Sutro Biopharma (STRO) Short Interest Ratio & Short Volume $0.84 +0.02 (+2.16%) As of 10:40 AM Eastern This is a fair market value price provided by Polygon.io. Learn more. Add Compare Share Share Short Interest Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFDA EventsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Sutro Biopharma Short Interest DataSutro Biopharma (STRO) has a short interest of 3.66 million shares. This marks a 0.00% change in short interest from the previous month. The short interest ratio (days to cover) is 2.7, indicating that it would take 2.7 days of the average trading volume of 1.33 million shares to cover all short positions.Current Short Interest3,660,000 sharesPrevious Short Interest3,660,000 sharesChange Vs. Previous MonthNo ChangeDollar Volume Sold Short$2.75 millionShort Interest Ratio2.7 Days to CoverLast Record DateJuly 15, 2025Outstanding Shares84,460,000 sharesPercentage of Shares Shorted4.33%Today's Trading Volume109,341 sharesAverage Trading Volume1,327,208 sharesToday's Volume Vs. Average8% 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 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 7/15/20253,660,000 shares $2.75 million No ChangeN/A2.7 $0.75 6/30/20253,660,000 shares $2.61 million -51.6%4.5%2.4 $0.71 6/15/20257,560,000 shares $6.04 million +34.3%9.3%5.2 $0.80 5/31/20255,630,000 shares $5.08 million -17.9%7.3%3 $0.90 5/15/20256,860,000 shares $6.03 million +28.5%8.8%3.7 $0.88 4/30/20255,340,000 shares $5.61 million -1.5%N/A2.9 $1.05 4/15/20255,420,000 shares $3.14 million +1.1%7.0%3.2 $0.58 3/31/20255,360,000 shares $3.49 million +15.5%6.9%3.8 $0.65 3/15/20254,640,000 shares $3.76 million +4.0%6.0%3.5 $0.81 2/28/20254,460,000 shares $7.09 million +1.1%5.7%4.2 $1.59 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. 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 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 $2.61Your blueprint for crypto wealth (Ad)Mark August 12th on your calendar. 27 of crypto's most successful minds are about to reveal everything…Claim your pass to the Crypto Community Summit here (free for a limited time) 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 $4.73 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 $20.16Your blueprint for crypto wealth (Ad)Mark August 12th on your calendar. 27 of crypto's most successful minds are about to reveal everything…Claim your pass to the Crypto Community Summit here (free for a limited time) 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 $18.29 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 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 July 15th, traders have sold 3,660,000 shares of STRO 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 3.0. Learn More on Sutro Biopharma's short interest ratio. How does Sutro Biopharma's short interest compare to its competitors? Here is how the short interest of companies in the industry of "pharmaceutical products" compare to Sutro Biopharma: scPharmaceuticals, Inc. (2.99%), Heron Therapeutics, Inc. (23.15%), Mereo BioPharma Group plc - Sponsored ADR (6.19%), Alpha Teknova, Inc. (25.97%), Annexon, Inc. (9.53%), Lifecore Biomedical, Inc. (7.60%), DBV Technologies S.A. (0.05%), Aurora Cannabis Inc. (11.00%), Monopar Therapeutics Inc. (3.46%), Prima BioMed Ltd (2.83%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: Coinbase Global, Inc. ($5.11 billion), Charter Communications, Inc. ($4.76 billion), Reddit Inc. ($2.84 billion), SoFi Technologies, Inc. ($2.79 billion), Seagate Technology Holdings PLC ($2.79 billion), Live Nation Entertainment, Inc. ($2.67 billion), Rocket Lab Corporation ($2.49 billion), AST SpaceMobile, Inc. ($2.12 billion), Moderna, Inc. ($2.09 billion), and Omnicom Group Inc. ($2.04 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 up $0.02 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 July, 15 2025. More Short Interest Resources from MarketBeat Related Companies SCPH Short Squeeze HRTX Short Squeeze MREO Short Squeeze TKNO Short Squeeze ANNX Short Squeeze LFCR Short Squeeze DBVT Short Squeeze ACB Short Squeeze MNPR Short Squeeze IMMP 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 8/5/2025 by MarketBeat.com Staff From Our PartnersBREAKING: The House just passed 3 pro-crypto bills!THREE pro-crypto bills just passed the House! Now, experts believe altcoin season is officially here. 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