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HowShorted

How shorted is Alto Neuroscience Inc.? ANRO

#594most shorted US stockof 3,805 ranked stocks, more shorted than 84%

10.64%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.86
5 reports (~10 weeks)
+3.10
days to cover
9.08
Aggregate net short position time series for Alto Neuroscience 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 Alto Neuroscience 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
12 Aug 202610.13% 31 Jul 20269.06% 14 Aug 2026−1.07
13 Jul 20267.54% 30 Jun 20269.69% 15 Jul 2026+2.15
13 May 20264.97% 30 Apr 20265.05% 15 May 2026+0.08
16 Mar 20266.21% 13 Mar 20266.42% 31 Mar 2026+0.21
12 Nov 202510.52% 31 Oct 20259.05% 14 Nov 2025−1.47
13 Aug 20257.93% 31 Jul 20256.58% 15 Aug 2025−1.35
14 May 202512.03% 30 Apr 202511.11% 15 May 2025−0.92
20 Mar 202513.95% 14 Mar 202513.63% 31 Mar 2025−0.32

Fails to deliver

The SEC's fails-to-deliver figure for ANRO: 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
581
14 Sep 2026
Highest in window
71,537
2 Apr 2026
Days with a balance
88
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Alto Neuroscience 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 72K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 202610.64%+0.86
31 Aug 20269.78%+0.72
14 Aug 20269.06%−1.07
31 Jul 202610.13%+0.44
15 Jul 20269.69%+2.15
30 Jun 20267.54%+2.46
15 Jun 20265.08%−0.22
29 May 20265.30%+0.25
15 May 20265.05%+0.08
30 Apr 20264.97%−1.89
15 Apr 20266.86%+0.44
31 Mar 20266.42%+0.21
13 Mar 20266.21%−0.37
27 Feb 20266.58%−0.29
13 Feb 20266.87%0.00
30 Jan 20266.87%−0.12
15 Jan 20266.99%−0.09
31 Dec 20257.08%−1.87
15 Dec 20258.95%+0.04
28 Nov 20258.91%−0.14
14 Nov 20259.05%−1.47
31 Oct 202510.52%+2.22
15 Oct 20258.30%+2.24
30 Sep 20256.06%0.00
15 Sep 20256.06%−0.22
29 Aug 20256.28%−0.30
15 Aug 20256.58%−1.35
31 Jul 20257.93%+0.36
15 Jul 20257.57%+0.13
30 Jun 20257.44%−2.88
13 Jun 202510.32%−0.55
30 May 202510.87%−0.24
15 May 202511.11%−0.92
30 Apr 202512.03%−0.05
15 Apr 202512.08%−1.55
31 Mar 202513.63%−0.32
14 Mar 202513.95%+0.14
28 Feb 202513.81%−0.96
14 Feb 202514.77%−0.24
31 Jan 202515.01%−0.02
15 Jan 202515.03%+0.30
31 Dec 202414.73%−0.36
13 Dec 202415.09%−0.03
29 Nov 202415.12%−2.16
15 Nov 202417.28%+0.17
31 Oct 202417.11%−2.74
15 Oct 202419.85%+4.58
30 Sep 202415.27%+3.15
13 Sep 202412.12%+0.76
30 Aug 202411.36%−0.22
15 Aug 202411.58%−2.07
31 Jul 202413.65%+0.95
15 Jul 202412.70%+1.39
28 Jun 202411.31%+0.60
14 Jun 202410.71%+0.74
31 May 20249.97%+0.35
15 May 20249.62%–

Newest first. Scroll inside the table for earlier dates, back to 15 May 2024.

Frequently asked questions

How shorted is Alto Neuroscience Inc. right now?
10.64% of Alto Neuroscience Inc.'s (ANRO) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 594th 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 ANRO'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 ANRO's days to cover?
9.08 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.