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HowShorted

How shorted was Generation Bio Co.? GBIO

Generation Bio Co. left the US market in 2025. This page is a frozen archive of its reported short interest, ending 31 Dec 2025. The ticker GBIO no longer refers to this company and may since have been reassigned.
0.56%
of shares outstanding reported short · settlement date 31 Dec 2025
vs previous report
−0.15
5 reports (~10 weeks)
−0.85
days to cover
1.00
Aggregate net short position time series for Generation Bio Co.

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 Generation Bio Co. 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 Nov 20250.61% 31 Oct 20250.81% 14 Nov 2025+0.20
12 Aug 20251.46% 31 Jul 20252.90% 29 Aug 2025+1.44
7 May 20251.69% 30 Apr 20252.82% 15 May 2025+1.13
13 Mar 20253.84% 28 Feb 20252.51% 14 Mar 2025−1.33
6 Nov 20242.48% 31 Oct 20242.22% 15 Nov 2024−0.26
7 Aug 20242.76% 31 Jul 20242.81% 15 Aug 2024+0.05
13 May 20242.63% 30 Apr 20242.44% 15 May 2024−0.19
6 Mar 20242.17% 29 Feb 20241.91% 15 Mar 2024−0.26
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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
31 Dec 20250.56%−0.15
15 Dec 20250.71%−0.01
28 Nov 20250.72%−0.09
14 Nov 20250.81%+0.20
31 Oct 20250.61%−0.80
15 Oct 20251.41%−0.44
30 Sep 20251.85%−0.41
15 Sep 20252.26%−0.64
29 Aug 20252.90%+1.44
31 Jul 20251.46%+0.24
15 Jul 20251.22%+0.08
30 Jun 20251.14%−1.67
13 Jun 20252.81%+1.18
30 May 20251.63%−1.19
15 May 20252.82%+1.13
30 Apr 20251.69%−0.82
15 Apr 20252.51%−0.01
31 Mar 20252.52%+0.01
14 Mar 20252.51%−1.33
28 Feb 20253.84%+0.10
14 Feb 20253.74%+0.29
31 Jan 20253.45%+0.22
15 Jan 20253.23%+0.59
31 Dec 20242.64%−0.02
13 Dec 20242.66%+0.37
29 Nov 20242.29%+0.07
15 Nov 20242.22%−0.26
31 Oct 20242.48%−0.12
15 Oct 20242.60%−0.40
30 Sep 20243.00%−0.21
13 Sep 20243.21%+0.40
30 Aug 20242.81%0.00
15 Aug 20242.81%+0.05
31 Jul 20242.76%−0.11
15 Jul 20242.87%+0.34
28 Jun 20242.53%+0.25
14 Jun 20242.28%−0.03
31 May 20242.31%−0.13
15 May 20242.44%−0.19
30 Apr 20242.63%+0.25
15 Apr 20242.38%+0.66
28 Mar 20241.72%−0.19
15 Mar 20241.91%−0.26
29 Feb 20242.17%+0.01
15 Feb 20242.16%−0.03
31 Jan 20242.19%+0.30
12 Jan 20241.89%+0.36
29 Dec 20231.53%−0.52
15 Dec 20232.05%−1.01
30 Nov 20233.06%−1.62
15 Nov 20234.68%+2.03
31 Oct 20232.65%−0.09
13 Oct 20232.74%+0.01
29 Sep 20232.73%−0.38
15 Sep 20233.11%+0.10
31 Aug 20233.01%+0.07
15 Aug 20232.94%−0.06
31 Jul 20233.00%−0.10
14 Jul 20233.10%+0.07
30 Jun 20233.03%−0.28
15 Jun 20233.31%−0.12
31 May 20233.43%+0.22
15 May 20233.21%−0.07
28 Apr 20233.28%−0.17
14 Apr 20233.45%−0.30
31 Mar 20233.75%+1.34
15 Mar 20232.41%+0.23
28 Feb 20232.18%+0.01
15 Feb 20232.17%−0.22
31 Jan 20232.39%−0.08
13 Jan 20232.47%−0.33
30 Dec 20222.80%−0.69
15 Dec 20223.49%−0.05
30 Nov 20223.54%−0.60
15 Nov 20224.14%−0.04
31 Oct 20224.18%−0.31
14 Oct 20224.49%−0.02
30 Sep 20224.51%+0.22
15 Sep 20224.29%−0.06
31 Aug 20224.35%+0.03
15 Aug 20224.32%−0.26
29 Jul 20224.58%−0.27
15 Jul 20224.85%−0.06
30 Jun 20224.91%−0.64
15 Jun 20225.55%−0.23
31 May 20225.78%−0.11
13 May 20225.89%−1.88
29 Apr 20227.77%+0.41
14 Apr 20227.36%+0.30
31 Mar 20227.06%−1.13
15 Mar 20228.19%+0.36
28 Feb 20227.83%−0.03
15 Feb 20227.86%+0.20
31 Jan 20227.66%+0.64
14 Jan 20227.02%+0.45
31 Dec 20216.57%−3.34
15 Dec 20219.91%−0.37
30 Nov 202110.28%−0.15
15 Nov 202110.43%−0.11
29 Oct 202110.54%−0.15
15 Oct 202110.69%+0.14
30 Sep 202110.55%−0.70
15 Sep 202111.25%−0.75
31 Aug 202112.00%+0.19
13 Aug 202111.81%+0.22
30 Jul 202111.59%+0.79
15 Jul 202110.80%+0.54
30 Jun 202110.26%+0.50
15 Jun 20219.76%+1.99
28 May 20217.77%−0.46
14 May 20218.23%+0.21
30 Apr 20218.02%+4.53
15 Mar 20213.49%+0.10
26 Feb 20213.39%−0.01
12 Feb 20213.40%−0.11
29 Jan 20213.51%−2.03
15 Jan 20215.54%+0.59
31 Dec 20204.95%+1.00
15 Dec 20203.95%−0.60
30 Nov 20204.55%+0.51
13 Nov 20204.04%+0.32
30 Oct 20203.72%+0.35
15 Oct 20203.37%+0.31
30 Sep 20203.06%+1.67
15 Sep 20201.39%+0.40
31 Aug 20200.99%+0.05
14 Aug 20200.94%+0.24
31 Jul 20200.70%–

Newest first. Scroll inside the table for earlier dates, back to 31 Jul 2020.

Frequently asked questions

How shorted was Generation Bio Co.?
Generation Bio Co. left the US market in 2025. Its final reported figure was 0.56% of shares outstanding for settlement date 31 Dec 2025, per FINRA's consolidated short interest report; this page preserves its full history.
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 GBIO'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 GBIO's days to cover?
1.00 days for settlement date 31 Dec 2025: 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.