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HowShorted

How shorted is Aura Biosciences, Inc.? AURA

#1,193most shorted US stockof 3,805 ranked stocks, more shorted than 68%

6.80%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.82
5 reports (~10 weeks)
−4.01
days to cover
11.66
Aggregate net short position time series for Aura Biosciences, 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 Aura Biosciences, 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
11 Aug 20269.91% 31 Jul 20265.94% 14 Aug 2026−3.97
11 May 20263.42% 30 Apr 20264.92% 15 May 2026+1.50
4 May 20263.42% 30 Apr 20264.92% 15 May 2026+1.50
30 Mar 20263.95% 13 Mar 20264.08% 31 Mar 2026+0.13
13 Nov 20254.71% 31 Oct 20254.60% 14 Nov 2025−0.11
13 Aug 20255.50% 31 Jul 20254.41% 15 Aug 2025−1.09
15 May 20254.31% 30 Apr 20255.26% 30 May 2025+0.95
24 Mar 20252.39% 14 Mar 20252.82% 31 Mar 2025+0.43

Fails to deliver

The SEC's fails-to-deliver figure for AURA: 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
3,602
31 Aug 2026
Highest in window
117,323
29 Jun 2026
Days with a balance
42
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Aura Biosciences, 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 117K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20266.80%+0.82
31 Aug 20265.98%+0.04
14 Aug 20265.94%−3.97
31 Jul 20269.91%+1.17
15 Jul 20268.74%−2.07
30 Jun 202610.81%+2.41
15 Jun 20268.40%+2.53
29 May 20265.87%+0.95
15 May 20264.92%+1.50
30 Apr 20263.42%+0.28
15 Apr 20263.14%−0.94
31 Mar 20264.08%+0.13
13 Mar 20263.95%+0.41
27 Feb 20263.54%−1.00
13 Feb 20264.54%−0.44
30 Jan 20264.98%−0.05
15 Jan 20265.03%+0.03
31 Dec 20255.00%+0.18
15 Dec 20254.82%−0.27
28 Nov 20255.09%+0.49
14 Nov 20254.60%−0.11
31 Oct 20254.71%−0.35
15 Oct 20255.06%+0.01
30 Sep 20255.05%+0.35
15 Sep 20254.70%+0.20
29 Aug 20254.50%+0.09
15 Aug 20254.41%−1.09
31 Jul 20255.50%+0.10
15 Jul 20255.40%+0.09
30 Jun 20255.31%−0.10
13 Jun 20255.41%+0.15
30 May 20255.26%+0.50
15 May 20254.76%+0.45
30 Apr 20254.31%+0.42
15 Apr 20253.89%+1.07
31 Mar 20252.82%+0.43
14 Mar 20252.39%+0.14
28 Feb 20252.25%−0.34
14 Feb 20252.59%+0.16
31 Jan 20252.43%−0.39
15 Jan 20252.82%+0.26
31 Dec 20242.56%+0.43
13 Dec 20242.13%+0.06
29 Nov 20242.07%+0.17
15 Nov 20241.90%−0.38
31 Oct 20242.28%+0.16
15 Oct 20242.12%−0.20
30 Sep 20242.32%−0.33
13 Sep 20242.65%+0.03
30 Aug 20242.62%+0.14
15 Aug 20242.48%−4.25
31 Jul 20246.73%+0.04
15 Jul 20246.69%+0.66
28 Jun 20246.03%+0.20
14 Jun 20245.83%+0.02
31 May 20245.81%+0.35
15 May 20245.46%−0.12
30 Apr 20245.58%+0.36
15 Apr 20245.22%+0.28
28 Mar 20244.94%−0.91
15 Mar 20245.85%+0.27
29 Feb 20245.58%−1.03
15 Feb 20246.61%+0.13
31 Jan 20246.48%−0.39
12 Jan 20246.87%−0.14
29 Dec 20237.01%+0.65
15 Dec 20236.36%−0.27
30 Nov 20236.63%−0.22
15 Nov 20236.85%+0.13
31 Oct 20236.72%−0.30
13 Oct 20237.02%+0.01
29 Sep 20237.01%+0.05
15 Sep 20236.96%−0.05
31 Aug 20237.01%−0.21
15 Aug 20237.22%−0.18
31 Jul 20237.40%+0.01
14 Jul 20237.39%−0.03
30 Jun 20237.42%+0.17
15 Jun 20237.25%+1.42
31 May 20235.83%+1.53
15 May 20234.30%−0.15
28 Apr 20234.45%+0.10
14 Apr 20234.35%+0.22
31 Mar 20234.13%+0.81
15 Mar 20233.32%+0.05
28 Feb 20233.27%+0.59
15 Feb 20232.68%+0.57
31 Jan 20232.11%+0.62
13 Jan 20231.49%−0.86
30 Dec 20222.35%+0.66
15 Dec 20221.69%−1.94
30 Nov 20223.63%+0.07
15 Nov 20223.56%−0.56
31 Oct 20224.12%−0.23
14 Oct 20224.35%−0.17
30 Sep 20224.52%+0.23
15 Sep 20224.29%+0.14
31 Aug 20224.15%−0.35
15 Aug 20224.50%−0.08
29 Jul 20224.58%−0.05
15 Jul 20224.63%+0.45
30 Jun 20224.18%+0.91
15 Jun 20223.27%+0.49
31 May 20222.78%+0.37
13 May 20222.41%+0.21
29 Apr 20222.20%+0.42
14 Apr 20221.78%+0.64
31 Mar 20221.14%+0.48
15 Mar 20220.66%+0.23
28 Feb 20220.43%0.00
15 Feb 20220.43%−0.01
31 Jan 20220.44%+0.09
14 Jan 20220.35%–

Newest first. Scroll inside the table for earlier dates, back to 14 Jan 2022.

Frequently asked questions

How shorted is Aura Biosciences, Inc. right now?
6.80% of Aura Biosciences, Inc.'s (AURA) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 1,193rd 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 AURA'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 AURA's days to cover?
11.66 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.