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Altimmune (ALT) Short Interest Ratio & Short Volume

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$2.94 +0.06 (+2.08%)
Closing price 04:00 PM Eastern
Extended Trading
$2.94 0.00 (-0.17%)
As of 07:59 PM Eastern
Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Massive. Learn more.
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Altimmune Short Interest Overview

As of July 31, 2026, Altimmune (ALT) had a short interest of 51.94 million shares sold short, representing 27.14% of the public float. This marks a 7.66% increase in short interest since the prior report. The short interest ratio (days to cover) is 11.5, meaning it would take 11.5 days of the average trading volume of 4.79 million shares to cover all short positions.

Current Short Interest
51,938,259 shares
Previous Short Interest
48,242,342 shares
Change Vs. Previous Month
7.66%
Dollar Volume Sold Short
$147.50 million
Short Interest Ratio
11.5 Days to Cover
Last Record Date
July 31, 2026
Outstanding Shares
194,470,000 shares
Short Percent of Float
27.14%
Today's Trading Volume
3,022,647 shares
Average Trading Volume
4,786,692 shares
Today's Volume Vs. Average
63%
Short Selling Altimmune?
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Short Interest ChartDays to Cover ChartShort Percent of Float Chart

ALT Short Interest Over Time

ALT Days to Cover Over Time

ALT Percentage of Float Shorted Over Time

Altimmune 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
7/31/202651,938,259 shares $147.50 million +7.7%27.1%11.45 $2.84
7/15/202648,242,342 shares $143.76 million +1.3%25.2%12.52 $2.98
6/30/202647,634,141 shares $144.09 million +13.6%24.9%8.07 $3.03
6/15/202641,927,428 shares $110.69 million +7.2%21.9%14.57 $2.64
5/29/202639,121,187 shares $119.32 million +3.9%20.4%14.46 $3.05
5/15/202637,637,361 shares $107.27 million +6.2%19.7%11.02 $2.85
4/30/202635,446,379 shares $92.16 million +23.4%27.7%4.93 $2.60
4/15/202628,734,631 shares $97.70 million -1.8%15.0%13.71 $3.40
3/31/202629,248,014 shares $90.08 million +10.4%15.3%7.65 $3.08
3/13/202626,485,081 shares $92.70 million +3.9%21.3%6.96 $3.50
2/27/202625,499,023 shares $109.90 million +1.5%13.3%9.97 $4.31
2/13/202625,131,694 shares $113.85 million +4.0%13.1%7.24 $4.53
1/30/202624,163,422 shares $135.32 million -8.5%22.4%3.5 $5.60
1/15/202626,407,860 shares $111.97 million +2.3%26.5%4.24 $4.24
12/31/202525,810,012 shares $93.17 million +8.8%25.9%4.69 $3.61
12/15/202523,718,017 shares $125.23 million +2.4%23.8%6.24 $5.28
11/28/202523,157,756 shares $122.27 million -0.6%23.2%7.04 $5.28
11/14/202523,285,097 shares $97.10 million +6.9%27.6%7.12 $4.17
10/31/202521,780,366 shares $88.21 million +1.3%25.8%8.7 $4.05
10/15/202521,500,000 shares $86 million -17.9%25.5%7.8 $4.00
9/30/202526,190,000 shares $98.74 million +4.4%N/A8.7 $3.77
9/15/202525,080,000 shares $90.04 million -6.3%N/A4.8 $3.59
8/31/202526,770,000 shares $102.53 million +5.2%31.7%4.7 $3.83
8/15/202525,460,000 shares $92.42 million -1.2%N/A4.5 $3.63
7/31/202525,760,000 shares $95.05 million -8.3%33.1%4.6 $3.69
7/15/202528,100,000 shares $117.46 million -9.9%N/A5.1 $4.18
6/30/202531,180,000 shares $120.67 million +27.8%40.1%5.9 $3.87
6/15/202524,400,000 shares $168.85 million +11.0%31.4%8.6 $6.92
5/31/202521,980,000 shares $119.35 million -3.0%32.2%8.4 $5.43
5/15/202522,670,000 shares $131.03 million +0.4%33.2%8.8 $5.78
4/30/202522,580,000 shares $118.55 million +0.6%N/A8.9 $5.25
4/15/202522,440,000 shares $101.65 million +2.8%32.9%9.2 $4.53
3/31/202521,820,000 shares $109.10 million -2.8%32.0%8.5 $5.00
3/15/202522,450,000 shares $132.90 million +3.6%32.9%8.6 $5.92
2/28/202521,670,000 shares $144.11 million -3.6%31.8%8.2 $6.65
2/15/202522,470,000 shares $143.13 million -3.6%32.9%8.6 $6.37
1/31/202523,320,000 shares $154.84 million -5.2%N/A7.3 $6.64
1/15/202524,590,000 shares $161.80 million +3.8%N/A7.7 $6.58
12/31/202423,690,000 shares $170.80 million -0.7%N/A7.5 $7.21
12/15/202423,850,000 shares $215.37 million +1.8%N/A7.8 $9.03
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11/30/202423,430,000 shares $200.80 million +2.6%N/A7.7 $8.57
11/15/202422,840,000 shares $173.81 million -0.4%N/A8.4 $7.61
10/31/202422,940,000 shares $154.62 million +3.2%N/A10.6 $6.74
10/15/202422,230,000 shares $156.50 million -0.8%N/A10.1 $7.04
9/30/202422,400,000 shares $137.54 million +2.4%N/A9.3 $6.14
9/15/202421,870,000 shares $172.34 million -0.6%N/A6.9 $7.88
8/31/202422,000,000 shares $147.40 million +1.4%N/A6.7 $6.70
8/15/202421,700,000 shares $135.41 million -2.4%N/A6.5 $6.24
7/31/202422,240,000 shares $141.45 million -1.6%N/A6.3 $6.36
7/15/202422,610,000 shares $178.62 million +1.7%N/A6.4 $7.90
6/30/202422,240,000 shares $147.90 million -3.9%N/A6.2 $6.65
6/15/202423,140,000 shares $141.39 million -1.4%N/A6.5 $6.11
5/31/202423,470,000 shares $176.26 million +1.8%N/A7 $7.51
5/15/202423,060,000 shares $204.54 million +3.4%N/A5.5 $8.87
4/30/202422,310,000 shares $146.13 million +9.5%N/A4.9 $6.55
4/15/202420,370,000 shares $153.79 million +14.9%N/A4.3 $7.55
3/31/202417,730,000 shares $180.49 million +41.7%N/A3.2 $10.18
3/15/202412,510,000 shares $123.35 million +15.7%N/A1.9 $9.86
2/29/202410,810,000 shares $130.80 million -6.4%N/A1.1 $12.10
2/15/202411,550,000 shares $103.37 million +15.4%N/A1 $8.95
1/31/202410,010,000 shares $94.49 million -6.1%N/A0.9 $9.44
1/15/202410,660,000 shares $127.92 million +12.9%N/A1 $12.00
12/31/20239,440,000 shares $106.20 million -14.9%N/A1 $11.25
12/15/202311,090,000 shares $85.06 million +71.9%N/A1.3 $7.67
11/30/20236,450,000 shares $20.38 million -4.2%N/A1 $3.16
11/15/20236,730,000 shares $16.42 million -1.9%N/A5.8 $2.44
10/31/20236,860,000 shares $16.53 million -7.3%N/A5.9 $2.41
10/15/20237,400,000 shares $19.68 million +3.5%N/A6.9 $2.66
9/30/20237,150,000 shares $18.59 million +9.3%N/A6.5 $2.60
9/15/20236,540,000 shares $19.10 million +8.5%N/A5.3 $2.92
8/31/20236,030,000 shares $15.26 million +4.3%N/A3.7 $2.53
8/15/20235,780,000 shares $16.24 million -6.2%N/A3.3 $2.81
7/31/20236,160,000 shares $20.39 million -16.2%N/A3.4 $3.31
7/15/20237,350,000 shares $24.11 million +5.6%N/A4.1 $3.28
6/30/20236,960,000 shares $24.57 million -23.8%N/A3.6 $3.53
6/15/20239,130,000 shares $37.34 million +0.6%N/A4.3 $4.09
5/31/20239,080,000 shares $36.68 million +2.6%N/A4.2 $4.04
5/15/20238,850,000 shares $42.92 million -2.1%N/A4.3 $4.85
4/30/20239,040,000 shares $45.65 million -8.3%N/A4.5 $5.05
4/15/20239,860,000 shares $47.13 million +3.8%N/A4.8 $4.78
3/31/20239,500,000 shares $40.09 million +28.4%N/A4.9 $4.22
3/15/20237,400,000 shares $80.88 million +16.0%N/A3.9 $10.93
2/28/20236,380,000 shares $80.32 million +1.9%N/A4.6 $12.59
2/15/20236,260,000 shares $75.06 million +1.5%N/A4.5 $11.99
1/31/20236,170,000 shares $84.16 million -15.7%N/A4.3 $13.64
1/15/20237,320,000 shares $119.24 million -3.4%N/A5.3 $16.29
12/30/20227,580,000 shares $124.69 million +19.6%N/A5.6 $16.45
12/15/20226,340,000 shares $66.38 million -3.4%N/A4.5 $10.47
11/30/20226,560,000 shares $65.27 million -10.0%N/A2.9 $9.95
11/15/20227,290,000 shares $79.61 million +1.8%N/A3.2 $10.92
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10/31/20227,160,000 shares $89.79 million +1.6%N/A2.9 $12.54
10/15/20227,050,000 shares $73.32 million -8.4%N/A2.9 $10.40
9/30/20227,700,000 shares $98.33 million +13.9%N/A3.1 $12.77
9/15/20226,760,000 shares $97.28 million +9.7%N/A2.6 $14.39
8/31/20226,160,000 shares $136.01 million +26.8%N/A3.3 $22.08
8/15/20224,860,000 shares $85.24 million No ChangeN/A2.9 $17.54
7/31/20224,860,000 shares $58.37 million +10.5%N/A3.2 $12.01
7/15/20224,400,000 shares $49.85 million -26.3%N/A3.1 $11.33
6/30/20225,970,000 shares $69.85 million -3.1%N/A4.5 $11.70
6/15/20226,160,000 shares $51.25 million +56.4%N/A5.4 $8.32
5/31/20223,940,000 shares $19.94 million +2.3%N/A4.7 $5.06
5/15/20223,850,000 shares $19.87 million +27.5%N/A4.5 $5.16
4/30/20223,020,000 shares $13.65 million +6.3%N/A3.6 $4.52
4/15/20222,840,000 shares $14.85 million +7.6%N/A3.3 $5.23
3/31/20222,640,000 shares $16.08 million -36.2%N/A3.2 $6.09
3/15/20224,140,000 shares $24.43 million +5.1%N/A4.8 $5.90
2/28/20223,940,000 shares $29.20 million +9.4%10.5%5.4 $7.41
2/15/20223,600,000 shares $28.58 million +6.8%9.6%5 $7.94
1/31/20223,370,000 shares $27.20 million -26.4%10.0%4.4 $8.07
1/15/20224,580,000 shares $35.91 million +2.0%13.6%6.2 $7.84
12/31/20214,490,000 shares $41.13 million +4.7%13.4%6 $9.16
12/15/20214,290,000 shares $38.95 million -0.5%12.8%4 $9.08
11/30/20214,310,000 shares $45.21 million -9.5%12.8%3.8 $10.49
11/15/20214,760,000 shares $53.12 million -15.2%14.2%3.8 $11.16
10/29/20215,610,000 shares $60.59 million -1.9%16.6%4.2 $10.80
10/15/20215,720,000 shares $68.70 million -6.7%16.9%4.3 $12.01
9/30/20216,130,000 shares $69.33 million -7.8%18.1%4.5 $11.31
9/15/20216,650,000 shares $109.92 million +4.2%19.7%4.1 $16.53
8/31/20216,380,000 shares $95.64 million +21.5%18.9%3.2 $14.99

ALT Short Interest - Frequently Asked Questions

Short interest is the volume of Altimmune shares that have been sold short but have not yet been covered or closed out. As of July 31st, traders have sold 51,938,259 shares of ALT short. 27.14% of Altimmune's shares are currently sold short. Learn More on Altimmune'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. ALT shares currently have a short interest ratio of 11.5. Learn More on Altimmune'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. 27.14% of Altimmune's floating shares are currently sold short.

Altimmune saw a increase in short interest in July. As of July 31st, there was short interest totaling 51,938,259 shares, an increase of 7.7% from the previous total of 48,242,342 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.

27.14% of Altimmune's shares are currently sold short. Here is how the short interest of companies in the industry of "biotechnology" compare to Altimmune: Nuvation Bio Inc. (21.95%), Pharvaris N.V. (1.82%), Sionna Therapeutics, Inc. (9.79%), Hemab Therapeutics Holdings, Inc. (4.36%), Zai Lab Limited Unsponsored ADR (6.04%), Biohaven Ltd. (14.01%), Palvella Therapeutics, Inc. (17.34%), Zenas BioPharma, Inc. (23.87%), SELLAS Life Sciences Group, Inc. (28.33%), ADMA Biologics Inc (9.84%),

As of the most recent reporting period, the following stocks had the largest short interest positions: SPDR S&P 500 ETF Trust ($70.50 billion), Invesco QQQ ($50.36 billion), iShares Russell 2000 ETF ($21.20 billion), Western Digital Corporation ($13.40 billion), SPDR S&P Biotech ETF ($11.59 billion), Nebius Group N.V. ($11.46 billion), iShares 20+ Year Treasury Bond ETF ($7.84 billion), iShares iBoxx $ High Yield Corporate Bond ETF ($7.51 billion), iShares Semiconductor ETF ($6.37 billion), and Financial Select Sector SPDR Fund ($6.34 billion). View all of the most shorted stocks.

Short selling ALT is an investing strategy that aims to generate trading profit from Altimmune as its price is falling. ALT shares are trading up $0.04 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 Altimmune 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 ALT, 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 ALT, twice per month. The most recent reporting period available is July, 31 2026.

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

  • 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 NASDAQ:ALT is sourced from the Financial Industry Regulatory Authority (FINRA), with the most recent report published on 8/11/2026. FINRA publishes updated short interest twice a month.
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