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HowShorted

How shorted is TransMedics Group, Inc.? TMDX

#71most shorted US stockof 3,805 ranked stocks, more shorted than 98%

23.01%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−0.29
5 reports (~10 weeks)
+0.25
days to cover
10.68
Aggregate net short position time series for TransMedics Group, 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 TransMedics Group, 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
4 Aug 202622.13% 31 Jul 202622.81% 14 Aug 2026+0.68
5 May 202624.07% 30 Apr 202623.66% 15 May 2026−0.41
27 Feb 202623.98% 13 Feb 202624.29% 13 Mar 2026+0.31
24 Feb 202623.98% 13 Feb 202624.72% 27 Feb 2026+0.74
29 Oct 202523.38% 15 Oct 202522.07% 31 Oct 2025−1.31
30 Jul 202523.63% 15 Jul 202522.50% 31 Jul 2025−1.13
8 May 202526.00% 30 Apr 202523.95% 15 May 2025−2.05
27 Feb 202531.96% 14 Feb 202527.72% 28 Feb 2025−4.24

Fails to deliver

The SEC's fails-to-deliver figure for TMDX: 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
31,021
11 Sep 2026
Highest in window
99,526
9 Mar 2026
Days with a balance
97
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for TransMedics Group, 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 100K shares.

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Sector: Healthcare · By year: 2019 · 2020 · 2021 · 2022 · 2023 · 2024 · 2025 · 2026

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 202623.01%−0.29
31 Aug 202623.30%+0.49
14 Aug 202622.81%+0.68
31 Jul 202622.13%−0.19
15 Jul 202622.32%−0.44
30 Jun 202622.76%+0.54
15 Jun 202622.22%+0.93
29 May 202621.29%−2.37
15 May 202623.66%−0.41
30 Apr 202624.07%+1.90
15 Apr 202622.17%−1.24
31 Mar 202623.41%−0.88
13 Mar 202624.29%−0.43
27 Feb 202624.72%+0.74
13 Feb 202623.98%+0.97
30 Jan 202623.01%+1.71
15 Jan 202621.30%+0.23
31 Dec 202521.07%+0.60
15 Dec 202520.47%−2.11
28 Nov 202522.58%+2.50
14 Nov 202520.08%−1.99
31 Oct 202522.07%−1.31
15 Oct 202523.38%−0.51
30 Sep 202523.89%−0.73
15 Sep 202524.62%+0.36
29 Aug 202524.26%+1.26
15 Aug 202523.00%+0.50
31 Jul 202522.50%−1.13
15 Jul 202523.63%−0.15
30 Jun 202523.78%+0.55
13 Jun 202523.23%−0.66
30 May 202523.89%−0.06
15 May 202523.95%−2.05
30 Apr 202526.00%−0.09
15 Apr 202526.09%−2.06
31 Mar 202528.15%−0.22
14 Mar 202528.37%+0.65
28 Feb 202527.72%−4.24
14 Feb 202531.96%−1.10
31 Jan 202533.06%+6.27
15 Jan 202526.79%−0.48
31 Dec 202427.27%+1.53
13 Dec 202425.74%−1.94
29 Nov 202427.68%+0.94
15 Nov 202426.74%+1.63
31 Oct 202425.11%+5.92
15 Oct 202419.19%+1.26
30 Sep 202417.93%+1.45
13 Sep 202416.48%−1.12
30 Aug 202417.60%−0.58
15 Aug 202418.18%+0.96
31 Jul 202417.22%−0.61
15 Jul 202417.83%−0.39
28 Jun 202418.22%+0.06
14 Jun 202418.16%+0.66
31 May 202417.50%+1.40
15 May 202416.10%−0.36
30 Apr 202416.46%−2.87
15 Apr 202419.33%+1.02
28 Mar 202418.31%+1.78
15 Mar 202416.53%+1.30
29 Feb 202415.23%+0.16
15 Feb 202415.07%−1.51
31 Jan 202416.58%−0.02
12 Jan 202416.60%−0.50
29 Dec 202317.10%−0.02
15 Dec 202317.12%−0.97
30 Nov 202318.09%−0.97
15 Nov 202319.06%−0.88
31 Oct 202319.94%+2.00
13 Oct 202317.94%+2.03
29 Sep 202315.91%+1.29
15 Sep 202314.62%+1.91
31 Aug 202312.71%+1.45
15 Aug 202311.26%+0.37
31 Jul 202310.89%−1.01
14 Jul 202311.90%−0.23
30 Jun 202312.13%+0.42
15 Jun 202311.71%+1.00
31 May 202310.71%+0.57
15 May 202310.14%+2.65
28 Apr 20237.49%+0.73
14 Apr 20236.76%+0.95
31 Mar 20235.81%+0.72
15 Mar 20235.09%+0.41
28 Feb 20234.68%+0.49
15 Feb 20234.19%+0.05
31 Jan 20234.14%−0.60
13 Jan 20234.74%−0.06
30 Dec 20224.80%+0.01
15 Dec 20224.79%−1.20
30 Nov 20225.99%−0.64
15 Nov 20226.63%−0.54
31 Oct 20227.17%−1.14
14 Oct 20228.31%+1.00
30 Sep 20227.31%+2.28
15 Sep 20225.03%−0.40
31 Aug 20225.43%−0.10
15 Aug 20225.53%−0.08
29 Jul 20225.61%+0.24
15 Jul 20225.37%−0.71
30 Jun 20226.08%+0.29
15 Jun 20225.79%+0.16
31 May 20225.63%−0.55
13 May 20226.18%+2.22
29 Apr 20223.96%−0.08
14 Apr 20224.04%−0.01
31 Mar 20224.05%−2.04
15 Mar 20226.09%+0.59
28 Feb 20225.50%+1.10
15 Feb 20224.40%+0.35
31 Jan 20224.05%+0.08
14 Jan 20223.97%+0.04
31 Dec 20213.93%−0.90
15 Dec 20214.83%+0.21
30 Nov 20214.62%−0.17
15 Nov 20214.79%+1.59
29 Oct 20213.20%−0.20
15 Oct 20213.40%+0.01
30 Sep 20213.39%−0.31
15 Sep 20213.70%−0.21
31 Aug 20213.91%−0.53
13 Aug 20214.44%−0.66
30 Jul 20215.10%+0.33
15 Jul 20214.77%−0.81
30 Jun 20215.58%+0.50
15 Jun 20215.08%+0.50
28 May 20214.58%+0.89
14 May 20213.69%+0.08
30 Apr 20213.61%+0.36
15 Apr 20213.25%−0.33
31 Mar 20213.58%+0.84
15 Mar 20212.74%−1.50
26 Feb 20214.24%+1.08
12 Feb 20213.16%−0.14
29 Jan 20213.30%+0.10
15 Jan 20213.20%+0.07
31 Dec 20203.13%+0.04
15 Dec 20203.09%−0.36
30 Nov 20203.45%−0.10
13 Nov 20203.55%+0.33
30 Oct 20203.22%−0.32
15 Oct 20203.54%−2.36
30 Sep 20205.90%+0.79
15 Sep 20205.11%+0.80
31 Aug 20204.31%−0.04
14 Aug 20204.35%−0.43
31 Jul 20204.78%−2.03
15 Jul 20206.81%+0.66
30 Jun 20206.15%+1.07
15 Jun 20205.08%−4.40
29 May 20209.48%+3.17
15 May 20206.31%+0.18
30 Apr 20206.13%−0.08
15 Apr 20206.21%−0.37
31 Mar 20206.58%−0.82
13 Mar 20207.40%+0.22
28 Feb 20207.18%+0.33
14 Feb 20206.85%+0.14
31 Jan 20206.71%−0.75
15 Jan 20207.46%+0.44
31 Dec 20197.02%+0.71
13 Dec 20196.31%−0.15
29 Nov 20196.46%−0.79
15 Nov 20197.25%−0.02
31 Oct 20197.27%−0.17
15 Oct 20197.44%–

Newest first. Scroll inside the table for earlier dates, back to 15 Oct 2019.

Frequently asked questions

How shorted is TransMedics Group, Inc. right now?
23.01% of TransMedics Group, Inc.'s (TMDX) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 71st 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 TMDX'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 TMDX's days to cover?
10.68 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.