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HowShorted

How shorted is Westlake Corporation? WLK

#1,993most shorted US stockof 3,805 ranked stocks, more shorted than 47%

4.15%
of shares outstanding reported short · settlement date 15 Sep 2026
vs previous report
−0.29
5 reports (~10 weeks)
+0.35
days to cover
7.42
Aggregate net short position time series for Westlake Corporation

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 Westlake Corporation 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 20263.78% 31 Jul 20263.86% 14 Aug 2026+0.08
5 May 20262.72% 30 Apr 20262.81% 15 May 2026+0.09
24 Feb 20264.33% 13 Feb 20263.91% 27 Feb 2026−0.42
30 Oct 20254.01% 15 Oct 20254.05% 31 Oct 2025+0.04
5 Aug 20253.39% 31 Jul 20253.62% 15 Aug 2025+0.23
2 May 20252.18% 30 Apr 20252.87% 15 May 2025+0.69
24 Feb 20251.19% 14 Feb 20251.19% 28 Feb 20250.00
5 Nov 20240.85% 31 Oct 20240.94% 15 Nov 2024+0.09

Fails to deliver

The SEC's fails-to-deliver figure for WLK: 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
100
26 Aug 2026
Highest in window
120,840
12 Nov 2025
Days with a balance
80
Window
16 Sep 2025 to 14 Sep 2026
Aggregate net short position time series for Westlake Corporation 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 121K shares.

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Sector: Materials

History

Full reported short interest history
Settlement dateShort %Change
15 Sep 20264.15%−0.29
31 Aug 20264.44%+0.58
14 Aug 20263.86%+0.08
31 Jul 20263.78%−0.34
15 Jul 20264.12%+0.32
30 Jun 20263.80%+0.70
15 Jun 20263.10%+0.18
29 May 20262.92%+0.11
15 May 20262.81%+0.09
30 Apr 20262.72%+0.03
15 Apr 20262.69%−0.78
31 Mar 20263.47%−0.45
13 Mar 20263.92%+0.01
27 Feb 20263.91%−0.42
13 Feb 20264.33%−0.42
30 Jan 20264.75%−0.16
15 Jan 20264.91%+0.08
31 Dec 20254.83%+0.57
15 Dec 20254.26%−0.57
28 Nov 20254.83%+0.92
14 Nov 20253.91%−0.14
31 Oct 20254.05%+0.04
15 Oct 20254.01%+0.54
30 Sep 20253.47%−0.21
15 Sep 20253.68%+0.25
29 Aug 20253.43%−0.19
15 Aug 20253.62%+0.23
31 Jul 20253.39%+0.63
15 Jul 20252.76%+0.40
30 Jun 20252.36%+0.15
13 Jun 20252.21%−0.55
30 May 20252.76%−0.11
15 May 20252.87%+0.69
30 Apr 20252.18%−0.27
15 Apr 20252.45%+0.36
31 Mar 20252.09%+0.53
14 Mar 20251.56%+0.37
28 Feb 20251.19%0.00
14 Feb 20251.19%+0.03
31 Jan 20251.16%−0.02
15 Jan 20251.18%−0.08
31 Dec 20241.26%+0.18
13 Dec 20241.08%+0.07
29 Nov 20241.01%+0.07
15 Nov 20240.94%+0.09
31 Oct 20240.85%+0.10
15 Oct 20240.75%−0.09
30 Sep 20240.84%−0.06
13 Sep 20240.90%+0.01
30 Aug 20240.89%−0.07
15 Aug 20240.96%+0.02
31 Jul 20240.94%+0.01
15 Jul 20240.93%−0.09
28 Jun 20241.02%−0.26
14 Jun 20241.28%−0.07
31 May 20241.35%+0.34
15 May 20241.01%+0.06
30 Apr 20240.95%−0.19
15 Apr 20241.14%−0.04
28 Mar 20241.18%+0.03
15 Mar 20241.15%−0.13
29 Feb 20241.28%+0.05
15 Feb 20241.23%−0.13
31 Jan 20241.36%−0.17
12 Jan 20241.53%+0.03
29 Dec 20231.50%−0.20
15 Dec 20231.70%−0.14
30 Nov 20231.84%−0.10
15 Nov 20231.94%−0.12
31 Oct 20232.06%+0.03
13 Oct 20232.03%−0.02
29 Sep 20232.05%+0.13
15 Sep 20231.92%+0.05
31 Aug 20231.87%−0.03
15 Aug 20231.90%+0.15
31 Jul 20231.75%−0.13
14 Jul 20231.88%−0.24
30 Jun 20232.12%+0.21
15 Jun 20231.91%+0.10
31 May 20231.81%−0.02
15 May 20231.83%+0.02
28 Apr 20231.81%−0.15
14 Apr 20231.96%+0.02
31 Mar 20231.94%−0.07
15 Mar 20232.01%−0.45
28 Feb 20232.46%+0.08
15 Feb 20232.38%+0.08
31 Jan 20232.30%−0.17
13 Jan 20232.47%−0.07
30 Dec 20222.54%+0.27
15 Dec 20222.27%+0.06
30 Nov 20222.21%−0.10
15 Nov 20222.31%+0.07
31 Oct 20222.24%+0.22
14 Oct 20222.02%+0.03
30 Sep 20221.99%+0.57
15 Sep 20221.42%−0.02
31 Aug 20221.44%+0.18
15 Aug 20221.26%−0.38
29 Jul 20221.64%+0.25
15 Jul 20221.39%+0.06
30 Jun 20221.33%−0.19
15 Jun 20221.52%+0.06
31 May 20221.46%+0.32
13 May 20221.14%−0.07
29 Apr 20221.21%+0.16
14 Apr 20221.05%−0.07
31 Mar 20221.12%−0.45
15 Mar 20221.57%+0.32
28 Feb 20221.25%+0.10
15 Feb 20221.15%+0.23
31 Jan 20220.92%+0.24
14 Jan 20220.68%−0.31
31 Dec 20210.99%+0.03
15 Dec 20210.96%+0.12
30 Nov 20210.84%+0.26
15 Nov 20210.58%−0.53
29 Oct 20211.11%−0.11
15 Oct 20211.22%−0.18
30 Sep 20211.40%−0.38
15 Sep 20211.78%+0.01
31 Aug 20211.77%+0.13
13 Aug 20211.64%+0.30
30 Jul 20211.34%+0.08
15 Jul 20211.26%+0.32
30 Jun 20210.94%+0.07
15 Jun 20210.87%−0.74
30 Apr 20211.61%+1.26
26 Feb 20210.35%−0.15
12 Feb 20210.50%−0.08
29 Jan 20210.58%−0.05
15 Jan 20210.63%−0.02
31 Dec 20200.65%−0.15
15 Dec 20200.80%−0.23
30 Nov 20201.03%−0.15
13 Nov 20201.18%−0.23
30 Oct 20201.41%−0.19
15 Oct 20201.60%−0.12
30 Sep 20201.72%−0.41
15 Sep 20202.13%−0.32
31 Aug 20202.45%−0.39
14 Aug 20202.84%+0.01
31 Jul 20202.83%+0.14
15 Jul 20202.69%−0.04
30 Jun 20202.73%−0.17
15 Jun 20202.90%−0.10
29 May 20203.00%−0.15
15 May 20203.15%−0.03
30 Apr 20203.18%+0.80
15 Apr 20202.38%+0.15
31 Mar 20202.23%+0.13
13 Mar 20202.10%+0.27
28 Feb 20201.83%+0.29
14 Feb 20201.54%+0.04
31 Jan 20201.50%+0.15
15 Jan 20201.35%−0.07
31 Dec 20191.42%−0.16
13 Dec 20191.58%−0.16
29 Nov 20191.74%−0.04
15 Nov 20191.78%−0.05
31 Oct 20191.83%−0.19
15 Oct 20192.02%−0.37
30 Sep 20192.39%−0.27
13 Sep 20192.66%−0.33
30 Aug 20192.99%−0.32
15 Aug 20193.31%−0.02
31 Jul 20193.33%−0.03
15 Jul 20193.36%+0.88
28 Jun 20192.48%+0.04
14 Jun 20192.44%−0.04
31 May 20192.48%+0.32
15 May 20192.16%−0.31
30 Apr 20192.47%−0.15
15 Apr 20192.62%+0.99
29 Mar 20191.63%−0.14
15 Mar 20191.77%−0.31
28 Feb 20192.08%−0.51
15 Feb 20192.59%+0.41
31 Jan 20192.18%−0.01
15 Jan 20192.19%−0.08
31 Dec 20182.27%−0.49
14 Dec 20182.76%+0.05
30 Nov 20182.71%+0.92
15 Nov 20181.79%+0.02
31 Oct 20181.77%−0.25
15 Oct 20182.02%−0.28
28 Sep 20182.30%−0.96
14 Sep 20183.26%−0.31
31 Aug 20183.57%+0.06
15 Aug 20183.51%+0.13
31 Jul 20183.38%−0.18
13 Jul 20183.56%+0.64
29 Jun 20182.92%+0.15
15 Jun 20182.77%−0.29
31 May 20183.06%0.00
15 May 20183.06%+0.11
30 Apr 20182.95%−0.32
13 Apr 20183.27%+0.39
29 Mar 20182.88%−0.10
15 Mar 20182.98%+0.19
28 Feb 20182.79%+0.13
15 Feb 20182.66%+0.13
31 Jan 20182.53%−0.18
12 Jan 20182.71%+0.14
29 Dec 20172.57%–

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

Frequently asked questions

How shorted is Westlake Corporation right now?
4.15% of Westlake Corporation's (WLK) shares outstanding were reported short for settlement date 15 Sep 2026, per FINRA's consolidated short interest report. That makes it the 1,993rd 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 WLK'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 WLK's days to cover?
7.42 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.