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HowShorted

How shorted is Mercury Systems Inc? MRCY

#926most shorted US stockof 3,805 ranked stocks, more shorted than 75%

8.37%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−0.33
5 reports (~10 weeks)
+0.64
days to cover
7.30
Aggregate net short position time series for Mercury Systems 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 Mercury Systems 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
18 Aug 20268.28% 14 Aug 20268.70% 31 Aug 2026+0.42
5 May 20267.90% 30 Apr 20268.10% 15 May 2026+0.20
3 Feb 20266.37% 30 Jan 20266.18% 13 Feb 2026−0.19
4 Nov 20257.32% 31 Oct 20258.20% 14 Nov 2025+0.88
11 Aug 20258.39% 31 Jul 20258.13% 15 Aug 2025−0.26
6 May 20256.52% 30 Apr 20257.08% 15 May 2025+0.56
1 Apr 20256.73% 31 Mar 20256.66% 15 Apr 2025−0.07
4 Feb 20256.92% 31 Jan 20256.47% 14 Feb 2025−0.45

Fails to deliver

The SEC's fails-to-deliver figure for MRCY: 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
187
10 Sep 2026
Highest in window
235,804
14 Oct 2025
Days with a balance
83
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Mercury Systems 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 236K shares.

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Sector: Technology

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20268.37%−0.33
31 Aug 20268.70%+0.42
14 Aug 20268.28%+0.05
31 Jul 20268.23%+0.23
15 Jul 20268.00%+0.27
30 Jun 20267.73%+0.12
15 Jun 20267.61%−0.27
29 May 20267.88%−0.22
15 May 20268.10%+0.20
30 Apr 20267.90%+0.11
15 Apr 20267.79%+0.38
31 Mar 20267.41%+0.70
13 Mar 20266.71%+0.14
27 Feb 20266.57%+0.39
13 Feb 20266.18%−0.19
30 Jan 20266.37%−2.15
15 Jan 20268.52%+0.40
31 Dec 20258.12%−0.14
15 Dec 20258.26%+0.14
28 Nov 20258.12%−0.08
14 Nov 20258.20%+0.88
31 Oct 20257.32%−0.54
15 Oct 20257.86%+0.05
30 Sep 20257.81%+0.35
15 Sep 20257.46%−0.40
29 Aug 20257.86%−0.27
15 Aug 20258.13%−0.26
31 Jul 20258.39%+0.44
15 Jul 20257.95%−0.51
30 Jun 20258.46%+0.44
13 Jun 20258.02%−0.06
30 May 20258.08%+1.00
15 May 20257.08%+0.56
30 Apr 20256.52%−0.14
15 Apr 20256.66%−0.07
31 Mar 20256.73%+0.20
14 Mar 20256.53%+0.11
28 Feb 20256.42%−0.05
14 Feb 20256.47%−0.45
31 Jan 20256.92%−0.39
15 Jan 20257.31%+0.08
31 Dec 20247.23%−0.35
13 Dec 20247.58%+0.22
29 Nov 20247.36%+0.10
15 Nov 20247.26%−0.11
31 Oct 20247.37%−0.46
15 Oct 20247.83%−0.37
30 Sep 20248.20%−0.67
13 Sep 20248.87%−0.27
30 Aug 20249.14%−0.53
15 Aug 20249.67%+0.44
31 Jul 20249.23%+0.75
15 Jul 20248.48%+0.69
28 Jun 20247.79%+0.06
14 Jun 20247.73%−0.18
31 May 20247.91%+0.51
15 May 20247.40%+0.21
30 Apr 20247.19%+0.27
15 Apr 20246.92%+0.61
28 Mar 20246.31%−0.03
15 Mar 20246.34%+0.11
29 Feb 20246.23%−0.03
15 Feb 20246.26%+0.49
31 Jan 20245.77%−0.04
12 Jan 20245.81%−0.01
29 Dec 20235.82%−0.35
15 Dec 20236.17%+0.37
30 Nov 20235.80%−0.40
15 Nov 20236.20%+0.90
31 Oct 20235.30%+0.05
13 Oct 20235.25%+0.29
29 Sep 20234.96%−0.08
15 Sep 20235.04%+0.25
31 Aug 20234.79%+0.47
15 Aug 20234.32%+0.40
31 Jul 20233.92%0.00
14 Jul 20233.92%+0.10
30 Jun 20233.82%+0.03
15 Jun 20233.79%−0.28
31 May 20234.07%+0.03
15 May 20234.04%+0.22
28 Apr 20233.82%−0.15
14 Apr 20233.97%+0.15
31 Mar 20233.82%+0.23
15 Mar 20233.59%−0.12
28 Feb 20233.71%−0.03
15 Feb 20233.74%−0.57
31 Jan 20234.31%+0.02
13 Jan 20234.29%−0.13
30 Dec 20224.42%+0.07
15 Dec 20224.35%+0.59
30 Nov 20223.76%0.00
15 Nov 20223.76%+0.30
31 Oct 20223.46%+0.06
14 Oct 20223.40%−0.56
30 Sep 20223.96%+0.46
15 Sep 20223.50%+0.10
31 Aug 20223.40%+0.14
15 Aug 20223.26%−0.08
29 Jul 20223.34%+0.41
15 Jul 20222.93%−0.37
30 Jun 20223.30%−0.29
15 Jun 20223.59%−0.80
31 May 20224.39%−1.35
13 May 20225.74%−0.35
29 Apr 20226.09%−0.16
14 Apr 20226.25%−0.21
31 Mar 20226.46%−0.39
15 Mar 20226.85%−0.11
28 Feb 20226.96%+0.57
15 Feb 20226.39%+0.82
31 Jan 20225.57%+0.05
14 Jan 20225.52%+0.27
31 Dec 20215.25%+0.52
15 Dec 20214.73%+0.22
30 Nov 20214.51%+0.54
15 Nov 20213.97%−1.03
29 Oct 20215.00%+0.63
15 Oct 20214.37%+1.79
30 Sep 20212.58%+0.01
15 Sep 20212.57%−0.06
31 Aug 20212.63%+0.72
13 Aug 20211.91%+0.05
30 Jul 20211.86%−0.04
15 Jul 20211.90%−0.18
30 Jun 20212.08%−0.03
15 Jun 20212.11%+0.06
28 May 20212.05%−0.12
14 May 20212.17%+0.25
30 Apr 20211.92%−0.09
15 Apr 20212.01%+0.21
31 Mar 20211.80%+0.03
15 Mar 20211.77%+0.48
26 Feb 20211.29%−0.27
12 Feb 20211.56%+0.10
29 Jan 20211.46%−0.05
15 Jan 20211.51%−0.16
31 Dec 20201.67%−0.11
15 Dec 20201.78%+0.35
30 Nov 20201.43%−0.18
13 Nov 20201.61%−0.31
30 Oct 20201.92%−0.03
15 Oct 20201.95%−0.33
30 Sep 20202.28%+0.01
15 Sep 20202.27%−0.14
31 Aug 20202.41%+0.05
14 Aug 20202.36%−0.02
31 Jul 20202.38%−0.19
15 Jul 20202.57%−0.22
30 Jun 20202.79%−0.72
15 Jun 20203.51%+0.04
29 May 20203.47%+0.13
15 May 20203.34%−0.07
30 Apr 20203.41%−0.19
15 Apr 20203.60%+0.12
31 Mar 20203.48%−0.71
13 Mar 20204.19%+0.38
28 Feb 20203.81%+0.08
14 Feb 20203.73%−0.20
31 Jan 20203.93%+0.81
15 Jan 20203.12%−0.33
31 Dec 20193.45%−0.12
13 Dec 20193.57%−0.07
29 Nov 20193.64%−0.05
15 Nov 20193.69%+0.06
31 Oct 20193.63%+0.34
15 Oct 20193.29%−0.58
30 Sep 20193.87%+0.37
13 Sep 20193.50%+0.05
30 Aug 20193.45%0.00
15 Aug 20193.45%−0.65
31 Jul 20194.10%−0.77
15 Jul 20194.87%−0.25
28 Jun 20195.12%−0.08
14 Jun 20195.20%+0.20
31 May 20195.00%+1.32
15 May 20193.68%−0.49
30 Apr 20194.17%−0.23
15 Apr 20194.40%−0.39
29 Mar 20194.79%−1.33
15 Mar 20196.12%+0.77
28 Feb 20195.35%−0.35
15 Feb 20195.70%−0.28
31 Jan 20195.98%−0.08
15 Jan 20196.06%−0.21
31 Dec 20186.27%−0.43
14 Dec 20186.70%−0.49
30 Nov 20187.19%+0.12
15 Nov 20187.07%−0.46
31 Oct 20187.53%−0.15
15 Oct 20187.68%−0.02
28 Sep 20187.70%−0.97
14 Sep 20188.67%−0.11
31 Aug 20188.78%−0.40
15 Aug 20189.18%−1.98
31 Jul 201811.16%+0.07
13 Jul 201811.09%+1.24
29 Jun 20189.85%+1.23
15 Jun 20188.62%+2.21
31 May 20186.41%−0.23
15 May 20186.64%−0.17
30 Apr 20186.81%+1.29
13 Apr 20185.52%+0.94
29 Mar 20184.58%+0.45
15 Mar 20184.13%+0.31
28 Feb 20183.82%+0.03
15 Feb 20183.79%+0.08
31 Jan 20183.71%+0.07
12 Jan 20183.64%+0.34
29 Dec 20173.30%–

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

Frequently asked questions

How shorted is Mercury Systems Inc right now?
8.37% of Mercury Systems Inc's (MRCY) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 926th 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 MRCY'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 MRCY's days to cover?
7.30 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.