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HowShorted

How shorted was Marinus Pharmaceuticals, Inc.? MRNS

Marinus Pharmaceuticals, Inc. left the US market in 2025. This page is a frozen archive of its reported short interest, ending 31 Jan 2025. The ticker MRNS no longer refers to this company and may since have been reassigned.
3.95%
of shares outstanding reported short · settlement date 31 Jan 2025
vs previous report
−0.26
5 reports (~10 weeks)
−4.36
days to cover
1.44
Aggregate net short position time series for Marinus Pharmaceuticals, 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 Marinus Pharmaceuticals, 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
12 Nov 202410.28% 31 Oct 20248.31% 15 Nov 2024−1.97
13 Aug 20244.59% 31 Jul 20244.86% 15 Aug 2024+0.27
8 May 20249.15% 30 Apr 20248.94% 15 May 2024−0.21
15 Apr 20246.36% 28 Mar 20249.15% 30 Apr 2024+2.79
5 Mar 20246.27% 29 Feb 20246.54% 15 Mar 2024+0.27
4 Jan 20248.04% 29 Dec 20237.05% 12 Jan 2024−0.99
7 Nov 20238.76% 31 Oct 20238.33% 15 Nov 2023−0.43
10 Aug 20235.90% 31 Jul 20236.61% 15 Aug 2023+0.71
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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
31 Jan 20253.95%−0.26
15 Jan 20254.21%−2.35
31 Dec 20246.56%−1.26
13 Dec 20247.82%−0.11
29 Nov 20247.93%−0.38
15 Nov 20248.31%−1.97
31 Oct 202410.28%+3.95
15 Oct 20246.33%+0.48
30 Sep 20245.85%+0.59
13 Sep 20245.26%+0.29
30 Aug 20244.97%+0.11
15 Aug 20244.86%+0.27
31 Jul 20244.59%−0.35
15 Jul 20244.94%−3.64
28 Jun 20248.58%+0.09
14 Jun 20248.49%−0.91
31 May 20249.40%+0.46
15 May 20248.94%−0.21
30 Apr 20249.15%+0.89
15 Apr 20248.26%+1.90
28 Mar 20246.36%−0.18
15 Mar 20246.54%+0.27
29 Feb 20246.27%−0.27
15 Feb 20246.54%−0.09
31 Jan 20246.63%−0.42
12 Jan 20247.05%−0.99
29 Dec 20238.04%+0.86
15 Dec 20237.18%−0.07
30 Nov 20237.25%−1.08
15 Nov 20238.33%−0.43
31 Oct 20238.76%+1.15
13 Oct 20237.61%+0.44
29 Sep 20237.17%−0.32
15 Sep 20237.49%+0.40
31 Aug 20237.09%+0.48
15 Aug 20236.61%+0.71
31 Jul 20235.90%−0.61
14 Jul 20236.51%+0.95
30 Jun 20235.56%+1.95
15 Jun 20233.61%+0.52
31 May 20233.09%−0.59
15 May 20233.68%+0.61
28 Apr 20233.07%−0.77
14 Apr 20233.84%+0.25
31 Mar 20233.59%+0.52
15 Mar 20233.07%−0.75
28 Feb 20233.82%+0.25
15 Feb 20233.57%+0.06
31 Jan 20233.51%−0.29
13 Jan 20233.80%+0.15
30 Dec 20223.65%+0.19
15 Dec 20223.46%+0.06
30 Nov 20223.40%−0.07
15 Nov 20223.47%−0.47
31 Oct 20223.94%+0.23
14 Oct 20223.71%−0.22
30 Sep 20223.93%+0.89
15 Sep 20223.04%+0.12
31 Aug 20222.92%+0.43
15 Aug 20222.49%−0.23
29 Jul 20222.72%+0.01
15 Jul 20222.71%−0.03
30 Jun 20222.74%−3.79
15 Jun 20226.53%+1.52
31 May 20225.01%+0.59
13 May 20224.42%+0.66
29 Apr 20223.76%+0.30
14 Apr 20223.46%−0.38
31 Mar 20223.84%−0.29
15 Mar 20224.13%+0.69
28 Feb 20223.44%+0.10
15 Feb 20223.34%+0.48
31 Jan 20222.86%0.00
14 Jan 20222.86%+0.06
31 Dec 20212.80%−0.22
15 Dec 20213.02%−0.04
30 Nov 20213.06%+0.03
15 Nov 20213.03%−6.98
30 Sep 202110.01%+0.15
15 Sep 20219.86%−0.38
31 Aug 202110.24%−0.11
13 Aug 202110.35%−0.09
30 Jul 202110.44%−0.06
15 Jul 202110.50%−0.48
30 Jun 202110.98%−0.10
15 Jun 202111.08%−0.82
28 May 202111.90%−0.68
14 May 202112.58%+0.30
30 Apr 202112.28%+0.09
15 Apr 202112.19%+0.05
31 Mar 202112.14%+0.61
15 Mar 202111.53%−2.30
26 Feb 202113.83%+0.16
12 Feb 202113.67%−0.28
29 Jan 202113.95%−0.28
15 Jan 202114.23%−3.02
31 Dec 202017.25%+1.06
15 Dec 202016.19%0.00
30 Nov 202016.19%+0.18
13 Nov 202016.01%+3.63
15 Sep 202012.38%+0.27
31 Aug 202012.11%+2.78
14 Aug 20209.33%−2.98
31 Jul 202012.31%+2.76
15 Jul 20209.55%+0.76
30 Jun 20208.79%+1.08
15 Jun 20207.71%+0.03
29 May 20207.68%−0.69
15 May 20208.37%−0.36
30 Apr 20208.73%−0.38
15 Apr 20209.11%+0.18
31 Mar 20208.93%+2.67
13 Mar 20206.26%−3.61
28 Feb 20209.87%+0.13
14 Feb 20209.74%+0.38
31 Jan 20209.36%+0.86
15 Jan 20208.50%+3.07
31 Dec 20195.43%+1.23
13 Dec 20194.20%+0.45
29 Nov 20193.75%−0.09
15 Nov 20193.84%−1.77
31 Oct 20195.61%−0.71
15 Oct 20196.32%−1.94
30 Sep 20198.26%+2.67
13 Sep 20195.59%−0.43
30 Aug 20196.02%−0.64
15 Aug 20196.66%+0.44
31 Jul 20196.22%−0.94
15 Jul 20197.16%−0.58
28 Jun 20197.74%+0.30
14 Jun 20197.44%−0.59
31 May 20198.03%+0.12
15 May 20197.91%+1.00
30 Apr 20196.91%+0.08
15 Apr 20196.83%+0.87
29 Mar 20195.96%+0.72
15 Mar 20195.24%−1.44
28 Feb 20196.68%−0.45
15 Feb 20197.13%+0.65
31 Jan 20196.48%−0.49
15 Jan 20196.97%+0.05
31 Dec 20186.92%−3.51
14 Dec 201810.43%+2.66
30 Nov 20187.77%−0.59
15 Nov 20188.36%−0.44
31 Oct 20188.80%−1.07
15 Oct 20189.87%−0.06
28 Sep 20189.93%+0.56
14 Sep 20189.37%−0.05
31 Aug 20189.42%+0.26
15 Aug 20189.16%−1.42
31 Jul 201810.58%−0.04
13 Jul 201810.62%−0.64
29 Jun 201811.26%+6.24
15 Jun 20185.02%+0.41
31 May 20184.61%−0.89
15 May 20185.50%−0.28
30 Apr 20185.78%−0.79
13 Apr 20186.57%−0.50
29 Mar 20187.07%+1.62
15 Mar 20185.45%+1.14
28 Feb 20184.31%−0.86
15 Feb 20185.17%−0.07
31 Jan 20185.24%−0.11
12 Jan 20185.35%−0.23
29 Dec 20175.58%–

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

Frequently asked questions

How shorted was Marinus Pharmaceuticals, Inc.?
Marinus Pharmaceuticals, Inc. left the US market in 2025. Its final reported figure was 3.95% of shares outstanding for settlement date 31 Jan 2025, per FINRA's consolidated short interest report; this page preserves its full history.
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 MRNS'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 MRNS's days to cover?
1.44 days for settlement date 31 Jan 2025: 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.