Omeros (OMER) Short Interest Ratio & Short Volume $3.76 +0.11 (+2.88%) As of 01:36 PM Eastern This is a fair market value price provided by Polygon.io. Learn more. Add Compare Share Share Short Interest Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFDA EventsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Omeros Short Interest DataOmeros (OMER) has a short interest of 13.52 million shares, representing 24.15% of the float (the number of shares available for trading by the public). This marks a 3.21% increase in short interest from the previous month. The short interest ratio (days to cover) is 13.1, indicating that it would take 13.1 days of the average trading volume of 737,486 shares to cover all short positions.Current Short Interest13,520,000 sharesPrevious Short Interest13,100,000 sharesChange Vs. Previous Month+3.21%Dollar Volume Sold Short$40.56 millionShort Interest Ratio13.1 Days to CoverLast Record DateJune 30, 2025Outstanding Shares58,590,000 sharesFloat Size55,980,000 sharesShort Percent of Float24.15%Today's Trading Volume338,277 sharesAverage Trading Volume737,486 sharesToday's Volume Vs. Average46% Short Selling Omeros? Sign up to receive the latest short interest report for Omeros and its competitors with MarketBeat's FREE newsletter. Email Address Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartOMER Short Interest Over TimeOMER Days to Cover Over TimeOMER Percentage of Float Shorted Over Time Omeros Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 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 Get the Latest News and Ratings for OMER and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Omeros and its competitors with MarketBeat's FREE daily newsletter. 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 11/15/202410,730,000 shares $72.43 million -10.4%19.4%16.8 $6.75 10/31/202411,980,000 shares $48.40 million -1.2%21.6%49.9 $4.04 10/15/202412,120,000 shares $49.81 million +1.6%21.9%41.9 $4.11 9/30/202411,930,000 shares $47.36 million +0.8%21.6%36 $3.97 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 $1.51A new rule goes live in July — and the banks are quietly cashing in (Ad)A major change is quietly going into effect this July — and Wall Street is already positioning for it. Big Banks have found a way to use a new asset as if it were cash. Not stocks. Not bonds. Not even the U.S. dollar. They now trust this asset more than the traditional financial system itself.To help you get started, we're giving away a FREE Wealth Protection Guide that shows you exactly how 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 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 8/31/20229,960,000 shares $40.14 million -3.8%16.6%7.7 $4.03 8/15/202210,350,000 shares $69.76 million -10.9%17.2%7.2 $6.74 7/31/202211,620,000 shares $57.87 million -4.2%19.3%7.9 $4.98 7/15/202212,130,000 shares $49.13 million -2.2%20.2%8.2 $4.05 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 5/31/202213,090,000 shares $32.46 million +7.0%21.8%16.1 $2.48 5/15/202212,230,000 shares $39.14 million +8.5%20.3%17.5 $3.20 4/30/202211,270,000 shares $39.11 million +1.1%18.7%18.8 $3.47 4/15/202211,150,000 shares $57.31 million -0.5%18.5%18.9 $5.14 3/31/202211,200,000 shares $67.31 million -2.4%18.6%19 $6.01 3/15/202211,470,000 shares $66.64 million +0.4%19.1%17.9 $5.81 2/28/202211,420,000 shares $82.22 million -3.1%19.0%16.4 $7.20 2/15/202211,780,000 shares $81.40 million +4.1%19.7%11.9 $6.91 1/31/202211,320,000 shares $67.92 million +3.4%18.9%10.8 $6.00 1/15/202210,950,000 shares $63.18 million +0.2%18.3%10.3 $5.77 12/31/202110,930,000 shares $70.28 million -0.7%18.2%8.3 $6.43 12/15/202111,010,000 shares $80.37 million -6.4%18.4%6.8 $7.30 11/30/202111,760,000 shares $84.67 million +2.4%19.6%7.5 $7.20 11/15/202111,480,000 shares $95.17 million -2.3%19.2%9.6 $8.29 10/29/202111,750,000 shares $73.67 million +3.7%19.6%10.3 $6.27 10/15/202111,330,000 shares $87.58 million +14.7%18.9%10.4 $7.73A new rule goes live in July — and the banks are quietly cashing in (Ad)A major change is quietly going into effect this July — and Wall Street is already positioning for it. Big Banks have found a way to use a new asset as if it were cash. Not stocks. Not bonds. Not even the U.S. dollar. They now trust this asset more than the traditional financial system itself.To help you get started, we're giving away a FREE Wealth Protection Guide that shows you exactly how 9/30/20219,880,000 shares $136.25 million -4.8%16.5%13.1 $13.79 9/15/202110,380,000 shares $161.41 million -3.4%17.3%25.8 $15.55 8/31/202110,740,000 shares $175.06 million -4.3%17.9%25.9 $16.30 8/13/202111,220,000 shares $172.00 million +1.8%18.7%25.7 $15.33 7/30/202111,020,000 shares $159.79 million -2.7%18.4%20.8 $14.50 7/15/202111,330,000 shares $156.69 million -4.9%19.0%21 $13.83 6/30/202111,910,000 shares $176.74 million -2.5%19.9%21 $14.84 6/15/202112,220,000 shares $182.08 million +0.4%20.5%21 $14.90 5/28/202112,170,000 shares $184.86 million -8.8%20.4%20.9 $15.19 5/14/202113,350,000 shares $244.71 million +0.8%N/A20.5 $18.33 4/30/202113,250,000 shares $237.31 million -4.9%N/A22.1 $17.91 4/15/202113,930,000 shares $244.61 million +6.3%N/A20.8 $17.56 3/31/202113,100,000 shares $232.66 million -0.8%N/A17.2 $17.76 3/15/202113,200,000 shares $262.42 million +5.2%N/A16.8 $19.88 2/26/202112,550,000 shares $241.46 million -1.7%N/A13.9 $19.24 2/12/202112,760,000 shares $277.27 million +2.9%N/A14.7 $21.73 1/29/202112,400,000 shares $240.93 million +0.3%N/A13.6 $19.43 1/15/202112,360,000 shares $222.36 million -1.1%N/A14.4 $17.99 12/31/202012,500,000 shares $181.75 million +0.6%N/A16 $14.54 12/15/202012,430,000 shares $188.81 million +5.5%N/A14.5 $15.19 11/30/202011,780,000 shares $138.30 million -3.1%N/A12.5 $11.74 11/15/202012,160,000 shares $141.30 million -2.0%N/A12.2 $11.62 10/30/202012,410,000 shares $130.31 million -1.4%N/A9.9 $10.50 10/15/202012,590,000 shares $135.47 million +1.9%N/A7.9 $10.76 9/30/202012,360,000 shares $124.90 million -1.4%N/A8 $10.11 9/15/202012,540,000 shares $153.87 million -2.3%N/A8.6 $12.27 8/31/202012,840,000 shares $153.44 million +17.5%N/A9.7 $11.95 8/14/202010,930,000 shares $148.21 million +10.4%N/A10.1 $13.56 7/31/20209,900,000 shares $127.02 million -3.6%N/A12.7 $12.83 7/15/202010,270,000 shares $146.66 million -6.0%N/A24.4 $14.28 OMER Short Interest - Frequently Asked Questions What is Omeros' current short interest? Short interest is the volume of Omeros shares that have been sold short but have not yet been closed out or covered. As of June 30th, traders have sold 13,520,000 shares of OMER short. 24.15% of Omeros' shares are currently sold short. Learn More on Omeros' current short interest. What is a good short interest ratio for Omeros? 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 13.0. Learn More on Omeros's short interest ratio. Which institutional investors are shorting Omeros? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Omeros: Jane Street Group LLC, First Sabrepoint Capital Management LP, Sculptor Capital LP, Walleye Trading LLC, Walleye Capital LLC, Simplex Trading LLC, and Jefferies Financial Group Inc.. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. What is a good short interest percentage for Omeros? 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. 24.15% of Omeros' floating shares are currently sold short. Is Omeros' short interest increasing or decreasing? Omeros saw a increase in short interest in the month of June. As of June 30th, there was short interest totaling 13,520,000 shares, an increase of 3.2% from the previous total of 13,100,000 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. What is Omeros' float size? Omeros currently has issued a total of 58,590,000 shares. Some of Omeros' outstanding shares are available for trading, while others are subject to various restrictions. The public float, also referred to as floating shares or "the float", are shares that publicly owned, unrestricted and available to trade on the open market. Omeros currently has a public float of 55,980,000 shares. How does Omeros' short interest compare to its competitors? 24.15% of Omeros' shares are currently sold short. Here is how the short interest of companies in the sector of "medical" compare to Omeros: Nektar Therapeutics (9.60%), Assembly Biosciences, Inc. (0.76%), Cumberland Pharmaceuticals Inc. (0.10%), Eli Lilly and Company (0.91%), Johnson & Johnson (0.66%), AbbVie Inc. (0.91%), Merck & Co., Inc. (1.40%), Pfizer Inc. (1.97%), Bristol Myers Squibb Company (1.94%), Zoetis Inc. (0.00%), 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 ($72.10 billion), Invesco QQQ ($26.89 billion), iShares Russell 2000 ETF ($19.61 billion), MicroStrategy Incorporated ($9.52 billion), iShares 20+ Year Treasury Bond ETF ($8.70 billion), WD-40 Company ($7.66 billion), Technology Select Sector SPDR Fund ($6.10 billion), Invesco S&P 500 Equal Weight ETF ($5.80 billion), Invesco S&P 500 Top 50 ETF ($5.53 billion), and Vanguard Large-Cap ETF ($5.35 billion). View all of the most shorted stocks. What does it mean to sell short Omeros stock? 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 $0.11 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. How does a short squeeze work against Omeros? 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. How often is Omeros' 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 OMER, twice per month. The most recent reporting period available is June, 30 2025. More Short Interest Resources from MarketBeat Related Companies NKTR Short Interest Data ASMB Short Interest Data CPIX Short Interest Data LLY Short Interest Data JNJ Short Interest Data ABBV Short Interest Data MRK Short Interest Data PFE Short Interest Data BMY Short Interest Data ZTS Short Interest Data Short Interest Tools Stocks to Short Largest Short Interest Positions Short Interest Increases Short Interest Decreases Short Interest Reporting Dates This page (NASDAQ:OMER) was last updated on 7/14/2025 by MarketBeat.com Staff From Our PartnersYour Bank Account Is No Longer SafeWhat If Washington Declared That: YOUR Money ISN'T Actually Yours? 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