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HowShorted

How shorted is TANDEM DIABETES CARE INC? TNDM

#180most shorted US stockof 3,805 ranked stocks, more shorted than 95%

17.93%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+1.04
5 reports (~10 weeks)
−0.65
days to cover
7.89
Aggregate net short position time series for TANDEM DIABETES CARE INC

Markers along the chart's base: ▲ results announced (an 8-K reporting results was filed) ▲ quarterly or annual report filed. Dates are SEC filing dates; hover a point to see events since the previous settlement.

Days to cover

FINRA's own figure: reported shares short divided by the stock's average daily trading volume, published alongside each settlement. It expresses the short position in days of typical trading rather than as a percentage of the company; the two can move differently.

Aggregate net short position time series for TANDEM DIABETES CARE INC days to cover

Short interest around results

For each results announcement (an 8-K reporting results, by its SEC filing date), the FINRA settlement before it and the first one after. Settlements fall twice a month, so the two figures can sit up to a month apart and much else changes in between: this shows what was reported, not why.

Reported short interest before and after each results announcement
Results filedSettlement beforeSettlement afterChange
6 Aug 202616.41% 31 Jul 202615.21% 14 Aug 2026−1.20
7 May 202614.34% 30 Apr 202615.76% 15 May 2026+1.42
19 Feb 202613.22% 13 Feb 202614.40% 27 Feb 2026+1.18
6 Nov 202512.97% 31 Oct 202512.96% 14 Nov 2025−0.01
6 Aug 202513.13% 31 Jul 20258.54% 15 Aug 2025−4.59
30 Apr 20259.72% 15 Apr 202511.56% 15 May 2025+1.84
26 Feb 202510.77% 14 Feb 202510.86% 28 Feb 2025+0.09
6 Nov 202412.82% 31 Oct 202411.24% 15 Nov 2024−1.58

Fails to deliver

The SEC's fails-to-deliver figure for TNDM: the aggregate net balance of shares that failed to be delivered at each settlement date, published by the SEC twice a month and shown here verbatim for the trailing window. A balance is not a daily flow, and a fail has many ordinary causes; the SEC says it cannot guarantee the accuracy of the data. See what fails to deliver are and the largest balances today.

Last balance on file
2,362
8 Sep 2026
Highest in window
348,799
9 Oct 2025
Days with a balance
60
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for TANDEM DIABETES CARE INC fails to deliver

Source: U.S. Securities and Exchange Commission, fails-to-deliver data (public domain). Only settlement days with a positive balance appear; the largest balance in the window was 349K shares.

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Sector: Healthcare

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 202617.93%+1.04
31 Aug 202616.89%+1.68
14 Aug 202615.21%−1.20
31 Jul 202616.41%−2.73
15 Jul 202619.14%+0.56
30 Jun 202618.58%+2.74
15 Jun 202615.84%−1.36
29 May 202617.20%+1.44
15 May 202615.76%+1.42
30 Apr 202614.34%+0.12
15 Apr 202614.22%−1.31
31 Mar 202615.53%−0.03
13 Mar 202615.56%+1.16
27 Feb 202614.40%+1.18
13 Feb 202613.22%+0.04
30 Jan 202613.18%−0.10
15 Jan 202613.28%+0.68
31 Dec 202512.60%+0.54
15 Dec 202512.06%−0.85
28 Nov 202512.91%−0.05
14 Nov 202512.96%−0.01
31 Oct 202512.97%−0.70
15 Oct 202513.67%−0.06
30 Sep 202513.73%+1.99
15 Sep 202511.74%+1.89
29 Aug 20259.85%+1.31
15 Aug 20258.54%−4.59
31 Jul 202513.13%−2.03
15 Jul 202515.16%+0.52
30 Jun 202514.64%+1.39
13 Jun 202513.25%+1.49
30 May 202511.76%+0.20
15 May 202511.56%+1.23
30 Apr 202510.33%+0.61
15 Apr 20259.72%−1.36
31 Mar 202511.08%+0.38
14 Mar 202510.70%−0.16
28 Feb 202510.86%+0.09
14 Feb 202510.77%+0.22
31 Jan 202510.55%−0.37
15 Jan 202510.92%+0.13
31 Dec 202410.79%+1.60
13 Dec 20249.19%−1.35
29 Nov 202410.54%−0.70
15 Nov 202411.24%−1.58
31 Oct 202412.82%−1.07
15 Oct 202413.89%−1.50
30 Sep 202415.39%−0.53
13 Sep 202415.92%−0.10
30 Aug 202416.02%−0.05
15 Aug 202416.07%+0.52
31 Jul 202415.55%−1.43
15 Jul 202416.98%+2.20
28 Jun 202414.78%+1.15
14 Jun 202413.63%−0.51
31 May 202414.14%+0.12
15 May 202414.02%+1.61
30 Apr 202412.41%−1.77
15 Apr 202414.18%−0.10
28 Mar 202414.28%+1.89
15 Mar 202412.39%+4.87
29 Feb 20247.52%−1.03
15 Feb 20248.55%+0.23
31 Jan 20248.32%+0.04
12 Jan 20248.28%−0.50
29 Dec 20238.78%−4.55
15 Dec 202313.33%+0.47
30 Nov 202312.86%+0.61
15 Nov 202312.25%−1.10
31 Oct 202313.35%−0.15
13 Oct 202313.50%+0.75
29 Sep 202312.75%+0.09
15 Sep 202312.66%+1.33
31 Aug 202311.33%−1.46
15 Aug 202312.79%+1.19
31 Jul 202311.60%−0.06
14 Jul 202311.66%+0.51
30 Jun 202311.15%+1.16
15 Jun 20239.99%+0.71
31 May 20239.28%−0.42
15 May 20239.70%+0.04
28 Apr 20239.66%−1.75
14 Apr 202311.41%−0.43
31 Mar 202311.84%+1.27
15 Mar 202310.57%+0.79
28 Feb 20239.78%+0.64
15 Feb 20239.14%+0.75
31 Jan 20238.39%+0.29
13 Jan 20238.10%−0.18
30 Dec 20228.28%+0.34
15 Dec 20227.94%−0.50
30 Nov 20228.44%−0.30
15 Nov 20228.74%−0.56
31 Oct 20229.30%+0.60
14 Oct 20228.70%+0.43
30 Sep 20228.27%+1.24
15 Sep 20227.03%+0.45
31 Aug 20226.58%+0.39
15 Aug 20226.19%−0.73
29 Jul 20226.92%−0.11
15 Jul 20227.03%+0.78
30 Jun 20226.25%+0.15
15 Jun 20226.10%+0.93
31 May 20225.17%+0.26
13 May 20224.91%−0.61
29 Apr 20225.52%−0.01
14 Apr 20225.53%+0.24
31 Mar 20225.29%−0.47
15 Mar 20225.76%+0.05
28 Feb 20225.71%−0.32
15 Feb 20226.03%+0.02
31 Jan 20226.01%−0.20
14 Jan 20226.21%−0.34
31 Dec 20216.55%+0.11
15 Dec 20216.44%−0.38
30 Nov 20216.82%+0.08
15 Nov 20216.74%−0.06
29 Oct 20216.80%−1.06
15 Oct 20217.86%+0.64
30 Sep 20217.22%+1.35
15 Sep 20215.87%−0.13
31 Aug 20216.00%−0.17
13 Aug 20216.17%−0.02
30 Jul 20216.19%+0.78
15 Jul 20215.41%−0.22
30 Jun 20215.63%−0.02
15 Jun 20215.65%−0.28
28 May 20215.93%−0.30
14 May 20216.23%+0.65
30 Apr 20215.58%−0.47
15 Apr 20216.05%+0.40
31 Mar 20215.65%+0.30
15 Mar 20215.35%−0.75
26 Feb 20216.10%−0.11
12 Feb 20216.21%+0.23
29 Jan 20215.98%−0.44
15 Jan 20216.42%−0.12
31 Dec 20206.54%−0.48
15 Dec 20207.02%+1.97
30 Nov 20205.05%−0.20
13 Nov 20205.25%+0.72
30 Oct 20204.53%−0.23
15 Oct 20204.76%−0.67
30 Sep 20205.43%−0.10
15 Sep 20205.53%−0.16
31 Aug 20205.69%+0.23
14 Aug 20205.46%−0.20
31 Jul 20205.66%−0.19
15 Jul 20205.85%−0.47
30 Jun 20206.32%−0.35
15 Jun 20206.67%+0.13
29 May 20206.54%−0.27
15 May 20206.81%−0.33
30 Apr 20207.14%−0.18
15 Apr 20207.32%−0.15
31 Mar 20207.47%+0.25
13 Mar 20207.22%+0.61
28 Feb 20206.61%−0.63
14 Feb 20207.24%−2.40
31 Jan 20209.64%−1.78
15 Jan 202011.42%−0.37
31 Dec 201911.79%+1.78
13 Dec 201910.01%+0.42
29 Nov 20199.59%−1.60
15 Nov 201911.19%+2.56
31 Oct 20198.63%+0.41
15 Oct 20198.22%−0.60
30 Sep 20198.82%+0.87
13 Sep 20197.95%+0.86
30 Aug 20197.09%+0.81
15 Aug 20196.28%+0.10
31 Jul 20196.18%−0.25
15 Jul 20196.43%−0.03
28 Jun 20196.46%−0.70
14 Jun 20197.16%+0.35
31 May 20196.81%−0.74
15 May 20197.55%−0.82
30 Apr 20198.37%−0.35
15 Apr 20198.72%−0.47
29 Mar 20199.19%−1.47
15 Mar 201910.66%+0.27
28 Feb 201910.39%+0.52
15 Feb 20199.87%+1.02
31 Jan 20198.85%−1.47
15 Jan 201910.32%−0.43
31 Dec 201810.75%+1.33
14 Dec 20189.42%−0.40
30 Nov 20189.82%+1.71
15 Nov 20188.11%+0.10
31 Oct 20188.01%−1.39
15 Oct 20189.40%−0.89
28 Sep 201810.29%+1.48
14 Sep 20188.81%−0.24
31 Aug 20189.05%−0.02
15 Aug 20189.07%−0.13
31 Jul 20189.20%−0.55
13 Jul 20189.75%−2.00
29 Jun 201811.75%+6.19
15 Jun 20185.56%+0.99
31 May 20184.57%−0.20
15 May 20184.77%+0.76
30 Apr 20184.01%0.00
13 Apr 20184.01%−0.86
29 Mar 20184.87%−0.37
15 Mar 20185.24%+3.04
28 Feb 20182.20%+0.72
15 Feb 20181.48%−0.63
31 Jan 20182.11%−0.19
12 Jan 20182.30%+0.24
29 Dec 20172.06%–

Newest first. Scroll inside the table for earlier dates, back to 29 Dec 2017.

Frequently asked questions

How shorted is TANDEM DIABETES CARE INC right now?
17.93% of TANDEM DIABETES CARE INC's (TNDM) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 180th most shorted US stock, out of 3,805 we rank.
What does this number include?
FINRA member firms must report their short positions in all US equities twice a month; FINRA consolidates them per security. We divide that official share count by the company's shares outstanding from its SEC filings. This is the regulatory figure, not a daily estimate.
Why does it only update twice a month?
US short interest is reported for settlement on the 15th and the last business day of each month, and FINRA publishes the consolidated figures about nine business days later. That cadence is set by regulation; no daily official figure exists.
Is this TNDM's short float?
No. This is short interest as a percentage of shares outstanding, the count in the company's SEC filings. "Short float" divides the same FINRA short count by the public float, which excludes closely held shares, so it comes out higher for the same company. We publish no float estimates: the float is not a regulatory figure.
What is TNDM's days to cover?
7.89 days for settlement date 15 Sep 2026: FINRA's own short interest ratio, the reported shares short divided by average daily trading volume. It is published in the same FINRA file and shown verbatim; we hold no volume data ourselves.
Which funds are short?
US public short interest is aggregate-only: individual short sellers are not named. Only some EU markets publish named positions.