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Certara (CERT) Short Interest Ratio & Short Volume

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$8.13 -0.27 (-3.21%)
Closing price 09/16/2026 04:00 PM Eastern
Extended Trading
$8.39 +0.26 (+3.25%)
As of 07:01 AM 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 Massive. Learn more.
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Certara Short Interest Overview

As of August 31, 2026, Certara (CERT) had a short interest of 28.97 million shares sold short, representing 19.20% of the public float. This marks a 14.83% increase in short interest since the prior report. The short interest ratio (days to cover) is 13.1, meaning it would take 13.1 days of the average trading volume of 1.86 million shares to cover all short positions.

Current Short Interest
28,972,317 shares
Previous Short Interest
25,229,619 shares
Change Vs. Previous Month
14.83%
Dollar Volume Sold Short
$240.18 million
Short Interest Ratio
13.1 Days to Cover
Last Record Date
August 31, 2026
Outstanding Shares
152,540,000 shares
Short Percent of Float
19.20%
Today's Trading Volume
3,914,579 shares
Average Trading Volume
1,863,527 shares
Today's Volume Vs. Average
210%
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Short Interest ChartDays to Cover ChartShort Percent of Float Chart

CERT Short Interest Over Time

CERT Days to Cover Over Time

CERT Percentage of Float Shorted Over Time

Certara 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
8/31/202628,972,317 shares $240.18 million +14.8%19.2%13.09 $8.29
8/14/202625,229,619 shares $201.84 million -12.5%16.7%6.17 $8.00
7/31/202628,839,594 shares $233.60 million -3.0%19.1%7.73 $8.10
7/15/202629,729,468 shares $209.89 million +1.2%19.3%7.81 $7.06
6/30/202629,382,164 shares $192.45 million +3.0%19.1%5.04 $6.55
6/15/202628,531,301 shares $148.65 million -0.8%18.5%7.25 $5.21
5/29/202628,750,194 shares $167.33 million +13.7%18.7%7.38 $5.82
5/15/202625,279,253 shares $113.25 million +4.8%16.4%6.59 $4.48
4/30/202624,121,303 shares $147.86 million +7.2%15.9%8.58 $6.13
4/15/202622,502,892 shares $138.39 million +1.0%14.6%5.53 $6.15
3/31/202622,291,831 shares $127.06 million -6.3%14.5%4.61 $5.70
3/13/202623,791,072 shares $158.21 million +5.9%15.3%6.58 $6.65
2/27/202622,461,223 shares $159.03 million +2.6%14.6%7.4 $7.08
2/13/202621,897,562 shares $144.96 million +5.2%14.2%6.51 $6.62
1/30/202620,810,829 shares $182.93 million -3.5%13.4%11.92 $8.79
1/15/202621,557,206 shares $205.22 million +5.0%13.9%10.27 $9.52
12/31/202520,536,709 shares $180.93 million +11.4%13.2%9.66 $8.81
12/15/202518,428,670 shares $161.07 million -8.5%11.8%9.23 $8.74
11/28/202520,132,940 shares $184.32 million +10.6%12.9%9 $9.16
11/14/202518,196,578 shares $151.58 million +2.2%11.7%5.44 $8.33
10/31/202517,813,224 shares $207.17 million +12.3%11.4%11.84 $11.63
10/15/202515,860,000 shares $189.84 million +2.7%13.6%9.7 $11.97
9/30/202515,450,000 shares $188.80 million +5.0%13.3%9.4 $12.22
9/15/202514,720,000 shares $165.16 million +9.5%12.6%9 $11.22
8/31/202513,440,000 shares $145.69 million +6.7%11.5%8.1 $10.84
8/15/202512,600,000 shares $138.85 million +12.6%10.8%7.8 $11.02
7/31/202511,190,000 shares $110.11 million +13.8%9.5%6.5 $9.84
7/15/20259,830,000 shares $102.33 million +3.7%8.2%5.4 $10.41
6/30/20259,480,000 shares $110.92 million +5.8%7.9%4.5 $11.70
6/15/20258,960,000 shares $98.65 million +7.7%7.5%4.3 $11.01
5/31/20258,320,000 shares $94.76 million -2.2%7.0%4.3 $11.39
5/15/20258,510,000 shares $98.89 million -9.7%7.1%4.3 $11.62
4/30/20259,420,000 shares $130.56 million +3.9%7.7%4.9 $13.86
4/15/20259,070,000 shares $125.89 million +46.8%7.5%5 $13.88
3/31/20256,180,000 shares $61.18 million +4.6%5.1%4.3 $9.90
3/15/20255,910,000 shares $64.54 million +10.1%4.9%4.5 $10.92
2/28/20255,370,000 shares $64.33 million -13.0%4.4%4 $11.98
2/15/20256,170,000 shares $87.55 million +17.3%5.1%4.8 $14.19
1/31/20255,260,000 shares $74.85 million +18.7%4.7%4.2 $14.23
1/15/20254,430,000 shares $52.98 million +5.7%4.0%3.6 $11.96
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12/31/20244,190,000 shares $44.62 million -1.6%3.8%3.6 $10.65
12/15/20244,260,000 shares $48.86 million -13.9%3.8%3.5 $11.47
11/30/20244,950,000 shares $55.49 million -0.2%4.5%3.7 $11.21
11/15/20244,960,000 shares $49.40 million -7.5%4.5%3.8 $9.96
10/31/20245,360,000 shares $54.67 million +31.4%4.8%4.2 $10.20
10/15/20244,080,000 shares $45.74 million +4.1%3.7%3.4 $11.21
9/30/20243,920,000 shares $45.90 million -9.5%3.5%3.5 $11.71
9/15/20244,330,000 shares $47.41 million -18.2%3.9%4.2 $10.95
8/31/20245,290,000 shares $64.80 million -4.9%4.8%6.3 $12.25
8/15/20245,560,000 shares $67.61 million +11.2%5.0%7.8 $12.16
7/31/20245,000,000 shares $78.05 million +0.2%4.5%7.7 $15.61
7/15/20244,990,000 shares $78.09 million -0.8%4.5%8.3 $15.65
6/30/20245,030,000 shares $69.67 million +14.3%4.6%8.8 $13.85
6/15/20244,400,000 shares $65.52 million -15.7%4.0%7.6 $14.89
5/31/20245,220,000 shares $88.48 million -7.9%4.8%9.7 $16.95
5/15/20245,670,000 shares $90.27 million -0.5%5.2%10.4 $15.92
4/30/20245,700,000 shares $97.53 million -0.2%5.2%10.7 $17.11
4/15/20245,710,000 shares $99.58 million +0.7%5.2%10.3 $17.44
3/31/20245,670,000 shares $101.38 million +7.4%5.2%10.3 $17.88
3/15/20245,280,000 shares $97.47 million +12.6%4.8%10 $18.46
2/29/20244,690,000 shares $79.17 million -0.9%4.3%8.1 $16.88
2/15/20244,730,000 shares $85.80 million +3.1%4.3%8.6 $18.14
1/31/20244,590,000 shares $74.17 million +7.8%4.2%7.5 $16.16
1/15/20244,260,000 shares $69.61 million -10.7%3.9%6.9 $16.34
12/31/20234,770,000 shares $83.90 million -7.7%4.4%7.4 $17.59
12/15/20235,170,000 shares $87.89 million +11.7%4.7%7.7 $17.00
11/30/20234,630,000 shares $66.72 million -1.3%4.2%6.8 $14.41
11/15/20234,690,000 shares $69.08 million -11.0%4.3%6.9 $14.73
10/31/20235,270,000 shares $64.24 million -18.7%4.8%7.4 $12.19
10/15/20236,480,000 shares $89.04 million +4.9%6.0%9.4 $13.74
9/30/20236,180,000 shares $89.86 million +3.0%5.7%9.2 $14.54
9/15/20236,000,000 shares $84.60 million -8.0%5.5%8.1 $14.10
8/31/20236,520,000 shares $105.36 million -5.5%6.0%7.3 $16.16
8/15/20236,900,000 shares $116.61 million -3.5%6.4%6.6 $16.90
7/31/20237,150,000 shares $139.21 million +3.5%6.6%6.5 $19.47
7/15/20236,910,000 shares $133.02 million -11.0%6.4%5.9 $19.25
6/30/20237,760,000 shares $141.31 million -13.1%7.2%6.4 $18.21
6/15/20238,930,000 shares $158.86 million -14.0%11.4%7.3 $17.79
5/31/202310,380,000 shares $215.70 million +26.9%13.3%6.1 $20.78
5/15/20238,180,000 shares $166.71 million +1.9%10.5%5.2 $20.38
4/30/20238,030,000 shares $194.09 million +11.5%10.3%5.5 $24.17
4/15/20237,200,000 shares $173.45 million -3.1%9.3%5.3 $24.09
3/31/20237,430,000 shares $179.14 million +164.4%10.4%5.6 $24.11
3/15/20232,810,000 shares $57.77 million -8.5%3.9%2.3 $20.56
2/28/20233,070,000 shares $55.63 million +4.1%4.3%4.8 $18.12
2/15/20232,950,000 shares $57.35 million +2.1%4.1%4.6 $19.44
1/31/20232,890,000 shares $56.07 million +5.5%4.1%3.9 $19.40
1/15/20232,740,000 shares $47.65 million +0.7%3.8%3.6 $17.39
12/30/20222,720,000 shares $43.71 million -8.1%3.8%3.6 $16.07
12/15/20222,960,000 shares $48.54 million -3.3%4.1%3.9 $16.40
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11/30/20223,060,000 shares $51.96 million +5.2%3.0%3.8 $16.98
11/15/20222,910,000 shares $45.34 million +32.3%2.9%3.7 $15.58
10/31/20222,200,000 shares $26.91 million +15.2%2.2%2.4 $12.23
10/15/20221,910,000 shares $22.23 million +11.1%1.9%2.3 $11.64
9/30/20221,720,000 shares $22.84 million +5.5%1.7%2.2 $13.28
9/15/20221,630,000 shares $24.38 million -30.6%1.6%2.1 $14.96
8/31/20222,350,000 shares $36.82 million -7.5%2.3%3.2 $15.67
8/15/20222,540,000 shares $45.44 million -1.2%2.3%3.6 $17.89
7/31/20222,570,000 shares $59.08 million -4.1%2.5%5 $22.99
7/15/20222,680,000 shares $59.74 million -5.6%2.6%5 $22.29
6/30/20222,840,000 shares $60.95 million -9.0%2.8%5.1 $21.46
6/15/20223,120,000 shares $58.91 million -15.7%3.1%5.9 $18.88
5/31/20223,700,000 shares $75.18 million +16.7%3.7%6.4 $20.32
5/15/20223,170,000 shares $60.55 million -7.6%3.2%5 $19.10
4/30/20223,430,000 shares $62.94 million +7.2%3.4%5.5 $18.35
4/15/20223,200,000 shares $67.36 million +12.7%3.2%5 $21.05
3/31/20222,840,000 shares $61.00 million -4.7%2.8%4.1 $21.48
3/15/20222,980,000 shares $56.71 million +7.2%3.0%4.1 $19.03
2/28/20222,780,000 shares $70.45 million -5.4%2.8%3.6 $25.34
2/15/20222,940,000 shares $78.38 million -3.3%2.9%3.7 $26.66
1/31/20223,040,000 shares $81.26 million -5.0%3.0%2.9 $26.73
1/15/20223,200,000 shares $88.93 million -3.6%3.2%3.1 $27.79
12/31/20213,320,000 shares $94.35 million +9.9%3.3%3.4 $28.42
12/15/20213,020,000 shares $83.32 million +69.7%3.0%3.1 $27.59
11/30/20211,780,000 shares $47.94 million -33.8%1.8%1.5 $26.93
11/15/20212,690,000 shares $102.33 million +6.8%3.0%2.3 $38.04
10/29/20212,520,000 shares $104.10 million -18.7%2.9%2.7 $41.31
10/15/20213,100,000 shares $117.30 million +12.3%3.5%3.4 $37.84
9/30/20212,760,000 shares $91.36 million +29.6%3.2%3.1 $33.10

CERT Short Interest - Frequently Asked Questions

Short interest is the volume of Certara shares that have been sold short but have not yet been closed out or covered. As of August 31st, traders have sold 28,972,317 shares of CERT short. 19.20% of Certara's shares are currently sold short. Learn More on Certara'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. CERT shares currently have a short interest ratio of 13.1. Learn More on Certara'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. 19.20% of Certara's floating shares are currently sold short.

Certara saw a increase in short interest during the month of August. As of August 31st, there was short interest totaling 28,972,317 shares, an increase of 14.8% from the previous total of 25,229,619 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.

19.20% of Certara's shares are currently sold short. Here is how the short interest of companies in the sector of "healthcare" compare to Certara: Doximity, Inc. (11.55%), Waystar Holding Corp. (7.63%), Heartflow, Inc. (7.56%), Schrodinger, Inc. (16.71%), GoodRx Holdings, Inc. (1.35%), Teladoc Health, Inc. (14.05%), HealthStream, Inc. (5.85%), SOPHiA GENETICS SA (1.38%), Phreesia, Inc. (4.97%), Claritev (5.85%),

As of the most recent reporting period, the following stocks had the largest short interest positions: SPDR S&P 500 ETF Trust ($62.68 billion), Invesco QQQ ($47.06 billion), iShares Russell 2000 ETF ($23.54 billion), SPDR S&P Biotech ETF ($12.10 billion), Nebius Group N.V. ($9.34 billion), Western Digital Corporation ($8.96 billion), Financial Select Sector SPDR Fund ($8.16 billion), iShares 20+ Year Treasury Bond ETF ($7.98 billion), iShares iBoxx $ High Yield Corporate Bond ETF ($7.52 billion), and VanEck Semiconductor ETF ($7.39 billion). View all of the most shorted stocks.

Short selling CERT is an investing strategy that aims to generate trading profit from Certara as its price is falling. CERT shares are trading down $0.27 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 Certara 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 CERT, 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 CERT, twice per month. The most recent reporting period available is August, 31 2026.

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

  • 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:CERT is sourced from the Financial Industry Regulatory Authority (FINRA), with the most recent report published on 9/10/2026. FINRA publishes updated short interest twice a month.
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