Bio-Rad Laboratories (BIO) Short Interest Ratio & Short Volume $275.85 -6.22 (-2.21%) As of 03:59 PM Eastern Add Compare Share Share Short Interest Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Bio-Rad Laboratories Short Interest DataBio-Rad Laboratories (BIO) has a short interest of 1.00 million shares, representing 5.46% of the float (the number of shares available for trading by the public). This marks a 0.00% change in short interest from the previous month. The short interest ratio (days to cover) is 3.1, indicating that it would take 3.1 days of the average trading volume of 317,464 shares to cover all short positions.Current Short Interest1,000,000 sharesPrevious Short Interest1,000,000 sharesChange Vs. Previous MonthNo ChangeDollar Volume Sold Short$298.39 millionShort Interest Ratio3.1 Days to CoverLast Record DateAugust 31, 2025Outstanding Shares27,062,000 sharesFloat Size18,320,000 sharesShort Percent of Float5.46%Today's Trading Volume210,086 sharesAverage Trading Volume317,464 sharesToday's Volume Vs. Average66% Short Selling Bio-Rad Laboratories? Sign up to receive the latest short interest report for Bio-Rad Laboratories and its competitors with MarketBeat's FREE newsletter. Email Address Get Report View SMS TermsBy entering your phone number and clicking the sign-up button, you agree to receive periodic text messages from MarketBeat at the phone number you submitted, including texts that may be sent using an automatic telephone dialing system. Message and data rates may apply. Message frequency will vary. Messages will consist of stock alerts, news stories, and partner advertisements/offers. Consent is not a condition of the purchase of any goods or services. 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Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartBIO Short Interest Over TimeBIO Days to Cover Over TimeBIO Percentage of Float Shorted Over Time Bio-Rad Laboratories Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 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 Get the Latest News and Ratings for BIO and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Bio-Rad Laboratories and its competitors with MarketBeat's FREE daily newsletter. 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 12/15/2024551,600 shares $185.49 million +12.9%2.9%2.8 $336.28 11/30/2024488,600 shares $166.38 million -6.8%2.6%1.7 $340.53 11/15/2024524,400 shares $167.97 million -19.5%2.7%1.8 $320.31 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 11/15/2022284,100 shares $119.64 million +12.7%1.3%1.2 $421.11 10/31/2022252,000 shares $88.63 million +1.3%1.2%1.2 $351.71 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 8/13/2021668,400 shares $520.22 million +3.6%3.2%5.6 $778.30 7/30/2021645,100 shares $477.06 million +7.0%3.1%5.3 $739.51 7/15/2021602,800 shares $401.93 million +9.5%2.8%4.8 $666.77 6/30/2021550,400 shares $354.62 million -0.2%2.6%4.2 $644.29 6/15/2021551,200 shares $335.83 million -0.1%2.6%4.2 $609.27 5/28/2021551,800 shares $332.39 million +5.8%2.6%3.8 $602.37 5/14/2021521,400 shares $308.13 million -8.8%2.5%3.4 $590.97 4/30/2021571,900 shares $366.43 million -3.6%2.7%3.1 $640.73 4/15/2021593,000 shares $362.98 million +10.0%2.8%3.1 $612.11 3/31/2021539,100 shares $304.13 million -2.9%2.5%2.5 $564.15 3/15/2021555,000 shares $310.79 million -19.0%2.6%2.4 $559.98 2/26/2021685,300 shares $399.15 million +11.0%3.2%2.9 $582.45 2/12/2021617,400 shares $397.49 million +11.9%2.9%2.4 $643.81 1/29/2021551,800 shares $312.56 million -10.5%2.6%2.3 $566.44 1/15/2021616,200 shares $365.49 million -3.4%2.9%2.7 $593.14 12/31/2020637,700 shares $366.57 million +21.7%3.0%3 $574.83 12/15/2020523,800 shares $303.62 million -2.0%2.5%2.5 $579.65 11/30/2020534,400 shares $285.94 million +37.9%2.5%2.7 $535.07 11/15/2020387,600 shares $233.47 million -6.3%1.8%2.3 $602.36 10/30/2020413,700 shares $234.99 million -8.0%2.0%2.5 $568.03 10/15/2020449,600 shares $250.60 million +24.9%2.1%2.9 $557.39 9/30/2020360,000 shares $185.57 million -31.1%1.7%2.1 $515.46 BIO Short Interest - Frequently Asked Questions What is Bio-Rad Laboratories' current short interest? Short interest is the volume of Bio-Rad Laboratories shares that have been sold short but have not yet been closed out or covered. As of August 31st, investors have sold 1,000,000 shares of BIO short. 5.46% of Bio-Rad Laboratories' shares are currently sold short. Learn More on Bio-Rad Laboratories' current short interest. What is a good short interest ratio for Bio-Rad Laboratories? 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 3.0. Learn More on Bio-Rad Laboratories's short interest ratio. Which institutional investors are shorting Bio-Rad Laboratories? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Bio-Rad Laboratories: Group One Trading LLC, Jane Street Group LLC, and Simplex Trading LLC. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. What is a good short interest percentage for Bio-Rad Laboratories? 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. 5.46% of Bio-Rad Laboratories' floating shares are currently sold short. What is Bio-Rad Laboratories' float size? Bio-Rad Laboratories currently has issued a total of 27,062,000 shares. Some of Bio-Rad Laboratories' outstanding shares are available for trading, while others are subject to various restrictions. The public float, also referred to as floating shares or "the float", are shares that publicly owned, unrestricted and available to trade on the open market. Bio-Rad Laboratories currently has a public float of 18,320,000 shares. How does Bio-Rad Laboratories' short interest compare to its competitors? 5.46% of Bio-Rad Laboratories' shares are currently sold short. Here is how the short interest of companies compare to Bio-Rad Laboratories: Mettler-Toledo International, Inc. (3.32%), Waters Corporation (3.94%), Illumina, Inc. (4.82%), Bio-Techne Corp (3.40%), Charles River Laboratories International, Inc. (5.49%), Bruker Corporation (8.11%), Pacific Biosciences of California, Inc. (12.67%), Harvard Bioscience, Inc. (2.00%), Thermo Fisher Scientific Inc. (1.05%), Agilent Technologies, Inc. (1.08%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: SPDR S&P 500 ETF Trust ($73.23 billion), Invesco QQQ ($29.52 billion), iShares Russell 2000 ETF ($20.82 billion), iShares 20+ Year Treasury Bond ETF ($10.76 billion), Palo Alto Networks, Inc. ($9.37 billion), Strategy Inc ($7.58 billion), Invesco S&P 500 Equal Weight ETF ($6.78 billion), SPDR S&P Biotech ETF ($6.72 billion), AppLovin Corporation ($6.37 billion), and iShares iBoxx $ Investment Grade Corporate Bond ETF ($6.29 billion). View all of the most shorted stocks. What does it mean to sell short Bio-Rad Laboratories stock? 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 down $3.71 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. How does a short squeeze work against Bio-Rad Laboratories? 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. How often is Bio-Rad Laboratories' short interest reported? 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, 31 2025. More Short Interest Resources from MarketBeat Related Companies MTD Short Interest Data WAT Short Interest Data ILMN Short Interest Data TECH Short Interest Data CRL Short Interest Data BRKR Short Interest Data PACB Short Interest Data HBIO Short Interest Data TMO Short Interest Data A Short Interest Data Short Interest Tools Stocks to Short Largest Short Interest Positions Short Interest Increases Short Interest Decreases Short Interest Reporting Dates This page (NYSE:BIO) was last updated on 9/24/2025 by MarketBeat.com Staff From Our PartnersWhat The Silver Boom Could Mean For You…AI, electric vehicles, and even global central banks are quietly fueling record demand for silver. 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