20229.37%+0.81
15 Sep 20228.56%+0.12
31 Aug 20228.44%−1.38
15 Aug 20229.82%−0.89
29 Jul 202210.71%−0.22
15 Jul 202210.93%−0.30
30 Jun 202211.23%−1.56
15 Jun 202212.79%+0.16
31 May 202212.63%+0.93
13 May 202211.70%+0.12
29 Apr 202211.58%+2.26
14 Apr 20229.32%−0.52
31 Mar 20229.84%+0.88
15 Mar 20228.96%−0.40
28 Feb 20229.36%−0.46
15 Feb 20229.82%−0.20
31 Jan 202210.02%+1.47
14 Jan 20228.55%−0.38
31 Dec 20218.93%+0.90
15 Dec 20218.03%−1.44
30 Nov 20219.47%+1.01
15 Nov 20218.46%+0.76
29 Oct 20217.70%+0.56
15 Oct 20217.14%−0.17
30 Sep 20217.31%−0.67
15 Sep 20217.98%−1.37
31 Aug 20219.35%+0.78
13 Aug 20218.57%−5.41
30 Jul 202113.98%−0.23
15 Jul 202114.21%−1.00
30 Jun 202115.21%−1.36
15 Jun 202116.57%−2.47
28 May 202119.04%−0.56
14 May 202119.60%+1.03
30 Apr 202118.57%+1.99
15 Apr 202116.58%+1.21
31 Mar 202115.37%+2.43
15 Mar 202112.94%−0.09
26 Feb 202113.03%+2.46
12 Feb 202110.57%−1.19
29 Jan 202111.76%−2.20
15 Jan 202113.96%+1.02
31 Dec 202012.94%−2.17
15 Dec 202015.11%−3.62
30 Nov 202018.73%−0.41
13 Nov 202019.14%+0.65
30 Oct 202018.49%+1.47
15 Oct 202017.02%+1.49
30 Sep 202015.53%+6.39
15 Sep 20209.14%+2.83
31 Aug 20206.31%−0.15
14 Aug 20206.46%−4.47
31 Jul 202010.93%+2.80
15 Jul 20208.13%−4.78
30 Jun 202012.91%+5.96
15 Jun 20206.95%+3.85
29 May 20203.10%+0.16
15 May 20202.94%+0.13
30 Apr 20202.81%+0.60
15 Apr 20202.21%+0.81
31 Mar 20201.40%+0.08
13 Mar 20201.32%+0.33
28 Feb 20200.99%−0.17
14 Feb 20201.16%+0.18
31 Jan 20200.98%−0.06
15 Jan 20201.04%−0.17
31 Dec 20191.21%+0.03
13 Dec 20191.18%+0.54
29 Nov 20190.64%+0.16
15 Nov 20190.48%−0.14
31 Oct 20190.62%−0.11
15 Oct 20190.73%–

Newest first. Scroll inside the table for earlier dates, back to 15 Oct 2019.

Frequently asked questions

How shorted is Arcturus Therapeutics Holdings Inc. right now?
19.24% of Arcturus Therapeutics Holdings Inc.'s (ARCT) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 140th 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 ARCT'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 ARCT's days to cover?
6.37 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.