Tandem Diabetes Care (TNDM) Short Interest Ratio & Short Volume $21.65 -1.87 (-7.95%) Closing price 05/21/2025 04:00 PM EasternExtended Trading$23.04 +1.39 (+6.42%) As of 05/21/2025 07:53 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 ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Tandem Diabetes Care Short Interest DataTandem Diabetes Care (TNDM) has a short interest of 6.88 million shares. This marks a 7.84% increase in short interest from the previous month. The short interest ratio (days to cover) is 3.8, indicating that it would take 3.8 days of the average trading volume of 1.49 million shares to cover all short positions.Current Short Interest6,880,000 sharesPrevious Short Interest6,380,000 sharesChange Vs. Previous Month+7.84%Dollar Volume Sold Short$115.93 millionShort Interest Ratio3.8 Days to CoverLast Record DateApril 30, 2025Outstanding Shares66,607,000 sharesPercentage of Shares Shorted10.33%Today's Trading Volume1,352,285 sharesAverage Trading Volume1,490,065 sharesToday's Volume Vs. Average91% Short Selling Tandem Diabetes Care? Sign up to receive the latest short interest report for Tandem Diabetes Care and its competitors with MarketBeat's FREE newsletter. Email Address Skip Charts & View Short Interest HistoryShort Interest ChartDays to Cover ChartShort Percent of Float ChartTNDM Short Interest Over TimeTNDM Days to Cover Over TimeTNDM Percentage of Float Shorted Over Time Tandem Diabetes Care Short Interest History Export to ExcelReport DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date 4/30/20256,880,000 shares $115.93 million +7.8%N/A3.8 $16.85 4/15/20256,380,000 shares $112.99 million -12.2%9.9%3.9 $17.71 3/31/20257,270,000 shares $139.29 million +3.4%11.3%4.6 $19.16 3/15/20257,030,000 shares $134.77 million -1.5%10.9%4.7 $19.17 2/28/20257,140,000 shares $158.08 million +0.9%11.1%4.8 $22.14 2/15/20257,080,000 shares $236.97 million +2.2%11.0%6.4 $33.47 1/31/20256,930,000 shares $256.83 million -3.4%N/A5.5 $37.06 1/15/20257,170,000 shares $257.76 million +1.1%N/A5.4 $35.95 12/31/20247,090,000 shares $255.38 million +17.4%N/A5.2 $36.02 12/15/20246,040,000 shares $197.27 million -12.7%N/A4.3 $32.66 Get the Latest News and Ratings for TNDM and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Tandem Diabetes Care and its competitors with MarketBeat's FREE daily newsletter. 11/30/20246,920,000 shares $211.96 million -6.2%N/A5 $30.63 11/15/20247,380,000 shares $201.77 million -12.0%N/A5.5 $27.34 10/31/20248,390,000 shares $263.19 million -7.7%N/A6.6 $31.37 10/15/20249,090,000 shares $341.87 million -9.7%N/A6.3 $37.61 9/30/202410,070,000 shares $427.07 million -3.4%N/A7.3 $42.41 9/15/202410,420,000 shares $458.17 million -0.6%N/A6.6 $43.97 8/31/202410,480,000 shares $455.88 million -0.4%N/A6.7 $43.50 8/15/202410,520,000 shares $460.99 million +3.3%N/A6.5 $43.82 7/31/202410,180,000 shares $376.46 million -7.2%N/A5.9 $36.98 7/15/202410,970,000 shares $518.88 million +15.0%N/A6.9 $47.30 6/30/20249,540,000 shares $384.37 million +8.4%N/A6 $40.29 6/15/20248,800,000 shares $398.90 million -3.6%N/A5.9 $45.33 5/31/20249,130,000 shares $467.73 million +0.9%N/A5.8 $51.23 5/15/20249,050,000 shares $428.70 million +12.8%N/A4.8 $47.37 4/30/20248,020,000 shares $294.25 million -13.2%N/A4.3 $36.69 4/15/20249,240,000 shares $294.39 million -0.8%N/A5.3 $31.86 3/31/20249,310,000 shares $329.67 million +15.2%N/A5.1 $35.41 3/15/20248,080,000 shares $231.25 million +64.9%N/A4.5 $28.62 2/29/20244,900,000 shares $130.49 million -12.0%N/A2.7 $26.63 2/15/20245,570,000 shares $135.30 million +2.6%N/A3.5 $24.29 1/31/20245,430,000 shares $123.80 million +0.6%N/A3.6 $22.80 1/15/20245,400,000 shares $138.56 million -5.6%N/A3.1 $25.66 12/31/20235,720,000 shares $169.20 million -34.2%N/A3.3 $29.58 12/15/20238,690,000 shares $248.79 million +3.7%N/A5.1 $28.63 11/30/20238,380,000 shares $169.61 million +4.9%N/A5 $20.24 11/15/20237,990,000 shares $145.46 million -8.2%N/A4.9 $18.21 10/31/20238,700,000 shares $150.51 million -0.9%N/A5.6 $17.30 10/15/20238,780,000 shares $154.00 million +5.8%N/A6.2 $17.54 9/30/20238,300,000 shares $172.39 million +0.7%N/A5.6 $20.77 9/15/20238,240,000 shares $179.22 million +11.7%N/A5.8 $21.75Trump’s Exec Order #14154 could be a “Millionaire-Maker” (Ad)Former Presidential Advisor, Jim Rickards, says Trump could “rewire our economy and hand millions of Americans a chance at true financial independence in the months ahead.” We recently sat down with Rickards to capture all the key details on tape. For the moment, you can watch this interview free of charge – just click here. 8/31/20237,380,000 shares $201.92 million -11.3%N/A5.3 $27.36 8/15/20238,320,000 shares $240.28 million +10.2%N/A6.1 $28.88 7/31/20237,550,000 shares $263.65 million +0.3%N/A5.3 $34.92 7/15/20237,530,000 shares $226.88 million +4.6%N/A5.5 $30.13 6/30/20237,200,000 shares $176.69 million +11.5%N/A5.8 $24.54 6/15/20236,460,000 shares $175.78 million +7.7%N/A5.5 $27.21 5/31/20236,000,000 shares $155.94 million -4.3%N/A4.5 $25.99 5/15/20236,270,000 shares $201.46 million +0.5%N/A4.6 $32.13 4/30/20236,240,000 shares $246.98 million -15.0%N/A4.8 $39.58 4/15/20237,340,000 shares $304.54 million -3.7%N/A6.2 $41.49 3/31/20237,620,000 shares $309.45 million +12.2%N/A6.2 $40.61 3/15/20236,790,000 shares $286.13 million +8.0%N/A5.6 $42.14 2/28/20236,290,000 shares $225.56 million +7.2%N/A6.2 $35.86 2/15/20235,870,000 shares $253.06 million +8.7%N/A5.9 $43.11 1/31/20235,400,000 shares $220.00 million +3.7%N/A5.4 $40.74 1/15/20235,210,000 shares $214.91 million -2.1%N/A4.5 $41.25 12/30/20225,320,000 shares $239.13 million +4.1%N/A4.6 $44.95 12/15/20225,110,000 shares $206.55 million -5.9%N/A4.4 $40.42 11/30/20225,430,000 shares $228.33 million -3.4%N/A4.1 $42.05 11/15/20225,620,000 shares $237.56 million -6.0%N/A4.4 $42.27 10/31/20225,980,000 shares $335.78 million +7.0%N/A4.6 $56.15 10/15/20225,590,000 shares $286.10 million +5.3%N/A4.9 $51.18 9/30/20225,310,000 shares $254.08 million +17.5%N/A4.7 $47.85 9/15/20224,520,000 shares $265.10 million +7.1%N/A4.2 $58.65 8/31/20224,220,000 shares $193.02 million +6.0%N/A4.2 $45.74 8/15/20223,980,000 shares $219.90 million -10.6%N/A3.9 $55.25 7/31/20224,450,000 shares $294.63 million -1.1%N/A4.5 $66.21 7/15/20224,500,000 shares $243.14 million +12.5%8.6%4.8 $54.03 6/30/20224,000,000 shares $236.76 million +2.6%7.7%4.5 $59.19 6/15/20223,900,000 shares $222.96 million +18.2%7.5%4.7 $57.17 5/31/20223,300,000 shares $224.96 million +5.1%N/A4.3 $68.17 5/15/20223,140,000 shares $231.89 million -11.1%N/A4.9 $73.85 4/30/20223,530,000 shares $340.57 million +0.6%N/A6 $96.48 4/15/20223,510,000 shares $404.77 million +4.5%N/A6.3 $115.32 3/31/20223,360,000 shares $390.73 million -8.2%N/A5.5 $116.29 3/15/20223,660,000 shares $375.00 million +0.8%N/A5.9 $102.46 2/28/20223,630,000 shares $408.85 million -5.2%N/A5.3 $112.63 2/15/20223,830,000 shares $450.98 million +0.3%N/A5.5 $117.75 1/31/20223,820,000 shares $451.18 million -3.3%N/A6.1 $118.11 1/15/20223,950,000 shares $477.00 million -5.1%N/A6.4 $120.76 12/31/20214,160,000 shares $626.16 million +1.7%N/A7.1 $150.52 12/15/20214,090,000 shares $590.35 million -5.5%N/A6.8 $144.34 11/30/20214,330,000 shares $556.49 million +1.2%N/A6 $128.52 11/15/20214,280,000 shares $588.33 million -0.9%N/A5.9 $137.46 10/29/20214,320,000 shares $588.95 million -12.7%N/A5.9 $136.33 10/15/20214,950,000 shares $620.48 million +8.8%8.0%6.7 $125.35 9/30/20214,550,000 shares $543.18 million +23.0%7.4%6.2 $119.38 9/15/20213,700,000 shares $456.43 million -2.1%6.0%5.1 $123.36 8/31/20213,780,000 shares $424.00 million -2.8%6.1%6.9 $112.17 8/13/20213,890,000 shares $417.16 million -0.3%6.3%7.9 $107.24Trump’s Exec Order #14154 could be a “Millionaire-Maker” (Ad)Former Presidential Advisor, Jim Rickards, says Trump could “rewire our economy and hand millions of Americans a chance at true financial independence in the months ahead.” We recently sat down with Rickards to capture all the key details on tape. For the moment, you can watch this interview free of charge – just click here. 7/30/20213,900,000 shares $423.81 million +15.0%6.4%7.1 $108.67 7/15/20213,390,000 shares $320.39 million -3.7%5.6%6 $94.51 6/30/20213,520,000 shares $342.85 million -0.6%5.8%6.2 $97.40 6/15/20213,540,000 shares $322.95 million -4.8%5.8%5.4 $91.23 5/28/20213,720,000 shares $317.65 million -4.6%6.1%5.3 $85.39 5/14/20213,900,000 shares $300.30 million +11.4%N/A4.8 $77.00 4/30/20213,500,000 shares $328.93 million -7.2%N/A4.4 $93.98 4/15/20213,770,000 shares $325.43 million +7.4%N/A4.9 $86.32 3/31/20213,510,000 shares $298.28 million +5.4%N/A4.5 $84.98 3/15/20213,330,000 shares $294.17 million -12.4%N/A4.3 $88.34 2/26/20213,800,000 shares $360.96 million -1.6%N/A4.8 $94.99 2/12/20213,860,000 shares $397.46 million +3.8%N/A5.1 $102.97 1/29/20213,720,000 shares $345.48 million -6.8%N/A4.4 $92.87 1/15/20213,990,000 shares $364.49 million -2.0%N/A4.7 $91.35 12/31/20204,070,000 shares $388.36 million -6.7%N/A4.8 $95.42 12/15/20204,360,000 shares $405.74 million +38.9%N/A5.4 $93.06 11/30/20203,140,000 shares $284.96 million -3.7%N/A4.1 $90.75 11/15/20203,260,000 shares $324.17 million +15.6%N/A4.5 $99.44 10/30/20202,820,000 shares $316.97 million -2.8%N/A4.1 $112.40 10/15/20202,900,000 shares $352.29 million -12.4%N/A4.1 $121.48 9/30/20203,310,000 shares $375.69 million -1.8%N/A4.6 $113.50 9/15/20203,370,000 shares $370.36 million -2.9%N/A3.5 $109.90 8/31/20203,470,000 shares $391.14 million +4.5%N/A3.2 $112.72 8/14/20203,320,000 shares $320.58 million -3.8%N/A3 $96.56 7/31/20203,450,000 shares $360.39 million -2.0%N/A2.9 $104.46 7/15/20203,520,000 shares $350.13 million -7.4%6.1%2.8 $99.47 6/30/20203,800,000 shares $333.68 million -5.2%6.6%3 $87.81 6/15/20204,010,000 shares $329.86 million +2.0%7.0%3.5 $82.26 5/29/20203,930,000 shares $327.05 million -3.9%6.9%3.2 $83.22 TNDM Short Interest - Frequently Asked Questions What is Tandem Diabetes Care's current short interest? Short interest is the volume of Tandem Diabetes Care shares that have been sold short but have not yet been covered or closed out. As of April 30th, traders have sold 6,880,000 shares of TNDM short. Learn More on Tandem Diabetes Care's current short interest. What is a good short interest ratio for Tandem Diabetes Care? 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. TNDM shares currently have a short interest ratio of 4.0. Learn More on Tandem Diabetes Care's short interest ratio. Which institutional investors are shorting Tandem Diabetes Care? As of the most recent reporting period, the following institutional investors, funds, and major shareholders have reported short positions of Tandem Diabetes Care: Jane Street Group LLC, Cubist Systematic Strategies LLC, and Simplex Trading LLC. These positions are disclosed in Form 13F filings with the Securities and Exchange Commission. Is Tandem Diabetes Care's short interest increasing or decreasing? Tandem Diabetes Care saw a increase in short interest in April. As of April 30th, there was short interest totaling 6,880,000 shares, an increase of 7.8% from the previous total of 6,380,000 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 Tandem Diabetes Care's short interest compare to its competitors? Here is how the short interest of companies in the industry of "medical equipment" compare to Tandem Diabetes Care: Glaukos Co. (5.90%), Inari Medical, Inc. (4.24%), Inspire Medical Systems, Inc. (9.73%), iRhythm Technologies, Inc. (9.37%), Bausch + Lomb Co. (5.09%), TransMedics Group, Inc. (26.02%), Soleno Therapeutics, Inc. (10.40%), Envista Holdings Co. (6.47%), PROCEPT BioRobotics Co. (11.10%), LivaNova PLC (3.30%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: Spotify Technology S.A. ($4.67 billion), Charter Communications, Inc. ($4.58 billion), Capital One Financial Co. ($4.47 billion), The Kroger Co. ($2.56 billion), Reddit, Inc. ($2.23 billion), Rivian Automotive, Inc. ($2.16 billion), Live Nation Entertainment, Inc. ($1.90 billion), SoFi Technologies, Inc. ($1.85 billion), Zscaler, Inc. ($1.75 billion), and Omnicom Group Inc. ($1.75 billion). View all of the most shorted stocks. What does it mean to sell short Tandem Diabetes Care stock? Short selling TNDM is an investing strategy that aims to generate trading profit from Tandem Diabetes Care as its price is falling. TNDM shares are trading down $1.87 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 Tandem Diabetes Care? A short squeeze for Tandem Diabetes Care 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 TNDM, which in turn drives the price of the stock up even further. How often is Tandem Diabetes Care's 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 TNDM, twice per month. The most recent reporting period available is April, 30 2025. More Short Interest Resources from MarketBeat Related Companies Glaukos Short Interest Inari Medical Short Interest Inspire Medical Systems Short Interest iRhythm Technologies Short Interest Bausch + Lomb Short Interest TransMedics Group Short Interest Soleno Therapeutics Short Interest Envista Short Interest PROCEPT BioRobotics Short Interest LivaNova Short Interest Short Interest Tools Stocks to Short Largest Short Interest Positions Short Interest Increases Short Interest Decreases Short Interest Reporting Dates This page (NASDAQ:TNDM) was last updated on 5/22/2025 by MarketBeat.com Staff From Our PartnersWarning: Prepare to Be Shocked by These PayoutsThere's a strategy out there paying up to 70% on tech stocks like Amazon, Tesla, and Microsoft—stocks that don...Investors Alley | SponsoredThe 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 | SponsoredThe Prophet's Newest PredictionA storm is brewing in the markets: new tariffs, recession warnings, and panic in the headlines. 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