ProPhase Labs (PRPH) Short Interest Ratio & Short Volume $0.33 -0.03 (-9.34%) Closing price 08/1/2025 04:00 PM EasternExtended Trading$0.32 0.00 (-0.95%) As of 08/1/2025 07:42 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 144,700 shares. This marks a -86.85% decrease in short interest from the previous month. The short interest ratio (days to cover) is 0.1, indicating that it would take 0.1 days of the average trading volume of 986,704 shares to cover all short positions.Current Short Interest144,700 sharesPrevious Short Interest1,100,000 sharesChange Vs. Previous Month-86.85%Dollar Volume Sold Short$60.20 thousandShort Interest Ratio0.1 Days to CoverLast Record DateJuly 15, 2025Outstanding Shares41,541,000 sharesPercentage of Shares Shorted0.35%Today's Trading Volume785,137 sharesAverage Trading Volume986,704 sharesToday's Volume Vs. Average80% 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 7/15/2025144,700 shares $60.20 thousand -86.9%N/A0.1 $0.42 6/30/20251,100,000 shares $430.43 thousand +604.7%2.9%0.4 $0.39 6/15/2025156,100 shares $51.72 thousand -51.7%0.5%0.1 $0.33 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 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. 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 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 $5.07China just unlocked Nvidia’s AI chips—what that means for you (Ad)Tired of Missing Big AI Moves Like Nvidia? 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Results proven.Watch the system in action. 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 $4.37 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 $5.89China just unlocked Nvidia’s AI chips—what that means for you (Ad)Tired of Missing Big AI Moves Like Nvidia? 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Results proven.Watch the system in action. 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 $4.95 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 July 15th, traders have sold 144,700 shares of PRPH 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. Is ProPhase Labs' short interest increasing or decreasing? ProPhase Labs saw a decline in short interest in the month of July. As of July 15th, there was short interest totaling 144,700 shares, a decline of 86.8% from the previous total of 1,100,000 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. How does ProPhase Labs' short interest compare to its competitors? Here is how the short interest of companies in the industry of "pharmaceutical products" compare to ProPhase Labs: Barinthus Biotherapeutics PLC Sponsored ADR (0.08%), MediciNova, Inc. (0.27%), ImmuCell Corporation (0.33%), PyroGenesis Canada Inc. (0.07%), Atara Biotherapeutics, Inc. (7.02%), InflaRx N.V. (1.47%), Adverum Biotechnologies, Inc. (7.45%), INmune Bio, Inc. (23.45%), ABVC BioPharma, Inc. (3.64%), Aligos Therapeutics, Inc. (9.29%), 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 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 $0.03 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 July, 15 2025. More Short Interest Resources from MarketBeat Related Companies Barinthus Biotherapeutics Short Interest Data MediciNova Short Interest Data ImmuCell Short Interest Data PyroGenesis Canada Short Interest Data Atara Biotherapeutics Short Interest Data InflaRx Short Interest Data Adverum Biotechnologies Short Interest Data INmune Bio Short Interest Data ABVC BioPharma Short Interest Data Aligos 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 8/2/2025 by MarketBeat.com Staff From Our PartnersIs Elon's empire crumbling?The Tesla Shock Nobody Sees Coming While headlines scream "Tesla is doomed"... 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