Sutro Biopharma (STRO) Short Interest Ratio & Short Volume $0.75 -0.02 (-2.64%) Closing price 04:00 PM EasternExtended Trading$0.78 +0.03 (+4.53%) As of 04:42 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 Polygon.io. Learn more. Add Compare Share Share Short Interest Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Sutro Biopharma Short Interest DataSutro Biopharma (STRO) has a short interest of 4.46 million shares, representing 5.75% of the float (the number of shares available for trading by the public). This marks a 1.13% increase in short interest from the previous month. The short interest ratio (days to cover) is 4.2, indicating that it would take 4.2 days of the average trading volume of 972,712 shares to cover all short positions.Current Short Interest4,460,000 sharesPrevious Short Interest4,410,000 sharesChange Vs. Previous Month+1.13%Dollar Volume Sold Short$7.09 millionShort Interest Ratio4.2 Days to CoverLast Record DateFebruary 28, 2025Outstanding Shares82,459,000 sharesShort Percent of Float5.75%Today's Trading Volume1,043,324 sharesAverage Trading Volume972,712 sharesToday's Volume Vs. Average107% Short Selling Sutro Biopharma? Sign up to receive the latest short interest report for Sutro Biopharma and its competitors with MarketBeat's FREE newsletter. Email Address Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartSTRO Short Interest Over TimeSTRO Days to Cover Over TimeSTRO Percentage of Float Shorted Over Time Remove Ads Sutro Biopharma Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 2/28/20254,460,000 shares $7.09 million +1.1%5.7%4.2 $1.59 2/15/20254,410,000 shares $7.89 million +8.4%5.7%4.2 $1.79 1/31/20254,070,000 shares $7.81 million +5.7%N/A3.8 $1.92 1/15/20253,850,000 shares $7.05 million +22.2%N/A3.9 $1.83 12/31/20243,150,000 shares $5.80 million +28.1%N/A3.4 $1.84 12/15/20242,460,000 shares $5.22 million +19.4%N/A2.7 $2.12 11/30/20242,060,000 shares $5.46 million +15.1%N/A2.6 $2.65 11/15/20241,790,000 shares $5.17 million -25.4%N/A2.8 $2.89 10/31/20242,400,000 shares $7.80 million -16.1%N/A4 $3.25 10/15/20242,860,000 shares $10.95 million No ChangeN/A4.9 $3.83 Get the Latest News and Ratings for STRO and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Sutro Biopharma and its competitors with MarketBeat's FREE daily newsletter. 9/30/20242,860,000 shares $9.90 million -4.4%N/A4.4 $3.46 9/15/20242,990,000 shares $13.46 million -1.0%N/A4 $4.50 8/31/20243,020,000 shares $13.80 million -10.9%N/A4.1 $4.57 8/15/20243,390,000 shares $13.70 million +6.3%N/A4.5 $4.04 7/31/20243,190,000 shares $12.66 million -13.8%N/A3.9 $3.97 7/15/20243,700,000 shares $15.61 million +14.6%N/A4.5 $4.22 6/30/20243,230,000 shares $9.46 million +41.1%N/A3.8 $2.93 6/15/20242,290,000 shares $7.92 million +20.5%N/A2.3 $3.46 5/31/20241,900,000 shares $8.03 million -2.6%N/A1.9 $4.23 5/15/20241,950,000 shares $7.66 million No ChangeN/A1.9 $3.93 4/30/20241,950,000 shares $6.62 million -10.6%N/A2 $3.40 4/15/20242,180,000 shares $9.03 million -9.5%N/A2.2 $4.14 3/31/20242,410,000 shares $13.62 million +3.9%N/A2.3 $5.65 3/15/20242,320,000 shares $9.54 million -3.7%N/A2.6 $4.11 2/29/20242,410,000 shares $11.83 million -9.7%N/A2.9 $4.91 2/15/20242,670,000 shares $11.99 million +2.3%N/A3.2 $4.49 1/31/20242,610,000 shares $11.33 million +8.8%N/A2.9 $4.34 1/15/20242,400,000 shares $9.60 million +1.7%N/A2.7 $4.00 12/31/20232,360,000 shares $10.12 million +24.2%N/A2.6 $4.29 12/15/20231,900,000 shares $7.56 million -8.2%N/A2.4 $3.98 11/30/20232,070,000 shares $5.40 million -10.0%N/A3 $2.61 11/15/20232,300,000 shares $5.66 million -3.0%N/A3.7 $2.46 10/31/20232,370,000 shares $6.52 million -4.4%N/A5.3 $2.75 10/15/20232,480,000 shares $9.77 million +5.1%N/A6.2 $3.94 9/30/20232,360,000 shares $8.19 million -2.5%N/A6.3 $3.47 9/15/20232,420,000 shares $9.46 million +28.7%N/A7.9 $3.91 8/31/20231,880,000 shares $8.93 million -2.1%N/A4.5 $4.75 8/15/20231,920,000 shares $8.20 million -1.5%N/A4.5 $4.27 7/31/20231,950,000 shares $8.72 million -1.5%N/A4.3 $4.47 7/15/20231,980,000 shares $9.37 million +2.1%N/A4 $4.73While Markets Slide, These "Genesis Cog" Trades Are Up Double-Digits (Ad)While most investors are struggling in today's volatile market, a small group of traders are quietly booking consistent gains. Just last week, our Genesis Cog subscribers captured an 11.51% gain shorting JEF, another 8.57% on CAKE, and 4.78% on RJF—all while the broader indexes continued their downward trend.Click here to discover how the Genesis Cog works in falling markets 6/30/20231,940,000 shares $9.02 million -36.8%N/A3.8 $4.65 6/15/20233,070,000 shares $16.61 million +2.0%N/A5.6 $5.41 5/31/20233,010,000 shares $13.51 million -2.9%N/A6.2 $4.49 5/15/20233,100,000 shares $18.23 million +4.4%N/A6.6 $5.88 4/30/20232,970,000 shares $12.65 million -2.3%N/A6.5 $4.26 4/15/20233,040,000 shares $13.38 million +8.6%N/A7.1 $4.40 3/31/20232,800,000 shares $12.94 million +77.2%N/A5.5 $4.62 3/15/20231,580,000 shares $8.53 million -16.0%N/A2.9 $5.40 2/28/20231,880,000 shares $10.60 million +0.5%N/A3.3 $5.64 2/15/20231,870,000 shares $11.61 million -3.6%N/A3.3 $6.21 1/31/20231,940,000 shares $14.05 million -8.1%N/A3.4 $7.24 1/15/20232,110,000 shares $16.61 million +8.2%N/A3.6 $7.87 12/30/20221,950,000 shares $15.76 million -22.9%N/A3.7 $8.08 12/15/20222,530,000 shares $18.60 million -4.2%N/A5.3 $7.35 11/30/20222,640,000 shares $19.77 million -30.7%N/A6.9 $7.49 11/15/20223,810,000 shares $27.93 million -8.2%N/A10.7 $7.33 10/31/20224,150,000 shares $30.42 million +0.2%9.2%12.6 $7.33 10/15/20224,140,000 shares $23.14 million +2.7%9.2%11.3 $5.59 9/30/20224,030,000 shares $22.37 million -5.0%8.9%11.3 $5.55 9/15/20224,240,000 shares $24.34 million -11.3%9.4%5.8 $5.74 8/31/20224,780,000 shares $27.05 million -7.9%10.8%5.8 $5.66 8/15/20225,190,000 shares $36.90 million +7.7%11.7%5.7 $7.11 7/31/20224,820,000 shares $28.20 million -1.0%12.1%5 $5.85 7/15/20224,870,000 shares $28.49 million -12.7%12.7%5 $5.85 6/30/20225,580,000 shares $29.07 million +22.1%14.6%5.8 $5.21 6/15/20224,570,000 shares $17.55 million +33.2%11.9%7.3 $3.84 5/31/20223,430,000 shares $14.92 million +7.9%9.0%6.1 $4.35 5/15/20223,180,000 shares $14.63 million +49.3%8.3%6.5 $4.60 4/30/20222,130,000 shares $12.80 million +17.0%5.9%4.5 $6.01 4/15/20221,820,000 shares $13.21 million +9.0%5.1%3.7 $7.26 3/31/20221,670,000 shares $13.73 million +31.5%4.7%3.3 $8.22 3/15/20221,270,000 shares $10.29 million -15.9%3.5%2.2 $8.10 2/28/20221,510,000 shares $13.47 million -0.7%4.2%2.8 $8.92 2/15/20221,520,000 shares $13.77 million -9.5%4.2%2.8 $9.06 1/31/20221,680,000 shares $17.94 million -17.2%4.6%3.2 $10.68 1/15/20222,030,000 shares $21.72 million -13.6%5.6%4.8 $10.70 12/31/20212,350,000 shares $34.97 million +3.1%N/A6.4 $14.88 12/15/20212,280,000 shares $35.23 million +34.9%6.3%9.4 $15.45 11/30/20211,690,000 shares $28.87 million +3.7%4.7%7.3 $17.08 11/15/20211,630,000 shares $31.21 million -14.2%4.5%7.7 $19.15 10/29/20211,900,000 shares $38.30 million -1.0%5.3%8.8 $20.16 10/15/20211,920,000 shares $36.46 million -9.0%5.3%8.1 $18.99 9/30/20212,110,000 shares $39.86 million -16.6%5.8%8.1 $18.89 9/15/20212,530,000 shares $50.57 million -10.3%7.0%8.2 $19.99 8/31/20212,820,000 shares $61.25 million -2.1%7.8%8.3 $21.72 8/13/20212,880,000 shares $54.40 million -2.4%8.0%7.9 $18.89 7/30/20212,950,000 shares $50.24 million -0.3%8.1%7.3 $17.03 7/15/20212,960,000 shares $51.56 million -3.6%8.3%7.4 $17.42 6/30/20213,070,000 shares $57.07 million -9.4%8.6%7.4 $18.59 6/15/20213,390,000 shares $62.00 million -3.4%9.5%7.9 $18.29While Markets Slide, These "Genesis Cog" Trades Are Up Double-Digits (Ad)While most investors are struggling in today's volatile market, a small group of traders are quietly booking consistent gains. Just last week, our Genesis Cog subscribers captured an 11.51% gain shorting JEF, another 8.57% on CAKE, and 4.78% on RJF—all while the broader indexes continued their downward trend.Click here to discover how the Genesis Cog works in falling markets 5/28/20213,510,000 shares $65.32 million -4.9%9.9%7.4 $18.61 5/14/20213,690,000 shares $69.48 million No ChangeN/A7.5 $18.83 4/30/20213,690,000 shares $77.16 million No ChangeN/A7.7 $20.91 4/15/20213,690,000 shares $73.50 million +4.2%N/A7.1 $19.92 3/31/20213,540,000 shares $74.48 million +139.2%N/A6.4 $21.04 3/15/20211,480,000 shares $34.65 million +29.8%N/A2.6 $23.41 2/26/20211,140,000 shares $24.77 million +10.7%N/A1.8 $21.73 2/12/20211,030,000 shares $24.74 million +12.5%N/A1.6 $24.02 1/29/2021916,000 shares $20.43 million -19.7%N/A1.4 $22.30 1/15/20211,140,000 shares $29.56 million +1.8%N/A1.9 $25.93 12/31/20201,120,000 shares $24.45 million +85.3%N/A2.1 $21.83 12/15/2020604,400 shares $13.13 million -75.6%N/A1.2 $21.73 11/30/20202,480,000 shares $42.41 million -4.6%N/A5 $17.10 11/15/20202,600,000 shares $44.80 million -1.5%N/A6.9 $17.23 10/30/20202,640,000 shares $34.87 million -0.8%N/A6.8 $13.21 10/15/20202,660,000 shares $32.53 million -0.8%N/A7.8 $12.23 9/30/20202,680,000 shares $26.93 million +100.0%N/A7.9 $10.05 9/15/20201,340,000 shares $14.94 million +78.1%N/A3.9 $11.15 8/31/2020752,300 shares $7.53 million +3.9%3.3%2.6 $10.01 8/14/2020724,100 shares $6.15 million -5.6%3.2%3.9 $8.49 7/31/2020767,300 shares $5.96 million -3.3%N/A4.6 $7.77 7/15/2020793,500 shares $6.94 million +11.5%3.5%4.9 $8.74 6/30/2020711,600 shares $5.60 million +450.8%3.1%4.8 $7.87 6/15/2020129,200 shares $1.15 million +101.6%0.6%1.2 $8.88 5/29/202064,100 shares $615,360.00 +3.9%0.4%0.8 $9.60 5/15/202061,700 shares $556,534.00 -28.1%0.4%0.9 $9.02 4/30/202085,800 shares $845,130.00 +46.2%0.7%2.1 $9.85 4/15/202058,700 shares $588,761.00 -6.1%0.6%1.3 $10.03 3/31/202062,500 shares $690,625.00 -9.3%0.7%1.1 $11.05 STRO Short Interest - Frequently Asked Questions What is Sutro Biopharma's current short interest? Short interest is the volume of Sutro Biopharma shares that have been sold short but have not yet been covered or closed out. As of February 28th, traders have sold 4,460,000 shares of STRO short. 5.75% of Sutro Biopharma's shares are currently sold short. Learn More on Sutro Biopharma's current short interest. What is a good short interest ratio for Sutro Biopharma? 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. STRO shares currently have a short interest ratio of 4.0. Learn More on Sutro Biopharma's short interest ratio. Which institutional investors are shorting Sutro Biopharma? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Sutro Biopharma: Citadel Advisors LLC, and Concourse Financial Group Securities Inc.. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. What is a good short interest percentage for Sutro Biopharma? 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. 5.75% of Sutro Biopharma's floating shares are currently sold short. Is Sutro Biopharma's short interest increasing or decreasing? Sutro Biopharma saw a increase in short interest in the month of February. As of February 28th, there was short interest totaling 4,460,000 shares, an increase of 1.1% from the previous total of 4,410,000 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 Sutro Biopharma's short interest compare to its competitors? 5.75% of Sutro Biopharma's shares are currently sold short. Here is how the short interest of companies in the industry of "pharmaceutical products" compare to Sutro Biopharma: Esperion Therapeutics, Inc. (14.88%), Annexon, Inc. (11.71%), ProKidney Corp. (12.98%), Corvus Pharmaceuticals, Inc. (12.12%), Alpha Teknova, Inc. (15.69%), Candel Therapeutics, Inc. (10.29%), Aquestive Therapeutics, Inc. (11.88%), iTeos Therapeutics, Inc. (3.86%), Design Therapeutics, Inc. (10.46%), Terns Pharmaceuticals, Inc. (9.74%), 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 Sutro Biopharma stock? Short selling STRO is an investing strategy that aims to generate trading profit from Sutro Biopharma as its price is falling. STRO shares are trading down $0.00 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 Sutro Biopharma? A short squeeze for Sutro Biopharma 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 STRO, which in turn drives the price of the stock up even further. How often is Sutro Biopharma'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 STRO, twice per month. The most recent reporting period available is February, 28 2025. More Short Interest Resources from MarketBeat Related Companies ESPR Short Squeeze ANNX Short Squeeze PROK Short Squeeze CRVS Short Squeeze TKNO Short Squeeze CADL Short Squeeze AQST Short Squeeze ITOS Short Squeeze DSGN Short Squeeze TERN 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:STRO) was last updated on 3/25/2025 by MarketBeat.com Staff From Our PartnersYour Wealth is Under AttackPlease don't wait—this is your moment to take action. 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