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Tandem Diabetes Care (TNDM) Short Interest Ratio & Short Volume

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$17.71 -0.39 (-2.15%)
As of 12:42 PM Eastern
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Tandem Diabetes Care Short Interest Overview

As of June 30, 2026, Tandem Diabetes Care (TNDM) had a short interest of 12.73 million shares sold short, representing 18.98% of the public float. This marks a 17.29% increase in short interest since the prior report. The short interest ratio (days to cover) is 5.6, meaning it would take 5.6 days of the average trading volume of 2.14 million shares to cover all short positions.

Current Short Interest
12,731,073 shares
Previous Short Interest
10,854,250 shares
Change Vs. Previous Month
17.29%
Dollar Volume Sold Short
$192.11 million
Short Interest Ratio
5.6 Days to Cover
Last Record Date
June 30, 2026
Outstanding Shares
68,530,000 shares
Short Percent of Float
18.98%
Today's Trading Volume
698,881 shares
Average Trading Volume
2,135,466 shares
Today's Volume Vs. Average
33%
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Short Interest ChartDays to Cover ChartShort Percent of Float Chart

TNDM Short Interest Over Time

TNDM Days to Cover Over Time

TNDM Percentage of Float Shorted Over Time

Tandem Diabetes Care Tesla Short Interest History & Recent Changes

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Report DateTotal Shares Sold ShortDollar Volume Sold ShortChange from Previous ReportPercentage of Float ShortedDays to CoverPrice on Report Date
6/30/202612,731,073 shares $192.11 million +17.3%19.0%5.62 $15.09
6/15/202610,854,250 shares $181.92 million -7.9%16.2%4.07 $16.76
5/29/202611,788,786 shares $202.77 million +9.1%17.6%4.15 $17.20
5/15/202610,801,432 shares $138.47 million +11.1%16.1%3.35 $12.82
4/30/20269,723,853 shares $189.81 million +0.8%14.5%6.17 $19.52
4/15/20269,643,357 shares $199.23 million -8.4%14.4%6.47 $20.66
2/13/20268,960,466 shares $169.80 million +0.3%13.4%9.17 $18.95
11/14/20258,787,092 shares $163.53 million +0.2%13.2%3.09 $18.61
10/31/20258,766,366 shares $122.73 million -5.1%13.2%5.93 $14.00
10/15/20259,240,000 shares $136.29 million -0.4%13.9%4.3 $14.75
9/30/20259,280,000 shares $112.66 million +17.0%N/A4.4 $12.14
9/15/20257,930,000 shares $95.87 million +19.3%N/A3.7 $12.09
8/31/20256,650,000 shares $83.19 million +15.3%10.0%3.3 $12.51
8/15/20255,770,000 shares $62.43 million -34.1%N/A2.9 $10.82
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
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
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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 $21.75
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
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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 $107.24
7/30/20213,900,000 shares $423.81 million +15.0%6.4%7.1 $108.67

TNDM Short Interest - Frequently Asked Questions

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 June 30th, traders have sold 12,731,073 shares of TNDM short. 18.98% of Tandem Diabetes Care's shares are currently sold short. Learn More on Tandem Diabetes Care's current short interest.

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 5.6. Learn More on Tandem Diabetes Care's short interest ratio.

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. 18.98% of Tandem Diabetes Care's floating shares are currently sold short.

Tandem Diabetes Care saw a increase in short interest in the month of June. As of June 30th, there was short interest totaling 12,731,073 shares, an increase of 17.3% from the previous total of 10,854,250 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.

18.98% 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: Envista Holdings Corporation (6.11%), iRhythm Technologies (9.95%), Warby Parker Inc. (19.89%), Establishment Labs Holdings Inc. (18.00%), TransMedics Group, Inc. (24.45%), LeMaitre Vascular, Inc. (6.42%), AxoGen, Inc. (8.93%), Butterfly Network, Inc. (14.47%), NovoCure Limited (10.86%), Pulse Biosciences, Inc (15.87%),

As of the most recent reporting period, the following stocks had the largest short interest positions: SPDR S&P 500 ETF Trust ($82.01 billion), Invesco QQQ ($47.15 billion), iShares Russell 2000 ETF ($24.07 billion), Nebius Group N.V. ($16.85 billion), Western Digital Corporation ($14.29 billion), SPDR S&P Biotech ETF ($11.89 billion), VanEck Semiconductor ETF ($11.29 billion), KLA Corporation ($10.37 billion), iShares 20+ Year Treasury Bond ETF ($8.78 billion), and Lumentum Holdings Inc. ($8.29 billion). View all of the most shorted stocks.

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 $1.02 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.

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.

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 June, 30 2026.

Understanding short interest metrics can help you assess how traders are positioning around a stock like TNDM:

  • Shares Sold Short: The total number of shares that have been sold by short sellers but have not yet been covered or closed out. A high number may indicate bearish sentiment.
  • Short Float: The percentage of a company’s publicly available shares (or "float") that are sold short. A higher short float suggests a greater portion of the stock is being bet against.
  • Days to Cover (Short Interest Ratio): This estimates how many days it would take short sellers to cover their positions, based on average daily trading volume. Higher values can signal potential for a short squeeze if buying pressure increases.

These metrics are often used by traders to gauge sentiment, volatility risk, and the potential for price movements based on short covering activity.


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This page (NASDAQ:TNDM) was last updated on 7/10/2026 by MarketBeat.com Staff.
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