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Geron (GERN) Short Interest Ratio & Short Volume

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$1.29 -0.11 (-7.86%)
Closing price 05/15/2026 04:00 PM Eastern
Extended Trading
$1.31 +0.02 (+1.55%)
As of 05/15/2026 07:59 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 Massive. Learn more.
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Geron Short Interest Overview

As of April 30, 2026, Geron (GERN) had a short interest of 75.70 million shares sold short, representing 12.00% of the public float. This marks a -7.86% decrease in short interest since the prior report. The short interest ratio (days to cover) is 5.5, meaning it would take 5.5 days of the average trading volume of 16.67 million shares to cover all short positions.

Current Short Interest
75,696,666 shares
Previous Short Interest
82,155,104 shares
Change Vs. Previous Month
-7.86%
Dollar Volume Sold Short
$116.57 million
Short Interest Ratio
5.5 Days to Cover
Last Record Date
April 30, 2026
Outstanding Shares
641,520,000 shares
Short Percent of Float
12.00%
Today's Trading Volume
16,152,124 shares
Average Trading Volume
16,674,552 shares
Today's Volume Vs. Average
97%
Short Selling Geron?
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Short Interest ChartDays to Cover ChartShort Percent of Float Chart

GERN Short Interest Over Time

GERN Days to Cover Over Time

GERN Percentage of Float Shorted Over Time

Geron 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
4/30/202675,696,666 shares $116.57 million -7.9%12.0%5.52 $1.54
4/15/202682,155,104 shares $138.84 million +7.2%13.0%3.57 $1.69
3/31/202676,666,335 shares $114.23 million +21.3%12.9%4.17 $1.49
3/13/202663,223,778 shares $99.89 million +4.3%10.7%3.45 $1.58
2/27/202660,621,875 shares $101.84 million -6.8%10.2%2.91 $1.68
2/13/202665,027,742 shares $107.30 million +11.2%11.0%4.3 $1.65
1/30/202658,456,685 shares $80.09 million -17.0%9.9%4.64 $1.37
1/15/202670,452,831 shares $91.59 million -1.1%11.9%7.45 $1.30
12/31/202571,256,970 shares $94.06 million -6.3%12.1%11.61 $1.32
12/15/202576,015,555 shares $101.10 million -1.8%12.9%10.25 $1.33
11/28/202577,376,655 shares $102.91 million -0.3%13.1%11.02 $1.33
11/14/202577,603,709 shares $86.92 million -9.0%13.1%6.99 $1.12
10/31/202585,259,940 shares $107.43 million -1.9%14.4%13.95 $1.26
10/15/202586,920,000 shares $111.26 million -3.2%14.7%10.2 $1.28
9/30/202589,780,000 shares $123.00 million -2.6%N/A10.7 $1.37
9/15/202592,130,000 shares $117.01 million +4.1%N/A10.1 $1.27
8/31/202588,540,000 shares $123.96 million +2.2%15.0%9.5 $1.40
8/15/202586,670,000 shares $125.67 million +12.4%N/A8.4 $1.45
7/31/202577,120,000 shares $88.69 million +13.5%13.1%7.1 $1.15
7/15/202567,960,000 shares $85.63 million +7.9%N/A6.5 $1.26
6/30/202562,990,000 shares $88.82 million -3.4%10.7%5.6 $1.41
6/15/202565,230,000 shares $98.50 million +1.0%11.1%5.4 $1.51
5/31/202564,580,000 shares $99.78 million -3.9%11.0%5 $1.55
5/15/202567,190,000 shares $81.30 million +5.2%11.5%4.5 $1.21
4/30/202563,860,000 shares $90.04 million +2.6%N/A4.2 $1.41
4/15/202562,230,000 shares $77.79 million +3.9%10.6%4.1 $1.25
3/31/202559,890,000 shares $95.23 million +31.3%10.2%4 $1.59
3/15/202545,630,000 shares $74.83 million -21.9%7.8%3 $1.64
2/28/202558,410,000 shares $102.80 million -16.3%10.0%4.1 $1.76
2/15/202569,770,000 shares $178.61 million -6.4%11.9%5.6 $2.56
1/31/202574,570,000 shares $214.02 million +1.2%N/A6.7 $2.87
1/15/202573,710,000 shares $221.87 million +13.3%N/A7.3 $3.01
12/31/202465,070,000 shares $230.35 million +0.9%N/A6.6 $3.54
12/15/202464,520,000 shares $249.05 million -2.8%N/A7.7 $3.86
11/30/202466,350,000 shares $273.36 million -5.4%N/A8.2 $4.12
11/15/202470,130,000 shares $256.68 million -8.0%N/A8.2 $3.66
10/31/202476,240,000 shares $313.35 million -3.3%N/A9.4 $4.11
10/15/202478,830,000 shares $330.30 million -2.7%N/A8.9 $4.19
9/30/202481,030,000 shares $367.88 million +13.3%N/A9.1 $4.54
9/15/202471,510,000 shares $322.51 million +6.5%N/A7.5 $4.51
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8/31/202467,140,000 shares $318.92 million -2.9%N/A5.8 $4.75
8/15/202469,110,000 shares $308.23 million +19.4%N/A5.8 $4.46
7/31/202457,860,000 shares $274.26 million +29.6%N/A4.9 $4.74
7/15/202444,660,000 shares $218.83 million -5.1%N/A3.9 $4.90
6/30/202447,050,000 shares $199.49 million -13.1%N/A4 $4.24
6/15/202454,120,000 shares $263.56 million -1.6%N/A4.6 $4.87
5/31/202455,010,000 shares $195.29 million +2.1%N/A3.8 $3.55
5/15/202453,890,000 shares $210.17 million +3.0%N/A4.3 $3.90
4/30/202452,340,000 shares $205.70 million +5.9%N/A4.1 $3.93
4/15/202449,420,000 shares $170.50 million +5.9%N/A4 $3.45
3/31/202446,660,000 shares $153.98 million -8.4%N/A4.2 $3.30
3/15/202450,950,000 shares $171.19 million +13.5%N/A4.7 $3.36
2/29/202444,910,000 shares $89.82 million +3.1%N/A6.1 $2.00
2/15/202443,570,000 shares $91.06 million +7.1%N/A6.9 $2.09
1/31/202440,690,000 shares $74.87 million +2.3%N/A7 $1.84
1/15/202439,790,000 shares $80.77 million -7.9%N/A7.6 $2.03
12/31/202343,220,000 shares $91.19 million -6.8%N/A8.1 $2.11
12/15/202346,370,000 shares $104.33 million +4.3%N/A8.5 $2.25
11/30/202344,440,000 shares $85.77 million -0.1%N/A8 $1.93
11/15/202344,480,000 shares $86.29 million -1.4%N/A7.9 $1.94
10/31/202345,120,000 shares $85.73 million +0.4%N/A7.7 $1.90
10/15/202344,940,000 shares $79.99 million +3.6%N/A8.1 $1.78
9/30/202343,400,000 shares $92.01 million +6.7%N/A8.3 $2.12
9/15/202340,680,000 shares $89.90 million +22.2%N/A8 $2.21
8/31/202333,290,000 shares $80.89 million +17.6%N/A6.2 $2.43
8/15/202328,300,000 shares $84.33 million +5.0%N/A5 $2.98
7/31/202326,950,000 shares $87.32 million +2.5%N/A4.8 $3.24
7/15/202326,300,000 shares $84.69 million -5.3%N/A4.4 $3.22
6/30/202327,760,000 shares $89.11 million -2.4%N/A4.3 $3.21
6/15/202328,440,000 shares $86.17 million -1.8%N/A4.3 $3.03
5/31/202328,960,000 shares $94.70 million +25.4%N/A4.6 $3.27
5/15/202323,100,000 shares $70.22 million -2.2%N/A4.1 $3.04
4/30/202323,610,000 shares $58.08 million +5.3%N/A4.3 $2.46
4/15/202322,420,000 shares $44.17 million -8.7%N/A4 $1.97
3/31/202324,550,000 shares $53.27 million -5.1%N/A4.1 $2.17
3/15/202325,860,000 shares $67.75 million +5.1%N/A2.9 $2.62
2/28/202324,600,000 shares $68.39 million +3.8%N/A2.9 $2.78
2/15/202323,710,000 shares $63.78 million -3.4%N/A2.8 $2.69
1/31/202324,550,000 shares $81.02 million +8.1%N/A3 $3.30
1/15/202322,710,000 shares $71.76 million -22.2%N/A2.8 $3.16
12/30/202229,190,000 shares $70.64 million +26.4%N/A3.9 $2.42
12/15/202223,100,000 shares $53.13 million +24.5%N/A6 $2.30
11/30/202218,550,000 shares $43.04 million -2.5%N/A5.3 $2.32
11/15/202219,020,000 shares $43.18 million +15.3%N/A5.2 $2.27
10/31/202216,500,000 shares $36.63 million +14.9%N/A4.1 $2.22
10/15/202214,360,000 shares $31.59 million +6.7%N/A3.6 $2.20
9/30/202213,460,000 shares $31.50 million +12.1%N/A3.7 $2.34
9/15/202212,010,000 shares $34.83 million -23.0%N/A3.1 $2.90
8/31/202215,600,000 shares $41.18 million -17.6%N/A4.3 $2.64
8/15/202218,920,000 shares $44.84 million +17.2%N/A5.9 $2.37
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7/31/202216,150,000 shares $30.69 million -2.2%N/A5.5 $1.90
7/15/202216,510,000 shares $30.05 million -33.1%N/A6.4 $1.82
6/30/202224,670,000 shares $38.24 million -7.6%N/A9.3 $1.55
6/15/202226,700,000 shares $34.71 million +7.1%14.4%9.7 $1.30
5/31/202224,940,000 shares $34.42 million +7.2%N/A10 $1.38
5/15/202223,260,000 shares $33.73 million +5.1%N/A9.3 $1.45
4/30/202222,130,000 shares $31.20 million +4.5%N/A9.5 $1.41
4/15/202221,170,000 shares $32.60 million -21.0%N/A9 $1.54
3/31/202226,780,000 shares $36.42 million +4.5%N/A11.5 $1.36
3/15/202225,640,000 shares $26.67 million +15.6%8.4%12.8 $1.04
2/28/202222,190,000 shares $24.19 million +1.6%7.3%10.7 $1.09
2/15/202221,840,000 shares $23.15 million +16.4%7.2%10.3 $1.06
1/31/202218,770,000 shares $21.02 million +0.6%6.2%8.8 $1.12
1/15/202218,660,000 shares $22.39 million +6.6%N/A8.5 $1.20
12/31/202117,510,000 shares $21.36 million -9.9%5.8%8.4 $1.22
12/15/202119,430,000 shares $26.62 million +11.0%6.4%10.4 $1.37
11/30/202117,510,000 shares $25.91 million -6.7%5.8%9.6 $1.48
11/15/202118,770,000 shares $28.34 million No Change6.1%10.5 $1.51
10/29/202118,770,000 shares $28.91 million -3.7%6.1%10.4 $1.54
10/15/202119,500,000 shares $27.50 million +7.4%6.4%11.2 $1.41
9/30/202118,160,000 shares $24.88 million -11.1%5.9%10.1 $1.37
9/15/202120,420,000 shares $27.77 million -11.3%6.7%9.3 $1.36
8/31/202123,010,000 shares $33.36 million -8.2%7.5%2.8 $1.45
8/13/202125,070,000 shares $30.59 million +3.2%8.2%3 $1.22
7/30/202124,300,000 shares $29.65 million +1.5%8.0%2.9 $1.22
7/15/202123,940,000 shares $29.93 million +3.2%7.9%2.9 $1.25
6/30/202123,190,000 shares $32.70 million -9.2%7.6%2.8 $1.41
6/15/202125,530,000 shares $35.49 million -4.9%8.4%3.2 $1.39
5/28/202126,840,000 shares $37.04 million -2.2%8.8%12.4 $1.38

GERN Short Interest - Frequently Asked Questions

Short interest is the volume of Geron shares that have been sold short but have not yet been covered or closed out. As of April 30th, investors have sold 75,696,666 shares of GERN short. 12.00% of Geron's shares are currently sold short. Learn More on Geron'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. GERN shares currently have a short interest ratio of 5.5. Learn More on Geron'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. 12.00% of Geron's floating shares are currently sold short.

Geron saw a decline in short interest in April. As of April 30th, there was short interest totaling 75,696,666 shares, a decline of 7.9% from the previous total of 82,155,104 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.

12.00% of Geron's shares are currently sold short. Here is how the short interest of companies in the industry of "biotechnology" compare to Geron: Alkermes plc (12.43%), Celldex Therapeutics, Inc. (10.21%), BioCryst Pharmaceuticals, Inc. (15.51%), Innoviva, Inc. (8.66%), Novavax, Inc. (30.39%), Zenas BioPharma, Inc. (24.25%), MannKind Corporation (9.88%), OPKO Health, Inc. (8.89%), Ironwood Pharmaceuticals, Inc. (11.67%), Lexicon Pharmaceuticals, Inc. (6.25%),

As of the most recent reporting period, the following stocks had the largest short interest positions: SPDR S&P 500 ETF Trust ($86.09 billion), Invesco QQQ ($39.89 billion), iShares Russell 2000 ETF ($26.13 billion), Western Digital Corporation ($12.66 billion), Salesforce Inc. ($12.29 billion), Sandisk Corporation ($11.87 billion), SPDR S&P Biotech ETF ($9.82 billion), Lumentum Holdings Inc. ($8.51 billion), iShares 20+ Year Treasury Bond ETF ($7.76 billion), and Bloom Energy Corporation ($7.40 billion). View all of the most shorted stocks.

Short selling GERN is an investing strategy that aims to generate trading profit from Geron as its price is falling. GERN shares are trading down $0.11 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 Geron 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 GERN, 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 GERN, twice per month. The most recent reporting period available is April, 30 2026.

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

  • 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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This page (NASDAQ:GERN) was last updated on 5/16/2026 by MarketBeat.com Staff.
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