Quantum-Si (QSI) Short Interest Ratio & Short Volume $1.22 +0.05 (+4.27%) As of 04:00 PM Eastern Add Compare Share Share Short Interest Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock Quantum-Si Short Interest DataQuantum-Si (QSI) has a short interest of 20.57 million shares, representing 15.35% of the float (the number of shares available for trading by the public). This marks a 23.62% increase in short interest from the previous month. The short interest ratio (days to cover) is 1.6, indicating that it would take 1.6 days of the average trading volume of 9.73 million shares to cover all short positions.Current Short Interest20,570,000 sharesPrevious Short Interest16,640,000 sharesChange Vs. Previous Month+23.62%Dollar Volume Sold Short$24.68 millionShort Interest Ratio1.6 Days to CoverLast Record DateMarch 31, 2025Outstanding Shares183,140,000 sharesFloat Size134,010,000 sharesShort Percent of Float15.35%Today's Trading Volume2,798,685 sharesAverage Trading Volume9,730,345 sharesToday's Volume Vs. Average29% Short Selling Quantum-Si? Sign up to receive the latest short interest report for Quantum-Si and its competitors with MarketBeat's FREE newsletter. Email Address Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartQSI Short Interest Over TimeQSI Days to Cover Over TimeQSI Percentage of Float Shorted Over Time Quantum-Si Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 3/31/202520,570,000 shares $24.68 million +23.6%15.4%1.6 $1.20 3/15/202516,640,000 shares $22.63 million -5.8%12.4%0.7 $1.36 2/28/202517,660,000 shares $24.37 million -6.1%12.8%0.7 $1.38 2/15/202518,800,000 shares $36.66 million +0.4%13.8%0.6 $1.95 1/31/202518,730,000 shares $37.09 million +0.8%14.6%0.6 $1.98 1/15/202518,590,000 shares $43.69 million -21.4%14.5%0.6 $2.35 12/31/202423,650,000 shares $63.86 million +109.9%21.5%0.9 $2.70 12/15/202411,270,000 shares $19.38 million +24.0%11.6%1 $1.72 11/30/20249,090,000 shares $11.36 million +76.9%9.3%1.1 $1.25 11/15/20245,140,000 shares $3.77 million -12.9%5.3%0.8 $0.73 Get the Latest News and Ratings for QSI and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Quantum-Si and its competitors with MarketBeat's FREE daily newsletter. 10/31/20245,900,000 shares $4.14 million -0.2%6.1%12 $0.70 10/15/20245,910,000 shares $4.98 million -3.1%6.1%12.1 $0.84 9/30/20246,100,000 shares $5.38 million +4.3%6.3%11.7 $0.88 9/15/20245,850,000 shares $5.40 million -2.3%6.1%7.3 $0.92 8/31/20245,990,000 shares $5.67 million +2.4%6.2%7.5 $0.95 8/15/20245,850,000 shares $5.97 million -6.6%6.1%7.1 $1.02 7/31/20246,260,000 shares $6.82 million -2.2%6.5%7.7 $1.09 7/15/20246,400,000 shares $6.91 million -7.4%6.6%8 $1.08 6/30/20246,910,000 shares $7.26 million -6.5%7.2%8.8 $1.05 6/15/20247,390,000 shares $10.12 million No Change7.7%10.7 $1.37 5/31/20247,390,000 shares $11.23 million +5.3%7.7%12.2 $1.52 5/15/20247,020,000 shares $13.06 million -8.8%7.3%9.6 $1.86 4/30/20247,700,000 shares $12.40 million +4.1%8.0%10.2 $1.61 4/15/20247,400,000 shares $12.28 million -1.9%7.6%9.8 $1.66 3/31/20247,540,000 shares $14.85 million +2.5%7.7%10 $1.97 3/15/20247,360,000 shares $12.73 million -5.9%7.5%9.3 $1.73 2/29/20247,820,000 shares $13.06 million -5.2%7.9%10.3 $1.67 2/15/20248,250,000 shares $14.85 million +5.6%8.3%12.9 $1.80 1/31/20247,810,000 shares $12.18 million -18.3%7.8%11.5 $1.56 1/15/20249,560,000 shares $16.54 million +7.2%9.6%13.7 $1.73 12/31/20238,920,000 shares $17.93 million +10.4%9.0%12.5 $2.01 12/15/20238,080,000 shares $13.74 million -18.5%8.1%11.6 $1.70 11/30/20239,910,000 shares $15.96 million +8.0%10.0%13.8 $1.61 11/15/20239,180,000 shares $15.24 million +2.1%9.3%11.3 $1.66 10/31/20238,990,000 shares $10.79 million -5.2%9.2%8.6 $1.20 10/15/20239,480,000 shares $12.70 million -1.6%9.7%6 $1.34 9/30/20239,630,000 shares $15.99 million -6.1%9.8%4.6 $1.66 9/15/202310,260,000 shares $22.98 million +23.0%10.5%4.8 $2.24 8/31/20238,340,000 shares $19.52 million -1.2%8.5%3.8 $2.34 8/15/20238,440,000 shares $17.64 million +53.7%8.6%4.1 $2.09Trump’s Bitcoin Reserve is No Accident… (Ad)Bryce Paul believes this is the #1 coin to buy right now The catalyst behind this surge is a massive new blockchain development…Just click here to get all the details on this crypto coin now 7/31/20235,490,000 shares $21.36 million +34.6%5.7%3 $3.89 7/15/20234,080,000 shares $9.87 million +13.0%4.2%3.4 $2.42 6/30/20233,610,000 shares $6.46 million +11.4%3.8%5.5 $1.79 6/15/20233,240,000 shares $5.18 million -1.2%3.4%5.2 $1.60 5/31/20233,280,000 shares $4.95 million -2.1%3.4%5.9 $1.51 5/15/20233,350,000 shares $4.76 million -1.2%3.5%5.3 $1.42 4/30/20233,390,000 shares $4.98 million +1.2%3.6%5.4 $1.47 4/15/20233,350,000 shares $5.09 million -3.5%3.5%5 $1.52 3/31/20233,470,000 shares $6.11 million +4.5%3.7%4.9 $1.76 3/15/20233,320,000 shares $5.88 million +6.1%3.5%4.6 $1.77 2/28/20233,130,000 shares $5.70 million +9.1%3.3%4.4 $1.82 2/15/20232,870,000 shares $6.20 million -6.5%3.0%4 $2.16 1/31/20233,070,000 shares $6.82 million -12.3%3.2%4.2 $2.22 1/15/20233,500,000 shares $7.74 million -5.4%3.7%4.7 $2.21 12/30/20223,700,000 shares $6.77 million +1.9%3.9%5.1 $1.83 12/15/20223,630,000 shares $7.80 million -14.8%3.8%5.3 $2.15 11/30/20224,260,000 shares $10.14 million -0.2%4.6%6.9 $2.38 11/15/20224,270,000 shares $13.37 million +6.0%4.6%8.1 $3.13 10/31/20224,030,000 shares $12.21 million -4.1%4.4%8.1 $3.03 10/15/20224,200,000 shares $11.00 million +1.0%4.6%8.7 $2.62 9/30/20224,160,000 shares $11.44 million -4.4%4.5%8.4 $2.75 9/15/20224,350,000 shares $13.35 million -0.7%4.7%5.3 $3.07 8/31/20224,380,000 shares $13.67 million -5.4%4.8%4.5 $3.12 8/15/20224,630,000 shares $20.14 million +1.3%5.2%4.5 $4.35 7/31/20224,570,000 shares $14.85 million -16.8%5.2%4.1 $3.25 7/15/20225,490,000 shares $15.87 million -3.4%6.3%4.9 $2.89 6/30/20225,680,000 shares $13.18 million +9.2%6.5%5 $2.32 6/15/20225,200,000 shares $17.47 million -10.0%6.3%4.9 $3.36 5/31/20225,780,000 shares $24.57 million -2.9%7.0%7 $4.25 5/15/20225,950,000 shares $21.42 million +9.2%7.2%6.6 $3.60 4/30/20225,450,000 shares $23.87 million -2.5%6.6%5.5 $4.38 4/15/20225,590,000 shares $23.65 million -5.3%6.7%5.2 $4.23 3/31/20225,900,000 shares $27.61 million +3.0%7.2%5.2 $4.68 3/15/20225,730,000 shares $22.12 million -6.4%7.0%4.4 $3.86 2/28/20226,120,000 shares $25.46 million +20.7%7.4%5.1 $4.16 2/15/20225,070,000 shares $20.58 million -14.7%6.2%4.2 $4.06 1/31/20225,940,000 shares $28.45 million +6.5%7.1%5.4 $4.79 1/15/20225,580,000 shares $32.59 million +11.8%6.7%5.5 $5.84 12/31/20214,990,000 shares $39.27 million -7.8%6.0%5.6 $7.87 12/15/20215,410,000 shares $33.76 million +6.3%6.5%6.3 $6.24 11/30/20215,090,000 shares $32.98 million +2.4%6.2%6.5 $6.48 11/15/20214,970,000 shares $39.21 million -2.4%6.0%6.6 $7.89 10/29/20215,090,000 shares $41.03 million -3.6%6.2%6.1 $8.06 10/15/20215,280,000 shares $45.41 million +8.0%6.4%4.9 $8.60 9/30/20214,890,000 shares $40.78 million +34.3%6.0%4.1 $8.34 9/15/20213,640,000 shares $33.12 million -5.2%4.4%2.8 $9.10 8/31/20213,840,000 shares $37.32 million +16.7%4.7%2.8 $9.72 8/13/20213,290,000 shares $26.22 million No Change4.0%2.6 $7.97 QSI Short Interest - Frequently Asked Questions What is Quantum-Si's current short interest? Short interest is the volume of Quantum-Si shares that have been sold short but have not yet been covered or closed out. As of March 31st, traders have sold 20,570,000 shares of QSI short. 15.35% of Quantum-Si's shares are currently sold short. Learn More on Quantum-Si's current short interest. What is a good short interest ratio for Quantum-Si? 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. QSI shares currently have a short interest ratio of 2.0. Learn More on Quantum-Si's short interest ratio. Which institutional investors are shorting Quantum-Si? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Quantum-Si: Wolverine Trading LLC, Group One Trading LLC, Citadel Advisors LLC, Jane Street Group LLC, Susquehanna International Group LLP, Simplex Trading LLC, and Belvedere Trading LLC. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. What is a good short interest percentage for Quantum-Si? 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. 15.35% of Quantum-Si's floating shares are currently sold short. Is Quantum-Si's short interest increasing or decreasing? Quantum-Si saw a increase in short interest in the month of March. As of March 31st, there was short interest totaling 20,570,000 shares, an increase of 23.6% from the previous total of 16,640,000 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. What is Quantum-Si's float size? Quantum-Si currently has issued a total of 183,140,000 shares. Some of Quantum-Si's 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. Quantum-Si currently has a public float of 134,010,000 shares. How does Quantum-Si's short interest compare to its competitors? 15.35% of Quantum-Si's shares are currently sold short. Here is how the short interest of companies in the industry of "measuring and control equipment" compare to Quantum-Si: Transcat, Inc. (5.51%), Cytek Biosciences, Inc. (3.90%), Standard BioTools Inc. (4.84%), EyePoint Pharmaceuticals, Inc. (16.81%), Allient Inc. (1.27%), Aehr Test Systems (23.39%), Quanterix Co. (7.72%), 908 Devices Inc. (9.95%), Frequency Electronics, Inc. (0.20%), Seer, Inc. (5.55%), 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 ($21.93 billion), iShares 20+ Year Treasury Bond ETF ($9.31 billion), Strategy Incorporated ($8.42 billion), Charter Communications, Inc. ($4.52 billion), Apollo Global Management, Inc. ($4.26 billion), Super Micro Computer, Inc. ($3.98 billion), Capital One Financial Co. ($3.79 billion), TC Energy Co. ($3.43 billion), AppLovin Co. ($2.91 billion), and Schlumberger Limited ($2.89 billion). View all of the most shorted stocks. What does it mean to sell short Quantum-Si stock? Short selling QSI is an investing strategy that aims to generate trading profit from Quantum-Si as its price is falling. QSI shares are trading up $0.05 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 Quantum-Si? A short squeeze for Quantum-Si 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 QSI, which in turn drives the price of the stock up even further. How often is Quantum-Si'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 QSI, twice per month. The most recent reporting period available is March, 31 2025. More Short Interest Resources from MarketBeat Related Companies Transcat Short Squeeze Cytek Biosciences Short Squeeze Standard BioTools Short Squeeze EyePoint Pharmaceuticals Short Squeeze Allient Short Squeeze Aehr Test Systems Short Squeeze Quanterix Short Squeeze 908 Devices Short Squeeze Frequency Electronics Short Squeeze Seer 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:QSI) was last updated on 4/24/2025 by MarketBeat.com Staff From Our PartnersTrump’s Bitcoin Reserve is No Accident…Bryce Paul believes this is the #1 coin to buy right now The catalyst behind this surge is a massive new b...Crypto 101 Media | SponsoredJames Altucher: Do not invest in AI unless…I made millions during the crypto boom. 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