Pacific Biosciences of California (PACB) Short Interest Ratio & Short Volume $1.30 -0.03 (-1.88%) As of 12:13 PM Eastern This is a fair market value price provided by Polygon.io. Learn more. Add Compare Share Share Short Interest Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock Pacific Biosciences of California Short Interest DataPacific Biosciences of California (PACB) has a short interest of 61.98 million shares, representing 23.19% of the float (the number of shares available for trading by the public). This marks a -7.06% decrease in short interest from the previous month. The short interest ratio (days to cover) is 5.5, indicating that it would take 5.5 days of the average trading volume of 11.45 million shares to cover all short positions.Current Short Interest61,980,000 sharesPrevious Short Interest66,690,000 sharesChange Vs. Previous Month-7.06%Dollar Volume Sold Short$89.87 millionShort Interest Ratio5.5 Days to CoverLast Record DateFebruary 28, 2025Outstanding Shares297,852,000 sharesShort Percent of Float23.19%Today's Trading Volume1,557,314 sharesAverage Trading Volume11,447,217 sharesToday's Volume Vs. Average14% Short Selling Pacific Biosciences of California? Sign up to receive the latest short interest report for Pacific Biosciences of California and its competitors with MarketBeat's FREE newsletter. Email Address Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartPACB Short Interest Over TimePACB Days to Cover Over TimePACB Percentage of Float Shorted Over Time Remove Ads Pacific Biosciences of California Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 2/28/202561,980,000 shares $89.87 million -7.1%23.2%5.5 $1.45 2/15/202566,690,000 shares $123.38 million +10.4%25.0%6.1 $1.85 1/31/202560,400,000 shares $93.02 million -0.2%N/A5.7 $1.54 1/15/202560,540,000 shares $105.64 million +6.5%N/A6 $1.75 12/31/202456,850,000 shares $104.04 million +7.1%N/A5.8 $1.83 12/15/202453,060,000 shares $104.00 million -2.4%N/A5.7 $1.96 11/30/202454,380,000 shares $103.87 million +4.3%N/A5.6 $1.91 11/15/202452,140,000 shares $83.16 million +3.4%N/A5.5 $1.60 10/31/202450,410,000 shares $109.39 million +3.9%N/A5.8 $2.17 10/15/202448,540,000 shares $101.93 million -6.0%N/A5.9 $2.10 Get the Latest News and Ratings for PACB and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Pacific Biosciences of California and its competitors with MarketBeat's FREE daily newsletter. 9/30/202451,640,000 shares $87.79 million +11.0%N/A5.7 $1.70 9/15/202446,530,000 shares $84.22 million -23.8%N/A4.9 $1.81 8/31/202461,030,000 shares $83.61 million +1.8%N/A6.8 $1.37 8/15/202459,960,000 shares $101.33 million +5.0%N/A6.8 $1.69 7/31/202457,100,000 shares $117.63 million -7.4%N/A5.9 $2.06 7/15/202461,680,000 shares $99.92 million +9.2%N/A6.2 $1.62 6/30/202456,470,000 shares $77.36 million +3.5%N/A5.3 $1.37 6/15/202454,570,000 shares $96.04 million +0.6%N/A5.3 $1.76 5/31/202454,250,000 shares $97.11 million -4.1%N/A5.2 $1.79 5/15/202456,580,000 shares $121.36 million +7.1%N/A5.2 $2.15 4/30/202452,820,000 shares $87.15 million +8.9%N/A5.1 $1.65 4/15/202448,520,000 shares $137.55 million -1.1%N/A5 $2.84 3/31/202449,050,000 shares $183.94 million +7.6%N/A5.6 $3.75 3/15/202445,570,000 shares $172.71 million +4.7%N/A5.4 $3.79 2/29/202443,540,000 shares $240.78 million +7.8%N/A5.3 $5.53 2/15/202440,380,000 shares $269.33 million +18.1%N/A5.4 $6.67 1/31/202434,190,000 shares $222.58 million -5.0%N/A5.1 $6.51 1/15/202436,000,000 shares $241.56 million -4.7%N/A5.6 $6.71 12/31/202337,780,000 shares $370.62 million +8.3%N/A6.7 $9.81 12/15/202334,890,000 shares $329.36 million +4.4%N/A6.7 $9.44 11/30/202333,430,000 shares $283.49 million -14.8%N/A7 $8.48 11/15/202339,230,000 shares $306.39 million +11.7%N/A8.5 $7.81 10/31/202335,120,000 shares $217.04 million -6.9%N/A8.1 $6.18 10/15/202337,740,000 shares $301.17 million +14.1%N/A9.6 $7.98 9/30/202333,070,000 shares $276.13 million -2.2%N/A8.6 $8.35 9/15/202333,820,000 shares $352.40 million +2.3%N/A9.4 $10.42 8/31/202333,060,000 shares $372.92 million +5.3%N/A9.3 $11.28 8/15/202331,390,000 shares $352.20 million +10.6%N/A8.3 $11.22 7/31/202328,390,000 shares $375.03 million -7.6%N/A7.7 $13.21 7/15/202330,710,000 shares $421.96 million -2.7%N/A8.6 $13.74Most gold “analysts” aren’t really gold analysts… [watch out] (Ad)People who don’t understand the gold market are about to lose a lot of money. 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Go here to learn about my Top Four picks for the coming bull mania. 6/30/202331,550,000 shares $419.62 million +25.3%N/A8.8 $13.30 6/15/202325,190,000 shares $335.28 million -1.0%N/A6.7 $13.31 5/31/202325,440,000 shares $314.95 million +5.2%N/A6.7 $12.38 5/15/202324,180,000 shares $300.80 million -5.0%N/A6.6 $12.44 4/30/202325,440,000 shares $269.66 million -6.4%N/A6.7 $10.60 4/15/202327,180,000 shares $304.42 million +8.3%N/A6.6 $11.20 3/31/202325,100,000 shares $290.66 million -4.5%N/A5.8 $11.58 3/15/202326,280,000 shares $238.10 million +14.2%N/A6.2 $9.06 2/28/202323,020,000 shares $209.02 million +8.4%N/A5.6 $9.08 2/15/202321,240,000 shares $235.55 million -5.6%N/A5.3 $11.09 1/31/202322,490,000 shares $249.41 million -7.1%N/A5 $11.09 1/15/202324,200,000 shares $265.23 million -1.9%N/A4.9 $10.96 12/30/202224,670,000 shares $201.80 million +8.1%N/A5.1 $8.18 12/15/202222,820,000 shares $206.75 million +3.8%N/A4.4 $9.06 11/30/202221,990,000 shares $236.39 million -9.1%N/A3.9 $10.75 11/15/202224,190,000 shares $270.93 million +4.1%N/A4 $11.20 10/31/202223,240,000 shares $196.15 million -3.0%N/A3 $8.44 10/15/202223,950,000 shares $146.10 million -5.3%N/A3.1 $6.10 9/30/202225,290,000 shares $146.81 million -16.6%N/A3.3 $5.81 9/15/202230,310,000 shares $200.35 million +4.8%N/A3.8 $6.61 8/31/202228,930,000 shares $169.53 million -11.6%N/A3.6 $5.86 8/15/202232,720,000 shares $273.54 million -7.5%N/A3.9 $8.36 7/31/202235,360,000 shares $154.52 million -1.9%N/A5.1 $4.37 7/15/202236,030,000 shares $152.77 million -12.2%N/A5.1 $4.24 6/30/202241,020,000 shares $181.31 million +7.9%N/A5.7 $4.42 6/15/202238,010,000 shares $162.68 million +10.6%N/A5.3 $4.28 5/31/202234,370,000 shares $193.50 million +3.0%N/A5 $5.63 5/15/202233,370,000 shares $194.88 million +1.2%N/A5.2 $5.84 4/30/202232,960,000 shares $208.97 million +8.8%N/A5.5 $6.34 4/15/202230,290,000 shares $228.39 million -2.8%N/A5.2 $7.54 3/31/202231,170,000 shares $283.65 million +1.3%N/A5.6 $9.10 3/15/202230,760,000 shares $281.76 million +3.5%N/A6.3 $9.16 2/28/202229,710,000 shares $354.14 million +8.5%N/A6.6 $11.92 2/15/202227,390,000 shares $311.70 million +3.1%N/A6.3 $11.38 1/31/202226,580,000 shares $297.16 million +22.9%N/A7.1 $11.18 1/15/202221,630,000 shares $268.86 million +8.6%N/A6.9 $12.43 12/31/202119,910,000 shares $407.36 million -1.6%N/A7.8 $20.46 12/15/202120,230,000 shares $444.86 million +19.2%N/A9 $21.99 11/30/202116,970,000 shares $393.87 million -5.1%N/A8.5 $23.21 11/15/202117,890,000 shares $477.66 million +0.9%N/A9.6 $26.70 10/29/202117,730,000 shares $469.49 million +14.2%9.3%9.9 $26.48 10/15/202115,520,000 shares $378.53 million +9.3%8.2%8.5 $24.39 9/30/202114,200,000 shares $362.81 million +9.3%7.5%7.4 $25.55 9/15/202112,990,000 shares $359.04 million +2.4%6.8%6.6 $27.64 8/31/202112,690,000 shares $397.32 million +8.8%6.7%6.4 $31.31 8/13/202111,660,000 shares $343.62 million -2.1%6.1%5.7 $29.47 7/30/202111,910,000 shares $382.91 million -2.6%6.3%5.2 $32.15 7/15/202112,230,000 shares $330.21 million -10.5%6.5%5 $27.00 6/30/202113,660,000 shares $477.69 million -0.8%7.2%5.5 $34.97 6/15/202113,770,000 shares $385.84 million +0.8%7.3%5.2 $28.02Most gold “analysts” aren’t really gold analysts… [watch out] (Ad)People who don’t understand the gold market are about to lose a lot of money. Unfortunately, most so-called “gold analysts” have it all wrong… They tell you to invest in gold ETFs - because the popular mining ETFs will someday catch fire and close the price gap with spot gold. Go here to learn about my Top Four picks for the coming bull mania. 5/28/202113,660,000 shares $369.50 million -2.6%7.2%4.7 $27.05 5/14/202114,030,000 shares $312.87 million +3.1%N/A3.9 $22.30 4/30/202113,610,000 shares $455.66 million +15.9%N/A3.2 $33.48 4/15/202111,740,000 shares $382.14 million -8.9%N/A2.8 $32.55 3/31/202112,890,000 shares $386.06 million +12.4%N/A2.7 $29.95 3/15/202111,470,000 shares $388.72 million +28.9%N/A2.1 $33.89 2/26/20218,900,000 shares $277.46 million -8.3%N/A1.6 $31.18 2/12/20219,710,000 shares $496.67 million -25.3%N/A1.9 $51.15 1/29/202113,000,000 shares $445.64 million -1.2%N/A2.7 $34.28 1/15/202113,160,000 shares $496.40 million -15.7%N/A2.7 $37.72 12/31/202015,610,000 shares $411.32 million +30.7%N/A3.2 $26.35 12/15/202011,940,000 shares $249.55 million -12.8%N/A2.6 $20.90 11/30/202013,690,000 shares $211.24 million -5.1%N/A3.1 $15.43 11/15/202014,430,000 shares $241.56 million -3.7%N/A3.4 $16.74 10/30/202014,990,000 shares $200.27 million -14.0%N/A3.5 $13.36 10/15/202017,420,000 shares $243.18 million +0.2%N/A4.5 $13.96 9/30/202017,380,000 shares $171.54 million +0.9%N/A5.3 $9.87 9/15/202017,230,000 shares $126.12 million +3.8%N/A7 $7.32 8/31/202016,600,000 shares $109.56 million -4.8%N/A8.3 $6.60 8/14/202017,430,000 shares $100.22 million +0.1%12.3%9.9 $5.75 7/31/202017,410,000 shares $64.94 million -2.4%12.3%13.7 $3.73 7/15/202017,830,000 shares $74.35 million -0.1%12.6%14.2 $4.17 6/30/202017,850,000 shares $61.58 million +11.1%12.6%13.6 $3.45 6/15/202016,070,000 shares $59.46 million -1.2%11.4%11.2 $3.70 5/29/202016,270,000 shares $57.27 million -1.6%11.5%9.9 $3.52 5/15/202016,540,000 shares $57.56 million -7.6%11.7%8.5 $3.48 4/30/202017,890,000 shares $63.33 million -0.9%12.6%7.6 $3.54 4/15/202018,050,000 shares $50.54 million -1.6%13.0%7.9 $2.80 3/31/202018,350,000 shares $59.09 million -13.7%13.2%7.1 $3.22 PACB Short Interest - Frequently Asked Questions What is Pacific Biosciences of California's current short interest? Short interest is the volume of Pacific Biosciences of California shares that have been sold short but have not yet been closed out or covered. As of February 28th, traders have sold 61,980,000 shares of PACB short. 23.19% of Pacific Biosciences of California's shares are currently sold short. Learn More on Pacific Biosciences of California's current short interest. What is a good short interest ratio for Pacific Biosciences of California? 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. PACB shares currently have a short interest ratio of 6.0. Learn More on Pacific Biosciences of California's short interest ratio. Which institutional investors are shorting Pacific Biosciences of California? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Pacific Biosciences of California: GTS Securities LLC, Wolverine Trading LLC, Squarepoint Ops LLC, Group One Trading LLC, Citadel Advisors LLC, Jane Street Group LLC, Concourse Financial Group Securities Inc., Walleye Trading 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 Pacific Biosciences of California? 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. 23.19% of Pacific Biosciences of California's floating shares are currently sold short. Is Pacific Biosciences of California's short interest increasing or decreasing? Pacific Biosciences of California saw a decrease in short interest in February. As of February 28th, there was short interest totaling 61,980,000 shares, a decrease of 7.1% from the previous total of 66,690,000 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. How does Pacific Biosciences of California's short interest compare to its competitors? 23.19% of Pacific Biosciences of California's shares are currently sold short. Here is how the short interest of companies compare to Pacific Biosciences of California: Harvard Bioscience, Inc. (2.56%), Thermo Fisher Scientific Inc. (1.10%), Agilent Technologies, Inc. (1.21%), Mettler-Toledo International Inc. (1.69%), Waters Co. (2.73%), Illumina, Inc. (4.12%), Bio-Techne Co. (3.47%), Charles River Laboratories International, Inc. (5.81%), Bio-Rad Laboratories, Inc. (4.50%), Bruker Co. (5.54%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: Invesco QQQ ($23.74 billion), iShares 20+ Year Treasury Bond ETF ($10.75 billion), MicroStrategy Incorporated ($6.56 billion), Apollo Global Management, Inc. ($5.40 billion), Charter Communications, Inc. ($4.57 billion), AppLovin Co. ($4.45 billion), Capital One Financial Co. ($4.33 billion), Super Micro Computer, Inc. ($4.23 billion), Schlumberger Limited ($3.22 billion), and Royal Caribbean Cruises Ltd. ($3.06 billion). View all of the most shorted stocks. What does it mean to sell short Pacific Biosciences of California stock? Short selling PACB is an investing strategy that aims to generate trading profit from Pacific Biosciences of California as its price is falling. PACB shares are trading up $0.03 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 Pacific Biosciences of California? A short squeeze for Pacific Biosciences of California 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 PACB, which in turn drives the price of the stock up even further. How often is Pacific Biosciences of California's 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 PACB, twice per month. The most recent reporting period available is February, 28 2025. More Short Interest Resources from MarketBeat Related Companies Harvard Bioscience Short Squeeze Thermo Fisher Scientific Short Squeeze Agilent Technologies Short Squeeze Mettler-Toledo International Short Squeeze Waters Short Squeeze Illumina Short Squeeze Bio-Techne Short Squeeze Charles River Laboratories International Short Squeeze Bio-Rad Laboratories Short Squeeze Bruker Short Squeeze Short Interest Tools Stocks to Short Largest Short Interest Positions Short Interest Increases Short Interest Decreases Short Interest Reporting Dates This page (NASDAQ:PACB) was last updated on 3/25/2025 by MarketBeat.com Staff From Our PartnersA brutally honest economic warning for 2025 (see proof)New York Times best-selling financial author and world-renowned economist Addison Wiggin (a man who’s worked s...Banyan Hill Publishing | Sponsored$2 Trillion Disappears Because of Fed's Secretive New Move$2 trillion has disappeared from the US government's books. 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