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HowShorted

How shorted is iBio, Inc.? IBIO

#1,040most shorted US stockof 3,805 ranked stocks, more shorted than 72%

7.68%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−0.41
5 reports (~10 weeks)
−1.77
days to cover
9.99
Aggregate net short position time series for iBio, 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 iBio, 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
28 Aug 202610.12% 14 Aug 20268.09% 31 Aug 2026−2.03
12 May 20269.89% 30 Apr 20266.86% 15 May 2026−3.03
5 Sep 202512.97% 29 Aug 20254.60% 15 Sep 2025−8.37
18 Aug 20256.84% 15 Aug 202512.97% 29 Aug 2025+6.13
2 May 202517.54% 30 Apr 20253.98% 15 May 2025−13.56
10 Feb 20252.47% 31 Jan 20254.60% 14 Feb 2025+2.13
25 Nov 20242.67% 15 Nov 20242.35% 29 Nov 2024−0.32
12 Nov 20243.01% 31 Oct 20242.67% 15 Nov 2024−0.34

Fails to deliver

The SEC's fails-to-deliver figure for IBIO: 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
12,211
28 Aug 2026
Highest in window
1,168,918
11 Dec 2025
Days with a balance
110
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for iBio, 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 1.2M shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20267.68%−0.41
31 Aug 20268.09%−2.03
14 Aug 202610.12%−0.16
31 Jul 202610.28%−0.56
15 Jul 202610.84%+1.39
30 Jun 20269.45%+1.89
15 Jun 20267.56%−0.01
29 May 20267.57%+0.71
15 May 20266.86%−3.03
30 Apr 20269.89%−0.65
15 Apr 202610.54%−1.56
31 Mar 202612.10%−0.04
13 Mar 202612.14%+0.75
27 Feb 202611.39%−0.72
13 Feb 202612.11%+10.01
15 Oct 20252.10%−0.31
30 Sep 20252.41%−2.19
15 Sep 20254.60%−8.37
29 Aug 202512.97%+6.13
15 Aug 20256.84%+3.49
31 Jul 20253.35%+0.51
15 Jul 20252.84%−2.17
13 Jun 20255.01%+1.17
30 May 20253.84%−0.14
15 May 20253.98%−13.56
30 Apr 202517.54%+8.17
15 Apr 20259.37%−2.50
31 Mar 202511.87%+3.25
14 Mar 20258.62%−0.52
28 Feb 20259.14%+4.54
14 Feb 20254.60%+2.13
31 Jan 20252.47%−0.33
15 Jan 20252.80%+0.60
31 Dec 20242.20%−0.76
13 Dec 20242.96%+0.61
29 Nov 20242.35%−0.32
15 Nov 20242.67%−0.34
31 Oct 20243.01%−0.55
15 Oct 20243.56%+1.97
30 Sep 20241.59%+0.59
13 Sep 20241.00%−0.04
30 Aug 20241.04%+0.12
15 Aug 20240.92%+0.04
31 Jul 20240.88%−0.29
15 Jul 20241.17%+0.12
28 Jun 20241.05%−0.51
14 Jun 20241.56%+0.45
31 May 20241.11%+0.18
15 May 20240.93%+0.53
15 Feb 20240.40%−2.79
15 Nov 20233.19%+1.73
31 Oct 20231.46%−0.47
13 Oct 20231.93%+0.47
29 Sep 20231.46%−2.66
15 Sep 20234.12%+2.35
31 Aug 20231.77%+0.11
15 Aug 20231.66%−1.15
31 Jul 20232.81%−0.53
14 Jul 20233.34%−1.43
30 Jun 20234.77%−4.17
15 Jun 20238.94%+3.65
31 May 20235.29%−0.69
15 May 20235.98%−1.80
28 Apr 20237.78%−0.01
14 Apr 20237.79%−1.41
31 Mar 20239.20%−1.76
15 Mar 202310.96%−5.43
28 Feb 202316.39%−1.00
15 Feb 202317.39%+12.45
30 Sep 20224.94%+0.51
15 Sep 20224.43%−0.44
31 Aug 20224.87%−0.88
15 Aug 20225.75%−0.45
29 Jul 20226.20%+0.50
15 Jul 20225.70%−0.17
30 Jun 20225.87%−1.67
15 Jun 20227.54%−0.89
31 May 20228.43%−0.03
13 May 20228.46%+2.22
29 Apr 20226.24%+0.27
14 Apr 20225.97%+0.17
31 Mar 20225.80%+1.06
15 Mar 20224.74%+0.33
28 Feb 20224.41%−0.18
15 Feb 20224.59%−0.53
31 Jan 20225.12%−0.35
14 Jan 20225.47%+0.14
31 Dec 20215.33%+0.67
15 Dec 20214.66%+0.73
30 Nov 20213.93%−1.40
15 Nov 20215.33%+0.08
29 Oct 20215.25%−1.51
15 Oct 20216.76%−0.09
30 Sep 20216.85%−0.43
15 Sep 20217.28%+0.21
31 Aug 20217.07%−0.45
13 Aug 20217.52%+0.39
30 Jul 20217.13%−0.60
15 Jul 20217.73%+0.40
30 Jun 20217.33%−0.71
15 Jun 20218.04%−1.10
28 May 20219.14%+0.45
14 May 20218.69%+0.70
30 Apr 20217.99%+0.40
15 Apr 20217.59%+1.32
31 Mar 20216.27%+1.24
15 Mar 20215.03%+0.29
26 Feb 20214.74%−2.01
12 Feb 20216.75%−0.36
29 Jan 20217.11%+0.24
15 Jan 20216.87%+0.26
31 Dec 20206.61%−0.59
15 Dec 20207.20%−0.35
30 Nov 20207.55%+0.50
13 Nov 20207.05%−0.86
30 Oct 20207.91%+0.35
15 Oct 20207.56%−6.31
30 Sep 202013.87%−3.03
15 Sep 202016.90%+3.37
31 Aug 202013.53%+7.36
14 Aug 20206.17%+3.69
15 Jul 20202.48%−0.92
30 Jun 20203.40%+1.59
15 Jun 20201.81%−0.59
15 May 20202.40%−2.85
30 Apr 20205.25%−4.46
13 Mar 20209.71%+3.62
28 Feb 20206.09%−4.41
14 Feb 202010.50%+8.34
15 Jan 20202.16%+0.66
31 Dec 20191.50%+0.16
29 Nov 20191.34%+0.46
13 Sep 20190.88%+0.27
30 Aug 20190.61%+0.21
15 Aug 20190.40%−0.06
31 Jul 20190.46%−0.36
15 Jul 20190.82%−0.06
28 Jun 20190.88%−0.30
14 Jun 20191.18%−0.06
31 May 20191.24%−0.30
15 May 20191.54%−0.35
30 Apr 20191.89%−0.03
15 Apr 20191.92%−0.23
29 Mar 20192.15%−0.04
15 Mar 20192.19%−0.11
28 Feb 20192.30%+0.13
15 Feb 20192.17%−0.40
31 Jan 20192.57%−0.19
15 Jan 20192.76%−0.08
31 Dec 20182.84%−0.06
14 Dec 20182.90%−0.13
30 Nov 20183.03%−0.04
15 Nov 20183.07%−0.28
31 Oct 20183.35%−0.12
15 Oct 20183.47%−0.24
28 Sep 20183.71%−0.05
14 Sep 20183.76%+1.98
31 May 20181.78%+0.54
15 May 20181.24%+0.34
30 Apr 20180.90%−0.19
13 Apr 20181.09%−0.06
29 Mar 20181.15%+0.20
15 Mar 20180.95%−0.02
28 Feb 20180.97%−0.08
15 Feb 20181.05%+0.01
31 Jan 20181.04%+0.59
12 Jan 20180.45%−0.21
29 Dec 20170.66%–

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

Frequently asked questions

How shorted is iBio, Inc. right now?
7.68% of iBio, Inc.'s (IBIO) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 1,040th 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 IBIO'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 IBIO's days to cover?
9.99 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.