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HowShorted

How shorted is Iron Mountain Inc.? IRM

#2,632most shorted US stockof 3,805 ranked stocks, more shorted than 30%

2.66%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.49
5 reports (~10 weeks)
+0.15
days to cover
4.69
Aggregate net short position time series for Iron Mountain 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 Iron Mountain 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 20262.81% 31 Jul 20262.39% 14 Aug 2026−0.42
30 Apr 20262.71% 15 Apr 20262.48% 15 May 2026−0.23
12 Feb 20263.10% 30 Jan 20262.64% 13 Feb 2026−0.46
5 Nov 20252.60% 31 Oct 20253.35% 14 Nov 2025+0.75
6 Aug 20252.37% 31 Jul 20252.85% 15 Aug 2025+0.48
1 May 20253.48% 30 Apr 20253.85% 15 May 2025+0.37
13 Feb 20252.74% 31 Jan 20252.96% 14 Feb 2025+0.22
6 Nov 20243.16% 31 Oct 20242.84% 15 Nov 2024−0.32

Fails to deliver

The SEC's fails-to-deliver figure for IRM: 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
28
8 Sep 2026
Highest in window
49,043
11 Dec 2025
Days with a balance
52
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Iron Mountain 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 49K shares.

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Sector: Real estate · By year: 2018 · 2019 · 2020 · 2021 · 2022 · 2023 · 2024 · 2025 · 2026

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20262.66%+0.49
31 Aug 20262.17%−0.22
14 Aug 20262.39%−0.42
31 Jul 20262.81%+0.03
15 Jul 20262.78%+0.27
30 Jun 20262.51%−0.20
15 Jun 20262.71%+0.26
29 May 20262.45%−0.03
15 May 20262.48%−0.09
30 Apr 20262.57%−0.14
15 Apr 20262.71%−0.06
31 Mar 20262.77%−0.09
13 Mar 20262.86%+0.30
27 Feb 20262.56%−0.08
13 Feb 20262.64%−0.46
30 Jan 20263.10%+0.02
15 Jan 20263.08%−0.18
31 Dec 20253.26%−0.43
15 Dec 20253.69%+0.34
28 Nov 20253.35%0.00
14 Nov 20253.35%+0.75
31 Oct 20252.60%+0.08
15 Oct 20252.52%−0.21
30 Sep 20252.73%−0.21
15 Sep 20252.94%+0.01
29 Aug 20252.93%+0.08
15 Aug 20252.85%+0.48
31 Jul 20252.37%−0.15
15 Jul 20252.52%−0.18
30 Jun 20252.70%−0.85
13 Jun 20253.55%+0.35
30 May 20253.20%−0.65
15 May 20253.85%+0.37
30 Apr 20253.48%+0.27
15 Apr 20253.21%−0.08
31 Mar 20253.29%+0.35
14 Mar 20252.94%−0.13
28 Feb 20253.07%+0.11
14 Feb 20252.96%+0.22
31 Jan 20252.74%−0.04
15 Jan 20252.78%+0.21
31 Dec 20242.57%−0.14
13 Dec 20242.71%−0.14
29 Nov 20242.85%+0.01
15 Nov 20242.84%−0.32
31 Oct 20243.16%+0.11
15 Oct 20243.05%−0.35
30 Sep 20243.40%−0.47
13 Sep 20243.87%+0.49
30 Aug 20243.38%−0.54
15 Aug 20243.92%−0.43
31 Jul 20244.35%−0.69
15 Jul 20245.04%+0.02
28 Jun 20245.02%+0.77
14 Jun 20244.25%+0.62
31 May 20243.63%+0.23
15 May 20243.40%+0.01
30 Apr 20243.39%+0.02
15 Apr 20243.37%+0.01
28 Mar 20243.36%−0.24
15 Mar 20243.60%−0.04
29 Feb 20243.64%0.00
15 Feb 20243.64%+0.19
31 Jan 20243.45%−0.33
12 Jan 20243.78%+0.05
29 Dec 20233.73%−0.47
15 Dec 20234.20%+0.27
30 Nov 20233.93%+0.10
15 Nov 20233.83%−0.28
31 Oct 20234.11%+0.07
13 Oct 20234.04%−0.11
29 Sep 20234.15%−0.48
15 Sep 20234.63%+0.48
31 Aug 20234.15%−0.19
15 Aug 20234.34%+0.01
31 Jul 20234.33%+0.07
14 Jul 20234.26%+0.23
30 Jun 20234.03%−0.73
15 Jun 20234.76%+0.52
31 May 20234.24%−0.09
15 May 20234.33%0.00
28 Apr 20234.33%−0.45
14 Apr 20234.78%+0.17
31 Mar 20234.61%−0.69
15 Mar 20235.30%+0.38
28 Feb 20234.92%+0.01
15 Feb 20234.91%−0.31
31 Jan 20235.22%−0.27
13 Jan 20235.49%−0.01
30 Dec 20225.50%−1.01
15 Dec 20226.51%+0.60
30 Nov 20225.91%−0.08
15 Nov 20225.99%−0.59
31 Oct 20226.58%+0.07
14 Oct 20226.51%+0.14
30 Sep 20226.37%+0.04
15 Sep 20226.33%+0.42
31 Aug 20225.91%0.00
15 Aug 20225.91%+0.05
29 Jul 20225.86%−0.20
15 Jul 20226.06%+0.31
30 Jun 20225.75%−0.33
15 Jun 20226.08%−0.25
31 May 20226.33%−0.38
13 May 20226.71%−0.26
29 Apr 20226.97%−0.15
14 Apr 20227.12%−0.24
31 Mar 20227.36%−0.01
15 Mar 20227.37%−0.09
28 Feb 20227.46%−0.11
15 Feb 20227.57%−0.45
31 Jan 20228.02%−0.64
14 Jan 20228.66%−0.41
31 Dec 20219.07%−0.75
15 Dec 20219.82%−0.36
30 Nov 202110.18%−0.16
15 Nov 202110.34%+0.40
29 Oct 20219.94%−0.09
15 Oct 202110.03%+0.03
30 Sep 202110.00%−0.12
15 Sep 202110.12%+0.54
31 Aug 20219.58%−0.19
13 Aug 20219.77%−0.18
30 Jul 20219.95%+0.05
15 Jul 20219.90%−0.59
30 Jun 202110.49%−1.48
15 Jun 202111.97%+0.41
28 May 202111.56%−0.58
14 May 202112.14%−0.46
30 Apr 202112.60%−0.49
15 Apr 202113.09%+0.13
31 Mar 202112.96%−0.79
15 Mar 202113.75%+1.11
26 Feb 202112.64%+0.56
12 Feb 202112.08%+0.29
29 Jan 202111.79%−5.49
15 Jan 202117.28%+0.04
31 Dec 202017.24%−0.13
15 Dec 202017.37%−1.26
30 Nov 202018.63%+0.10
13 Nov 202018.53%+0.96
30 Oct 202017.57%−1.05
15 Oct 202018.62%−0.13
30 Sep 202018.75%−1.27
15 Sep 202020.02%+0.61
31 Aug 202019.41%+0.30
14 Aug 202019.11%−0.49
31 Jul 202019.60%+0.18
15 Jul 202019.42%−1.16
30 Jun 202020.58%+1.10
15 Jun 202019.48%+0.71
29 May 202018.77%−0.21
15 May 202018.98%+1.27
30 Apr 202017.71%+1.12
15 Apr 202016.59%+0.35
31 Mar 202016.24%+0.33
13 Mar 202015.91%+0.48
28 Feb 202015.43%+0.38
14 Feb 202015.05%+0.59
31 Jan 202014.46%+0.32
15 Jan 202014.14%−0.22
31 Dec 201914.36%+0.37
13 Dec 201913.99%+0.41
29 Nov 201913.58%+0.33
15 Nov 201913.25%+0.91
31 Oct 201912.34%−0.46
15 Oct 201912.80%−0.15
30 Sep 201912.95%−0.81
13 Sep 201913.76%+0.96
30 Aug 201912.80%+0.03
15 Aug 201912.77%−1.26
31 Jul 201914.03%+0.88
15 Jul 201913.15%+0.61
28 Jun 201912.54%−0.56
14 Jun 201913.10%+0.62
31 May 201912.48%+0.27
15 May 201912.21%+0.43
30 Apr 201911.78%+0.06
15 Apr 201911.72%+0.22
29 Mar 201911.50%−0.29
15 Mar 201911.79%+0.86
28 Feb 201910.93%+1.03
15 Feb 20199.90%+0.11
31 Jan 20199.79%+0.36
15 Jan 20199.43%+0.17
31 Dec 20189.26%+0.24
14 Dec 20189.02%+0.44
30 Nov 20188.58%−0.08
15 Nov 20188.66%−0.24
31 Oct 20188.90%+0.33
15 Oct 20188.57%+0.09
28 Sep 20188.48%−0.39
14 Sep 20188.87%+0.34
31 Aug 20188.53%−0.11
15 Aug 20188.64%+0.27
31 Jul 20188.37%+0.45
13 Jul 20187.92%+0.10
29 Jun 20187.82%−0.20
15 Jun 20188.02%+0.47
31 May 20187.55%+0.40
15 May 20187.15%−0.08
30 Apr 20187.23%−0.40
13 Apr 20187.63%−0.19
29 Mar 20187.82%−0.15
15 Mar 20187.97%+0.48
28 Feb 20187.49%+0.03
15 Feb 20187.46%−0.61
31 Jan 20188.07%+0.12
12 Jan 20187.95%−0.08
29 Dec 20178.03%–

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

Frequently asked questions

How shorted is Iron Mountain Inc. right now?
2.66% of Iron Mountain Inc.'s (IRM) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 2,632nd 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 IRM'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 IRM's days to cover?
4.69 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.