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Sutro Biopharma (STRO) Short Interest Ratio & Short Volume

Sutro Biopharma logo
$25.53 +0.15 (+0.59%)
As of 04:00 PM Eastern
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Sutro Biopharma Short Interest Overview

As of July 15, 2026, Sutro Biopharma (STRO) had a short interest of 1.65 million shares sold short, representing 10.16% of the public float. This marks a 21.36% increase in short interest since the prior report. The short interest ratio (days to cover) is 4.5, meaning it would take 4.5 days of the average trading volume of 250,969 shares to cover all short positions.

Current Short Interest
1,652,824 shares
Previous Short Interest
1,361,955 shares
Change Vs. Previous Month
21.36%
Dollar Volume Sold Short
$42.97 million
Short Interest Ratio
4.5 Days to Cover
Last Record Date
July 15, 2026
Outstanding Shares
16,570,000 shares
Short Percent of Float
10.16%
Today's Trading Volume
135,115 shares
Average Trading Volume
250,969 shares
Today's Volume Vs. Average
54%
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Short Interest ChartDays to Cover ChartShort Percent of Float Chart

STRO Short Interest Over Time

STRO Days to Cover Over Time

STRO Percentage of Float Shorted Over Time

Sutro Biopharma Tesla Short Interest History & Recent Changes

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Report DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date
7/15/20261,652,824 shares $42.97 million +21.4%10.2%4.46 $26.00
6/30/20261,361,955 shares $45.22 million +47.7%8.5%2.31 $33.20
6/15/2026922,188 shares $27.85 million +22.7%5.8%3.9 $30.20
5/29/2026751,365 shares $21.96 million -37.0%4.8%1.73 $29.23
5/15/20261,193,156 shares $46.50 million +22.1%7.5%5.61 $38.97
4/30/2026977,108 shares $35.78 million +30.5%6.3%3.91 $36.62
4/15/2026748,699 shares $22.29 million +17.0%4.7%2.88 $29.77
3/31/2026639,714 shares $15.94 million +20.1%3.9%2.79 $24.91
3/13/2026532,614 shares $12.29 million +2.9%6.6%3.17 $23.08
2/27/2026517,388 shares $10.59 million -19.8%6.5%5.15 $20.47
2/13/2026645,074 shares $10.42 million +9.1%4.1%4.43 $16.16
1/30/2026591,301 shares $8.84 million +11.9%7.4%5.03 $14.95
1/15/2026528,233 shares $6.90 million +30.5%6.6%4.03 $13.07
12/31/2025404,777 shares $4.68 million -27.8%5.1%3.72 $11.57
12/15/2025560,264 shares $5.56 million -85.9%7.0%4.01 $9.93
11/28/20253,977,435 shares $36.23 million +12.9%49.6%6.34 $9.11
11/14/20253,521,612 shares $3.19 million +3.8%4.4%4.29 $0.90
10/31/20253,393,235 shares $3.80 million +35.4%4.2%1.47 $1.12
10/15/20252,510,000 shares $1.96 million +1.2%3.1%3.2 $0.78
9/30/20252,480,000 shares $2.15 million -1.6%N/A5.1 $0.87
9/15/20252,520,000 shares $2.24 million -19.0%N/A3.6 $0.89
8/31/20253,110,000 shares $2.67 million -11.9%3.8%4.1 $0.86
8/15/20253,530,000 shares $3.10 million +4.4%N/A4.6 $0.88
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
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
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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 $2.61
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
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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

STRO Short Interest - Frequently Asked Questions

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 15th, investors have sold 1,652,824 shares of STRO short. 10.16% of Sutro Biopharma's shares are currently sold short. Learn More on Sutro Biopharma's current short interest.

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 4.5. Learn More on Sutro Biopharma's short interest ratio.

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. 10.16% of Sutro Biopharma's floating shares are currently sold short.

Sutro Biopharma saw a increase in short interest in July. As of July 15th, there was short interest totaling 1,652,824 shares, an increase of 21.4% from the previous total of 1,361,955 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.

10.16% of Sutro Biopharma's shares are currently sold short. Here is how the short interest of companies in the industry of "biotechnology" compare to Sutro Biopharma: Recursion Pharmaceuticals, Inc. (36.54%), AnaptysBio, Inc. (24.65%), Sarepta Therapeutics, Inc. (28.98%), Septerna, Inc. (7.89%), Xencor, Inc. (15.41%), Intellia Therapeutics, Inc. (33.95%), Maze Therapeutics, Inc. (10.54%), Vir Biotechnology, Inc. (11.27%), Monte Rosa Therapeutics, Inc. (21.75%), ArriVent BioPharma, Inc. (18.00%),

As of the most recent reporting period, the following stocks had the largest short interest positions: SPDR S&P 500 ETF Trust ($73.09 billion), Invesco QQQ ($48.11 billion), iShares Russell 2000 ETF ($23.61 billion), Sandisk Corporation ($12.69 billion), Nebius Group N.V. ($12.18 billion), Western Digital Corporation ($11.95 billion), SPDR S&P Biotech ETF ($11.73 billion), Quhuo Limited Sponsored ADR ($9.74 billion), VanEck Semiconductor ETF ($9.57 billion), and Financial Select Sector SPDR Fund ($8.43 billion). View all of the most shorted stocks.

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 $0.36 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.

A short squeeze for Sutro Biopharma 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 STRO, which in turn drives the price of the stock up even further.

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 2026.

Understanding short interest metrics can help you assess how traders are positioning around a stock like STRO:

  • Shares Sold Short: The total number of shares that have been sold by short sellers but have not yet been covered or closed out. A high number may indicate bearish sentiment.
  • Short Float: The percentage of a company’s publicly available shares (or "float") that are sold short. A higher short float suggests a greater portion of the stock is being bet against.
  • Days to Cover (Short Interest Ratio): This estimates how many days it would take short sellers to cover their positions, based on average daily trading volume. Higher values can signal potential for a short squeeze if buying pressure increases.

These metrics are often used by traders to gauge sentiment, volatility risk, and the potential for price movements based on short covering activity.


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Short Interest Tools

Short interest data for NASDAQ:STRO is sourced from the Financial Industry Regulatory Authority (FINRA), with the most recent report published on 7/24/2026. FINRA publishes updated short interest twice a month.
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