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HowShorted

How shorted is Iridium Communications Inc.? IRDM

#2,386most shorted US stockof 3,805 ranked stocks, more shorted than 37%

3.21%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.79
5 reports (~10 weeks)
−0.92
days to cover
4.75
Aggregate net short position time series for Iridium Communications 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 Iridium Communications 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
22 Jul 20262.67% 15 Jul 20263.26% 31 Jul 2026+0.59
23 Apr 20265.18% 15 Apr 20265.13% 30 Apr 2026−0.05
12 Feb 20268.73% 30 Jan 20268.40% 13 Feb 2026−0.33
23 Oct 20259.26% 15 Oct 20259.06% 31 Oct 2025−0.20
24 Jul 20256.98% 15 Jul 20257.58% 31 Jul 2025+0.60
22 Apr 20258.15% 15 Apr 20257.13% 30 Apr 2025−1.02
13 Feb 20257.41% 31 Jan 20258.72% 14 Feb 2025+1.31
17 Oct 20245.83% 15 Oct 20246.20% 31 Oct 2024+0.37

Fails to deliver

The SEC's fails-to-deliver figure for IRDM: 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
113
2 Sep 2026
Highest in window
9,565,355
29 Jun 2026
Days with a balance
54
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Iridium Communications 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 9.6M shares.

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Sector: Media & telecom · By year: 2018 · 2019 · 2020 · 2021 · 2022 · 2023 · 2024 · 2025 · 2026

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20263.21%+0.79
31 Aug 20262.42%−0.29
14 Aug 20262.71%−0.55
31 Jul 20263.26%+0.59
15 Jul 20262.67%−1.46
30 Jun 20264.13%−4.84
15 Jun 20268.97%+3.63
29 May 20265.34%−0.02
15 May 20265.36%+0.23
30 Apr 20265.13%−0.05
15 Apr 20265.18%−0.02
31 Mar 20265.20%−1.67
13 Mar 20266.87%+0.20
27 Feb 20266.67%−1.73
13 Feb 20268.40%−0.33
30 Jan 20268.73%−0.97
15 Jan 20269.70%−0.01
31 Dec 20259.71%+0.87
15 Dec 20258.84%+0.94
28 Nov 20257.90%−1.09
14 Nov 20258.99%−0.07
31 Oct 20259.06%−0.20
15 Oct 20259.26%−0.48
30 Sep 20259.74%−2.30
15 Sep 202512.04%+3.87
29 Aug 20258.17%−0.11
15 Aug 20258.28%+0.70
31 Jul 20257.58%+0.60
15 Jul 20256.98%−0.07
30 Jun 20257.05%−3.77
13 Jun 202510.82%+3.80
30 May 20257.02%−0.13
15 May 20257.15%+0.02
30 Apr 20257.13%−1.02
15 Apr 20258.15%−0.43
31 Mar 20258.58%−2.92
14 Mar 202511.50%+2.09
28 Feb 20259.41%+0.69
14 Feb 20258.72%+1.31
31 Jan 20257.41%+0.18
15 Jan 20257.23%+0.21
31 Dec 20247.02%−0.57
13 Dec 20247.59%+0.83
29 Nov 20246.76%−0.09
15 Nov 20246.85%+0.65
31 Oct 20246.20%+0.37
15 Oct 20245.83%+0.58
30 Sep 20245.25%−0.19
13 Sep 20245.44%+1.13
30 Aug 20244.31%+0.47
15 Aug 20243.84%−0.06
31 Jul 20243.90%+0.13
15 Jul 20243.77%+0.03
28 Jun 20243.74%−0.32
14 Jun 20244.06%−0.27
31 May 20244.33%−0.10
15 May 20244.43%+0.37
30 Apr 20244.06%+0.85
15 Apr 20243.21%+0.28
28 Mar 20242.93%+0.15
15 Mar 20242.78%+0.60
29 Feb 20242.18%+0.02
15 Feb 20242.16%−0.01
31 Jan 20242.17%+0.02
12 Jan 20242.15%+0.31
29 Dec 20231.84%−0.22
15 Dec 20232.06%−0.02
30 Nov 20232.08%0.00
15 Nov 20232.08%−0.02
31 Oct 20232.10%+0.22
13 Oct 20231.88%+0.09
29 Sep 20231.79%−0.24
15 Sep 20232.03%+0.01
31 Aug 20232.02%−0.16
15 Aug 20232.18%−0.13
31 Jul 20232.31%+0.37
14 Jul 20231.94%−0.05
30 Jun 20231.99%−1.55
15 Jun 20233.54%+0.28
31 May 20233.26%+0.03
15 May 20233.23%−0.19
28 Apr 20233.42%+0.24
14 Apr 20233.18%+0.14
31 Mar 20233.04%−0.14
15 Mar 20233.18%+0.18
28 Feb 20233.00%+0.29
15 Feb 20232.71%−0.03
31 Jan 20232.74%−0.30
13 Jan 20233.04%−0.06
30 Dec 20223.10%−0.03
15 Dec 20223.13%−0.04
30 Nov 20223.17%−0.78
15 Nov 20223.95%−0.79
31 Oct 20224.74%−0.22
14 Oct 20224.96%+0.24
30 Sep 20224.72%−0.40
15 Sep 20225.12%+0.32
31 Aug 20224.80%−0.36
15 Aug 20225.16%−0.07
29 Jul 20225.23%+0.39
15 Jul 20224.84%−0.08
30 Jun 20224.92%−0.29
15 Jun 20225.21%−0.01
31 May 20225.22%+0.14
13 May 20225.08%+0.02
29 Apr 20225.06%+0.24
14 Apr 20224.82%−0.04
31 Mar 20224.86%+0.01
15 Mar 20224.85%+0.12
28 Feb 20224.73%+0.38
15 Feb 20224.35%−0.53
31 Jan 20224.88%+0.22
14 Jan 20224.66%−0.18
31 Dec 20214.84%+0.02
15 Dec 20214.82%−0.61
30 Nov 20215.43%+0.30
15 Nov 20215.13%−0.06
29 Oct 20215.19%−0.23
15 Oct 20215.42%+0.47
30 Sep 20214.95%−0.15
15 Sep 20215.10%+0.02
31 Aug 20215.08%+0.05
13 Aug 20215.03%+0.13
30 Jul 20214.90%+0.08
15 Jul 20214.82%+0.08
30 Jun 20214.74%−0.34
15 Jun 20215.08%−0.37
28 May 20215.45%−0.01
14 May 20215.46%+1.56
30 Apr 20213.90%+0.34
15 Apr 20213.56%−0.16
31 Mar 20213.72%+0.14
15 Mar 20213.58%+0.84
26 Feb 20212.74%−0.20
12 Feb 20212.94%−0.62
29 Jan 20213.56%−0.51
15 Jan 20214.07%+0.08
31 Dec 20203.99%−0.08
15 Dec 20204.07%+0.05
30 Nov 20204.02%+0.79
13 Nov 20203.23%−0.31
30 Oct 20203.54%−0.66
15 Oct 20204.20%−0.62
30 Sep 20204.82%+0.21
15 Sep 20204.61%−0.20
31 Aug 20204.81%−0.19
14 Aug 20205.00%−0.20
31 Jul 20205.20%−0.87
15 Jul 20206.07%−0.16
30 Jun 20206.23%+0.05
15 Jun 20206.18%+0.27
29 May 20205.91%+0.08
15 May 20205.83%−0.30
30 Apr 20206.13%+0.49
15 Apr 20205.64%−0.14
31 Mar 20205.78%−1.25
13 Mar 20207.03%+0.33
28 Feb 20206.70%−0.36
14 Feb 20207.06%+0.20
31 Jan 20206.86%−0.77
15 Jan 20207.63%−0.10
31 Dec 20197.73%+0.31
13 Dec 20197.42%+0.42
29 Nov 20197.00%+0.51
15 Nov 20196.49%−0.17
31 Oct 20196.66%−0.15
15 Oct 20196.81%+0.30
30 Sep 20196.51%−0.64
13 Sep 20197.15%−0.12
30 Aug 20197.27%+0.41
15 Aug 20196.86%+0.29
31 Jul 20196.57%−0.68
15 Jul 20197.25%+0.25
28 Jun 20197.00%+1.10
14 Jun 20195.90%−0.24
31 May 20196.14%−2.05
15 May 20198.19%−3.99
30 Apr 201912.18%−0.84
15 Apr 201913.02%+0.44
29 Mar 201912.58%+0.24
15 Mar 201912.34%+0.03
28 Feb 201912.31%0.00
15 Feb 201912.31%−0.12
31 Jan 201912.43%−0.20
15 Jan 201912.63%0.00
31 Dec 201812.63%−0.45
14 Dec 201813.08%−1.04
30 Nov 201814.12%+0.07
15 Nov 201814.05%−0.23
31 Oct 201814.28%−0.02
15 Oct 201814.30%−0.66
28 Sep 201814.96%+0.08
14 Sep 201814.88%+0.51
31 Aug 201814.37%−0.76
15 Aug 201815.13%−0.89
31 Jul 201816.02%−0.03
13 Jul 201816.05%−0.39
29 Jun 201816.44%−0.42
15 Jun 201816.86%+0.15
31 May 201816.71%−0.27
15 May 201816.98%−0.15
30 Apr 201817.13%−2.97
13 Apr 201820.10%−0.09
29 Mar 201820.19%−2.60
15 Mar 201822.79%−0.72
28 Feb 201823.51%+0.15
15 Feb 201823.36%−0.09
31 Jan 201823.45%+0.25
12 Jan 201823.20%+0.07
29 Dec 201723.13%–

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

Frequently asked questions

How shorted is Iridium Communications Inc. right now?
3.21% of Iridium Communications Inc.'s (IRDM) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 2,386th 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 IRDM'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 IRDM's days to cover?
4.75 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.