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HowShorted

How shorted is Mirum Pharmaceuticals, Inc.? MIRM

#724most shorted US stockof 3,805 ranked stocks, more shorted than 80%

9.67%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.16
5 reports (~10 weeks)
−2.60
days to cover
11.99
Aggregate net short position time series for Mirum 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 Mirum 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
5 Aug 202610.51% 31 Jul 20269.99% 14 Aug 2026−0.52
6 May 202616.37% 30 Apr 202613.44% 15 May 2026−2.93
25 Feb 202615.65% 13 Feb 202614.83% 27 Feb 2026−0.82
12 Jan 202616.27% 31 Dec 202514.77% 15 Jan 2026−1.50
4 Nov 202513.67% 31 Oct 202514.91% 14 Nov 2025+1.24
6 Aug 202513.39% 31 Jul 202513.79% 15 Aug 2025+0.40
7 May 202512.97% 30 Apr 202512.69% 15 May 2025−0.28
26 Feb 202513.77% 14 Feb 202513.80% 28 Feb 2025+0.03

Fails to deliver

The SEC's fails-to-deliver figure for MIRM: 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
27
10 Sep 2026
Highest in window
241,590
24 Jul 2026
Days with a balance
67
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Mirum Pharmaceuticals, 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 242K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20269.67%+0.16
31 Aug 20269.51%−0.48
14 Aug 20269.99%−0.52
31 Jul 202610.51%−1.42
15 Jul 202611.93%−0.34
30 Jun 202612.27%+0.94
15 Jun 202611.33%+0.57
29 May 202610.76%−2.68
15 May 202613.44%−2.93
30 Apr 202616.37%+0.39
15 Apr 202615.98%+0.32
31 Mar 202615.66%+1.14
13 Mar 202614.52%−0.31
27 Feb 202614.83%−0.82
13 Feb 202615.65%+0.48
30 Jan 202615.17%+0.40
15 Jan 202614.77%−1.50
31 Dec 202516.27%+1.92
15 Dec 202514.35%−0.18
28 Nov 202514.53%−0.38
14 Nov 202514.91%+1.24
31 Oct 202513.67%−1.04
15 Oct 202514.71%+0.05
30 Sep 202514.66%−0.27
15 Sep 202514.93%+1.27
29 Aug 202513.66%−0.13
15 Aug 202513.79%+0.40
31 Jul 202513.39%+0.10
15 Jul 202513.29%+0.14
30 Jun 202513.15%+0.60
13 Jun 202512.55%+0.32
30 May 202512.23%−0.46
15 May 202512.69%−0.28
30 Apr 202512.97%−0.11
15 Apr 202513.08%−0.62
31 Mar 202513.70%+0.61
14 Mar 202513.09%−0.71
28 Feb 202513.80%+0.03
14 Feb 202513.77%+0.08
31 Jan 202513.69%−0.16
15 Jan 202513.85%+0.45
31 Dec 202413.40%−0.86
13 Dec 202414.26%+0.27
29 Nov 202413.99%−0.54
15 Nov 202414.53%+0.18
31 Oct 202414.35%−0.32
15 Oct 202414.67%−0.34
30 Sep 202415.01%+0.23
13 Sep 202414.78%−0.15
30 Aug 202414.93%+0.53
15 Aug 202414.40%−1.11
31 Jul 202415.51%−1.88
15 Jul 202417.39%+2.19
28 Jun 202415.20%−1.39
14 Jun 202416.59%−2.34
31 May 202418.93%+0.18
15 May 202418.75%+0.66
30 Apr 202418.09%−0.15
15 Apr 202418.24%+0.88
28 Mar 202417.36%+0.05
15 Mar 202417.31%+0.87
29 Feb 202416.44%−0.25
15 Feb 202416.69%−0.15
31 Jan 202416.84%+1.25
12 Jan 202415.59%+0.08
29 Dec 202315.51%+0.63
15 Dec 202314.88%+1.65
30 Nov 202313.23%−0.42
15 Nov 202313.65%+0.60
31 Oct 202313.05%−3.24
13 Oct 202316.29%+0.75
29 Sep 202315.54%+1.18
15 Sep 202314.36%+1.09
31 Aug 202313.27%+0.08
15 Aug 202313.19%+2.60
31 Jul 202310.59%+2.71
14 Jul 20237.88%−0.69
30 Jun 20238.57%+0.78
15 Jun 20237.79%+0.06
31 May 20237.73%−0.60
15 May 20238.33%+0.12
28 Apr 20238.21%+0.11
14 Apr 20238.10%+3.32
31 Mar 20234.78%−0.53
15 Mar 20235.31%+0.33
28 Feb 20234.98%−0.11
15 Feb 20235.09%+0.63
31 Jan 20234.46%+1.35
13 Jan 20233.11%+0.25
30 Dec 20222.86%−0.42
15 Dec 20223.28%−0.77
30 Nov 20224.05%−0.54
15 Nov 20224.59%−1.02
31 Oct 20225.61%−0.65
14 Oct 20226.26%−1.41
30 Sep 20227.67%+0.45
15 Sep 20227.22%+0.09
31 Aug 20227.13%+0.53
15 Aug 20226.60%−0.09
29 Jul 20226.69%+0.03
15 Jul 20226.66%+0.31
30 Jun 20226.35%+1.16
15 Jun 20225.19%+0.73
31 May 20224.46%+1.79
13 May 20222.67%+0.32
29 Apr 20222.35%+0.29
14 Apr 20222.06%+0.34
31 Mar 20221.72%−0.64
15 Mar 20222.36%+0.79
28 Feb 20221.57%+0.04
15 Feb 20221.53%−0.34
31 Jan 20221.87%+0.32
14 Jan 20221.55%+0.07
31 Dec 20211.48%0.00
15 Dec 20211.48%+0.14
30 Nov 20211.34%+0.16
15 Nov 20211.18%−0.30
29 Oct 20211.48%−0.06
15 Oct 20211.54%−0.03
30 Sep 20211.57%+0.23
15 Sep 20211.34%−0.17
31 Aug 20211.51%+0.07
13 Aug 20211.44%+0.14
30 Jul 20211.30%−1.00
15 Jul 20212.30%+0.08
30 Jun 20212.22%−0.25
15 Jun 20212.47%+0.13
28 May 20212.34%−0.10
14 May 20212.44%−0.03
30 Apr 20212.47%−0.06
15 Apr 20212.53%−0.05
31 Mar 20212.58%+0.22
15 Mar 20212.36%−0.26
26 Feb 20212.62%+0.14
12 Feb 20212.48%−0.01
29 Jan 20212.49%−1.38
15 Jan 20213.87%−0.09
31 Dec 20203.96%+0.83
15 Dec 20203.13%+0.37
30 Nov 20202.76%+0.18
13 Nov 20202.58%+0.02
30 Oct 20202.56%+0.13
15 Oct 20202.43%−0.04
30 Sep 20202.47%+0.12
15 Sep 20202.35%−0.04
31 Aug 20202.39%+0.10
14 Aug 20202.29%−0.10
31 Jul 20202.39%−0.17
15 Jul 20202.56%+0.05
30 Jun 20202.51%+0.37
15 Jun 20202.14%+0.01
29 May 20202.13%−0.02
15 May 20202.15%+0.04
30 Apr 20202.11%+0.07
15 Apr 20202.04%−0.03
31 Mar 20202.07%−0.36
13 Mar 20202.43%−0.38
28 Feb 20202.81%+0.15
14 Feb 20202.66%+0.57
31 Jan 20202.09%+0.35
15 Jan 20201.74%+0.57
31 Dec 20191.17%+0.68
13 Dec 20190.49%+0.07
29 Nov 20190.42%−0.01
15 Nov 20190.43%–

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

Frequently asked questions

How shorted is Mirum Pharmaceuticals, Inc. right now?
9.67% of Mirum Pharmaceuticals, Inc.'s (MIRM) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 724th 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 MIRM'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 MIRM's days to cover?
11.99 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.