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HowShorted

How shorted is CENTURY ALUMINUM CO? CENX

#702most shorted US stockof 3,805 ranked stocks, more shorted than 81%

9.80%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−0.49
5 reports (~10 weeks)
+0.17
days to cover
6.34
Aggregate net short position time series for CENTURY ALUMINUM CO

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 CENTURY ALUMINUM CO 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 202610.02% 31 Jul 20269.27% 14 Aug 2026−0.75
7 May 20268.76% 30 Apr 20268.27% 15 May 2026−0.49
19 Feb 20268.59% 13 Feb 20268.62% 27 Feb 2026+0.03
7 Aug 20257.23% 31 Jul 20255.85% 15 Aug 2025−1.38
7 May 20255.61% 30 Apr 20257.03% 15 May 2025+1.42
20 Feb 20255.18% 14 Feb 20255.53% 28 Feb 2025+0.35
4 Nov 20245.10% 31 Oct 20245.18% 15 Nov 2024+0.08
8 Aug 20245.13% 31 Jul 20245.71% 15 Aug 2024+0.58

Fails to deliver

The SEC's fails-to-deliver figure for CENX: 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
803
2 Sep 2026
Highest in window
2,640,213
5 Mar 2026
Days with a balance
45
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for CENTURY ALUMINUM CO 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 2.6M shares.

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Sector: Materials

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20269.80%−0.49
31 Aug 202610.29%+1.02
14 Aug 20269.27%−0.75
31 Jul 202610.02%+0.14
15 Jul 20269.88%+0.25
30 Jun 20269.63%+1.29
15 Jun 20268.34%+0.21
29 May 20268.13%−0.14
15 May 20268.27%−0.49
30 Apr 20268.76%+0.07
15 Apr 20268.69%+0.58
31 Mar 20268.11%−0.26
13 Mar 20268.37%−0.25
27 Feb 20268.62%+0.03
13 Feb 20268.59%−0.38
30 Jan 20268.97%−0.05
15 Jan 20269.02%+0.86
31 Dec 20258.16%+0.05
15 Dec 20258.11%+0.20
28 Nov 20257.91%−0.44
14 Nov 20258.35%+0.31
31 Oct 20258.04%−0.62
15 Oct 20258.66%+1.46
30 Sep 20257.20%+0.57
15 Sep 20256.63%+0.15
29 Aug 20256.48%+0.63
15 Aug 20255.85%−1.38
31 Jul 20257.23%+0.02
15 Jul 20257.21%+0.36
30 Jun 20256.85%+0.05
13 Jun 20256.80%+0.08
30 May 20256.72%−0.31
15 May 20257.03%+1.42
30 Apr 20255.61%−0.69
15 Apr 20256.30%+0.52
31 Mar 20255.78%+0.75
14 Mar 20255.03%−0.50
28 Feb 20255.53%+0.35
14 Feb 20255.18%+0.55
31 Jan 20254.63%−0.68
15 Jan 20255.31%+0.21
31 Dec 20245.10%+0.04
13 Dec 20245.06%+0.50
29 Nov 20244.56%−0.62
15 Nov 20245.18%+0.08
31 Oct 20245.10%−0.81
15 Oct 20245.91%−0.29
30 Sep 20246.20%+0.18
13 Sep 20246.02%−0.25
30 Aug 20246.27%+0.56
15 Aug 20245.71%+0.58
31 Jul 20245.13%−0.98
15 Jul 20246.11%+0.35
28 Jun 20245.76%−2.30
14 Jun 20248.06%+0.70
31 May 20247.36%−0.67
15 May 20248.03%−0.32
30 Apr 20248.35%+0.57
15 Apr 20247.78%−0.07
28 Mar 20247.85%+0.26
15 Mar 20247.59%+0.16
29 Feb 20247.43%−0.82
15 Feb 20248.25%−0.67
31 Jan 20248.92%−0.94
12 Jan 20249.86%−0.94
29 Dec 202310.80%−1.05
15 Dec 202311.85%+0.65
30 Nov 202311.20%+0.48
15 Nov 202310.72%−0.13
31 Oct 202310.85%+0.19
13 Oct 202310.66%+0.49
29 Sep 202310.17%+2.12
15 Sep 20238.05%+0.87
31 Aug 20237.18%−0.29
15 Aug 20237.47%+0.63
31 Jul 20236.84%−0.47
14 Jul 20237.31%+0.34
30 Jun 20236.97%−0.95
15 Jun 20237.92%−0.44
31 May 20238.36%−0.11
15 May 20238.47%+0.62
28 Apr 20237.85%+0.98
14 Apr 20236.87%−0.28
31 Mar 20237.15%+0.39
15 Mar 20236.76%+0.40
28 Feb 20236.36%+0.13
15 Feb 20236.23%+0.24
31 Jan 20235.99%+0.09
13 Jan 20235.90%+0.46
30 Dec 20225.44%−0.97
15 Dec 20226.41%+0.73
30 Nov 20225.68%−1.08
15 Nov 20226.76%−0.80
31 Oct 20227.56%+1.03
14 Oct 20226.53%+0.34
30 Sep 20226.19%+0.42
15 Sep 20225.77%−0.12
31 Aug 20225.89%−0.32
15 Aug 20226.21%−1.53
29 Jul 20227.74%−0.39
15 Jul 20228.13%+0.35
30 Jun 20227.78%+1.34
15 Jun 20226.44%+0.21
31 May 20226.23%+0.94
13 May 20225.29%+0.73
29 Apr 20224.56%−0.51
14 Apr 20225.07%−0.55
31 Mar 20225.62%−2.24
15 Mar 20227.86%+0.65
28 Feb 20227.21%+0.61
15 Feb 20226.60%+1.17
31 Jan 20225.43%+0.75
14 Jan 20224.68%+0.20
31 Dec 20214.48%−0.06
15 Dec 20214.54%−0.11
30 Nov 20214.65%+0.12
15 Nov 20214.53%−0.47
29 Oct 20215.00%+0.04
15 Oct 20214.96%−0.13
30 Sep 20215.09%−1.29
15 Sep 20216.38%−0.02
31 Aug 20216.40%+0.63
13 Aug 20215.77%−0.47
30 Jul 20216.24%−0.24
15 Jul 20216.48%−0.07
30 Jun 20216.55%+1.70
15 Jun 20214.85%−0.19
28 May 20215.04%+0.26
14 May 20214.78%+0.84
30 Apr 20213.94%−0.14
15 Apr 20214.08%+1.69
31 Mar 20212.39%−0.86
15 Mar 20213.25%−0.21
26 Feb 20213.46%+0.06
12 Feb 20213.40%+0.14
29 Jan 20213.26%+0.18
15 Jan 20213.08%−0.05
31 Dec 20203.13%+0.24
15 Dec 20202.89%+0.34
30 Nov 20202.55%−0.23
13 Nov 20202.78%−0.04
30 Oct 20202.82%−0.38
15 Oct 20203.20%−1.21
30 Sep 20204.41%+0.75
15 Sep 20203.66%+0.68
31 Aug 20202.98%−0.16
14 Aug 20203.14%+0.03
31 Jul 20203.11%−0.41
15 Jul 20203.52%−0.19
30 Jun 20203.71%+0.25
15 Jun 20203.46%+0.05
29 May 20203.41%−0.78
15 May 20204.19%−0.28
30 Apr 20204.47%−0.97
15 Apr 20205.44%+0.09
31 Mar 20205.35%−2.02
13 Mar 20207.37%−1.83
28 Feb 20209.20%−0.93
14 Feb 202010.13%+0.25
31 Jan 20209.88%+0.42
15 Jan 20209.46%+0.72
31 Dec 20198.74%−0.79
13 Dec 20199.53%+0.25
29 Nov 20199.28%−0.23
15 Nov 20199.51%+1.06
31 Oct 20198.45%+1.20
15 Oct 20197.25%+0.59
30 Sep 20196.66%+0.50
13 Sep 20196.16%−1.04
30 Aug 20197.20%+0.26
15 Aug 20196.94%+0.05
31 Jul 20196.89%−1.40
15 Jul 20198.29%−0.44
28 Jun 20198.73%+0.62
14 Jun 20198.11%+0.41
31 May 20197.70%+0.56
15 May 20197.14%+0.36
30 Apr 20196.78%+0.61
15 Apr 20196.17%+0.01
29 Mar 20196.16%−0.03
15 Mar 20196.19%+0.23
28 Feb 20195.96%−0.38
15 Feb 20196.34%−0.06
31 Jan 20196.40%+0.73
15 Jan 20195.67%−1.83
31 Dec 20187.50%+0.07
14 Dec 20187.43%+0.17
30 Nov 20187.26%+0.86
15 Nov 20186.40%−1.31
31 Oct 20187.71%+1.68
15 Oct 20186.03%−1.05
28 Sep 20187.08%+2.21
14 Sep 20184.87%+0.01
31 Aug 20184.86%+0.62
15 Aug 20184.24%+0.14
31 Jul 20184.10%+0.49
13 Jul 20183.61%−0.75
29 Jun 20184.36%+0.46
15 Jun 20183.90%+0.22
31 May 20183.68%−0.53
15 May 20184.21%−0.77
30 Apr 20184.98%−0.26
13 Apr 20185.24%−0.09
29 Mar 20185.33%−1.30
15 Mar 20186.63%−0.83
28 Feb 20187.46%−1.41
15 Feb 20188.87%+0.20
31 Jan 20188.67%−1.51
12 Jan 201810.18%+0.69
29 Dec 20179.49%–

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

Frequently asked questions

How shorted is CENTURY ALUMINUM CO right now?
9.80% of CENTURY ALUMINUM CO's (CENX) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 702nd 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 CENX'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 CENX's days to cover?
6.34 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.