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HowShorted

How shorted is IRONWOOD PHARMACEUTICALS INC? IRWD

#534most shorted US stockof 3,805 ranked stocks, more shorted than 85%

11.33%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.65
5 reports (~10 weeks)
+1.47
days to cover
13.11
Aggregate net short position time series for IRONWOOD 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 IRONWOOD 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
6 Aug 202610.01% 31 Jul 202610.93% 14 Aug 2026+0.92
7 May 202610.49% 30 Apr 202610.53% 15 May 2026+0.04
25 Feb 20266.84% 13 Feb 20267.92% 27 Feb 2026+1.08
2 Jan 20265.01% 31 Dec 20255.54% 15 Jan 2026+0.53
10 Nov 20252.93% 31 Oct 20254.40% 14 Nov 2025+1.47
7 Aug 20253.31% 31 Jul 20253.74% 15 Aug 2025+0.43
7 May 20255.44% 30 Apr 20255.23% 15 May 2025−0.21
25 Apr 20257.28% 15 Apr 20255.44% 30 Apr 2025−1.84

Fails to deliver

The SEC's fails-to-deliver figure for IRWD: 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
211
4 Sep 2026
Highest in window
74,314
22 Apr 2026
Days with a balance
39
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for IRONWOOD 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 74K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 202611.33%+0.65
31 Aug 202610.68%−0.25
14 Aug 202610.93%+0.92
31 Jul 202610.01%−0.43
15 Jul 202610.44%+0.58
30 Jun 20269.86%+0.20
15 Jun 20269.66%+0.54
29 May 20269.12%−1.41
15 May 202610.53%+0.04
30 Apr 202610.49%−0.67
15 Apr 202611.16%+0.18
31 Mar 202610.98%+2.58
13 Mar 20268.40%+0.48
27 Feb 20267.92%+1.08
13 Feb 20266.84%+1.02
30 Jan 20265.82%+0.28
15 Jan 20265.54%+0.53
31 Dec 20255.01%+0.50
15 Dec 20254.51%−0.08
28 Nov 20254.59%+0.19
14 Nov 20254.40%+1.47
31 Oct 20252.93%+0.04
15 Oct 20252.89%−0.29
30 Sep 20253.18%−0.33
15 Sep 20253.51%−0.22
29 Aug 20253.73%−0.01
15 Aug 20253.74%+0.43
31 Jul 20253.31%−0.72
15 Jul 20254.03%−0.59
30 Jun 20254.62%−0.11
13 Jun 20254.73%−0.35
30 May 20255.08%−0.15
15 May 20255.23%−0.21
30 Apr 20255.44%−1.84
15 Apr 20257.28%+0.25
31 Mar 20257.03%−3.12
14 Mar 202510.15%+2.62
28 Feb 20257.53%+0.84
14 Feb 20256.69%−0.03
31 Jan 20256.72%+0.82
15 Jan 20255.90%+0.14
31 Dec 20245.76%−1.79
13 Dec 20247.55%+0.54
29 Nov 20247.01%+1.66
15 Nov 20245.35%−1.50
31 Oct 20246.85%−0.62
15 Oct 20247.47%+0.09
30 Sep 20247.38%+0.11
13 Sep 20247.27%−1.24
30 Aug 20248.51%−0.26
15 Aug 20248.77%−1.12
31 Jul 20249.89%−0.71
15 Jul 202410.60%−0.77
28 Jun 202411.37%−1.35
14 Jun 202412.72%−1.54
31 May 202414.26%+0.11
15 May 202414.15%+1.52
30 Apr 202412.63%−0.89
15 Apr 202413.52%−0.51
28 Mar 202414.03%+2.04
15 Mar 202411.99%+2.08
29 Feb 20249.91%−0.05
15 Feb 20249.96%+0.72
31 Jan 20249.24%−1.06
12 Jan 202410.30%+0.21
29 Dec 202310.09%−0.80
15 Dec 202310.89%+0.25
30 Nov 202310.64%−0.35
15 Nov 202310.99%−0.15
31 Oct 202311.14%−0.10
13 Oct 202311.24%−0.07
29 Sep 202311.31%+1.91
15 Sep 20239.40%−0.54
31 Aug 20239.94%+0.38
15 Aug 20239.56%−0.18
31 Jul 20239.74%−0.72
14 Jul 202310.46%+1.24
30 Jun 20239.22%−2.01
15 Jun 202311.23%−0.11
31 May 202311.34%+0.68
15 May 202310.66%−0.45
28 Apr 202311.11%−1.95
14 Apr 202313.06%+1.62
31 Mar 202311.44%+0.85
15 Mar 202310.59%+0.10
28 Feb 202310.49%+0.15
15 Feb 202310.34%−0.02
31 Jan 202310.36%−0.04
13 Jan 202310.40%−0.27
30 Dec 202210.67%−0.38
15 Dec 202211.05%+0.30
30 Nov 202210.75%−1.51
15 Nov 202212.26%+1.08
31 Oct 202211.18%−0.19
14 Oct 202211.37%+0.02
30 Sep 202211.35%−0.38
15 Sep 202211.73%−0.13
31 Aug 202211.86%−0.04
15 Aug 202211.90%+0.15
29 Jul 202211.75%+0.37
15 Jul 202211.38%−0.74
30 Jun 202212.12%+2.97
15 Jun 20229.15%−0.39
31 May 20229.54%−0.80
13 May 202210.34%+0.07
29 Apr 202210.27%−0.34
14 Apr 202210.61%+0.53
31 Mar 202210.08%+0.59
15 Mar 20229.49%+1.73
28 Feb 20227.76%−0.54
15 Feb 20228.30%−1.78
31 Jan 202210.08%−0.11
14 Jan 202210.19%−0.21
31 Dec 202110.40%−0.80
15 Dec 202111.20%−1.42
30 Nov 202112.62%−0.19
15 Nov 202112.81%−1.03
29 Oct 202113.84%+1.30
15 Oct 202112.54%0.00
30 Sep 202112.54%+0.24
15 Sep 202112.30%−0.52
31 Aug 202112.82%+0.02
13 Aug 202112.80%+0.21
30 Jul 202112.59%+0.51
15 Jul 202112.08%−0.24
30 Jun 202112.32%−0.47
15 Jun 202112.79%+1.28
28 May 202111.51%−0.51
14 May 202112.02%+0.71
30 Apr 202111.31%+0.04
15 Apr 202111.27%−0.84
31 Mar 202112.11%−0.63
15 Mar 202112.74%+1.61
26 Feb 202111.13%−0.16
12 Feb 202111.29%+0.53
29 Jan 202110.76%−0.65
15 Jan 202111.41%−0.05
31 Dec 202011.46%−0.86
15 Dec 202012.32%−0.45
30 Nov 202012.77%+0.04
13 Nov 202012.73%−1.10
30 Oct 202013.83%+0.66
15 Oct 202013.17%+0.29
30 Sep 202012.88%−0.12
15 Sep 202013.00%−0.33
31 Aug 202013.33%−2.06
14 Aug 202015.39%+0.50
31 Jul 202014.89%−0.69
15 Jul 202015.58%−1.08
30 Jun 202016.66%+0.90
15 Jun 202015.76%+0.55
29 May 202015.21%−0.58
15 May 202015.79%−0.02
30 Apr 202015.81%−0.71
15 Apr 202016.52%−0.68
31 Mar 202017.20%−0.50
13 Mar 202017.70%−0.60
28 Feb 202018.30%+0.16
14 Feb 202018.14%−0.14
31 Jan 202018.28%−0.13
15 Jan 202018.41%+0.13
31 Dec 201918.28%+0.83
13 Dec 201917.45%+0.25
29 Nov 201917.20%+0.97
15 Nov 201916.23%−0.25
31 Oct 201916.48%−0.18
15 Oct 201916.66%−0.54
30 Sep 201917.20%+0.04
13 Sep 201917.16%+0.90
30 Aug 201916.26%+0.51
15 Aug 201915.75%+3.77
31 Jul 201911.98%−0.59
15 Jul 201912.57%+1.20
28 Jun 201911.37%+0.44
14 Jun 201910.93%+0.11
31 May 201910.82%+1.28
15 May 20199.54%−0.29
30 Apr 20199.83%+0.57
15 Apr 20199.26%+0.05
29 Mar 20199.21%−0.01
15 Mar 20199.22%−0.17
28 Feb 20199.39%−0.24
15 Feb 20199.63%–

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

Frequently asked questions

How shorted is IRONWOOD PHARMACEUTICALS INC right now?
11.33% of IRONWOOD PHARMACEUTICALS INC's (IRWD) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 534th 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 IRWD'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 IRWD's days to cover?
13.11 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.