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ProShares UltraShort Nasdaq Biotechnology (BIS) Short Interest Ratio & Short Volume

ProShares UltraShort Nasdaq Biotechnology logo
$8.59 0.00 (0.00%)
Closing price 05/22/2026 03:59 PM Eastern
Extended Trading
$8.59 0.00 (-0.01%)
As of 05/22/2026 05:17 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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ProShares UltraShort Nasdaq Biotechnology Short Interest Overview

As of April 30, 2026, ProShares UltraShort Nasdaq Biotechnology (BIS) had a short interest of 22,771 shares sold short, representing 8.13% of the public float. This marks a 60.01% increase in short interest since the prior report. The short interest ratio (days to cover) is 0.9, meaning it would take 0.9 days of the average trading volume of 16,821 shares to cover all short positions.

Current Short Interest
22,771 shares
Previous Short Interest
14,231 shares
Change Vs. Previous Month
60.01%
Dollar Volume Sold Short
$198.56 thousand
Short Interest Ratio
0.9 Days to Cover
Last Record Date
April 30, 2026
Outstanding Shares
280,000 shares
Short Percent of Float
8.13%
Today's Trading Volume
3,368 shares
Average Trading Volume
16,821 shares
Today's Volume Vs. Average
20%
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Short Interest ChartDays to Cover ChartShort Percent of Float Chart

BIS Short Interest Over Time

BIS Days to Cover Over Time

BIS Percentage of Float Shorted Over Time

ProShares UltraShort Nasdaq Biotechnology 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
4/30/202622,771 shares $198.56 thousand +60.0%8.1%0.87 $8.72
4/15/202614,231 shares $115.56 thousand -9.1%5.1%0.85 $8.12
3/31/202615,661 shares $138.29 thousand +9.1%5.6%0.77 $8.83
3/13/202614,354 shares $133.92 thousand +16.9%4.8%1.31 $9.33
2/27/202612,281 shares $103.28 thousand +12.5%4.1%2.71 $8.41
2/13/202610,921 shares $95.56 thousand -48.1%3.6%0.61 $8.75
1/30/202621,029 shares $189.05 thousand +99.1%7.0%1.16 $8.99
1/15/202610,560 shares $97.89 thousand +59.6%3.8%0.7 $9.27
12/31/20256,618 shares $62.74 thousand +0.3%2.4%0.34 $9.48
12/15/20256,601 shares $63.04 thousand +13.8%3.5%0.48 $9.55
11/28/20255,801 shares $53.34 thousand -58.5%3.1%0.22 $9.20
11/14/202513,972 shares $143.21 thousand +56.6%7.4%0.63 $10.25
10/31/20258,920 shares $96.69 thousand +29.4%4.7%1.84 $10.84
10/15/20256,900 shares $80.49 thousand +27.8%3.6%0.7 $11.67
9/30/20255,400 shares $70.63 thousand -25.0%N/A0.5 $13.08
9/15/20257,200 shares $101.02 thousand +50.0%N/A0.7 $14.03
8/31/20254,800 shares $69.22 thousand -35.1%2.8%0.4 $14.42
8/15/20257,400 shares $105.60 thousand -41.7%N/A0.6 $14.27
7/31/202512,700 shares $201.55 thousand +38.0%7.5%1 $15.87
7/15/20259,200 shares $152.08 thousand +31.4%N/A0.7 $16.53
6/30/20257,000 shares $123.97 thousand -52.4%4.1%0.5 $17.71
6/15/202514,700 shares $254.02 thousand +104.2%8.6%1.2 $17.28
5/31/20257,200 shares $136.66 thousand -24.2%4.8%0.6 $18.98
5/15/20259,500 shares $189.15 thousand +31.9%5.6%0.8 $19.91
4/30/20257,200 shares $129.10 thousand -5.3%N/A0.6 $17.93
4/15/20257,600 shares $153.60 thousand -8.4%4.4%0.6 $20.21
3/31/20258,300 shares $154.71 thousand +18.6%4.2%0.7 $18.64
3/15/20257,000 shares $120.19 thousand -10.3%3.5%0.6 $17.17
2/28/20257,800 shares $129.64 thousand +9.9%3.9%0.6 $16.62
2/15/20257,100 shares $117.65 thousand -17.4%3.6%0.6 $16.57
1/31/20258,600 shares $142.42 thousand -27.1%N/A0.7 $16.56
1/15/202511,800 shares $213.34 thousand -71.8%N/A1 $18.08
12/31/202441,800 shares $760.34 thousand +305.8%N/A3.3 $18.19
12/15/202410,300 shares $178.71 thousand +22.6%N/A0.8 $17.35
11/30/20248,400 shares $132.97 thousand -2.3%N/A0.6 $15.83
11/15/20248,600 shares $152.05 thousand +32.3%N/A0.6 $17.68
10/31/20246,500 shares $103.74 thousand -4.4%N/A0.5 $15.96
10/15/20246,800 shares $101.25 thousand -20.0%N/A0.5 $14.89
9/30/20248,500 shares $127.84 thousand -31.5%N/A0.6 $15.04
9/15/202412,400 shares $178.68 thousand -30.7%N/A1 $14.41
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8/31/202417,900 shares $259.19 thousand +103.4%N/A1.8 $14.48
8/15/20248,800 shares $133.76 thousand -35.8%N/A1.1 $15.20
7/31/202413,700 shares $201.25 thousand +20.2%N/A2 $14.69
7/15/202411,400 shares $168.75 thousand -17.4%N/A1.9 $14.80
6/30/202413,800 shares $229.77 thousand +43.8%N/A2.3 $16.65
6/15/20249,600 shares $163.88 thousand -41.1%N/A1.4 $17.07
5/31/202416,300 shares $292.42 thousand +29.4%N/A2.3 $17.94
5/15/202412,600 shares $219.11 thousand -16.0%N/A1.8 $17.39
4/30/202415,000 shares $299.40 thousand +11.9%N/A2 $19.96
4/15/202413,400 shares $268.67 thousand -30.6%N/A0.7 $20.05
3/31/202419,300 shares $339.29 thousand +144.3%N/A0.8 $17.58
3/15/20247,900 shares $143.62 thousand -2.5%N/A0.3 $18.18
2/29/20248,100 shares $143.09 thousand -35.2%N/A0.4 $17.67
2/15/202412,500 shares $220.13 thousand +0.8%N/A0.6 $17.61
1/31/202412,400 shares $223.06 thousand -10.1%N/A0.6 $17.99
1/15/202413,800 shares $238.19 thousand +14.1%N/A1.5 $17.26
12/31/202312,100 shares $218.65 thousand +40.7%N/A2.6 $18.07
12/15/20238,600 shares $169.08 thousand -4.4%N/A1.8 $19.66
11/30/20239,000 shares $209.52 thousand -8.2%N/A1.9 $23.28
11/15/20239,800 shares $239.12 thousand -36.8%N/A1.9 $24.40
10/31/202315,500 shares $398.51 thousand +23.0%N/A3.3 $25.71
10/15/202312,600 shares $284.76 thousand -21.7%N/A3.6 $22.60
9/30/202316,100 shares $360.80 thousand +11.0%N/A5 $22.41
9/15/202314,500 shares $309.29 thousand -14.2%N/A4.7 $21.33
8/31/202316,900 shares $349.49 thousand +59.4%N/A4.9 $20.68
8/15/202310,600 shares $220.90 thousand No ChangeN/A2.9 $20.84
7/31/202310,600 shares $216.35 thousand +17.8%N/A2.8 $20.41
7/15/20239,000 shares $186.12 thousand -4.3%N/A2.3 $20.68
6/30/20239,400 shares $195.90 thousand -2.1%N/A2.1 $20.84
6/15/20239,600 shares $184.61 thousand -15.0%N/A1.5 $19.23
5/31/202311,300 shares $235.61 thousand -15.7%N/A1.3 $20.85
5/15/202313,400 shares $255.54 thousand -1.5%N/A1.2 $19.07
4/30/202313,600 shares $268.19 thousand -20.0%N/A1.1 $19.72
4/15/202317,000 shares $329.80 thousand -9.6%N/A1.2 $19.40
3/31/202318,800 shares $381.45 thousand -42.5%N/A1.2 $20.29
3/15/202332,700 shares $694.88 thousand +51.4%N/A1.6 $21.25
2/28/202321,600 shares $449.28 thousand +67.4%N/A1.1 $20.80
2/15/202312,900 shares $247.42 thousand -22.8%N/A0.6 $19.18
1/31/202316,700 shares $305.44 thousand +12.1%N/A0.9 $18.29
1/15/202314,900 shares $271.78 thousand -77.5%N/A0.8 $18.24
12/30/202266,300 shares $1.30 million +151.1%N/A3.7 $19.64
12/15/202226,400 shares $497.11 thousand -65.1%N/A1.4 $18.83
11/30/202275,600 shares $1.40 million +132.6%N/A4.6 $18.55
11/15/202232,500 shares $625.30 thousand -35.6%N/A2.1 $19.24
10/31/202250,500 shares $1.06 million -0.4%N/A3.2 $20.94
10/15/202250,700 shares $1.22 million No ChangeN/A2.2 $24.12
9/30/202246,500 shares $1.18 million -2.5%N/A1.6 $25.27
9/15/202247,700 shares $1.10 million +3.9%N/A1.7 $23.08
8/31/202245,900 shares $1.13 million +73.2%N/A1.5 $24.65
8/15/202226,500 shares $533.18 thousand +150.0%N/A0.8 $20.12
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7/31/202210,600 shares $260.87 thousand -21.5%N/A0.3 $24.61
7/15/202213,500 shares $324.54 thousand -84.6%N/A0.4 $24.04
6/30/202287,800 shares $2.37 million +644.1%N/A3.4 $26.95
6/15/202211,800 shares $381.49 thousand -21.9%N/A0.5 $32.33
5/31/202215,100 shares $430.20 thousand -36.0%N/A0.7 $28.49
5/15/202223,600 shares $724.76 thousand +4.9%N/A1.1 $30.71
4/30/202222,500 shares $652.28 thousand +14.2%N/A1.1 $28.99
4/15/202219,700 shares $457.04 thousand +38.7%N/A0.9 $23.20
3/31/202214,200 shares $342.36 thousand -21.6%N/A0.6 $24.11
3/15/202218,100 shares $511.33 thousand -39.9%N/A0.7 $28.25
2/28/202230,100 shares $812.70 thousand +2.4%N/A1.1 $27.00
2/15/202229,400 shares $743.53 thousand -8.7%N/A1.1 $25.29
1/31/202232,200 shares $811.44 thousand +35.9%N/A1.6 $25.20
1/15/202223,700 shares $546.06 thousand +1.3%N/A1.3 $23.04
12/31/202123,400 shares $469.64 thousand -2.1%N/A1.9 $20.07
12/15/202123,900 shares $480.15 thousand -7.4%N/A2 $20.09
11/30/202125,800 shares $515.74 thousand +80.4%N/A2.1 $19.99
11/15/202114,300 shares $282.21 thousand No ChangeN/A1.6 $19.73
10/29/202114,300 shares $266.55 thousand +14.4%N/A1.5 $18.64
10/15/202112,500 shares $238.25 thousand -2.3%N/A1.2 $19.06
9/30/202112,800 shares $230.91 thousand -15.2%N/A1.1 $18.04
9/15/202115,100 shares $250.06 thousand -7.9%N/A1.1 $16.56
8/31/202116,400 shares $271.09 thousand -23.0%N/A1.1 $16.53
8/13/202121,300 shares $366.79 thousand -20.8%N/A1.1 $17.22
7/30/202126,900 shares $491.73 thousand +12.1%N/A1.2 $18.28
7/15/202124,000 shares $470.88 thousand +61.1%N/A1 $19.62
6/30/202114,900 shares $274.01 thousand +19.2%N/A0.5 $18.39
6/15/202112,500 shares $243.50 thousand -57.2%N/A0.4 $19.48
5/28/202129,200 shares $632.18 thousand -10.7%N/A0.7 $21.65

BIS Short Interest - Frequently Asked Questions

Short interest is the volume of ProShares UltraShort Nasdaq Biotechnology shares that have been sold short but have not yet been closed out or covered. As of April 30th, traders have sold 22,771 shares of BIS short. 8.13% of ProShares UltraShort Nasdaq Biotechnology's shares are currently sold short. Learn More on ProShares UltraShort Nasdaq Biotechnology'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. BIS shares currently have a short interest ratio of 0.9. Learn More on ProShares UltraShort Nasdaq Biotechnology'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. 8.13% of ProShares UltraShort Nasdaq Biotechnology's floating shares are currently sold short.

ProShares UltraShort Nasdaq Biotechnology saw a increase in short interest in the month of April. As of April 30th, there was short interest totaling 22,771 shares, an increase of 60.0% from the previous total of 14,231 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.

8.13% of ProShares UltraShort Nasdaq Biotechnology's shares are currently sold short. Here is how the short interest of companies compare to ProShares UltraShort Nasdaq Biotechnology: JPMorgan Healthcare Leaders ETF (0.44%), Horizon Kinetics Medical ETF (0.63%), T. Rowe Price Health Care ETF (1.18%), Global X HealthTech ETF (0.96%), First Trust Nasdaq Pharmaceuticals ETF (3.00%), Invesco Nasdaq Biotechnology ETF (1.17%), ProShares Ultra Nasdaq Biotechnology (1.33%), F/m Emerald Life Sciences Innovation ETF (0.11%), Invesco Dorsey Wright Healthcare Momentum ETF (0.32%), Invesco S&P SmallCap Health Care ETF (0.87%),

As of the most recent reporting period, the following stocks had the largest short interest positions: SPDR S&P 500 ETF Trust ($86.09 billion), Invesco QQQ ($39.89 billion), iShares Russell 2000 ETF ($26.13 billion), Western Digital Corporation ($12.66 billion), Salesforce Inc. ($12.29 billion), Sandisk Corporation ($11.87 billion), SPDR S&P Biotech ETF ($9.82 billion), Lumentum Holdings Inc. ($8.51 billion), iShares 20+ Year Treasury Bond ETF ($7.76 billion), and Bloom Energy Corporation ($7.40 billion). View all of the most shorted stocks.

Short selling BIS is an investing strategy that aims to generate trading profit from ProShares UltraShort Nasdaq Biotechnology as its price is falling. 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 ProShares UltraShort Nasdaq Biotechnology 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 BIS, 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 BIS, twice per month. The most recent reporting period available is April, 30 2026.

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

  • 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.


Related Companies
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This page (NASDAQ:BIS) was last updated on 5/26/2026 by MarketBeat.com Staff.
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