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Bio-Rad Laboratories (BIO) Short Interest Ratio & Short Volume

Bio-Rad Laboratories logo
$390.10 +8.34 (+2.18%)
Closing price 08/25/2026 03:59 PM Eastern
Extended Trading
$391.12 +1.02 (+0.26%)
As of 07:16 AM 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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Bio-Rad Laboratories Short Interest Overview

As of August 14, 2026, Bio-Rad Laboratories (BIO) had a short interest of 1.33 million shares sold short, representing 7.13% of the public float. This marks a -5.99% decrease in short interest since the prior report. The short interest ratio (days to cover) is 4.8, meaning it would take 4.8 days of the average trading volume of 287,615 shares to cover all short positions.

Current Short Interest
1,327,739 shares
Previous Short Interest
1,412,268 shares
Change Vs. Previous Month
-5.99%
Dollar Volume Sold Short
$472.09 million
Short Interest Ratio
4.8 Days to Cover
Last Record Date
August 14, 2026
Outstanding Shares
26,740,000 shares
Short Percent of Float
7.13%
Today's Trading Volume
295,716 shares
Average Trading Volume
287,615 shares
Today's Volume Vs. Average
103%
Short Selling Bio-Rad Laboratories?
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Short Interest ChartDays to Cover ChartShort Percent of Float Chart

BIO Short Interest Over Time

BIO Days to Cover Over Time

BIO Percentage of Float Shorted Over Time

Bio-Rad Laboratories 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
8/14/20261,327,739 shares $472.09 million -6.0%7.1%4.82 $355.56
7/31/20261,412,268 shares $459.67 million -9.4%7.6%4.29 $325.48
7/15/20261,559,452 shares $461.85 million +2.8%8.4%5.96 $296.16
6/30/20261,517,121 shares $444.22 million -0.3%8.1%4.08 $292.81
6/15/20261,521,346 shares $440.19 million +1.0%8.2%4.38 $289.34
5/29/20261,506,093 shares $470.99 million +12.3%8.1%2.61 $312.72
5/15/20261,340,805 shares $332.06 million +22.8%7.2%2.92 $247.66
4/30/20261,091,991 shares $305.37 million +2.3%5.9%3.69 $279.65
4/15/20261,067,080 shares $315.16 million -12.1%5.7%4.26 $295.35
3/31/20261,214,228 shares $338.22 million +20.5%6.5%3.39 $278.54
3/13/20261,008,034 shares $265.03 million +6.4%4.5%3.79 $262.91
2/27/2026947,436 shares $264.04 million -0.3%5.1%3.08 $278.69
2/13/2026950,646 shares $244.19 million +16.1%5.1%2.85 $256.87
1/30/2026819,074 shares $240.49 million +3.4%3.7%3.34 $293.61
1/15/2026792,425 shares $255.21 million -8.3%3.6%3.54 $322.06
12/31/2025864,116 shares $262.36 million -3.9%3.9%5.25 $303.62
12/15/2025898,989 shares $276.43 million -9.0%4.1%5.55 $307.49
11/28/2025987,606 shares $320.83 million +13.8%4.5%5.59 $324.86
11/14/2025867,843 shares $272.59 million -6.8%3.9%5.22 $314.10
10/31/2025931,212 shares $298.54 million -16.7%4.1%2.93 $320.59
10/15/20251,120,000 shares $342.12 million +34.3%6.1%4.4 $305.46
9/30/2025833,900 shares $234.05 million -24.9%4.6%3.2 $280.67
9/15/20251,110,000 shares $311.43 million +11.0%6.1%4.1 $280.57
8/31/20251,000,000 shares $298.39 million No Change5.5%3.1 $298.39
8/15/20251,000,000 shares $285.71 million +9.0%5.5%2.9 $285.71
7/31/2025917,100 shares $221.61 million +2.6%5.0%2.6 $241.64
7/15/2025894,300 shares $221.36 million -0.1%4.9%2.6 $247.52
6/30/2025894,800 shares $216.23 million +0.5%4.9%2.4 $241.65
6/15/2025890,800 shares $202.59 million -27.0%4.8%2.3 $227.43
5/31/20251,220,000 shares $276.64 million -7.6%6.6%3.2 $226.75
5/15/20251,320,000 shares $320.68 million +23.4%7.2%3.6 $242.94
4/30/20251,070,000 shares $260.84 million -5.3%5.8%2.8 $243.78
4/15/20251,130,000 shares $277.11 million +59.1%5.9%3.2 $245.23
3/31/2025710,400 shares $173.54 million -29.0%3.7%2.2 $244.29
3/15/20251,000,000 shares $255.34 million +15.9%5.2%3.6 $255.34
2/28/2025862,700 shares $228.27 million +41.4%4.5%3.7 $264.60
2/15/2025610,000 shares $168.70 million +4.5%3.2%3 $276.55
1/31/2025583,500 shares $211.10 million -11.9%3.1%3.3 $361.79
1/15/2025662,300 shares $227.21 million +1.0%3.5%3.6 $343.06
12/31/2024655,500 shares $215.34 million +18.8%3.4%3.6 $328.51
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10/31/2024651,700 shares $233.43 million -20.8%3.4%2.2 $358.19
10/15/2024823,100 shares $281.63 million -3.3%4.3%2.8 $342.16
9/30/2024851,300 shares $285.10 million -36.9%4.5%2.7 $334.90
9/15/20241,350,000 shares $440.40 million +28.6%7.1%4 $326.22
8/31/20241,050,000 shares $354.19 million +11.7%5.5%4 $337.32
8/15/2024940,000 shares $306.41 million -26.0%4.9%3.7 $325.97
7/31/20241,270,000 shares $429.84 million -10.6%6.6%4.9 $338.46
7/15/20241,420,000 shares $429.00 million +10.9%7.2%5.6 $302.11
6/30/20241,280,000 shares $349.58 million +47.6%6.5%5.1 $273.11
6/15/2024867,500 shares $244.86 million +15.3%4.4%3.6 $282.26
5/31/2024752,200 shares $215.78 million +15.1%3.8%3.7 $286.86
5/15/2024653,400 shares $196.65 million -10.9%3.3%3.2 $300.97
4/30/2024733,100 shares $197.75 million +6.5%3.7%3.4 $269.75
4/15/2024688,500 shares $206.83 million +21.9%3.5%3.3 $300.41
3/31/2024564,800 shares $195.35 million -2.5%2.9%2.8 $345.87
3/15/2024579,300 shares $193.20 million +15.1%2.9%2.9 $333.51
2/29/2024503,400 shares $164.05 million -14.3%2.5%2.2 $325.88
2/15/2024587,100 shares $193.18 million +11.5%3.0%2.5 $329.04
1/31/2024526,700 shares $169.01 million +1.0%2.6%2 $320.89
1/15/2024521,300 shares $166.07 million +15.0%2.6%1.8 $318.56
12/31/2023453,400 shares $146.40 million -9.9%2.2%1.6 $322.89
12/15/2023503,300 shares $154.07 million -22.5%2.5%1.8 $306.12
11/30/2023649,300 shares $198.13 million +13.5%3.2%2.6 $305.14
11/15/2023572,100 shares $175.57 million +36.9%2.8%2.4 $306.89
10/31/2023418,000 shares $115.06 million +23.9%2.0%2.1 $275.27
10/15/2023337,300 shares $116.28 million +1.8%1.7%1.8 $344.73
9/30/2023331,500 shares $118.83 million -14.7%1.6%1.9 $358.45
9/15/2023388,500 shares $146.17 million -10.7%1.9%2.1 $376.23
8/31/2023435,100 shares $174.13 million +6.3%2.1%2.2 $400.20
8/15/2023409,500 shares $161.70 million +21.8%2.0%1.9 $394.88
7/31/2023336,300 shares $136.30 million +1.1%1.6%1.3 $405.28
7/15/2023332,800 shares $131.98 million +17.6%1.6%1.5 $396.57
6/30/2023283,100 shares $107.27 million +0.6%1.4%1.4 $378.90
6/15/2023281,400 shares $106.67 million -26.7%1.3%1.4 $379.06
5/31/2023383,800 shares $143.29 million +31.8%1.8%2 $373.35
5/15/2023291,200 shares $111.17 million +23.2%1.4%1.5 $381.75
4/30/2023236,400 shares $106.57 million -13.9%1.1%1.3 $450.79
4/15/2023274,400 shares $131.51 million +3.5%1.3%1.7 $479.25
3/31/2023265,200 shares $127.04 million -26.8%1.3%1.6 $479.02
3/15/2023362,400 shares $173.23 million +29.9%1.7%2.2 $478.00
2/28/2023279,000 shares $133.32 million +13.8%1.3%1.7 $477.84
2/15/2023245,100 shares $112.87 million -1.9%1.2%1.5 $460.52
1/31/2023249,900 shares $116.82 million -10.1%1.2%1.4 $467.46
1/15/2023278,100 shares $126.59 million +10.1%1.3%1.3 $455.20
12/30/2022252,500 shares $106.17 million +8.8%1.2%1.1 $420.49
12/15/2022232,100 shares $97.59 million +17.2%1.1%0.9 $420.48
11/30/2022198,100 shares $82.15 million -30.3%0.9%0.8 $414.71
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11/15/2022284,100 shares $119.64 million +12.7%1.3%1.2 $421.11
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10/15/2022248,800 shares $98.20 million -17.7%1.2%1.4 $394.71
9/30/2022302,400 shares $126.14 million -20.1%1.4%1.9 $417.14
9/15/2022378,400 shares $178.89 million +2.9%1.8%2.6 $472.75
8/31/2022367,600 shares $178.30 million +24.0%1.7%2.5 $485.04
8/15/2022296,500 shares $162.04 million -11.6%1.4%1.8 $546.52
7/31/2022335,400 shares $188.92 million -0.8%1.6%1.8 $563.26
7/15/2022338,100 shares $167.03 million -13.0%1.6%1.7 $494.04
6/30/2022388,600 shares $192.36 million -6.3%1.8%1.8 $495.00
6/15/2022414,700 shares $199.24 million -26.4%2.0%1.9 $480.44
5/31/2022563,300 shares $302.94 million +38.1%2.6%2.6 $537.79
5/15/2022408,000 shares $204.86 million +22.6%1.9%1.8 $502.11
4/30/2022332,800 shares $170.41 million +0.8%1.6%1.4 $512.06
4/15/2022330,200 shares $181.01 million +3.5%1.6%1.4 $548.19
3/31/2022319,100 shares $179.73 million +7.2%1.5%1.4 $563.23
3/15/2022297,700 shares $163.36 million -5.1%1.4%1.4 $548.74
2/28/2022313,600 shares $196.30 million +3.0%1.5%1.5 $625.96
2/15/2022304,500 shares $188.09 million +10.1%1.4%1.6 $617.69
1/31/2022276,600 shares $165.89 million -8.0%1.3%1.8 $599.73
1/15/2022300,700 shares $188.91 million -0.2%1.4%2.3 $628.23
12/31/2021301,400 shares $227.73 million -7.3%1.4%2.7 $755.57
12/15/2021325,100 shares $241.99 million -13.7%1.5%2.9 $744.35
11/30/2021376,600 shares $283.66 million -5.5%1.8%3.3 $753.20
11/15/2021398,400 shares $300.33 million -1.7%1.9%3.4 $753.84
10/29/2021405,100 shares $321.92 million -6.1%1.9%3.4 $794.68
10/15/2021431,600 shares $311.39 million -8.0%2.0%3.6 $721.48
9/30/2021469,200 shares $350.00 million -6.1%2.2%3.9 $745.95
9/15/2021499,600 shares $394.72 million -6.3%2.4%4.1 $790.08
8/31/2021533,000 shares $428.97 million -20.3%2.5%4.7 $804.82

BIO Short Interest - Frequently Asked Questions

Short interest is the volume of Bio-Rad Laboratories shares that have been sold short but have not yet been covered or closed out. As of August 14th, investors have sold 1,327,739 shares of BIO short. 7.13% of Bio-Rad Laboratories' shares are currently sold short. Learn More on Bio-Rad Laboratories' 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. BIO shares currently have a short interest ratio of 4.8. Learn More on Bio-Rad Laboratories'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. 7.13% of Bio-Rad Laboratories' floating shares are currently sold short.

Bio-Rad Laboratories saw a decrease in short interest in the month of August. As of August 14th, there was short interest totaling 1,327,739 shares, a decrease of 6.0% from the previous total of 1,412,268 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.

7.13% of Bio-Rad Laboratories' shares are currently sold short. Here is how the short interest of companies in the sector of "healthcare" compare to Bio-Rad Laboratories: Repligen Corporation (10.85%), Bio-Techne Corp (4.18%), Agilent Technologies, Inc. (1.83%), AMN Healthcare Services Inc (8.26%), Danaher Corporation (1.40%), Mettler-Toledo International, Inc. (3.62%), Revvity Inc. (5.80%), Thermo Fisher Scientific Inc. (1.29%), West Pharmaceutical Services, Inc. (3.04%), Illumina, Inc. (6.46%),

As of the most recent reporting period, the following stocks had the largest short interest positions: SPDR S&P 500 ETF Trust ($71.57 billion), Invesco QQQ ($46.97 billion), iShares Russell 2000 ETF ($24.02 billion), Nebius Group N.V. ($15.37 billion), Sandisk Corporation ($12.60 billion), SPDR S&P Biotech ETF ($12.14 billion), Western Digital Corporation ($10.32 billion), iShares 20+ Year Treasury Bond ETF ($8.38 billion), VanEck Semiconductor ETF ($7.62 billion), and iShares iBoxx $ High Yield Corporate Bond ETF ($7.07 billion). View all of the most shorted stocks.

Short selling BIO is an investing strategy that aims to generate trading profit from Bio-Rad Laboratories as its price is falling. BIO shares are trading up $8.34 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 Bio-Rad Laboratories occurs when it has a large amount of short interest and its stock increases in price. This forces short sellers to cover their short interest positions by buying actual shares of BIO, 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 BIO, twice per month. The most recent reporting period available is August, 14 2026.

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

  • 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:BIO is sourced from the Financial Industry Regulatory Authority (FINRA), with the most recent report published on 8/25/2026. FINRA publishes updated short interest twice a month.
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