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HowShorted

How shorted is Geron Corporation? GERN

#423most shorted US stockof 3,805 ranked stocks, more shorted than 88%

12.86%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−0.38
5 reports (~10 weeks)
+0.36
days to cover
6.69
Aggregate net short position time series for Geron Corporation

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 Geron Corporation 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 202611.95% 31 Jul 202612.55% 14 Aug 2026+0.60
25 Feb 202610.19% 13 Feb 20269.50% 27 Feb 2026−0.69
5 Nov 202513.36% 31 Oct 202512.16% 14 Nov 2025−1.20
6 Aug 202512.11% 31 Jul 202513.58% 15 Aug 2025+1.47
7 May 202510.56% 30 Apr 202510.55% 15 May 2025−0.01
26 Feb 202511.54% 14 Feb 20259.66% 28 Feb 2025−1.88
13 Jan 202510.76% 31 Dec 202412.19% 15 Jan 2025+1.43
7 Nov 202412.65% 31 Oct 202411.60% 15 Nov 2024−1.05

Fails to deliver

The SEC's fails-to-deliver figure for GERN: 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
191,330
8 Sep 2026
Highest in window
1,968,516
2 Mar 2026
Days with a balance
38
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Geron Corporation 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 2.0M 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 202612.86%−0.38
31 Aug 202613.24%+0.69
14 Aug 202612.55%+0.60
31 Jul 202611.95%+1.05
15 Jul 202610.90%−1.60
30 Jun 202612.50%+0.83
15 Jun 202611.67%+0.48
29 May 202611.19%+0.25
15 May 202610.94%−0.92
30 Apr 202611.86%−1.01
15 Apr 202612.87%+0.86
31 Mar 202612.01%+2.11
13 Mar 20269.90%+0.40
27 Feb 20269.50%−0.69
13 Feb 202610.19%+1.03
30 Jan 20269.16%−1.88
15 Jan 202611.04%−0.12
31 Dec 202511.16%−0.75
15 Dec 202511.91%−0.21
28 Nov 202512.12%−0.04
14 Nov 202512.16%−1.20
31 Oct 202513.36%−0.26
15 Oct 202513.62%−0.45
30 Sep 202514.07%−0.37
15 Sep 202514.44%+0.56
29 Aug 202513.88%+0.30
15 Aug 202513.58%+1.47
31 Jul 202512.11%+1.44
15 Jul 202510.67%+0.78
30 Jun 20259.89%−0.35
13 Jun 202510.24%+0.10
30 May 202510.14%−0.41
15 May 202510.55%−0.01
30 Apr 202510.56%+0.27
15 Apr 202510.29%+0.38
31 Mar 20259.91%+2.36
14 Mar 20257.55%−2.11
28 Feb 20259.66%−1.88
14 Feb 202511.54%−0.80
31 Jan 202512.34%+0.15
15 Jan 202512.19%+1.43
31 Dec 202410.76%+0.09
13 Dec 202410.67%−0.31
29 Nov 202410.98%−0.62
15 Nov 202411.60%−1.05
31 Oct 202412.65%−0.43
15 Oct 202413.08%−0.36
30 Sep 202413.44%+1.58
13 Sep 202411.86%+0.72
30 Aug 202411.14%−0.32
15 Aug 202411.46%+1.71
31 Jul 20249.75%+2.22
15 Jul 20247.53%−0.40
28 Jun 20247.93%−1.19
14 Jun 20249.12%−0.16
31 May 20249.28%+0.19
15 May 20249.09%+0.27
30 Apr 20248.82%−0.28
15 Apr 20249.10%+0.51
28 Mar 20248.59%−0.79
15 Mar 20249.38%+1.11
29 Feb 20248.27%+0.25
15 Feb 20248.02%+0.53
31 Jan 20247.49%+0.16
12 Jan 20247.33%−0.63
29 Dec 20237.96%−0.58
15 Dec 20238.54%+0.36
30 Nov 20238.18%−0.01
15 Nov 20238.19%−0.12
31 Oct 20238.31%−0.28
13 Oct 20238.59%+0.30
29 Sep 20238.29%+0.52
15 Sep 20237.77%+1.41
31 Aug 20236.36%+0.95
15 Aug 20235.41%+0.26
31 Jul 20235.15%−0.02
14 Jul 20235.17%−0.29
30 Jun 20235.46%−0.13
15 Jun 20235.59%−0.10
31 May 20235.69%+1.15
15 May 20234.54%−0.10
28 Apr 20234.64%+0.23
14 Apr 20234.41%−0.42
31 Mar 20234.83%−0.25
15 Mar 20235.08%−1.37
28 Feb 20236.45%+0.23
15 Feb 20236.22%−0.22
31 Jan 20236.44%+0.48
13 Jan 20235.96%−1.70
30 Dec 20227.66%+1.60
15 Dec 20226.06%+1.20
30 Nov 20224.86%−0.13
15 Nov 20224.99%+0.66
31 Oct 20224.33%+0.56
14 Oct 20223.77%+0.24
30 Sep 20223.53%+0.35
15 Sep 20223.18%−0.95
31 Aug 20224.13%−0.88
15 Aug 20225.01%+0.02
29 Jul 20224.99%−0.11
15 Jul 20225.10%−2.52
30 Jun 20227.62%−0.63
15 Jun 20228.25%+0.54
31 May 20227.71%+0.53
13 May 20227.18%+0.34
29 Apr 20226.84%+0.30
14 Apr 20226.54%−1.73
31 Mar 20228.27%+0.35
15 Mar 20227.92%+1.03
28 Feb 20226.89%+0.11
15 Feb 20226.78%+0.95
31 Jan 20225.83%+0.03
14 Jan 20225.80%+0.36
31 Dec 20215.44%−0.60
15 Dec 20216.04%+0.60
30 Nov 20215.44%−0.39
15 Nov 20215.83%−0.02
29 Oct 20215.85%−0.23
15 Oct 20216.08%+0.41
30 Sep 20215.67%−0.70
15 Sep 20216.37%−0.81
31 Aug 20217.18%−0.64
13 Aug 20217.82%+0.19
30 Jul 20217.63%+0.11
15 Jul 20217.52%+0.24
30 Jun 20217.28%−0.74
15 Jun 20218.02%−0.41
28 May 20218.43%−0.18
14 May 20218.61%+0.46
30 Apr 20218.15%−0.46
15 Apr 20218.61%−0.04
31 Mar 20218.65%−2.64
15 Mar 202111.29%−0.44
26 Feb 202111.73%+0.01
12 Feb 202111.72%−0.19
29 Jan 202111.91%−0.06
15 Jan 202111.97%−5.82
31 Dec 202017.79%+1.82
15 Dec 202015.97%+0.44
30 Nov 202015.53%+0.02
13 Nov 202015.51%+0.22
30 Oct 202015.29%+0.97
15 Oct 202014.32%+0.09
30 Sep 202014.23%+3.48
15 Sep 202010.75%−0.19
31 Aug 202010.94%+0.73
14 Aug 202010.21%−0.20
31 Jul 202010.41%+0.03
15 Jul 202010.38%−3.01
30 Jun 202013.39%+3.75
15 Jun 20209.64%+0.98
29 May 20208.66%−7.21
15 May 202015.87%−0.22
30 Apr 202016.09%−0.26
15 Apr 202016.35%−1.35
31 Mar 202017.70%−2.16
13 Mar 202019.86%+0.03
28 Feb 202019.83%−0.37
14 Feb 202020.20%−0.24
31 Jan 202020.44%+0.02
15 Jan 202020.42%+0.33
31 Dec 201920.09%+0.43
13 Dec 201919.66%+0.10
29 Nov 201919.56%−0.73
15 Nov 201920.29%−1.19
31 Oct 201921.48%−0.69
15 Oct 201922.17%+0.43
30 Sep 201921.74%−0.34
13 Sep 201922.08%−0.49
30 Aug 201922.57%+0.01
15 Aug 201922.56%−0.60
31 Jul 201923.16%−2.16
15 Jul 201925.32%+1.17
28 Jun 201924.15%−0.36
14 Jun 201924.51%−0.37
31 May 201924.88%+1.63
15 May 201923.25%+0.04
30 Apr 201923.21%+0.25
15 Apr 201922.96%−0.15
29 Mar 201923.11%+1.06
15 Mar 201922.05%+0.65
28 Feb 201921.40%+0.42
15 Feb 201920.98%+2.08
31 Jan 201918.90%−0.44
15 Jan 201919.34%+0.18
31 Dec 201819.16%−0.43
14 Dec 201819.59%+2.48
30 Nov 201817.11%+1.03
15 Nov 201816.08%−0.28
31 Oct 201816.36%−2.39
15 Oct 201818.75%−14.27
28 Sep 201833.02%−1.53
14 Sep 201834.55%+0.30
31 Aug 201834.25%+1.68
15 Aug 201832.57%+0.81
31 Jul 201831.76%−3.43
13 Jul 201835.19%+2.38
29 Jun 201832.81%+5.06
15 Jun 201827.75%+1.18
31 May 201826.57%+0.67
15 May 201825.90%+0.97
30 Apr 201824.93%+3.16
13 Apr 201821.77%−5.67
29 Mar 201827.44%+4.39
15 Mar 201823.05%+0.75
28 Feb 201822.30%+0.08
15 Feb 201822.22%+1.47
31 Jan 201820.75%+0.13
12 Jan 201820.62%+1.37
29 Dec 201719.25%–

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

Frequently asked questions

How shorted is Geron Corporation right now?
12.86% of Geron Corporation's (GERN) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 423rd 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 GERN'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 GERN's days to cover?
6.69 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.