Regeneron Pharmaceuticals (REGN) Short Interest Ratio & Short Volume $563.00 +3.20 (+0.57%) Closing price 08/8/2025 04:00 PM EasternExtended Trading$559.60 -3.40 (-0.60%) As of 08/8/2025 07:48 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 Polygon.io. Learn more. Add Compare Share Share Short Interest Stock AnalysisAnalyst ForecastsChartCompetitorsDividendEarningsFDA EventsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Regeneron Pharmaceuticals Short Interest DataRegeneron Pharmaceuticals (REGN) has a short interest of 2.07 million shares, representing 1.99% of the float (the number of shares available for trading by the public). This marks a -8.00% decrease in short interest from the previous month. The short interest ratio (days to cover) is 1.6, indicating that it would take 1.6 days of the average trading volume of 969,491 shares to cover all short positions.Current Short Interest2,070,000 sharesPrevious Short Interest2,250,000 sharesChange Vs. Previous Month-8.00%Dollar Volume Sold Short$1.13 billionShort Interest Ratio1.6 Days to CoverLast Record DateJuly 15, 2025Outstanding Shares107,960,000 sharesFloat Size104,070,000 sharesShort Percent of Float1.99%Today's Trading Volume1,024,297 sharesAverage Trading Volume969,491 sharesToday's Volume Vs. Average106% Short Selling Regeneron Pharmaceuticals? Sign up to receive the latest short interest report for Regeneron Pharmaceuticals and its competitors with MarketBeat's FREE newsletter. Email Address Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartREGN Short Interest Over TimeREGN Days to Cover Over TimeREGN Percentage of Float Shorted Over Time Regeneron Pharmaceuticals Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 7/15/20252,070,000 shares $1.13 billion -8.0%2.0%1.6 $547.96 6/30/20252,250,000 shares $1.18 billion +10.8%2.2%1.7 $525.00 6/15/20252,030,000 shares $1.07 billion -24.8%2.0%1.5 $529.24 5/31/20252,700,000 shares $1.33 billion -3.6%2.6%2 $493.24 5/15/20252,800,000 shares $1.64 billion -3.1%2.7%2.5 $584.99 4/30/20252,890,000 shares $1.73 billion +11.2%2.8%2.7 $598.76 4/15/20252,600,000 shares $1.45 billion -6.8%2.6%2.6 $557.91 3/31/20252,790,000 shares $1.77 billion -14.2%2.8%2.8 $634.23 3/15/20253,250,000 shares $2.17 billion +26.5%3.2%3.5 $666.87 2/28/20252,570,000 shares $1.80 billion +16.8%2.5%2.8 $698.74 Get the Latest News and Ratings for REGN and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Regeneron Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. 2/15/20252,200,000 shares $1.48 billion +0.5%2.2%2.5 $673.60 1/31/20252,190,000 shares $1.47 billion +3.3%N/A2.4 $672.98 1/15/20252,120,000 shares $1.49 billion +1.0%N/A2.4 $703.43 12/31/20242,100,000 shares $1.50 billion +11.7%N/A2.6 $712.33 12/15/20241,880,000 shares $1.37 billion +4.4%N/A2.2 $731.30 11/30/20241,800,000 shares $1.35 billion +0.6%N/A2.3 $750.22 11/15/20241,790,000 shares $1.35 billion -3.2%N/A2.5 $756.81 10/31/20241,850,000 shares $1.55 billion +7.6%N/A2.9 $838.20 10/15/20241,720,000 shares $1.75 billion -0.6%N/A3 $1,016.53 9/30/20241,730,000 shares $1.82 billion -12.6%N/A3.3 $1,051.24 9/15/20241,980,000 shares $2.28 billion -5.7%N/A4.1 $1,153.35 8/31/20242,100,000 shares $2.49 billion -0.5%N/A4.6 $1,184.69 8/15/20242,110,000 shares $2.48 billion +5.0%N/A4.7 $1,175.33 7/31/20242,010,000 shares $2.17 billion +6.4%N/A4.6 $1,079.19 7/15/20241,890,000 shares $2.05 billion -7.4%N/A4.3 $1,082.11 6/30/20242,040,000 shares $2.14 billion +10.3%N/A4.5 $1,051.03 6/15/20241,850,000 shares $1.92 billion +5.7%N/A4.1 $1,036.52 5/31/20241,750,000 shares $1.72 billion +7.4%N/A4 $980.16 5/15/20241,630,000 shares $1.59 billion +3.8%N/A3.7 $978.21 4/30/20241,570,000 shares $1.40 billion +13.0%N/A3.4 $890.66 4/15/20241,390,000 shares $1.25 billion -2.1%N/A3 $898.56 3/31/20241,420,000 shares $1.37 billion +2.2%N/A3 $962.49 3/15/20241,390,000 shares $1.34 billion +2.2%N/A2.7 $964.47 2/29/20241,360,000 shares $1.31 billion -0.7%N/A2.4 $966.09 2/15/20241,370,000 shares $1.31 billion +9.6%N/A2.4 $954.73 1/31/20241,250,000 shares $1.18 billion +16.8%N/A2.2 $942.78 1/15/20241,070,000 shares $998.52 million +0.9%1.0%1.9 $933.20 12/31/20231,060,000 shares $930.99 million -13.1%1.0%2 $878.29 12/15/20231,220,000 shares $1.05 billion -0.8%1.2%2.4 $859.14 11/30/20231,230,000 shares $1.01 billion -12.1%1.2%2.7 $823.81Trump set to Boost Social Security Checks by 400%? (Ad)If you're collecting or planning to collect social security... You should see this presentation about President Trump's Executive Order #14196. Legendary investor Louis Navellier believes it could soon not only save Social Security from collapse... But BOOST benefits for millions of retirees by up to 400%. No wonder the financial times called this new initiative...Click here to see the details because the stakes couldn't be any higher. 11/15/20231,400,000 shares $1.11 billion +6.9%1.3%3.3 $792.38 10/31/20231,310,000 shares $1.02 billion -4.4%1.3%3 $779.89 10/15/20231,370,000 shares $1.15 billion +16.1%1.3%3 $839.63 9/30/20231,180,000 shares $971.09 million -18.6%1.1%2.4 $822.96 9/15/20231,450,000 shares $1.19 billion -2.0%1.4%2.5 $823.40 8/31/20231,480,000 shares $1.22 billion +8.8%1.4%2.5 $826.49 8/15/20231,360,000 shares $1.10 billion +1.5%1.3%2.1 $805.91 7/31/20231,340,000 shares $994.16 million +5.5%1.3%2.1 $741.91 7/15/20231,270,000 shares $912.52 million +17.6%N/A2 $718.52 6/30/20231,080,000 shares $776.02 million -12.2%N/A1.8 $718.54 6/15/20231,230,000 shares $963.18 million +7.9%N/A2.2 $783.07 5/31/20231,140,000 shares $838.54 million -5.8%N/A2 $735.56 5/15/20231,210,000 shares $908.66 million +2.5%N/A2.1 $750.96 4/30/20231,180,000 shares $946.11 million -2.5%1.1%2 $801.79 4/15/20231,210,000 shares $1.00 billion -6.9%1.2%2 $829.33 3/31/20231,300,000 shares $1.07 billion +7.4%1.2%2 $821.67 3/15/20231,210,000 shares $919.96 million +0.8%1.2%1.9 $760.30 2/28/20231,200,000 shares $912.50 million -10.5%1.2%1.9 $760.42 2/15/20231,340,000 shares $1.01 billion -8.2%1.3%2.1 $752.40 1/31/20231,460,000 shares $1.11 billion +3.6%1.4%2.2 $758.47 1/15/20231,410,000 shares $1.02 billion -6.0%1.4%2.2 $722.13 12/30/20221,500,000 shares $1.08 billion +4.2%1.5%2.2 $721.49 12/15/20221,440,000 shares $1.05 billion -7.1%1.4%2.1 $731.27 11/30/20221,550,000 shares $1.17 billion -11.9%1.5%2.1 $751.70 11/15/20221,760,000 shares $1.28 billion -0.6%1.7%2.3 $728.73 10/31/20221,770,000 shares $1.33 billion -16.1%1.7%2.3 $748.75 10/15/20222,110,000 shares $1.55 billion -7.5%2.1%2.8 $736.06 9/30/20222,280,000 shares $1.57 billion -3.8%2.2%3.2 $688.87 9/15/20222,370,000 shares $1.67 billion -18.6%2.3%3.5 $705.85 8/31/20222,910,000 shares $1.69 billion -0.7%2.8%4.3 $581.06 8/15/20222,930,000 shares $1.88 billion -4.6%2.9%4.6 $643.29 7/31/20223,070,000 shares $1.79 billion +7.3%3.0%4.6 $581.69 7/15/20222,860,000 shares $1.74 billion +3.3%2.8%4.3 $607.54 6/30/20222,770,000 shares $1.64 billion +7.4%N/A4.1 $591.13 6/15/20222,580,000 shares $1.45 billion +23.4%N/A3.7 $561.19 5/31/20222,090,000 shares $1.39 billion -4.1%N/A3.1 $664.74 5/15/20222,180,000 shares $1.41 billion +0.9%N/A3.4 $645.52 4/30/20222,160,000 shares $1.42 billion +0.5%N/A3.2 $659.11 4/15/20222,150,000 shares $1.58 billion -2.3%2.1%3 $733.02 3/31/20222,200,000 shares $1.54 billion -8.0%2.1%3 $698.42 3/15/20222,390,000 shares $1.59 billion +6.7%2.3%3.3 $665.93 2/28/20222,240,000 shares $1.39 billion +4.7%2.2%3 $618.36 2/15/20222,140,000 shares $1.35 billion +19.6%2.1%2.8 $630.15 1/31/20221,790,000 shares $1.09 billion -1.7%1.7%2.4 $608.59 1/15/20221,820,000 shares $1.12 billion +11.0%1.8%2.4 $615.24 12/31/20211,640,000 shares $1.04 billion +7.2%1.6%2.2 $631.52 12/15/20211,530,000 shares $1.01 billion +3.4%1.5%1.9 $657.93 11/30/20211,480,000 shares $942.06 million -8.1%1.4%2 $636.53 11/15/20211,610,000 shares $1.04 billion -14.4%1.6%2.1 $647.73 10/29/20211,880,000 shares $1.20 billion +6.8%1.8%2.3 $639.94Trump set to Boost Social Security Checks by 400%? (Ad)If you're collecting or planning to collect social security... You should see this presentation about President Trump's Executive Order #14196. Legendary investor Louis Navellier believes it could soon not only save Social Security from collapse... But BOOST benefits for millions of retirees by up to 400%. No wonder the financial times called this new initiative...Click here to see the details because the stakes couldn't be any higher. 10/15/20211,760,000 shares $973.70 million -2.2%1.7%2.2 $553.24 9/30/20211,800,000 shares $1.09 billion +14.7%1.8%2.4 $605.18 9/15/20211,570,000 shares $1.02 billion +15.4%1.5%2 $652.00 8/31/20211,360,000 shares $915.82 million -3.6%1.3%1.7 $673.40 8/13/20211,410,000 shares $880.95 million -11.3%1.4%1.8 $624.79 7/30/20211,590,000 shares $913.63 million -13.6%1.6%2.1 $574.61 7/15/20211,840,000 shares $1.08 billion +30.5%1.8%2.4 $589.32 6/30/20211,410,000 shares $787.54 million -26.6%1.4%1.8 $558.54 6/15/20211,920,000 shares $1.01 billion -9.0%1.9%2.4 $527.49 5/28/20212,110,000 shares $1.06 billion -5.4%2.1%2.6 $502.43 5/14/20212,230,000 shares $1.15 billion -4.7%2.2%2.6 $517.17 4/30/20212,340,000 shares $1.13 billion -14.9%2.3%2.5 $485.00 4/15/20212,750,000 shares $1.32 billion +24.4%2.7%2.8 $481.16 3/31/20212,210,000 shares $1.04 billion -16.9%2.2%2.1 $470.67 3/15/20212,660,000 shares $1.25 billion +14.7%2.6%2.6 $471.46 2/26/20212,320,000 shares $1.05 billion +10.0%2.3%2.2 $453.19 2/12/20212,110,000 shares $1.04 billion +8.8%2.1%2 $490.54 1/29/20211,940,000 shares $982.16 million -18.8%1.9%2 $506.27 1/15/20212,390,000 shares $1.24 billion +6.2%2.4%2.6 $517.91 12/31/20202,250,000 shares $1.08 billion +14.8%2.2%2.4 $478.30 12/15/20201,960,000 shares $980.74 million -8.0%1.9%1.9 $500.38 11/30/20202,130,000 shares $1.09 billion +6.0%2.1%2.2 $514.05 11/15/20202,010,000 shares $1.14 billion -7.4%2.0%2.1 $566.43 10/30/20202,170,000 shares $1.21 billion -6.9%2.1%2.4 $555.79 10/15/20202,330,000 shares $1.40 billion +13.7%2.3%2.7 $600.82 9/30/20202,050,000 shares $1.15 billion +28.1%2.0%2.4 $559.78 9/15/20201,600,000 shares $927.84 million +0.6%1.6%2.1 $579.90 8/31/20201,590,000 shares $985.69 million -0.6%1.6%2 $619.93 8/14/20201,600,000 shares $980.11 million -15.3%1.6%1.4 $612.57 REGN Short Interest - Frequently Asked Questions What is Regeneron Pharmaceuticals' current short interest? Short interest is the volume of Regeneron Pharmaceuticals shares that have been sold short but have not yet been covered or closed out. As of July 15th, investors have sold 2,070,000 shares of REGN short. 1.99% of Regeneron Pharmaceuticals' shares are currently sold short. Learn More on Regeneron Pharmaceuticals' current short interest. What is a good short interest ratio for Regeneron Pharmaceuticals? 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. REGN shares currently have a short interest ratio of 2.0. Learn More on Regeneron Pharmaceuticals's short interest ratio. Which institutional investors are shorting Regeneron Pharmaceuticals? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Regeneron Pharmaceuticals: Mirae Asset Securities USA Inc., Bank of Montreal Can, Allianz Asset Management GmbH, Twin Tree Management LP, IMC Chicago LLC, Union Bancaire Privee UBP SA, Covenant Asset Management LLC, Baader Bank Aktiengesellschaft, Quaker Wealth Management LLC, Jane Street Group LLC, Goldman Sachs Group Inc., Parallax Volatility Advisers L.P., Millennium Management LLC, Cubist Systematic Strategies LLC, Nomura Holdings Inc., Twin Tree Management LP, BNP Paribas Financial Markets, Eisler Capital Management Ltd., Jane Street Group LLC, Walleye Trading LLC, Walleye Capital LLC, Capital Fund Management S.A., Persistent Asset Partners Ltd, Arrowpoint Investment Partners Singapore Pte. Ltd., JPMorgan Chase & Co., and Citigroup Inc.. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. What is a good short interest percentage for Regeneron Pharmaceuticals? 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. 1.99% of Regeneron Pharmaceuticals' floating shares are currently sold short. Is Regeneron Pharmaceuticals' short interest increasing or decreasing? Regeneron Pharmaceuticals saw a decrease in short interest in the month of July. As of July 15th, there was short interest totaling 2,070,000 shares, a decrease of 8.0% from the previous total of 2,250,000 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 Regeneron Pharmaceuticals' float size? Regeneron Pharmaceuticals currently has issued a total of 107,960,000 shares. Some of Regeneron Pharmaceuticals' 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. Regeneron Pharmaceuticals currently has a public float of 104,070,000 shares. How does Regeneron Pharmaceuticals' short interest compare to its competitors? 1.99% of Regeneron Pharmaceuticals' shares are currently sold short. Here is how the short interest of companies in the sector of "medical" compare to Regeneron Pharmaceuticals: Amgen Inc. (2.74%), Gilead Sciences, Inc. (1.82%), Moderna, Inc. (19.34%), Intellia Therapeutics, Inc. (27.87%), Vir Biotechnology, Inc. (12.67%), Vertex Pharmaceuticals Incorporated (1.64%), AbbVie Inc. (0.89%), Eli Lilly and Company (0.90%), Merck & Co., Inc. (1.15%), Pfizer Inc. (1.75%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: Coinbase Global, Inc. ($5.11 billion), Charter Communications, Inc. ($4.76 billion), Reddit Inc. ($2.84 billion), SoFi Technologies, Inc. ($2.79 billion), Seagate Technology Holdings PLC ($2.79 billion), Live Nation Entertainment, Inc. ($2.67 billion), Rocket Lab Corporation ($2.49 billion), AST SpaceMobile, Inc. ($2.12 billion), Moderna, Inc. ($2.09 billion), and Omnicom Group Inc. ($2.04 billion). View all of the most shorted stocks. What does it mean to sell short Regeneron Pharmaceuticals stock? Short selling REGN is an investing strategy that aims to generate trading profit from Regeneron Pharmaceuticals as its price is falling. REGN shares are trading up $3.20 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 Regeneron Pharmaceuticals? A short squeeze for Regeneron Pharmaceuticals 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 REGN, which in turn drives the price of the stock up even further. How often is Regeneron Pharmaceuticals' 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 REGN, twice per month. The most recent reporting period available is July, 15 2025. 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