ProPhase Labs (PRPH) Short Interest Ratio & Short Volume $0.33 -0.01 (-2.56%) Closing price 06/13/2025 03:59 PM EasternExtended Trading$0.33 0.00 (-0.69%) As of 06/13/2025 07:50 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 AnalysisChartCompetitorsEarningsHeadlinesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock ProPhase Labs Short Interest DataProPhase Labs (PRPH) has a short interest of 323,100 shares, representing 1.71% of the float (the number of shares available for trading by the public). This marks a 40.11% increase in short interest from the previous month. The short interest ratio (days to cover) is 0.2, indicating that it would take 0.2 days of the average trading volume of 2.83 million shares to cover all short positions.Current Short Interest323,100 sharesPrevious Short Interest230,600 sharesChange Vs. Previous Month+40.11%Dollar Volume Sold Short$122.42 thousandShort Interest Ratio0.2 Days to CoverLast Record DateMay 31, 2025Outstanding Shares41,541,000 sharesShort Percent of Float1.71%Today's Trading Volume517,492 sharesAverage Trading Volume2,831,818 sharesToday's Volume Vs. Average18% Short Selling ProPhase Labs? Sign up to receive the latest short interest report for ProPhase Labs and its competitors with MarketBeat's FREE newsletter. Email Address Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartPRPH Short Interest Over TimePRPH Days to Cover Over TimePRPH Percentage of Float Shorted Over Time ProPhase Labs Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 5/31/2025323,100 shares $122.42 thousand +40.1%1.7%0.2 $0.38 5/15/2025230,600 shares $91.04 thousand -49.6%1.2%0.1 $0.39 4/30/2025457,100 shares $159.07 thousand -64.3%N/A0 $0.35 4/15/20251,280,000 shares $368.51 thousand +7.6%6.8%0.1 $0.29 3/31/20251,190,000 shares $481.12 thousand +50.0%6.3%0.1 $0.40 3/15/2025793,400 shares $311.49 thousand -52.2%4.2%0.1 $0.39 2/28/20251,660,000 shares $745.01 thousand -62.4%8.8%0.2 $0.45 2/15/20254,420,000 shares $1.44 million +5,106.1%23.3%0.5 $0.33 1/31/202584,900 shares $22.35 thousand -27.1%N/A0.1 $0.26 1/15/2025116,400 shares $69.85 thousand +19.1%N/A0.4 $0.60 Get the Latest News and Ratings for PRPH and Related StocksEnter your email address below to receive the latest news and analysts' ratings for ProPhase Labs and its competitors with MarketBeat's FREE daily newsletter. 12/31/202497,700 shares $73.97 thousand -10.5%N/A0.4 $0.76 12/15/2024109,200 shares $71.09 thousand -24.6%N/A0.6 $0.65 11/30/2024144,900 shares $111.57 thousand -41.0%N/A1 $0.77 11/15/2024245,700 shares $184.28 thousand +59.4%N/A2.1 $0.75 10/31/2024154,100 shares $352.89 thousand -25.2%N/A1.9 $2.29 10/15/2024206,100 shares $471.97 thousand -10.8%N/A7.1 $2.29 9/30/2024231,000 shares $559.02 thousand -9.9%N/A7.7 $2.42 9/15/2024256,300 shares $627.94 thousand +3.0%N/A8.1 $2.45 8/31/2024248,900 shares $669.54 thousand -9.9%N/A8.4 $2.69 8/15/2024276,300 shares $624.44 thousand -13.3%N/A8.5 $2.26 7/31/2024318,500 shares $974.61 thousand +0.7%N/A9.4 $3.06 7/15/2024316,400 shares $1.02 million -1.8%N/A8.6 $3.22 6/30/2024322,300 shares $1.35 million +0.5%N/A5.4 $4.18 6/15/2024320,800 shares $1.47 million +2.1%N/A5.3 $4.59 5/31/2024314,200 shares $1.62 million +20.8%N/A5.2 $5.15 5/15/2024260,100 shares $1.34 million -1.9%N/A4.3 $5.14 4/30/2024265,100 shares $1.22 million -3.5%1.9%5 $4.61 4/15/2024274,700 shares $1.69 million +6.8%2.0%5.5 $6.16 3/31/2024257,300 shares $1.66 million +3.7%1.8%9.6 $6.47 3/15/2024248,200 shares $1.25 million -16.9%1.8%9.5 $5.04 2/29/2024298,500 shares $1.33 million +0.7%2.1%11.2 $4.47 2/15/2024296,400 shares $1.47 million -0.2%2.1%12.1 $4.96 1/31/2024297,000 shares $1.44 million +4.7%2.1%11.2 $4.85 1/15/2024283,600 shares $1.39 million -7.3%2.0%10.9 $4.90 12/31/2023306,000 shares $1.38 million -5.1%2.2%12.2 $4.52 12/15/2023322,400 shares $1.45 million -20.2%2.3%13.1 $4.50 11/30/2023404,000 shares $2.05 million +45.5%2.9%15.2 $5.07 11/15/2023277,700 shares $1.21 million -5.3%2.0%8.8 $4.35 10/31/2023293,100 shares $1.29 million -1.9%2.3%7.9 $4.39 10/15/2023298,800 shares $1.31 million -3.9%2.3%7.7 $4.37An AI run of epic proportions is only getting started (Ad)I just put together an urgent new presentation that you need to see right away. 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Click to find out what Nvidia’s CEO might reveal… and how Sykes is preparing to ride the wave. 9/30/2023311,000 shares $1.36 million +0.2%2.4%7.5 $4.37 9/15/2023310,300 shares $1.41 million -13.8%2.4%7.1 $4.56 8/31/2023360,100 shares $1.54 million +0.5%2.8%7.1 $4.28 8/15/2023358,300 shares $2.04 million +0.3%2.8%6.3 $5.70 7/31/2023357,200 shares $2.60 million +8.9%2.7%5.9 $7.28 7/15/2023327,900 shares $2.33 million +1.1%2.5%4.5 $7.11 6/30/2023324,400 shares $2.36 million +1.8%2.5%4.3 $7.26 6/15/2023318,700 shares $2.38 million -8.1%2.4%4.1 $7.47 5/31/2023346,700 shares $3.29 million +2.5%2.6%4.7 $9.49 5/15/2023338,400 shares $2.72 million -4.1%2.6%5.6 $8.04 4/30/2023352,700 shares $2.65 million -7.9%2.7%6.8 $7.50 4/15/2023382,800 shares $3.12 million +23.5%2.9%8.5 $8.16 3/31/2023309,900 shares $2.36 million +17.9%2.4%6.6 $7.62 3/15/2023262,900 shares $2.12 million -10.0%2.2%5.2 $8.06 2/28/2023292,000 shares $2.13 million -3.3%2.4%5.9 $7.31 2/15/2023301,900 shares $2.42 million -6.0%2.5%5.6 $8.01 1/31/2023321,200 shares $2.63 million -8.7%2.6%4.9 $8.18 1/15/2023351,700 shares $3.29 million -5.8%2.8%5 $9.36 12/30/2022373,300 shares $3.59 million -9.6%2.9%4.8 $9.63 12/15/2022412,700 shares $4.20 million +10.1%3.2%5.1 $10.18 11/30/2022375,000 shares $3.89 million -11.9%3.0%4.3 $10.37 11/15/2022425,800 shares $5.03 million +16.2%3.4%4.5 $11.81 10/31/2022366,400 shares $4.42 million -21.1%2.9%3.5 $12.05 10/15/2022464,400 shares $4.83 million +13.9%3.7%4 $10.41 9/30/2022407,700 shares $4.60 million +28.9%3.2%2.7 $11.28 9/15/2022316,300 shares $3.38 million -4.2%2.5%1.8 $10.68 8/31/2022330,300 shares $4.00 million -9.8%2.6%1.8 $12.11 8/15/2022366,300 shares $4.47 million +31.6%3.0%1.9 $12.19 7/31/2022278,300 shares $2.88 million -2.7%3.3%1.7 $10.34 7/15/2022286,000 shares $4.00 million +22.8%3.4%1.9 $13.98 6/30/2022232,900 shares $2.95 million +61.4%2.8%2.2 $12.68 6/15/2022144,300 shares $1.53 million +65.3%1.7%2 $10.61 5/31/202287,300 shares $790.07 thousand -1.0%0.7%1.7 $9.05 5/15/202288,200 shares $620.05 thousand +2.3%0.7%2.7 $7.03 4/30/202286,200 shares $639.60 thousand +21.4%0.7%3.2 $7.42 4/15/202271,000 shares $590.01 thousand -31.2%0.6%2.8 $8.31 3/31/2022103,200 shares $722.40 thousand +1.7%0.8%4.5 $7.00 3/15/2022101,500 shares $652.65 thousand -1.4%0.8%5 $6.43 2/28/2022102,900 shares $650.33 thousand +12.2%0.8%3.7 $6.32 2/15/202291,700 shares $633.65 thousand -19.8%0.7%2.6 $6.91 1/31/2022114,300 shares $827.53 thousand +13.5%0.9%3 $7.24 1/15/2022100,700 shares $735.11 thousand -20.1%0.8%2.4 $7.30 12/31/2021126,000 shares $903.42 thousand +17.4%1.0%2.5 $7.17 12/15/2021107,300 shares $743.59 thousand -29.8%0.8%2.1 $6.93 11/30/2021152,800 shares $959.58 thousand -10.2%1.2%2.9 $6.28 11/15/2021170,100 shares $1.02 million -10.1%1.3%3.6 $6.00 10/29/2021189,100 shares $1.11 million -9.6%1.5%2.8 $5.89 10/15/2021209,100 shares $1.19 million -13.3%1.7%2.3 $5.70 9/30/2021241,300 shares $1.25 million -7.0%1.9%2.3 $5.20 9/15/2021259,500 shares $1.28 million -14.1%2.1%1.5 $4.95An AI run of epic proportions is only getting started (Ad)I just put together an urgent new presentation that you need to see right away. 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Click to find out what Nvidia’s CEO might reveal… and how Sykes is preparing to ride the wave. 8/31/2021302,100 shares $1.62 million -5.6%2.4%0.9 $5.36 8/13/2021320,000 shares $2.07 million -17.6%2.6%0.9 $6.46 7/30/2021388,500 shares $2.78 million -7.0%3.1%1.1 $7.16 7/15/2021417,900 shares $2.57 million -9.0%3.4%1.3 $6.15 6/30/2021459,100 shares $2.85 million +42.2%3.7%1.3 $6.20 6/15/2021322,800 shares $1.90 million +69.6%2.6%0.8 $5.90 5/28/2021190,300 shares $913.44 thousand -12.3%1.5%0.5 $4.80 5/14/2021217,000 shares $1.21 million +17.5%1.7%0.8 $5.56 4/30/2021184,700 shares $971.52 thousand +39.8%1.5%0.7 $5.26 4/15/2021132,100 shares $696.17 thousand -24.2%1.1%0.4 $5.27 3/31/2021174,300 shares $1.09 million +42.8%1.4%0.5 $6.27 3/15/2021122,100 shares $880.34 thousand +62.8%1.0%0.6 $7.21 2/26/202175,000 shares $579 thousand -24.8%0.6%0.4 $7.72 2/12/202199,700 shares $1.04 million -11.0%0.8%0.6 $10.41 1/29/2021112,000 shares $1.09 million +31.0%1.0%0.7 $9.76 1/15/202185,500 shares $1.37 million No Change0.7%0.5 $15.99 PRPH Short Interest - Frequently Asked Questions What is ProPhase Labs' current short interest? Short interest is the volume of ProPhase Labs shares that have been sold short but have not yet been closed out or covered. As of May 31st, traders have sold 323,100 shares of PRPH short. 1.71% of ProPhase Labs' shares are currently sold short. Learn More on ProPhase Labs' current short interest. Which institutional investors are shorting ProPhase Labs? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of ProPhase Labs: Simplex Trading LLC. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. What is a good short interest percentage for ProPhase Labs? 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. 1.71% of ProPhase Labs' floating shares are currently sold short. Is ProPhase Labs' short interest increasing or decreasing? ProPhase Labs saw a increase in short interest in the month of May. As of May 31st, there was short interest totaling 323,100 shares, an increase of 40.1% from the previous total of 230,600 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. How does ProPhase Labs' short interest compare to its competitors? 1.71% of ProPhase Labs' shares are currently sold short. Here is how the short interest of companies in the industry of "pharmaceutical products" compare to ProPhase Labs: Clearside Biomedical, Inc. (0.18%), Telomir Pharmaceuticals, Inc. (13.28%), Precision BioSciences, Inc. (19.23%), ImmuCell Co. (0.10%), Gain Therapeutics, Inc. (1.02%), InflaRx (2.26%), Shattuck Labs, Inc. (4.16%), Verrica Pharmaceuticals Inc. (8.67%), NRx Pharmaceuticals, Inc. (7.74%), Applied Therapeutics, Inc. (16.93%), 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 ($64.96 billion), Invesco QQQ ($27.88 billion), iShares Russell 2000 ETF ($19.94 billion), iShares 20+ Year Treasury Bond ETF ($9.69 billion), Strategy Incorporated ($8.58 billion), SPDR S&P Biotech ETF ($5.72 billion), Invesco S&P 500 Equal Weight ETF ($5.45 billion), iShares iBoxx $ Investment Grade Corporate Bond ETF ($4.70 billion), Charter Communications, Inc. ($4.54 billion), and Industrial Select Sector SPDR Fund ($4.49 billion). View all of the most shorted stocks. What does it mean to sell short ProPhase Labs stock? Short selling PRPH is an investing strategy that aims to generate trading profit from ProPhase Labs as its price is falling. PRPH shares are trading down $0.01 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 ProPhase Labs? A short squeeze for ProPhase Labs 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 PRPH, which in turn drives the price of the stock up even further. How often is ProPhase Labs' 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 PRPH, twice per month. The most recent reporting period available is May, 31 2025. More Short Interest Resources from MarketBeat Related Companies Clearside Biomedical Short Interest Data Telomir Pharmaceuticals Short Interest Data Precision BioSciences Short Interest Data ImmuCell Short Interest Data Gain Therapeutics Short Interest Data InflaRx Short Interest Data Shattuck Labs Short Interest Data Verrica Pharmaceuticals Short Interest Data NRx Pharmaceuticals Short Interest Data Applied Therapeutics 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:PRPH) was last updated on 6/14/2025 by MarketBeat.com Staff From Our PartnersThe Trump Dump is starting; Get out of stocks now?The first 365 days of the Trump presidency… Will be the best time to get rich in American history.Paradigm Press | SponsoredAn AI run of epic proportions is only getting startedI just put together an urgent new presentation that you need to see right away. 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