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HowShorted

How shorted is Quantum Corporation? QMCO

#1,620most shorted US stockof 3,805 ranked stocks, more shorted than 57%

5.19%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.55
5 reports (~10 weeks)
−0.26
days to cover
2.18
Aggregate net short position time series for Quantum Corporation

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 Quantum Corporation 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
10 Aug 20266.12% 31 Jul 20265.08% 14 Aug 2026−1.04
25 Jun 20266.92% 15 Jun 20265.45% 30 Jun 2026−1.47
2 Jun 20269.51% 29 May 20266.92% 15 Jun 2026−2.59
17 Feb 202614.35% 13 Feb 202615.83% 27 Feb 2026+1.48
15 Jan 202611.82% 31 Dec 202512.78% 30 Jan 2026+0.96
13 Nov 202514.23% 31 Oct 202511.36% 14 Nov 2025−2.87
28 Oct 202515.05% 15 Oct 202514.23% 31 Oct 2025−0.82
10 Sep 202526.86% 29 Aug 202513.96% 15 Sep 2025−12.90

Fails to deliver

The SEC's fails-to-deliver figure for QMCO: 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
200
11 Sep 2026
Highest in window
345,836
24 Sep 2025
Days with a balance
162
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Quantum Corporation 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 346K shares.

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Sector: Technology · By year: 2018 · 2020 · 2021 · 2022 · 2023 · 2024 · 2025 · 2026

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20265.19%+0.55
31 Aug 20264.64%−0.44
14 Aug 20265.08%−1.04
31 Jul 20266.12%+0.31
15 Jul 20265.81%+0.36
30 Jun 20265.45%−1.47
15 Jun 20266.92%−2.59
29 May 20269.51%−0.98
15 May 202610.49%−1.66
30 Apr 202612.15%−1.35
15 Apr 202613.50%+1.23
31 Mar 202612.27%−1.54
13 Mar 202613.81%−2.02
27 Feb 202615.83%+1.48
13 Feb 202614.35%+1.57
30 Jan 202612.78%+0.54
15 Jan 202612.24%+0.42
31 Dec 202511.82%−0.98
15 Dec 202512.80%+1.34
28 Nov 202511.46%+0.10
14 Nov 202511.36%−2.87
31 Oct 202514.23%−0.82
15 Oct 202515.05%−2.19
30 Sep 202517.24%+3.28
15 Sep 202513.96%−12.90
29 Aug 202526.86%−2.87
15 Aug 202529.73%−1.23
31 Jul 202530.96%−2.90
15 Jul 202533.86%+0.04
30 Jun 202533.82%−2.44
13 Jun 202536.26%+8.85
30 May 202527.41%+2.88
15 May 202524.53%−4.80
30 Apr 202529.33%+3.33
15 Apr 202526.00%−0.01
31 Mar 202526.01%+0.92
14 Mar 202525.09%+3.78
28 Feb 202521.31%−1.74
14 Feb 202523.05%+18.52
15 Nov 20244.53%+3.73
15 Aug 20240.80%+0.37
31 Jul 20240.43%+0.18
15 Jul 20240.25%−0.03
28 Jun 20240.28%+0.10
15 Feb 20240.18%−0.02
31 Jan 20240.20%−0.11
15 Dec 20230.31%+0.08
30 Nov 20230.23%+0.08
15 Nov 20230.15%+0.03
31 Oct 20230.12%−0.03
13 Oct 20230.15%0.00
29 Sep 20230.15%−0.14
15 Sep 20230.29%−0.14
31 Aug 20230.43%+0.02
15 Aug 20230.41%+0.22
31 Jul 20230.19%−0.06
14 Jul 20230.25%−0.15
30 Jun 20230.40%−0.02
15 Jun 20230.42%−0.02
31 May 20230.44%+0.08
15 May 20230.36%−0.02
28 Apr 20230.38%+0.08
14 Apr 20230.30%+0.02
31 Mar 20230.28%−0.05
15 Mar 20230.33%+0.11
28 Feb 20230.22%−0.04
15 Feb 20230.26%−0.01
31 Jan 20230.27%−0.03
13 Jan 20230.30%−0.02
30 Dec 20220.32%−0.35
15 Dec 20220.67%−0.24
30 Nov 20220.91%−0.21
15 Nov 20221.12%−0.18
31 Oct 20221.30%−0.01
14 Oct 20221.31%−0.02
30 Sep 20221.33%+0.13
15 Sep 20221.20%−0.04
31 Aug 20221.24%−0.58
15 Aug 20221.82%+0.53
29 Jul 20221.29%−0.20
15 Jul 20221.49%−0.04
30 Jun 20221.53%−2.19
15 Jun 20223.72%−2.52
31 May 20226.24%+0.26
13 May 20225.98%+0.45
29 Apr 20225.53%−0.36
14 Apr 20225.89%+1.03
31 Mar 20224.86%+1.04
15 Mar 20223.82%+0.60
28 Feb 20223.22%−0.08
15 Feb 20223.30%+1.01
31 Jan 20222.29%+0.27
14 Jan 20222.02%−0.01
31 Dec 20212.03%−0.04
15 Dec 20212.07%−0.09
30 Nov 20212.16%−0.22
15 Nov 20212.38%−0.58
29 Oct 20212.96%+0.04
15 Oct 20212.92%−0.21
30 Sep 20213.13%−0.05
15 Sep 20213.18%−0.25
31 Aug 20213.43%+0.54
13 Aug 20212.89%−1.02
30 Jul 20213.91%+0.40
15 Jul 20213.51%+0.50
30 Jun 20213.01%+0.96
15 Jun 20212.05%−0.03
28 May 20212.08%−0.06
14 May 20212.14%−0.09
30 Apr 20212.23%+0.05
15 Apr 20212.18%+0.04
31 Mar 20212.14%+0.64
15 Mar 20211.50%+0.16
26 Feb 20211.34%−0.05
12 Feb 20211.39%−0.72
29 Jan 20212.11%−0.04
15 Jan 20212.15%+0.03
31 Dec 20202.12%+0.19
15 Dec 20201.93%−0.30
30 Nov 20202.23%−0.03
13 Nov 20202.26%−0.28
30 Oct 20202.54%−0.18
15 Oct 20202.72%+0.08
30 Sep 20202.64%+0.26
15 Sep 20202.38%−0.58
31 Aug 20202.96%+0.37
14 Aug 20202.59%−0.39
31 Jul 20202.98%+0.01
15 Jul 20202.97%−0.35
30 Jun 20203.32%+2.83
15 Jun 20200.49%+0.16
29 May 20200.33%0.00
15 May 20200.33%−0.01
30 Apr 20200.34%−0.02
15 Apr 20200.36%+0.11
31 Mar 20200.25%−0.26
13 Mar 20200.51%−0.31
28 Feb 20200.82%−0.02
14 Feb 20200.84%−1.81
31 Dec 20182.65%+0.16
14 Dec 20182.49%+0.31
30 Nov 20182.18%−0.18
15 Nov 20182.36%−0.77
31 Oct 20183.13%−1.12
15 Oct 20184.25%+0.66
28 Sep 20183.59%+1.35
31 Jul 20182.24%−0.06
13 Jul 20182.30%+0.08
29 Jun 20182.22%−3.08
15 Jun 20185.30%+0.57
31 May 20184.73%−0.31
15 May 20185.04%−0.11
30 Apr 20185.15%−0.14
13 Apr 20185.29%−0.35
29 Mar 20185.64%+0.17
15 Mar 20185.47%+0.51
28 Feb 20184.96%−0.17
15 Feb 20185.13%+1.09
31 Jan 20184.04%+1.19
12 Jan 20182.85%−0.03
29 Dec 20172.88%–

Newest first. Scroll inside the table for earlier dates, back to 29 Dec 2017.

Frequently asked questions

How shorted is Quantum Corporation right now?
5.19% of Quantum Corporation's (QMCO) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 1,620th 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 QMCO'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 QMCO's days to cover?
2.18 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.