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HowShorted

How shorted is REGENERON PHARMACEUTICALS, INC.? REGN

#2,724most shorted US stockof 3,805 ranked stocks, more shorted than 28%

2.45%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−0.03
5 reports (~10 weeks)
−0.88
days to cover
4.42
Aggregate net short position time series for REGENERON 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 REGENERON 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
30 Jul 20263.34% 15 Jul 20263.29% 31 Jul 2026−0.05
6 Jul 20263.33% 30 Jun 20263.34% 15 Jul 2026+0.01
29 Apr 20262.71% 15 Apr 20263.12% 30 Apr 2026+0.41
8 Apr 20262.41% 31 Mar 20262.71% 15 Apr 2026+0.30
30 Jan 20262.18% 15 Jan 20261.94% 13 Feb 2026−0.24
12 Jan 20262.36% 31 Dec 20252.18% 15 Jan 2026−0.18
28 Oct 20252.76% 15 Oct 20252.66% 31 Oct 2025−0.10
6 Oct 20252.60% 30 Sep 20252.76% 15 Oct 2025+0.16

Fails to deliver

The SEC's fails-to-deliver figure for REGN: 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
341
9 Sep 2026
Highest in window
3,890
4 Feb 2026
Days with a balance
56
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for REGENERON 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 3.9K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20262.45%−0.03
31 Aug 20262.48%+0.15
14 Aug 20262.33%−0.96
31 Jul 20263.29%−0.05
15 Jul 20263.34%+0.01
30 Jun 20263.33%+0.18
15 Jun 20263.15%+0.29
29 May 20262.86%+0.21
15 May 20262.65%−0.47
30 Apr 20263.12%+0.41
15 Apr 20262.71%+0.30
31 Mar 20262.41%+0.09
13 Mar 20262.32%+0.16
27 Feb 20262.16%+0.22
13 Feb 20261.94%−0.12
30 Jan 20262.06%−0.12
15 Jan 20262.18%−0.18
31 Dec 20252.36%−0.25
15 Dec 20252.61%−0.39
28 Nov 20253.00%+0.29
14 Nov 20252.71%+0.05
31 Oct 20252.66%−0.10
15 Oct 20252.76%+0.16
30 Sep 20252.60%−0.22
15 Sep 20252.82%+0.15
29 Aug 20252.67%+0.45
15 Aug 20252.22%+0.06
31 Jul 20252.16%+0.24
15 Jul 20251.92%−0.17
30 Jun 20252.09%+0.21
13 Jun 20251.88%−0.62
30 May 20252.50%−0.09
15 May 20252.59%−0.08
30 Apr 20252.67%+0.26
15 Apr 20252.41%−0.14
31 Mar 20252.55%−0.42
14 Mar 20252.97%+0.62
28 Feb 20252.35%+0.33
14 Feb 20252.02%+0.02
31 Jan 20252.00%+0.07
15 Jan 20251.93%+0.02
31 Dec 20241.91%+0.20
13 Dec 20241.71%+0.07
29 Nov 20241.64%+0.01
15 Nov 20241.63%−0.06
31 Oct 20241.69%+0.13
15 Oct 20241.56%−0.01
30 Sep 20241.57%−0.22
13 Sep 20241.79%−0.11
30 Aug 20241.90%−0.01
15 Aug 20241.91%+0.09
31 Jul 20241.82%+0.10
15 Jul 20241.72%−0.13
28 Jun 20241.85%+0.17
14 Jun 20241.68%+0.09
31 May 20241.59%+0.11
15 May 20241.48%+0.05
30 Apr 20241.43%+0.17
15 Apr 20241.26%−0.03
28 Mar 20241.29%+0.02
15 Mar 20241.27%+0.03
29 Feb 20241.24%−0.01
15 Feb 20241.25%+0.11
31 Jan 20241.14%+0.16
12 Jan 20240.98%0.00
29 Dec 20230.98%−0.14
15 Dec 20231.12%−0.01
30 Nov 20231.13%−0.15
15 Nov 20231.28%+0.08
31 Oct 20231.20%−0.06
13 Oct 20231.26%+0.18
29 Sep 20231.08%−0.26
15 Sep 20231.34%−0.03
31 Aug 20231.37%+0.12
15 Aug 20231.25%+0.01
31 Jul 20231.24%+0.08
14 Jul 20231.16%+0.17
30 Jun 20230.99%−0.13
15 Jun 20231.12%+0.08
31 May 20231.04%−0.07
15 May 20231.11%+0.04
28 Apr 20231.07%−0.04
14 Apr 20231.11%−0.08
31 Mar 20231.19%+0.08
15 Mar 20231.11%+0.01
28 Feb 20231.10%−0.12
15 Feb 20231.22%−0.11
31 Jan 20231.33%+0.04
13 Jan 20231.29%−0.09
30 Dec 20221.38%+0.06
15 Dec 20221.32%−0.10
30 Nov 20221.42%−0.20
15 Nov 20221.62%0.00
31 Oct 20221.62%−0.31
14 Oct 20221.93%−0.16
30 Sep 20222.09%−0.08
15 Sep 20222.17%−0.50
31 Aug 20222.67%−0.02
15 Aug 20222.69%−0.12
29 Jul 20222.81%+0.21
15 Jul 20222.60%+0.08
30 Jun 20222.52%+0.17
15 Jun 20222.35%+0.44
31 May 20221.91%−0.07
13 May 20221.98%+0.02
29 Apr 20221.96%0.00
14 Apr 20221.96%−0.06
31 Mar 20222.02%−0.19
15 Mar 20222.21%+0.15
28 Feb 20222.06%+0.09
15 Feb 20221.97%+0.32
31 Jan 20221.65%−0.04
14 Jan 20221.69%+0.17
31 Dec 20211.52%+0.10
15 Dec 20211.42%+0.05
30 Nov 20211.37%−0.12
15 Nov 20211.49%−0.26
29 Oct 20211.75%+0.10
15 Oct 20211.65%−0.03
30 Sep 20211.68%+0.21
15 Sep 20211.47%+0.20
31 Aug 20211.27%−0.05
13 Aug 20211.32%−0.17
30 Jul 20211.49%−0.24
15 Jul 20211.73%+0.40
30 Jun 20211.33%−0.47
15 Jun 20211.80%−0.18
28 May 20211.98%−0.12
14 May 20212.10%−0.09
30 Apr 20212.19%−0.39
15 Apr 20212.58%+0.52
31 Mar 20212.06%−0.42
15 Mar 20212.48%+0.31
26 Feb 20212.17%+0.20
12 Feb 20211.97%+0.16
29 Jan 20211.81%−0.43
15 Jan 20212.24%+0.13
31 Dec 20202.11%+0.27
15 Dec 20201.84%−0.16
30 Nov 20202.00%+0.11
13 Nov 20201.89%−0.14
30 Oct 20202.03%−0.16
15 Oct 20202.19%+0.26
30 Sep 20201.93%+0.43
15 Sep 20201.50%+0.01
31 Aug 20201.49%−0.02
14 Aug 20201.51%−0.27
31 Jul 20201.78%+0.01
15 Jul 20201.77%−0.12
30 Jun 20201.89%−0.31
15 Jun 20202.20%+0.43
29 May 20201.77%+0.19
15 May 20201.58%−0.08
30 Apr 20201.66%−0.13
15 Apr 20201.79%+0.18
31 Mar 20201.61%−0.72
13 Mar 20202.33%−0.28
28 Feb 20202.61%+0.20
14 Feb 20202.41%−0.22
31 Jan 20202.63%+0.24
15 Jan 20202.39%+0.13
31 Dec 20192.26%+0.02
13 Dec 20192.24%+0.09
29 Nov 20192.15%+0.12
15 Nov 20192.03%+0.10
31 Oct 20191.93%−0.01
15 Oct 20191.94%−0.13
30 Sep 20192.07%−0.05
13 Sep 20192.12%0.00
30 Aug 20192.12%−0.09
15 Aug 20192.21%+0.07
31 Jul 20192.14%–

Newest first. Scroll inside the table for earlier dates, back to 31 Jul 2019.

Frequently asked questions

How shorted is REGENERON PHARMACEUTICALS, INC. right now?
2.45% of REGENERON PHARMACEUTICALS, INC.'s (REGN) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 2,724th 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 REGN'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 REGN's days to cover?
4.42 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.