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HowShorted

How shorted is LeonaBio, Inc.? LONA

#3,537most shorted US stockof 3,805 ranked stocks, more shorted than 7%

0.25%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−0.18
5 reports (~10 weeks)
−1.56
days to cover
1.00
Aggregate net short position time series for LeonaBio, 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 LeonaBio, 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
14 Aug 20260.43% 31 Jul 20260.43% 31 Aug 20260.00
7 Aug 20252.42% 31 Jul 20252.27% 15 Aug 2025−0.15
9 May 20252.19% 30 Apr 20251.92% 15 May 2025−0.27
27 Feb 20252.30% 14 Feb 20252.27% 28 Feb 2025−0.03
7 Nov 20244.02% 31 Oct 20245.73% 15 Nov 2024+1.71
1 Aug 20242.57% 31 Jul 20242.58% 15 Aug 2024+0.01
15 May 20242.76% 30 Apr 20242.32% 31 May 2024−0.44
22 Feb 20241.71% 15 Feb 20242.06% 29 Feb 2024+0.35

Fails to deliver

The SEC's fails-to-deliver figure for LONA: 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.

Latest balance
500
14 Sep 2026
Highest in window
9,488
20 Jan 2026
Days with a balance
33
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for LeonaBio, 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 9.5K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20260.25%−0.18
31 Aug 20260.43%+0.02
14 Aug 20260.41%−0.02
31 Jul 20260.43%−3.63
31 Dec 20254.06%+2.25
14 Nov 20251.81%−0.63
15 Sep 20252.44%+0.30
29 Aug 20252.14%−0.13
15 Aug 20252.27%−0.15
31 Jul 20252.42%−0.23
15 Jul 20252.65%−0.73
30 Jun 20253.38%−0.42
13 Jun 20253.80%+1.51
30 May 20252.29%+0.37
15 May 20251.92%−0.27
30 Apr 20252.19%+0.07
15 Apr 20252.12%−0.27
31 Mar 20252.39%−0.28
14 Mar 20252.67%+0.40
28 Feb 20252.27%−0.03
14 Feb 20252.30%−0.16
31 Jan 20252.46%−1.08
15 Jan 20253.54%+0.52
31 Dec 20243.02%−0.66
13 Dec 20243.68%−1.00
29 Nov 20244.68%−1.05
15 Nov 20245.73%+1.71
31 Oct 20244.02%−0.03
15 Oct 20244.05%−0.03
30 Sep 20244.08%−0.20
13 Sep 20244.28%+1.70
30 Aug 20242.58%0.00
15 Aug 20242.58%+0.01
31 Jul 20242.57%−0.26
15 Jul 20242.83%−0.04
28 Jun 20242.87%+0.22
14 Jun 20242.65%+0.33
31 May 20242.32%−0.09
15 May 20242.41%−0.35
30 Apr 20242.76%+0.02
15 Apr 20242.74%+0.09
28 Mar 20242.65%+0.08
15 Mar 20242.57%+0.51
29 Feb 20242.06%+0.35
15 Feb 20241.71%−0.18
31 Jan 20241.89%+0.54
12 Jan 20241.35%+0.27
29 Dec 20231.08%−0.21
15 Dec 20231.29%−0.02
30 Nov 20231.31%+0.04
15 Nov 20231.27%−0.13
31 Oct 20231.40%−0.09
13 Oct 20231.49%−0.46
29 Sep 20231.95%−0.16
15 Sep 20232.11%−0.05
31 Aug 20232.16%−0.46
15 Aug 20232.62%−0.50
31 Jul 20233.12%−0.12
14 Jul 20233.24%+0.22
30 Jun 20233.02%−2.61
15 Jun 20235.63%+0.22
31 May 20235.41%0.00
15 May 20235.41%−0.31
28 Apr 20235.72%−0.10
14 Apr 20235.82%−0.60
31 Mar 20236.42%+0.47
15 Mar 20235.95%+0.53
28 Feb 20235.42%+0.29
15 Feb 20235.13%+0.25
31 Jan 20234.88%+0.83
13 Jan 20234.05%0.00
30 Dec 20224.05%−0.08
15 Dec 20224.13%−0.19
30 Nov 20224.32%−0.12
15 Nov 20224.44%−0.30
31 Oct 20224.74%−0.11
14 Oct 20224.85%+0.05
30 Sep 20224.80%−0.11
15 Sep 20224.91%+0.16
31 Aug 20224.75%−0.07
15 Aug 20224.82%+0.11
29 Jul 20224.71%−0.69
15 Jul 20225.40%−2.02
30 Jun 20227.42%−0.92
15 Jun 20228.34%+0.52
31 May 20227.82%+0.11
13 May 20227.71%+0.52
29 Apr 20227.19%+1.22
14 Apr 20225.97%−0.09
31 Mar 20226.06%−1.31
15 Mar 20227.37%+0.86
28 Feb 20226.51%+0.20
15 Feb 20226.31%+0.98
31 Jan 20225.33%−0.15
14 Jan 20225.48%+0.03
31 Dec 20215.45%+0.72
15 Dec 20214.73%−0.49
30 Nov 20215.22%+1.16
15 Nov 20214.06%+0.92
29 Oct 20213.14%+0.28
15 Oct 20212.86%−0.19
30 Sep 20213.05%−0.57
15 Sep 20213.62%+0.62
31 Aug 20213.00%−0.32
13 Aug 20213.32%−0.23
30 Jul 20213.55%+0.01
15 Jul 20213.54%+0.27
30 Jun 20213.27%−1.29
15 Jun 20214.56%+0.83
28 May 20213.73%+1.29
14 May 20212.44%+0.17
30 Apr 20212.27%−0.87
15 Apr 20213.14%+0.63
31 Mar 20212.51%+1.95
15 Dec 20200.56%+0.06
30 Nov 20200.50%+0.22
13 Nov 20200.28%–

Newest first. Scroll inside the table for earlier dates, back to 13 Nov 2020.

Frequently asked questions

How shorted is LeonaBio, Inc. right now?
0.25% of LeonaBio, Inc.'s (LONA) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 3,537th 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 LONA'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 LONA's days to cover?
1.00 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.