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Omeros (OMER) Short Interest Ratio & Short Volume

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$11.57 +0.29 (+2.61%)
As of 01:30 PM Eastern
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Omeros Short Interest Overview

As of July 15, 2026, Omeros (OMER) had a short interest of 15.09 million shares sold short, representing 23.30% of the public float. This marks a -0.29% decrease in short interest since the prior report. The short interest ratio (days to cover) is 11.9, meaning it would take 11.9 days of the average trading volume of 1.61 million shares to cover all short positions.

Current Short Interest
15,092,070 shares
Previous Short Interest
15,136,140 shares
Change Vs. Previous Month
-0.29%
Dollar Volume Sold Short
$156.50 million
Short Interest Ratio
11.9 Days to Cover
Last Record Date
July 15, 2026
Outstanding Shares
72,380,000 shares
Short Percent of Float
23.30%
Today's Trading Volume
877,712 shares
Average Trading Volume
1,612,099 shares
Today's Volume Vs. Average
54%
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Short Interest ChartDays to Cover ChartShort Percent of Float Chart

OMER Short Interest Over Time

OMER Days to Cover Over Time

OMER Percentage of Float Shorted Over Time

Omeros 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
7/15/202615,092,070 shares $156.50 million -0.3%23.3%11.85 $10.37
6/30/202615,136,140 shares $143.94 million -16.4%23.4%5.61 $9.51
6/15/202618,103,605 shares $168.91 million +11.3%27.9%8.44 $9.33
5/29/202616,271,790 shares $179.64 million +2.1%25.8%9.05 $11.04
5/15/202615,940,028 shares $195.27 million +1.0%25.3%10.84 $12.25
4/30/202615,789,527 shares $230.53 million -6.6%25.1%13.09 $14.60
4/15/202616,900,273 shares $207.03 million -1.0%26.1%11.43 $12.25
3/31/202617,069,802 shares $180.26 million -1.4%26.4%18.78 $10.56
3/13/202617,312,128 shares $193.72 million +0.1%28.0%22.18 $11.19
2/27/202617,289,620 shares $208.34 million -3.7%28.0%21.18 $12.05
2/13/202617,959,196 shares $209.94 million +1.7%27.7%17.68 $11.69
1/30/202617,661,898 shares $206.47 million +7.5%28.6%10.44 $11.69
1/15/202616,429,140 shares $200.60 million +24.0%26.6%4.67 $12.21
12/31/202513,247,185 shares $227.45 million -4.8%21.5%2.6 $17.17
12/15/202513,919,634 shares $128.06 million +4.3%22.5%9.47 $9.20
11/28/202513,350,021 shares $122.82 million 0.0%21.6%7.8 $9.20
11/14/202513,353,498 shares $105.09 million +9.9%22.5%7.79 $7.87
10/31/202512,155,081 shares $89.10 million -5.7%20.5%4.2 $7.33
10/15/202512,890,000 shares $134.31 million +1.8%21.7%3.8 $10.42
9/30/202512,660,000 shares $51.91 million -6.2%N/A11.4 $4.10
9/15/202513,500,000 shares $55.22 million +2.7%N/A11.9 $4.09
8/31/202513,140,000 shares $54.66 million -1.9%22.2%11.8 $4.16
8/15/202513,390,000 shares $59.05 million +4.8%N/A11.7 $4.41
7/31/202512,780,000 shares $49.46 million -6.0%23.8%10 $3.87
7/15/202513,600,000 shares $49.10 million +0.6%24.3%13.3 $3.61
6/30/202513,520,000 shares $40.56 million +3.2%24.2%13.1 $3.00
6/15/202513,100,000 shares $44.54 million +7.0%23.4%13.1 $3.40
5/31/202512,240,000 shares $38.07 million +14.3%21.9%12.9 $3.11
5/15/202510,710,000 shares $42.30 million +16.8%19.1%11.8 $3.95
4/30/20259,170,000 shares $67.40 million -14.4%16.5%14.8 $7.35
4/15/202510,710,000 shares $73.58 million +14.8%19.3%17.4 $6.87
3/31/20259,330,000 shares $76.69 million -1.8%16.8%15.2 $8.22
3/15/20259,500,000 shares $79.99 million +2.9%17.2%14.2 $8.42
2/28/20259,230,000 shares $77.62 million -2.3%16.7%13.1 $8.41
2/15/20259,450,000 shares $86.75 million +1.0%17.1%11.4 $9.18
1/31/20259,360,000 shares $80.68 million +1.0%16.9%8.7 $8.62
1/15/20259,270,000 shares $82.50 million +9.8%16.7%8.9 $8.90
12/31/20248,440,000 shares $83.39 million +1.8%15.3%8.6 $9.88
12/15/20248,290,000 shares $63.25 million -7.1%15.0%9.3 $7.63
11/30/20248,920,000 shares $101.24 million -16.9%16.1%12.7 $11.35
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9/15/202411,840,000 shares $46.65 million +2.3%21.4%35.8 $3.94
8/31/202411,580,000 shares $48.75 million -0.9%20.9%32.3 $4.21
8/15/202411,690,000 shares $49.62 million -5.1%21.1%31.1 $4.25
7/31/202412,320,000 shares $66.40 million -4.4%22.3%31.6 $5.39
7/15/202412,880,000 shares $57.19 million +0.4%23.3%38.6 $4.44
6/30/202412,830,000 shares $52.09 million -3.1%23.2%39.3 $4.06
6/15/202413,240,000 shares $53.75 million +1.5%23.9%37.3 $4.06
5/31/202413,050,000 shares $43.85 million -3.6%23.6%36.5 $3.36
5/15/202413,540,000 shares $56.46 million -0.2%24.4%36.6 $4.17
4/30/202413,570,000 shares $42.75 million +3.4%24.4%31 $3.15
4/15/202413,130,000 shares $44.38 million -1.2%23.6%25.7 $3.38
3/31/202413,290,000 shares $45.85 million -2.3%23.9%23.1 $3.45
3/15/202413,600,000 shares $49.64 million -1.6%22.6%21.5 $3.65
2/29/202413,820,000 shares $62.19 million -0.1%22.9%20.2 $4.50
2/15/202413,830,000 shares $67.63 million +1.0%22.9%18.5 $4.89
1/31/202413,690,000 shares $44.36 million -0.9%22.7%19.1 $3.24
1/15/202413,820,000 shares $48.78 million +6.6%23.0%18.6 $3.53
12/31/202312,960,000 shares $42.38 million +0.7%21.5%15 $3.27
12/15/202312,870,000 shares $36.55 million -0.1%21.4%15.5 $2.84
11/30/202312,880,000 shares $28.21 million +1.2%21.4%16.7 $2.19
11/15/202312,730,000 shares $19.22 million -1.0%21.2%18.8 $1.51
10/31/202312,860,000 shares $15.30 million -2.1%21.3%19.9 $1.19
10/15/202313,140,000 shares $29.83 million +1.3%21.8%20.8 $2.27
9/30/202312,970,000 shares $37.87 million +7.2%21.5%29.8 $2.92
9/15/202312,100,000 shares $37.63 million -0.1%20.1%27.5 $3.11
8/31/202312,110,000 shares $41.90 million +4.5%20.1%20.9 $3.46
8/15/202311,590,000 shares $43.23 million +1.9%19.2%18.3 $3.73
7/31/202311,370,000 shares $49.46 million -1.7%18.9%17.3 $4.35
7/15/202311,570,000 shares $59.70 million +0.4%19.2%17.1 $5.16
6/30/202311,520,000 shares $62.67 million +17.8%19.1%16.5 $5.44
6/15/20239,780,000 shares $58.39 million +6.4%16.2%14.4 $5.97
5/31/20239,190,000 shares $56.98 million +1.2%15.2%18.1 $6.20
5/15/20239,080,000 shares $48.94 million -3.5%15.1%19.5 $5.39
4/30/20239,410,000 shares $54.58 million +4.3%15.6%9.9 $5.80
4/15/20239,020,000 shares $57.28 million +1.1%14.9%9.7 $6.35
3/31/20238,920,000 shares $41.48 million +5.7%14.8%10 $4.65
3/15/20238,440,000 shares $31.73 million +8.8%14.0%8.6 $3.76
2/28/20237,760,000 shares $29.26 million +4.0%12.9%7.7 $3.77
2/15/20237,460,000 shares $34.76 million -13.0%12.4%7 $4.66
1/31/20238,570,000 shares $24.85 million +0.6%14.2%8.1 $2.90
1/15/20238,520,000 shares $24.71 million -2.6%14.1%16.2 $2.90
12/30/20228,750,000 shares $19.78 million +1.6%14.6%16.8 $2.26
12/15/20228,610,000 shares $16.88 million -6.4%14.3%17.2 $1.96
11/30/20229,200,000 shares $19.69 million +4.1%15.3%21.1 $2.14
11/15/20228,840,000 shares $23.78 million -2.0%14.7%20 $2.69
10/31/20229,020,000 shares $29.86 million -2.8%15.0%18.5 $3.31
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10/15/20229,280,000 shares $31.64 million -1.5%15.4%16.7 $3.41
9/30/20229,420,000 shares $29.67 million -0.6%15.7%15 $3.15
9/15/20229,480,000 shares $37.83 million -4.8%15.8%8.2 $3.99
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6/30/202212,400,000 shares $34.10 million -6.7%20.6%8.4 $2.75
6/15/202213,290,000 shares $27.24 million +1.5%22.1%12.4 $2.05
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OMER Short Interest - Frequently Asked Questions

Short interest is the volume of Omeros shares that have been sold short but have not yet been covered or closed out. As of July 15th, investors have sold 15,092,070 shares of OMER short. 23.30% of Omeros' shares are currently sold short. Learn More on Omeros' 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. OMER shares currently have a short interest ratio of 11.9. Learn More on Omeros'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. 23.30% of Omeros' floating shares are currently sold short.

Omeros saw a decrease in short interest during the month of July. As of July 15th, there was short interest totaling 15,092,070 shares, a decrease of 0.3% from the previous total of 15,136,140 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.

23.30% of Omeros' shares are currently sold short. Here is how the short interest of companies in the sector of "medical" compare to Omeros: Supernus Pharmaceuticals, Inc. (9.13%), Nektar Therapeutics (20.70%), Perrigo Company plc (16.64%), Pacira BioSciences, Inc. (18.91%), Assembly Biosciences, Inc. (15.08%), Eli Lilly and Company (1.09%), Johnson & Johnson (1.14%), AbbVie Inc. (1.28%), Merck & Co., Inc. (1.19%), Pfizer Inc. (2.89%),

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 OMER is an investing strategy that aims to generate trading profit from Omeros as its price is falling. OMER shares are trading up $0.23 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 Omeros 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 OMER, 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 OMER, 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 OMER:

  • 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:OMER) was last updated on 7/24/2026 by MarketBeat.com Staff.
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