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HowShorted

How shorted is REGENXBIO Inc.? RGNX

#489most shorted US stockof 3,805 ranked stocks, more shorted than 87%

12.01%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.65
5 reports (~10 weeks)
−8.26
days to cover
7.66
Aggregate net short position time series for REGENXBIO 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 REGENXBIO 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 202610.90% 31 Jul 202612.42% 14 Aug 2026+1.52
14 May 202612.97% 30 Apr 202613.83% 15 May 2026+0.86
5 Mar 202612.37% 27 Feb 202612.53% 13 Mar 2026+0.16
6 Nov 20258.99% 31 Oct 20259.37% 14 Nov 2025+0.38
7 Aug 202510.86% 31 Jul 202510.83% 15 Aug 2025−0.03
12 May 202510.32% 30 Apr 202512.59% 15 May 2025+2.27
13 Mar 202512.68% 28 Feb 202512.08% 14 Mar 2025−0.60
6 Nov 20249.91% 31 Oct 20249.31% 15 Nov 2024−0.60

Fails to deliver

The SEC's fails-to-deliver figure for RGNX: 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
193
4 Sep 2026
Highest in window
294,805
6 Jan 2026
Days with a balance
32
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for REGENXBIO 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 295K shares.

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

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 202612.01%+0.65
31 Aug 202611.36%−1.06
14 Aug 202612.42%+1.52
31 Jul 202610.90%−5.81
15 Jul 202616.71%−3.56
30 Jun 202620.27%+2.32
15 Jun 202617.95%+1.90
29 May 202616.05%+2.22
15 May 202613.83%+0.86
30 Apr 202612.97%−0.48
15 Apr 202613.45%+0.45
31 Mar 202613.00%+0.47
13 Mar 202612.53%+0.16
27 Feb 202612.37%+0.52
13 Feb 202611.85%+2.22
30 Jan 20269.63%−0.49
15 Jan 202610.12%+0.30
31 Dec 20259.82%−0.27
15 Dec 202510.09%−0.63
28 Nov 202510.72%+1.35
14 Nov 20259.37%+0.38
31 Oct 20258.99%−0.67
15 Oct 20259.66%−0.21
30 Sep 20259.87%−0.16
15 Sep 202510.03%−0.14
29 Aug 202510.17%−0.66
15 Aug 202510.83%−0.03
31 Jul 202510.86%−1.48
15 Jul 202512.34%+0.10
30 Jun 202512.24%+1.23
13 Jun 202511.01%−1.01
30 May 202512.02%−0.57
15 May 202512.59%+2.27
30 Apr 202510.32%−0.16
15 Apr 202510.48%+0.06
31 Mar 202510.42%−1.66
14 Mar 202512.08%−0.60
28 Feb 202512.68%+0.23
14 Feb 202512.45%−0.48
31 Jan 202512.93%+0.65
15 Jan 202512.28%+0.08
31 Dec 202412.20%−0.37
13 Dec 202412.57%+1.95
29 Nov 202410.62%+1.31
15 Nov 20249.31%−0.60
31 Oct 20249.91%−0.18
15 Oct 202410.09%−0.65
30 Sep 202410.74%−1.81
13 Sep 202412.55%+0.26
30 Aug 202412.29%+0.70
15 Aug 202411.59%+1.08
31 Jul 202410.51%+0.74
15 Jul 20249.77%+1.00
28 Jun 20248.77%−0.49
14 Jun 20249.26%+0.50
31 May 20248.76%+0.63
15 May 20248.13%−1.56
30 Apr 20249.69%+0.45
15 Apr 20249.24%+0.27
28 Mar 20248.97%−0.46
15 Mar 20249.43%+0.72
29 Feb 20248.71%−0.78
15 Feb 20249.49%+0.06
31 Jan 20249.43%−0.60
12 Jan 202410.03%+0.59
29 Dec 20239.44%+0.38
15 Dec 20239.06%+0.23
30 Nov 20238.83%−0.40
15 Nov 20239.23%−0.18
31 Oct 20239.41%−0.26
13 Oct 20239.67%+0.57
29 Sep 20239.10%−0.86
15 Sep 20239.96%+0.17
31 Aug 20239.79%−0.12
15 Aug 20239.91%−0.29
31 Jul 202310.20%−0.22
14 Jul 202310.42%+0.12
30 Jun 202310.30%−0.15
15 Jun 202310.45%−0.58
31 May 202311.03%−0.15
15 May 202311.18%+0.27
28 Apr 202310.91%+0.12
14 Apr 202310.79%+0.35
31 Mar 202310.44%+0.18
15 Mar 202310.26%+0.62
28 Feb 20239.64%+1.02
15 Feb 20238.62%+1.04
31 Jan 20237.58%+0.52
13 Jan 20237.06%+0.61
30 Dec 20226.45%+0.56
15 Dec 20225.89%+0.58
30 Nov 20225.31%−0.50
15 Nov 20225.81%−0.36
31 Oct 20226.17%+0.23
14 Oct 20225.94%−0.81
30 Sep 20226.75%−0.06
15 Sep 20226.81%−0.43
31 Aug 20227.24%−0.48
15 Aug 20227.72%−0.19
29 Jul 20227.91%+0.75
15 Jul 20227.16%−0.41
30 Jun 20227.57%+0.14
15 Jun 20227.43%+0.17
31 May 20227.26%−0.13
13 May 20227.39%−1.09
29 Apr 20228.48%+1.42
14 Apr 20227.06%+0.66
31 Mar 20226.40%−0.44
15 Mar 20226.84%−0.51
28 Feb 20227.35%+1.50
15 Feb 20225.85%−1.31
31 Jan 20227.16%−0.04
14 Jan 20227.20%−0.09
31 Dec 20217.29%−0.07
15 Dec 20217.36%−0.15
30 Nov 20217.51%+0.54
15 Nov 20216.97%−0.59
29 Oct 20217.56%+0.54
15 Oct 20217.02%−0.67
30 Sep 20217.69%+0.41
15 Sep 20217.28%−0.02
31 Aug 20217.30%−1.31
13 Aug 20218.61%−0.06
30 Jul 20218.67%+0.48
15 Jul 20218.19%+0.45
30 Jun 20217.74%−0.98
15 Jun 20218.72%+0.24
28 May 20218.48%−0.52
14 May 20219.00%+0.10
30 Apr 20218.90%−0.97
15 Apr 20219.87%−0.31
31 Mar 202110.18%+2.14
15 Mar 20218.04%+0.19
26 Feb 20217.85%+0.74
12 Feb 20217.11%+0.60
29 Jan 20216.51%−0.05
15 Jan 20216.56%−0.84
31 Dec 20207.40%−1.40
15 Dec 20208.80%+0.14
30 Nov 20208.66%−1.59
13 Nov 202010.25%−1.30
30 Oct 202011.55%−0.83
15 Oct 202012.38%+0.75
30 Sep 202011.63%−0.62
15 Sep 202012.25%−0.03
31 Aug 202012.28%+0.31
14 Aug 202011.97%+0.43
31 Jul 202011.54%−0.24
15 Jul 202011.78%+0.31
30 Jun 202011.47%−0.05
15 Jun 202011.52%+0.36
29 May 202011.16%−0.20
15 May 202011.36%+0.50
30 Apr 202010.86%−0.93
15 Apr 202011.79%−0.58
31 Mar 202012.37%+0.54
13 Mar 202011.83%+0.15
28 Feb 202011.68%−0.32
14 Feb 202012.00%−1.38
31 Jan 202013.38%+1.98
15 Jan 202011.40%+0.49
31 Dec 201910.91%−0.30
13 Dec 201911.21%−0.12
29 Nov 201911.33%−0.29
15 Nov 201911.62%−0.85
31 Oct 201912.47%+0.18
15 Oct 201912.29%+0.97
30 Sep 201911.32%+1.50
13 Sep 20199.82%+1.07
30 Aug 20198.75%−1.69
15 Aug 201910.44%−0.12
31 Jul 201910.56%−0.06
15 Jul 201910.62%+0.42
28 Jun 201910.20%+1.22
14 Jun 20198.98%−2.15
31 May 201911.13%+0.77
15 May 201910.36%+1.30
30 Apr 20199.06%+0.45
15 Apr 20198.61%−1.22
29 Mar 20199.83%−0.10
15 Mar 20199.93%+0.86
28 Feb 20199.07%+1.59
15 Feb 20197.48%+0.47
31 Jan 20197.01%+0.03
15 Jan 20196.98%+0.34
31 Dec 20186.64%−0.34
14 Dec 20186.98%+0.82
30 Nov 20186.16%+0.11
15 Nov 20186.05%−1.52
31 Oct 20187.57%−1.54
15 Oct 20189.11%−0.11
28 Sep 20189.22%+1.76
14 Sep 20187.46%−0.76
31 Aug 20188.22%−0.91
15 Aug 20189.13%−1.03
31 Jul 201810.16%−0.90
13 Jul 201811.06%+0.31
29 Jun 201810.75%−0.55
15 Jun 201811.30%+3.53
31 May 20187.77%+0.40
15 May 20187.37%−0.35
30 Apr 20187.72%+0.14
13 Apr 20187.58%+1.00
29 Mar 20186.58%+0.11
15 Mar 20186.47%−0.97
28 Feb 20187.44%+0.03
15 Feb 20187.41%+2.93
31 Jan 20184.48%−0.50
12 Jan 20184.98%+0.82
29 Dec 20174.16%–

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

Frequently asked questions

How shorted is REGENXBIO Inc. right now?
12.01% of REGENXBIO Inc.'s (RGNX) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 489th 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 RGNX'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 RGNX's days to cover?
7.66 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.