Westlake Corporation
DE ˙ DB ˙ US9604131022
72,82 € ↓ -1,62 (-2,18%)
2026-06-04
AKTIENPREIS
SecurityDE:UEO / Westlake Corporation
InstitutionAlliancebernstein L.p.
Latest Disclosed Ownership67,315 shares
Latest Disclosed Value $ 4,977,271
Alliancebernstein L.p. reports 1.66% decrease in ownership of UEO / Westlake Corporation

On May 15, 2026 - Alliancebernstein L.p. filed a 13F-HR form disclosing ownership of 67,315 shares of Westlake Corporation (DE:UEO) valued at $6,798,815 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 68,448 shares of Westlake Corporation. This represents a change in shares of -1.66% during the quarter. The current value of the position is $4,901,878 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F WESTLAKE COM 960413102 67,315 -1,133 -1.66 4,977 -1.66 0.0016
2026-02-17 2025-12-31 13F WESTLAKE COM 960413102 68,448 1,686 2.53 5,061 -1.61 0.0016
2025-11-14 2025-09-30 13F WESTLAKE COM 960413102 66,762 -1,851 -2.70 5,145 -1.25 0.0016
2025-08-14 2025-06-30 13F WESTLAKE COM 960413102 68,613 144 0.21 5,210 -23.93 0.0017
2025-05-15 2025-03-31 13F WESTLAKE COM 960413102 68,469 4,746 7.45 6,849 -6.26 0.0025
2025-02-12 2024-12-31 13F WESTLAKE COM 960413102 63,723 -6,420 -9.15 7,306 -30.70 0.0025
2024-11-14 2024-09-30 13F WESTLAKE COM 960413102 70,143 -300 -0.43 10,542 3.33 0.0035
2024-08-14 2024-06-30 13F WESTLAKE COM 960413102 70,443 -2,206 -3.04 10,202 -8.10 0.0036
2024-05-14 2024-03-31 13F WESTLAKE COM 960413102 72,649 -202 -0.28 11,101 8.87 0.0039
2024-02-14 2023-12-31 13F WESTLAKE COM 960413102 72,851 -1,315 -1.77 10,196 10.27 0.0039
2023-11-14 2023-09-30 13F WESTLAKE COM 960413102 74,166 -4,345 -5.53 9,246 -1.42 0.0039
2023-08-15 2023-06-30 13F WESTLAKE COM 960413102 78,511 -952 -1.20 9,380 1.77 0.0038
2023-05-15 2023-03-31 13F WESTLAKE COM 960413102 79,463 -1,539 -1.90 9,216 10.97 0.0039
2023-02-15 2022-12-31 13F WESTLAKE COM 960413102 81,002 33,857 71.81 8,306 102.76 0.0037
2022-11-15 2022-09-30 13F WESTLAKE COM 960413102 47,145 -2,061 -4.19 4,096 -15.07 0.0020
2022-08-15 2022-06-30 13F WESTLAKE COM 960413102 49,206 -28,002 -36.27 4,823 -49.38 0.0022
2022-05-13 2022-03-31 13F WESTLAKE COM 960413102 77,208 25,554 49.47 9,527 89.89 0.0037
2022-02-14 2021-12-31 13F WESTLAKE CHEM COM 960413102 51,654 -12,652 -19.67 5,017 -14.40 0.0018
2021-11-10 2021-09-30 13F WESTLAKE CHEM COM 960413102 64,306 -83,338 -56.45 5,861 -55.94 0.0023
2021-07-30 2021-06-30 13F WESTLAKE CHEM COM 960413102 147,644 -136,698 -48.08 13,301 -47.32 0.0053
2021-05-06 2021-03-31 13F WESTLAKE CHEM COM 960413102 284,342 -2,150,500 -88.32 25,247 -87.29 0.0111
2021-02-08 2020-12-31 13F WESTLAKE CHEM COM 960413102 2,434,842 -247,141 -9.21 198,683 17.18 0.0938
2020-11-12 2020-09-30 13F WESTLAKE CHEM COM 960413102 2,681,983 5,315 0.20 169,555 18.07 0.0913
2020-08-13 2020-06-30 13F WESTLAKE CHEM COM 960413102 2,676,668 -84,207 -3.05 143,603 36.27 0.0844
2020-05-14 2020-03-31 13F WESTLAKE CHEM COM 960413102 2,760,875 -254,490 -8.44 105,383 -50.18 0.0756
2020-02-18 2019-12-31 13F WESTLAKE CHEM COM 960413102 3,015,365 187,428 6.63 211,528 14.16 0.1202
2019-11-14 2019-09-30 13F WESTLAKE CHEM COM 960413102 2,827,937 9,940 0.35 185,286 -5.34 0.1154
2019-08-14 2019-06-30 13F WESTLAKE CHEM COM 960413102 2,817,997 42,137 1.52 195,738 3.91 0.1216
2019-05-14 2019-03-31 13F WESTLAKE CHEM COM 960413102 2,775,860 2,371,687 586.80 188,370 604.34 0.1226
2019-02-13 2018-12-31 13F WESTLAKE CHEM COM 960413102 404,173 358,907 792.88 26,744 610.90 0.0199
2018-11-08 2018-09-30 13F WESTLAKE CHEM COM 960413102 45,266 -106,656 -70.20 3,762 -76.99 0.0025
2018-08-13 2018-06-30 13F WESTLAKE CHEM COM 960413102 151,922 83,646 122.51 16,351 115.46 0.0114
2018-05-14 2018-03-31 13F WESTLAKE CHEM COM 960413102 68,276 17,893 35.51 7,589 41.40 0.0055
2018-02-13 2017-12-31 13F WESTLAKE CHEM COM 960413102 50,383 -33,931 -40.24 5,367 -23.39 0.0038
2017-11-13 2017-09-30 13F WESTLAKE CHEM COM 960413102 84,314 38,903 85.67 7,006 132.99 0.0052
2017-08-10 2017-06-30 13F WESTLAKE CHEM COM 960413102 45,411 28,285 165.16 3,007 165.87 0.0023
2017-05-11 2017-03-31 13F WESTLAKE CHEM COM 960413102 17,126 -7,150 -29.45 1,131 -16.78 0.0009
2017-02-13 2016-12-31 13F WESTLAKE CHEM COM 960413102 24,276 -8,581 -26.12 1,359 -22.70 0.0011
2016-11-10 2016-09-30 13F WESTLAKE CHEM COM 960413102 32,857 -9,250 -21.97 1,758 -2.71 0.0015
2016-08-11 2016-06-30 13F WESTLAKE CHEM COM 960413102 42,107 -1,343,955 -96.96 1,807 -97.18 0.0016
2016-05-13 2016-03-31 13F WESTLAKE CHEM COM 960413102 1,386,062 1,311,215 1,751.86 64,175 1,478.33 0.0545
2016-02-16 2015-12-31 13F/A-1 WESTLAKE CHEM COM 960413102 74,847 -9,873 -11.65 4,066 -7.51 0.0035
2016-02-12 2015-12-31 13F WESTLAKE CHEM COM 960413102 74,847 3,884
2015-11-13 2015-09-30 13F WESTLAKE CHEM COM 960413102 84,720 8,081 10.54 4,396 -16.38 0.0038
2015-08-14 2015-06-30 13F WESTLAKE CHEM COM 960413102 76,639 -19,005 -19.87 5,257 -23.60 0.0043
2015-05-13 2015-03-31 13F WESTLAKE CHEMICAL COM 960413102 95,644 8,690 9.99 6,881 29.54 0.0056
2015-02-13 2014-12-31 13F WESTLAKE CHEMICAL COM 960413102 86,954 46,253 113.64 5,312 50.74 0.0044
2014-11-13 2014-09-30 13F WESTLAKE CHEMICAL COM 960413102 40,701 -25,259 -38.29 3,524 -36.22 0.0030
2014-08-13 2014-06-30 13F WESTLAKE CHEMICAL COM 960413102 65,960 5,554 9.19 5,525 38.19 0.0047
2014-05-13 2014-03-31 13F WESTLAKE CHEMICAL COM 960413102 60,406 20,735 52.27 3,998 -17.45 0.0035
2014-02-13 2013-12-31 13F WESTLAKE CHEMICAL COM 960413102 39,671 11,239 39.53 4,843 62.74 0.0043
2013-11-14 2013-09-30 13F WESTLAKE CHEMICAL COM 960413102 28,432 1,160 4.25 2,976 13.20 0.0029
2013-08-13 2013-06-30 13F WESTLAKE CHEMICAL COM 960413102 27,272 27,272 2,629 0.0028
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.