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HowShorted

How shorted is Core Natural Resources, Inc.? CNR

#2,120most shorted US stockof 3,805 ranked stocks, more shorted than 44%

The ticker CNR previously referred to Cornerstone Building Brands, Inc. (to 2022).

3.83%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
+0.17
5 reports (~10 weeks)
+0.64
days to cover
4.36
Aggregate net short position time series for Core Natural Resources, 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 Core Natural Resources, 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 20263.06% 31 Jul 20263.18% 14 Aug 2026+0.12
7 May 20264.16% 30 Apr 20263.73% 15 May 2026−0.43
12 Feb 20264.86% 30 Jan 20263.92% 13 Feb 2026−0.94
6 Nov 20254.85% 31 Oct 20255.63% 14 Nov 2025+0.78
5 Aug 20255.60% 31 Jul 20254.77% 15 Aug 2025−0.83
8 May 20254.86% 30 Apr 20255.02% 15 May 2025+0.16
5 Nov 20245.61% 31 Oct 20249.93% 15 Nov 2024+4.32
8 Aug 20244.30% 31 Jul 20243.84% 15 Aug 2024−0.46

Fails to deliver

The SEC's fails-to-deliver figure for CNR: 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
2,669
28 Aug 2026
Highest in window
63,874
13 Nov 2025
Days with a balance
56
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Core Natural Resources, 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 64K shares.

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

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20263.83%+0.17
31 Aug 20263.66%+0.48
14 Aug 20263.18%+0.12
31 Jul 20263.06%−0.27
15 Jul 20263.33%+0.14
30 Jun 20263.19%+0.07
15 Jun 20263.12%−1.02
29 May 20264.14%+0.41
15 May 20263.73%−0.43
30 Apr 20264.16%+0.94
15 Apr 20263.22%−0.58
31 Mar 20263.80%−0.43
13 Mar 20264.23%+0.16
27 Feb 20264.07%+0.15
13 Feb 20263.92%−0.94
30 Jan 20264.86%−0.31
15 Jan 20265.17%−0.36
31 Dec 20255.53%−0.50
15 Dec 20256.03%+0.10
28 Nov 20255.93%+0.30
14 Nov 20255.63%+0.78
31 Oct 20254.85%−1.50
15 Oct 20256.35%+0.73
30 Sep 20255.62%+0.74
15 Sep 20254.88%+0.08
29 Aug 20254.80%+0.03
15 Aug 20254.77%−0.83
31 Jul 20255.60%−0.49
15 Jul 20256.09%−0.63
30 Jun 20256.72%+0.31
13 Jun 20256.41%+0.06
30 May 20256.35%+1.33
15 May 20255.02%+0.16
30 Apr 20254.86%−3.83
31 Dec 20248.69%−0.07
13 Dec 20248.76%+0.05
29 Nov 20248.71%−1.22
15 Nov 20249.93%+4.32
31 Oct 20245.61%−0.59
15 Oct 20246.20%+0.81
30 Sep 20245.39%+0.02
13 Sep 20245.37%−0.61
30 Aug 20245.98%+2.14
15 Aug 20243.84%−0.46
31 Jul 20244.30%−0.06
15 Jul 20244.36%−0.02
28 Jun 20244.38%−1.05
14 Jun 20245.43%−0.52
31 May 20245.95%−0.87
15 May 20246.82%−0.20
30 Apr 20247.02%−0.71
15 Apr 20247.73%−0.15
28 Mar 20247.88%0.00
15 Mar 20247.88%+0.11
29 Feb 20247.77%−0.13
15 Feb 20247.90%−0.19
31 Jan 20248.09%+0.88
12 Jan 20247.21%+0.54
29 Dec 20236.67%−0.70
15 Dec 20237.37%+0.73
30 Nov 20236.64%+0.42
15 Nov 20236.22%−0.73
31 Oct 20236.95%−0.05
13 Oct 20237.00%−0.01
29 Sep 20237.01%−1.11
15 Sep 20238.12%−0.11
31 Aug 20238.23%−1.10
15 Aug 20239.33%+0.63
31 Jul 20238.70%+0.71
14 Jul 20237.99%+0.26
30 Jun 20237.73%−0.78
15 Jun 20238.51%+1.14
31 May 20237.37%−0.93
15 May 20238.30%+0.37
28 Apr 20237.93%+0.47
14 Apr 20237.46%−0.33
31 Mar 20237.79%+0.38
15 Mar 20237.41%+0.45
28 Feb 20236.96%+1.25
15 Feb 20235.71%+1.36
31 Jan 20234.35%+0.02
13 Jan 20234.33%+0.40
30 Dec 20223.93%−0.75
15 Dec 20224.68%+0.61
30 Nov 20224.07%−0.13
15 Nov 20224.20%−1.09
31 Oct 20225.29%−0.93
14 Oct 20226.22%−0.20
30 Sep 20226.42%+0.44
15 Sep 20225.98%+0.19
31 Aug 20225.79%+0.28
15 Aug 20225.51%−0.41
29 Jul 20225.92%+0.90
15 Jul 20225.02%+0.39
30 Jun 20224.63%+0.60
15 Jun 20224.03%−0.68
31 May 20224.71%+0.46
13 May 20224.25%−0.04
29 Apr 20224.29%+0.51
14 Apr 20223.78%+0.25
31 Mar 20223.53%−1.00
15 Mar 20224.53%+0.03
28 Feb 20224.50%−0.28
15 Feb 20224.78%+0.08
31 Jan 20224.70%+0.38
14 Jan 20224.32%−0.30
31 Dec 20214.62%+0.23
15 Dec 20214.39%−0.22
30 Nov 20214.61%+0.21
15 Nov 20214.40%+0.95
29 Oct 20213.45%+0.13
15 Oct 20213.32%−0.38
30 Sep 20213.70%−0.63
15 Sep 20214.33%−0.04
31 Aug 20214.37%−0.14
13 Aug 20214.51%−0.05
30 Jul 20214.56%+0.23
15 Jul 20214.33%−0.04
30 Jun 20214.37%−0.45
15 Jun 20214.82%−0.34
28 May 20215.16%+0.28
14 May 20214.88%−0.21
30 Apr 20215.09%−0.24
15 Apr 20215.33%−0.38
31 Mar 20215.71%−0.79
15 Mar 20216.50%+0.01
26 Feb 20216.49%−0.85
12 Feb 20217.34%+0.37
29 Jan 20216.97%−3.15
15 Jan 202110.12%−3.73
31 Dec 202013.85%−0.04
15 Dec 202013.89%+1.16
30 Nov 202012.73%−0.62
13 Nov 202013.35%+0.79
30 Oct 202012.56%+0.11
15 Oct 202012.45%+0.28
30 Sep 202012.17%−1.12
15 Sep 202013.29%+0.06
31 Aug 202013.23%−0.69
14 Aug 202013.92%+1.27
31 Jul 202012.65%−0.31
15 Jul 202012.96%+0.36
30 Jun 202012.60%−0.33
15 Jun 202012.93%−3.57
29 May 202016.50%−0.70
15 May 202017.20%−2.78
30 Apr 202019.98%−1.88
15 Apr 202021.86%+1.37
31 Mar 202020.49%+0.65
13 Mar 202019.84%−3.11
28 Feb 202022.95%+3.71
14 Feb 202019.24%+0.94
31 Jan 202018.30%+3.12
15 Jan 202015.18%+0.17
31 Dec 201915.01%−1.92
13 Dec 201916.93%+1.12
29 Nov 201915.81%−0.77
15 Nov 201916.58%−0.93
31 Oct 201917.51%+1.37
15 Oct 201916.14%–

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

Frequently asked questions

How shorted is Core Natural Resources, Inc. right now?
3.83% of Core Natural Resources, Inc.'s (CNR) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 2,120th 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 CNR'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 CNR's days to cover?
4.36 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.