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HowShorted

How shorted is Aldeyra Therapeutics, Inc.? ALDX

#1,386most shorted US stockof 3,805 ranked stocks, more shorted than 63%

5.97%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.80
5 reports (~10 weeks)
−3.46
days to cover
4.88
Aggregate net short position time series for Aldeyra Therapeutics, 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 Aldeyra Therapeutics, 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
4 May 20234.18% 28 Apr 20236.35% 15 May 2023+2.17
9 Mar 20233.40% 28 Feb 20233.56% 15 Mar 2023+0.16
10 Nov 20223.74% 31 Oct 20223.41% 15 Nov 2022−0.33
5 Aug 20225.25% 29 Jul 20225.39% 15 Aug 2022+0.14
5 May 20225.01% 29 Apr 20224.99% 13 May 2022−0.02
17 Mar 20225.34% 15 Mar 20224.30% 31 Mar 2022−1.04
28 Oct 20216.46% 15 Oct 20216.61% 29 Oct 2021+0.15
5 Aug 202113.00% 30 Jul 20219.57% 13 Aug 2021−3.43

Fails to deliver

The SEC's fails-to-deliver figure for ALDX: 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
3,850
14 Sep 2026
Highest in window
1,839,087
18 Mar 2026
Days with a balance
114
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Aldeyra Therapeutics, 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 1.8M shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20265.97%+0.80
31 Aug 20265.17%−0.34
14 Aug 20265.51%−0.18
31 Jul 20265.69%−0.28
15 Jul 20265.97%−3.46
30 Jun 20269.43%−1.98
15 Jun 202611.41%−1.80
29 May 202613.21%+0.61
15 May 202612.60%+0.36
30 Apr 202612.24%+3.03
15 Apr 20269.21%+0.09
31 Mar 20269.12%−1.57
13 Mar 202610.69%+1.96
27 Feb 20268.73%−0.37
13 Feb 20269.10%+0.37
30 Jan 20268.73%+0.25
15 Jan 20268.48%+0.25
31 Dec 20258.23%−2.07
15 Dec 202510.30%+0.55
28 Nov 20259.75%+0.50
14 Nov 20259.25%+0.44
31 Oct 20258.81%+0.99
15 Oct 20257.82%−0.67
30 Sep 20258.49%−0.49
15 Sep 20258.98%+0.15
29 Aug 20258.83%+0.50
15 Aug 20258.33%−0.10
31 Jul 20258.43%+0.68
15 Jul 20257.75%+0.27
30 Jun 20257.48%−0.05
13 Jun 20257.53%−0.36
30 May 20257.89%−0.07
15 May 20257.96%−0.33
30 Apr 20258.29%+1.07
15 Apr 20257.22%+1.28
31 Mar 20255.94%−0.75
14 Mar 20256.69%+0.64
28 Feb 20256.05%−0.13
14 Feb 20256.18%+0.02
31 Jan 20256.16%−0.16
15 Jan 20256.32%−0.13
31 Dec 20246.45%+0.50
13 Dec 20245.95%+0.22
29 Nov 20245.73%−0.80
15 Nov 20246.53%+0.36
31 Oct 20246.17%+0.44
15 Oct 20245.73%+0.68
30 Sep 20245.05%+0.04
13 Sep 20245.01%−0.22
30 Aug 20245.23%+0.31
15 Aug 20244.92%+0.61
31 Jul 20244.31%−0.28
15 Jul 20244.59%+0.27
28 Jun 20244.32%+0.19
14 Jun 20244.13%+0.15
31 May 20243.98%−0.02
15 May 20244.00%+0.06
30 Apr 20243.94%−0.07
15 Apr 20244.01%+0.53
28 Mar 20243.48%+0.38
15 Mar 20243.10%−0.20
29 Feb 20243.30%+0.03
15 Feb 20243.27%−0.14
31 Jan 20243.41%−0.32
12 Jan 20243.73%−0.13
29 Dec 20233.86%−2.18
15 Dec 20236.04%+0.39
30 Nov 20235.65%+0.28
15 Nov 20235.37%−0.33
31 Oct 20235.70%−5.66
13 Oct 202311.36%+0.83
29 Sep 202310.53%−0.48
15 Sep 202311.01%+0.62
31 Aug 202310.39%−0.43
15 Aug 202310.82%−0.78
31 Jul 202311.60%+0.99
14 Jul 202310.61%−0.75
30 Jun 202311.36%+5.99
15 Jun 20235.37%−0.39
31 May 20235.76%−0.59
15 May 20236.35%+2.17
28 Apr 20234.18%−0.29
14 Apr 20234.47%−0.68
31 Mar 20235.15%+1.59
15 Mar 20233.56%+0.16
28 Feb 20233.40%−0.34
15 Feb 20233.74%+0.29
31 Jan 20233.45%+0.56
13 Jan 20232.89%−0.31
30 Dec 20223.20%−0.03
15 Dec 20223.23%−0.08
30 Nov 20223.31%−0.10
15 Nov 20223.41%−0.33
31 Oct 20223.74%−0.15
14 Oct 20223.89%−1.18
30 Sep 20225.07%+0.56
15 Sep 20224.51%−0.75
31 Aug 20225.26%−0.13
15 Aug 20225.39%+0.14
29 Jul 20225.25%−0.57
15 Jul 20225.82%+0.93
30 Jun 20224.89%−2.00
15 Jun 20226.89%+1.04
31 May 20225.85%+0.86
13 May 20224.99%−0.02
29 Apr 20225.01%+0.38
14 Apr 20224.63%+0.33
31 Mar 20224.30%−1.04
15 Mar 20225.34%−0.31
28 Feb 20225.65%−0.85
15 Feb 20226.50%+1.21
31 Jan 20225.29%+0.87
14 Jan 20224.42%+0.02
31 Dec 20214.40%−1.41
15 Dec 20215.81%−0.13
30 Nov 20215.94%−0.04
15 Nov 20215.98%−0.63
29 Oct 20216.61%+0.15
15 Oct 20216.46%−0.22
30 Sep 20216.68%−0.87
15 Sep 20217.55%−0.87
31 Aug 20218.42%−1.15
13 Aug 20219.57%−3.43
30 Jul 202113.00%+0.72
15 Jul 202112.28%−0.57
30 Jun 202112.85%+3.81
15 Jun 20219.04%−0.14
28 May 20219.18%−1.00
14 May 202110.18%−0.46
30 Apr 202110.64%+0.75
15 Apr 20219.89%+5.87
15 Mar 20214.02%−0.62
26 Feb 20214.64%+0.18
12 Feb 20214.46%−0.56
29 Jan 20215.02%−0.09
15 Jan 20215.11%−0.60
31 Dec 20205.71%+1.88
15 Dec 20203.83%−0.16
30 Nov 20203.99%−0.14
13 Nov 20204.13%+0.06
30 Oct 20204.07%−0.19
15 Oct 20204.26%−0.13
30 Sep 20204.39%+1.60
15 Sep 20202.79%+0.67
31 Aug 20202.12%+0.50
14 Aug 20201.62%−2.55
31 Jul 20204.17%+2.23
15 Jul 20201.94%−0.18
30 Jun 20202.12%−0.87
15 Jun 20202.99%+0.52
29 May 20202.47%+0.20
15 May 20202.27%+0.64
30 Apr 20201.63%+0.25
15 Apr 20201.38%+0.37
31 Mar 20201.01%−0.33
13 Mar 20201.34%−0.22
28 Feb 20201.56%+0.17
14 Feb 20201.39%−0.48
31 Jan 20201.87%−0.26
15 Jan 20202.13%+0.12
31 Dec 20192.01%−0.11
13 Dec 20192.12%+0.08
29 Nov 20192.04%−0.12
15 Nov 20192.16%−0.58
31 Oct 20192.74%−0.36
15 Oct 20193.10%−0.38
30 Sep 20193.48%−0.19
13 Sep 20193.67%+0.11
30 Aug 20193.56%−0.12
15 Aug 20193.68%+0.33
31 Jul 20193.35%−0.83
15 Jul 20194.18%−0.54
28 Jun 20194.72%+0.76
14 Jun 20193.96%−0.26
31 May 20194.22%−0.24
15 May 20194.46%−0.19
30 Apr 20194.65%−0.27
15 Apr 20194.92%+0.66
29 Mar 20194.26%+0.97
15 Mar 20193.29%+0.70
28 Feb 20192.59%+0.01
15 Feb 20192.58%−0.78
31 Jan 20193.36%−0.18
15 Jan 20193.54%+2.06
14 Dec 20181.48%+0.09
30 Nov 20181.39%−0.21
15 Nov 20181.60%−0.67
31 Oct 20182.27%−0.81
15 Oct 20183.08%−0.58
28 Sep 20183.66%+1.74
14 Sep 20181.92%+0.16
31 Aug 20181.76%−0.25
15 Aug 20182.01%+1.76
15 Jun 20180.25%−0.19
31 May 20180.44%−0.44
15 May 20180.88%−0.68
30 Apr 20181.56%−0.39
13 Apr 20181.95%+0.39
29 Mar 20181.56%−0.05
15 Mar 20181.61%+0.19
28 Feb 20181.42%−0.38
15 Feb 20181.80%−0.01
31 Jan 20181.81%−0.15
12 Jan 20181.96%+0.54
29 Dec 20171.42%–

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

Frequently asked questions

How shorted is Aldeyra Therapeutics, Inc. right now?
5.97% of Aldeyra Therapeutics, Inc.'s (ALDX) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 1,386th 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 ALDX'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 ALDX's days to cover?
4.88 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.