Sutro Biopharma (STRO) Short Interest Ratio & Short Volume $0.84 -0.02 (-2.48%) Closing price 08/25/2025 04:00 PM EasternExtended Trading$0.84 +0.00 (+0.30%) As of 08/25/2025 05:46 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 ForecastsChartCompetitorsEarningsFDA EventsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Sutro Biopharma Short Interest DataSutro Biopharma (STRO) has a short interest of 3.38 million shares, representing 4.14% of the float (the number of shares available for trading by the public). This marks a -7.65% decrease in short interest from the previous month. The short interest ratio (days to cover) is 3.8, indicating that it would take 3.8 days of the average trading volume of 381,347 shares to cover all short positions.Current Short Interest3,380,000 sharesPrevious Short Interest3,660,000 sharesChange Vs. Previous Month-7.65%Dollar Volume Sold Short$2.72 millionShort Interest Ratio3.8 Days to CoverLast Record DateJuly 31, 2025Outstanding Shares84,770,000 sharesShort Percent of Float4.14%Today's Trading Volume476,263 sharesAverage Trading Volume381,347 sharesToday's Volume Vs. Average125% 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 7/31/20253,380,000 shares $2.72 million -7.7%4.1%3.8 $0.81 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 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. 2/28/20254,460,000 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 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 $3.98Google did what!?!? (Ad)A new technology has sparked a modern-day gold rush in Silicon Valley. OpenAI’s Sam Altman invested $375M. Bill Gates has backed four companies in this space. The World Economic Forum calls it “the most exciting human discovery since fire.” Whitney Tilson believes this trend could mint a new class of wealthy investors—and he’s sharing one stock to watch now, for free.Gates and Altman are betting big—see why 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 $4.73 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 $19.15Google did what!?!? (Ad)A new technology has sparked a modern-day gold rush in Silicon Valley. OpenAI’s Sam Altman invested $375M. Bill Gates has backed four companies in this space. The World Economic Forum calls it “the most exciting human discovery since fire.” Whitney Tilson believes this trend could mint a new class of wealthy investors—and he’s sharing one stock to watch now, for free.Gates and Altman are betting big—see why 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 $18.29 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 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 closed out or covered. As of July 31st, traders have sold 3,380,000 shares of STRO short. 4.14% 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. 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. 4.14% of Sutro Biopharma's floating shares are currently sold short. Is Sutro Biopharma's short interest increasing or decreasing? Sutro Biopharma saw a decline in short interest in July. As of July 31st, there was short interest totaling 3,380,000 shares, a decline of 7.7% from the previous total of 3,660,000 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? 4.14% 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: Cartesian Therapeutics, Inc. (29.29%), Bright Minds Biosciences Inc. (4.13%), Neurogene Inc. (22.04%), Humacyte, Inc. (25.41%), Puma Biotechnology, Inc. (7.33%), Aurora Cannabis Inc. (10.10%), Monte Rosa Therapeutics, Inc. (18.84%), Foghorn Therapeutics Inc. (3.14%), Atea Pharmaceuticals, Inc. (6.94%), Mereo BioPharma Group plc - Sponsored ADR (7.02%), 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 ($70.87 billion), Invesco QQQ ($30.12 billion), iShares Russell 2000 ETF ($19.85 billion), iShares 20+ Year Treasury Bond ETF ($10.34 billion), Strategy Inc ($8.98 billion), iShares iBoxx $ Investment Grade Corporate Bond ETF ($7.61 billion), SPDR S&P Biotech ETF ($6.81 billion), Invesco S&P 500 Equal Weight ETF ($6.14 billion), Palo Alto Networks, Inc. ($5.97 billion), and Super Micro Computer, Inc. ($5.28 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 $0.02 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, 31 2025. More Short Interest Resources from MarketBeat Related Companies RNAC Short Squeeze DRUG Short Squeeze NGNE Short Squeeze HUMA Short Squeeze PBYI Short Squeeze ACB Short Squeeze GLUE Short Squeeze FHTX Short Squeeze AVIR Short Squeeze MREO 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 8/26/2025 by MarketBeat.com Staff From Our PartnersBuffett’s $325 Billion Cash Problem — Solved by Gold?A bombshell announcement is just weeks away — and it could send shockwaves through the gold market. 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