How shorted is Arqit Quantum Inc. right now?

13.70% of Arqit Quantum Inc.'s (ARQQ) shares outstanding were reported short for settlement date 15 Jun 2026, per FINRA's consolidated short interest report.

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 ARQQ'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 ARQQ's days to cover?

2.57 days for settlement date 15 Jun 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.

How shorted is Arqit Quantum Inc.? ARQQ

13.70%

of shares outstanding reported short · settlement date 15 Jun 2026

vs previous report: +2.51
5 reports (~10 weeks): +6.74
days to cover: 2.57

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.

Fails to deliver

The SEC's fails-to-deliver figure for ARQQ: 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: 3,244; 14 Sep 2026
Highest in window: 677,974; 22 Jun 2026
Days with a balance: 173
Window: 16 Sep 2025 to 14 Sep 2026

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 678K shares.

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<iframe src="https://howshorted.com/embed/us/arqq/" width="100%" height="430" style="border:0" loading="lazy" title="Arqit Quantum Inc. short interest chart"></iframe>
<p>Source: FINRA data compiled by <a href="https://howshorted.com/us/company/arqq/">howshorted.com</a></p>

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Plain

Short position data for Arqit Quantum Inc.: FINRA, compiled by howshorted.com, settlement date 15 Jun 2026. https://howshorted.com/us/company/arqq/

Wikipedia

<ref>{{cite web |title=Arqit Quantum Inc. short position data |url=https://howshorted.com/us/company/arqq/ |website=HowShorted |publisher=howshorted.com (data: FINRA) |date=2026-06-15 |access-date=2026-10-13}}</ref>

BibTeX

@misc{howshorted-arqit-quantum-inc-2026-06-15,
  title        = {Arqit Quantum Inc. short position data},
  author       = {{HowShorted}},
  howpublished = {\url{https://howshorted.com/us/company/arqq/}},
  note         = {Data: FINRA, settlement date 15 Jun 2026; accessed 2026-10-13},
  year         = {2026}
}

Sector: Technology

History

Full reported short interest history
Settlement date	Short %	Change
15 Jun 2026	13.70%	+2.51
29 May 2026	11.19%	+1.16
15 May 2026	10.03%	+2.00
30 Apr 2026	8.03%	+1.26
15 Apr 2026	6.77%	−0.19
31 Mar 2026	6.96%	+0.10
13 Mar 2026	6.86%	−0.11
27 Feb 2026	6.97%	−0.25
13 Feb 2026	7.22%	+0.51
30 Jan 2026	6.71%	+0.70
15 Jan 2026	6.01%	−0.55
31 Dec 2025	6.56%	+0.56
15 Dec 2025	6.00%	+0.31
28 Nov 2025	5.69%	+0.82
14 Nov 2025	4.87%	+0.10
31 Oct 2025	4.77%	+0.94
15 Oct 2025	3.83%	−1.38
30 Sep 2025	5.21%	+2.76
13 Jun 2025	2.45%	−1.73
30 May 2025	4.18%	−1.02
15 May 2025	5.20%	+0.36
30 Apr 2025	4.84%	+0.17
15 Apr 2025	4.67%	+0.10
31 Mar 2025	4.57%	+0.46
14 Mar 2025	4.11%	−0.12
28 Feb 2025	4.23%	−0.23
14 Feb 2025	4.46%	−0.21
31 Jan 2025	4.67%	+1.33
15 Jan 2025	3.34%	−0.53
31 Dec 2024	3.87%	+1.29
13 Dec 2024	2.58%	−1.02
29 Nov 2024	3.60%	+1.67
15 Nov 2024	1.93%	+0.63
31 Oct 2024	1.30%	+0.17
15 Oct 2024	1.13%	+0.08
30 Sep 2024	1.05%	–

Newest first. Scroll inside the table for earlier dates, back to 30 Sep 2024.

Frequently asked questions

How shorted is Arqit Quantum Inc. right now?: 13.70% of Arqit Quantum Inc.'s (ARQQ) shares outstanding were reported short for settlement date 15 Jun 2026, per FINRA's consolidated short interest report.
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 ARQQ'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 ARQQ's days to cover?: 2.57 days for settlement date 15 Jun 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.