Tandem Diabetes Care (TNDM) Short Interest Ratio & Short Volume $11.05 +0.37 (+3.46%) Closing price 04:00 PM EasternExtended Trading$11.03 -0.02 (-0.19%) As of 04:24 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 ForecastsChartCompetitorsEarningsFDA EventsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestSustainabilityTrendsBuy This Stock Tandem Diabetes Care Short Interest DataTandem Diabetes Care (TNDM) has a short interest of 8.75 million shares, representing 13.20% of the float (the number of shares available for trading by the public). This marks a -13.37% decrease in short interest from the previous month. The short interest ratio (days to cover) is 4.8, indicating that it would take 4.8 days of the average trading volume of 1.73 million shares to cover all short positions.Current Short Interest8,750,000 sharesPrevious Short Interest10,100,000 sharesChange Vs. Previous Month-13.37%Dollar Volume Sold Short$136.33 millionShort Interest Ratio4.8 Days to CoverLast Record DateJuly 31, 2025Outstanding Shares67,570,000 sharesShort Percent of Float13.20%Today's Trading Volume1,737,168 sharesAverage Trading Volume1,726,419 sharesToday's Volume Vs. Average101% 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 7/31/20258,750,000 shares $136.33 million -13.4%13.2%4.8 $15.58 7/15/202510,100,000 shares $153.52 million +3.6%N/A6.2 $15.20 6/30/20259,750,000 shares $181.74 million +10.5%14.9%5.9 $18.64 6/15/20258,820,000 shares $183.10 million +12.6%13.5%5.9 $20.76 5/31/20257,830,000 shares $155.27 million +1.7%12.2%5 $19.83 5/15/20257,700,000 shares $174.79 million +11.9%12.0%4.1 $22.70 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 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. 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 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 $28.63BREAKING: The House just passed 3 pro-crypto bills! (Ad)THREE pro-crypto bills just passed the House! Now, experts believe altcoin season is officially here. Discover the under-the-radar project I believe will skyrocket as a result. 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 $21.75 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 $137.46BREAKING: The House just passed 3 pro-crypto bills! (Ad)THREE pro-crypto bills just passed the House! Now, experts believe altcoin season is officially here. Discover the under-the-radar project I believe will skyrocket as a result. 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 $107.24 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 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 closed out or covered. As of July 31st, traders have sold 8,750,000 shares of TNDM short. 13.20% of Tandem Diabetes Care's shares are currently sold 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 5.0. 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: Group One Trading LLC, Jane Street Group LLC, Walleye Capital LLC, Walleye Trading LLC, and 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 Tandem Diabetes Care? 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. 13.20% of Tandem Diabetes Care's floating shares are currently sold short. Is Tandem Diabetes Care's short interest increasing or decreasing? Tandem Diabetes Care saw a decline in short interest in the month of July. As of July 31st, there was short interest totaling 8,750,000 shares, a decline of 13.4% from the previous total of 10,100,000 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 Tandem Diabetes Care's short interest compare to its competitors? 13.20% of Tandem Diabetes Care's shares are currently sold short. Here is how the short interest of companies in the industry of "medical equipment" compare to Tandem Diabetes Care: LivaNova PLC (4.19%), Warby Parker Inc. (9.29%), Inspire Medical Systems, Inc. (8.85%), PROCEPT BioRobotics Corporation (13.46%), LeMaitre Vascular, Inc. (6.49%), Artivion, Inc. (3.03%), Liquidia Technologies, Inc. (33.60%), National Vision Holdings, Inc. (9.55%), CONMED Corporation (7.00%), Enovis Corporation (12.30%), Which stocks are the most shorted right now? As of the most recent reporting period, the following stocks had the largest short interest positions: SPDR S&P 500 ETF Trust ($70.87 billion), Invesco QQQ ($30.12 billion), iShares Russell 2000 ETF ($19.85 billion), iShares 20+ Year Treasury Bond ETF ($10.34 billion), MicroStrategy Incorporated ($8.98 billion), iShares iBoxx $ Investment Grade Corporate Bond ETF ($7.61 billion), SPDR S&P Biotech ETF ($6.81 billion), Invesco S&P 500 Equal Weight ETF ($6.14 billion), Palo Alto Networks, Inc. ($5.97 billion), and Super Micro Computer, Inc. ($5.28 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 up $0.12 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 increases 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 July, 31 2025. More Short Interest Resources from MarketBeat Related Companies LivaNova Short Interest Warby Parker Short Interest Inspire Medical Systems Short Interest PROCEPT BioRobotics Short Interest LeMaitre Vascular Short Interest Artivion Short Interest Liquidia Technologies Short Interest National Vision Short Interest CONMED Short Interest Enovis 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 8/21/2025 by MarketBeat.com Staff From Our PartnersAlex’s “Next Magnificent Seven” stocksThe original “Magnificent Seven” turned $7K into $1.18 million. 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