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Alto Neuroscience (ANRO) Short Interest Ratio & Short Volume

Alto Neuroscience logo
$25.02 +0.99 (+4.12%)
As of 01:12 PM Eastern
This is a fair market value price provided by Massive. Learn more.
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Alto Neuroscience Short Interest Overview

As of September 15, 2026, Alto Neuroscience (ANRO) had a short interest of 4.17 million shares sold short, representing 11.99% of the public float. This marks a 8.80% increase in short interest since the prior report. The short interest ratio (days to cover) is 9.1, meaning it would take 9.1 days of the average trading volume of 406,211 shares to cover all short positions.

Current Short Interest
4,174,082 shares
Previous Short Interest
3,836,359 shares
Change Vs. Previous Month
8.80%
Dollar Volume Sold Short
$126.37 million
Short Interest Ratio
9.1 Days to Cover
Last Record Date
September 15, 2026
Outstanding Shares
39,242,000 shares
Short Percent of Float
11.99%
Today's Trading Volume
167,635 shares
Average Trading Volume
406,211 shares
Today's Volume Vs. Average
41%
Short Selling Alto Neuroscience?
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Short Interest ChartDays to Cover ChartShort Percent of Float Chart

ANRO Short Interest Over Time

ANRO Days to Cover Over Time

ANRO Percentage of Float Shorted Over Time

Alto Neuroscience Tesla Short Interest History & Recent Changes

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Report DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date
9/15/20264,174,082 shares $126.37 million +8.8%12.0%9.08 $30.28
8/31/20263,836,359 shares $135.42 million +7.9%11.0%8.06 $35.30
8/14/20263,556,066 shares $114.29 million +9.9%10.2%7.47 $32.14
7/31/20263,235,210 shares $87.66 million +4.5%10.4%7.45 $27.10
7/15/20263,096,805 shares $86.42 million +28.5%9.9%4.3 $27.91
6/30/20262,410,038 shares $63.56 million +48.6%7.7%2.99 $26.37
6/15/20261,622,197 shares $34.29 million -4.1%5.2%4.34 $21.14
5/29/20261,692,318 shares $34.05 million +5.0%5.4%5.53 $20.12
5/15/20261,611,876 shares $37.07 million +1.6%5.2%4.69 $23.00
4/30/20261,587,188 shares $40.90 million -27.6%5.6%6.06 $25.77
4/15/20262,190,772 shares $55.45 million +6.8%7.0%5.37 $25.31
3/31/20262,051,993 shares $46.20 million +3.4%6.6%5.55 $22.52
3/13/20261,984,788 shares $44.40 million -2.9%6.2%7.96 $22.37
2/27/20262,043,099 shares $40.05 million -4.3%6.6%10.43 $19.60
2/13/20262,135,475 shares $36.30 million 0.0%6.9%8.34 $17.00
1/30/20262,135,587 shares $33.02 million -1.7%6.9%12.76 $15.46
1/15/20262,171,494 shares $36.98 million -1.3%7.0%10.57 $17.03
12/31/20252,198,907 shares $39.18 million -21.0%7.1%4.48 $17.82
12/15/20252,781,726 shares $47.47 million +0.5%9.0%7.84 $17.06
11/28/20252,767,123 shares $37.84 million -1.6%8.9%7.9 $13.68
11/14/20252,810,725 shares $33.76 million -1.3%9.0%6 $12.01
10/31/20252,847,368 shares $40.51 million +26.7%10.5%1.35 $14.23
10/15/20252,250,000 shares $13.80 million +37.2%9.4%1.6 $6.14
9/30/20251,640,000 shares $6.63 million No Change6.9%1.5 $4.04
9/15/20251,640,000 shares $6.16 million -3.5%7.6%10.1 $3.76
8/31/20251,700,000 shares $6.30 million -4.5%7.9%9 $3.71
8/15/20251,780,000 shares $5.61 million -17.2%8.3%8 $3.15
7/31/20252,150,000 shares $6.59 million +4.9%10.0%9.1 $3.07
7/15/20252,050,000 shares $5.29 million +2.0%9.5%8.1 $2.58
6/30/20252,010,000 shares $4.44 million -28.0%9.4%6.9 $2.21
6/15/20252,790,000 shares $6.74 million -5.1%13.0%11 $2.42
5/31/20252,940,000 shares $7.67 million -2.3%13.7%11.6 $2.61
5/15/20253,010,000 shares $7.34 million -7.7%14.0%9.8 $2.44
4/30/20253,260,000 shares $8.05 million -0.3%14.1%10.3 $2.47
4/15/20253,270,000 shares $7.70 million -11.4%14.1%10.2 $2.36
3/31/20253,690,000 shares $7.99 million -1.9%16.0%11.6 $2.17
3/15/20253,760,000 shares $11.94 million +1.1%16.3%12.4 $3.18
2/28/20253,720,000 shares $10.42 million -6.5%16.2%11.5 $2.80
2/15/20253,980,000 shares $13.39 million -1.7%17.3%14.9 $3.37
1/31/20254,050,000 shares $17.41 million No Change17.7%12.9 $4.30
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1/15/20254,050,000 shares $17.46 million +2.0%17.7%5.9 $4.31
12/31/20243,970,000 shares $16.79 million -2.5%17.3%5.5 $4.23
12/15/20244,070,000 shares $15.59 million -0.3%18.5%5.5 $3.83
11/30/20244,080,000 shares $17.99 million -12.5%18.6%5.2 $4.41
11/15/20244,660,000 shares $21.06 million +1.1%21.2%6 $4.52
10/31/20244,610,000 shares $17.93 million -13.8%20.8%6.3 $3.89
10/15/20245,350,000 shares $75.70 million +29.9%24.1%8.1 $14.15
9/30/20244,120,000 shares $47.05 million +26.0%18.6%13.6 $11.42
9/15/20243,270,000 shares $44.54 million +6.9%14.7%11.7 $13.62
8/31/20243,060,000 shares $39.20 million -1.9%13.8%14.7 $12.81
8/15/20243,120,000 shares $29.30 million -15.0%14.1%17 $9.39
7/31/20243,670,000 shares $39.65 million +7.3%16.6%21.7 $10.81
7/15/20243,420,000 shares $49.59 million No Change15.5%27.4 $14.50

ANRO Short Interest - Frequently Asked Questions

Short interest is the volume of Alto Neuroscience shares that have been sold short but have not yet been closed out or covered. As of September 15th, investors have sold 4,174,082 shares of ANRO short. 11.99% of Alto Neuroscience's shares are currently sold short. Learn More on Alto Neuroscience's current short interest.

The short interest ratio, also known as the "days to cover ratio", is calculated by dividing the number of shares of a stock sold short divided by its average trading volume. A short interest ratio ranging between 1 and 4 generally indicates strong positive sentiment about a stock and a lack of short sellers. A short interest ratio of 10 or greater indicates strong pessimism about a stock. ANRO shares currently have a short interest ratio of 9.1. Learn More on Alto Neuroscience's short interest ratio.

Companies that have a short interest as a percentage of float below 10% indicates positive investor sentiment and few short sellers. Stocks with a short interest percentage above 10% is considered high, suggesting some investors are pessimistic about the stock. Companies with a short interest percentage of 20% or more indicates widespread negative sentiment. 11.99% of Alto Neuroscience's floating shares are currently sold short.

Alto Neuroscience saw a increase in short interest during the month of September. As of September 15th, there was short interest totaling 4,174,082 shares, an increase of 8.8% from the previous total of 3,836,359 shares. Changes in short volume can be used to identify positive and negative investor sentiment. Investors that short sell a stock are betting that its price will decline in the future. An increase in short sale volume suggests bearish (negative) sentiment among investors. A decrease on short sale volume suggests bullish (positive) sentiment.

11.99% of Alto Neuroscience's shares are currently sold short. Here is how the short interest of companies in the industry of "pharmaceuticals" compare to Alto Neuroscience: Regencell Bioscience Holdings Limited (0.17%), Organon & Co. (6.79%), Tarsus Pharmaceuticals, Inc. (15.45%), Arcutis Biotherapeutics, Inc. (16.21%), MBX Biosciences, Inc. (12.44%), HUTCHMED (China) Limited Sponsored ADR (0.14%), Supernus Pharmaceuticals, Inc. (9.37%), Liquidia Corporation (18.59%), Harmony Biosciences Holdings, Inc. (8.93%), Bausch Health Cos Inc. (2.91%),

As of the most recent reporting period, the following stocks had the largest short interest positions: SPDR S&P 500 ETF Trust ($75.21 billion), Invesco QQQ ($46.31 billion), iShares Russell 2000 ETF ($27.98 billion), SPDR S&P Biotech ETF ($11.59 billion), Nebius Group N.V. ($9.70 billion), Canadian Natural Resources Limited ($9.42 billion), iShares 20+ Year Treasury Bond ETF ($8.70 billion), iShares iBoxx $ High Yield Corporate Bond ETF ($8.53 billion), iShares iBoxx $ Investment Grade Corporate Bond ETF ($7.79 billion), and Financial Select Sector SPDR Fund ($7.74 billion). View all of the most shorted stocks.

Short selling ANRO is an investing strategy that aims to generate trading profit from Alto Neuroscience as its price is falling. ANRO shares are trading up $0.48 today. To short a stock, an investor borrows shares, sells them and buys the shares back on the public market later to return it to the lender. Short sellers are betting that a stock will decline in price. If the stock does drop after selling, the short seller buys it back at a lower price and returns it to the lender. The difference between the sell price and the buy price is the trader's profit.

A short squeeze for Alto Neuroscience occurs when it has a large amount of short interest and its stock appreciates in price. This forces short sellers to cover their short interest positions by buying actual shares of ANRO, which in turn drives the price of the stock up even further.

Short interest is typically published by a stock exchange once per month. However, NASDAQ publishes a report for U.S. stocks, including ANRO, twice per month. The most recent reporting period available is September, 15 2026.

Understanding short interest metrics can help you assess how traders are positioning around a stock like ANRO:

  • Shares Sold Short: The total number of shares that have been sold by short sellers but have not yet been covered or closed out. A high number may indicate bearish sentiment.
  • Short Float: The percentage of a company’s publicly available shares (or "float") that are sold short. A higher short float suggests a greater portion of the stock is being bet against.
  • Days to Cover (Short Interest Ratio): This estimates how many days it would take short sellers to cover their positions, based on average daily trading volume. Higher values can signal potential for a short squeeze if buying pressure increases.

These metrics are often used by traders to gauge sentiment, volatility risk, and the potential for price movements based on short covering activity.


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Short Interest Tools

Short interest data for NYSE:ANRO is sourced from the Financial Industry Regulatory Authority (FINRA), with the most recent report published on 9/24/2026. FINRA publishes updated short interest twice a month.
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