Westlake Corporation
DE ˙ DB ˙ US9604131022
72,82 € ↓ -1,62 (-2,18%)
2026-06-04
CENA AKCJI
SecurityDE:UEO / Westlake Corporation
InstitutionState Street Corp
Latest Disclosed Ownership1,380,493 shares
Latest Disclosed Value $ 161,269,192
State Street Corp reports 1.16% decrease in ownership of UEO / Westlake Corporation

On May 15, 2026 - State Street Corp filed a 13F-HR form disclosing ownership of 1,380,493 shares of Westlake Corporation (DE:UEO) valued at $139,429,793 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 1,396,633 shares of Westlake Corporation. This represents a change in shares of -1.16% during the quarter. The current value of the position is $100,527,500 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 1,380,493 -16,140 -1.16 161,269 56.17 0.0056
2026-02-13 2025-12-31 13F WESTLAKE COM 960413102 1,396,633 101,391 7.83 103,267 3.46 0.0035
2025-11-14 2025-09-30 13F WESTLAKE COM 960413102 1,295,242 -96,985 -6.97 99,811 -5.58 0.0035
2025-08-14 2025-06-30 13F WESTLAKE COM 960413102 1,392,227 -237,879 -14.59 105,712 -35.17 0.0040
2025-05-15 2025-03-31 13F WESTLAKE COM 960413102 1,630,106 435,857 36.50 163,060 19.09 0.0067
2025-02-14 2024-12-31 13F WESTLAKE COM 960413102 1,194,249 -4,461 -0.37 136,919 -24.00 0.0054
2024-11-14 2024-09-30 13F WESTLAKE COM 960413102 1,198,710 9,838 0.83 180,154 4.64 0.0073
2024-08-14 2024-06-30 13F WESTLAKE COM 960413102 1,188,872 1,803 0.15 172,172 -5.08 0.0075
2024-05-15 2024-03-31 13F WESTLAKE COM 960413102 1,187,069 -10,083 -0.84 181,384 8.25 0.0081
2024-02-14 2023-12-31 13F WESTLAKE COM 960413102 1,197,152 68,697 6.09 167,553 19.10 0.0081
2023-11-14 2023-09-30 13F WESTLAKE COM 960413102 1,128,455 -35,829 -3.08 140,684 1.14 0.0078
2023-08-14 2023-06-30 13F WESTLAKE COM 960413102 1,164,284 20,212 1.77 139,097 4.83 0.0073
2023-05-15 2023-03-31 13F WESTLAKE COM 960413102 1,144,072 19,052 1.69 132,689 15.02 0.0075
2023-05-15 2022-12-31 13F/A-99 WESTLAKE COM 960413102 1,125,020 379,282 50.86 115,360 78.05 0.0068
2023-05-15 2022-12-31 13F WESTLAKE COM 960413102 1,125,020 379,282 115,360 0.0068
2022-11-15 2022-09-30 13F WESTLAKE COM 960413102 745,738 38,195 5.40 64,790 -6.58 0.0041
2022-08-15 2022-06-30 13F WESTLAKE COM 960413102 707,543 168,840 31.34 69,353 4.33 0.0042
2022-05-16 2022-03-31 13F WESTLAKE COM 960413102 538,703 16,281 3.12 66,476 31.01 0.0033
2022-02-14 2021-12-31 13F WESTLAKE CHEM COM 960413102 522,422 4,970 0.96 50,743 7.60 0.0024
2021-11-15 2021-09-30 13F WESTLAKE CHEM COM 960413102 517,452 -1,082 -0.21 47,161 0.95 0.0025
2021-08-16 2021-06-30 13F WESTLAKE CHEM COM 960413102 518,534 64,902 14.31 46,715 15.98 0.0025
2021-07-09 2021-03-31 13F/A-1 WESTLAKE CHEM COM 960413102 453,632 3,424 0.76 40,278 9.64 0.0023
2021-05-17 2021-03-31 13F WESTLAKE CHEM COM 960413102 453,632 3,424 40,278 0.0023
2021-02-16 2020-12-31 13F WESTLAKE CHEM COM 960413102 450,208 -4,551 -1.00 36,737 27.78 0.0022
2020-11-10 2020-09-30 13F WESTLAKE CHEM COM 960413102 454,759 -34,685 -7.09 28,750 9.49 0.0020
2020-08-14 2020-06-30 13F WESTLAKE CHEM COM 960413102 489,444 -422,409 -46.32 26,259 -24.55 0.0019
2020-06-19 2020-03-31 13F/A-1 WESTLAKE CHEM COM 960413102 911,853 -6,551 -0.71 34,805 -45.98 0.0030
2020-05-11 2020-03-31 13F WESTLAKE CHEM COM 960413102 911,853 -6,551 34,805 3,056.5798
2020-02-06 2019-12-31 13F WESTLAKE CHEM COM 960413102 918,404 -12,015 -1.29 64,426 5.68 0.0044
2019-11-14 2019-09-30 13F WESTLAKE CHEM COM 960413102 930,419 6,459 0.70 60,961 -5.01 0.0045
2019-08-14 2019-06-30 13F WESTLAKE CHEM COM 960413102 923,960 -3,923 -0.42 64,178 1.92 0.0048
2019-05-15 2019-03-31 13F WESTLAKE CHEM COM 960413102 927,883 37,503 4.21 62,966 6.87 0.0049
2019-02-12 2018-12-31 13F WESTLAKE CHEM COM 960413102 890,380 27,084 3.14 58,916 -17.88 0.0054
2018-11-09 2018-09-30 13F WESTLAKE CHEMICAL Common equity shares 960413102 863,296 108,681 14.40 71,746 -11.66 0.0055
2018-08-14 2018-06-30 13F WESTLAKE CHEMICAL Common equity shares 960413102 754,615 238,608 46.24 81,217 41.60 0.0068
2018-05-15 2018-03-31 13F WESTLAKE CHEMICAL Common equity shares 960413102 516,007 -36,706 -6.64 57,355 -2.59 0.0049
2018-02-14 2017-12-31 13F WESTLAKE CHEMICAL Common equity shares 960413102 552,713 -11,614 -2.06 58,882 25.57 0.0047
2017-11-14 2017-09-30 13F WESTLAKE CHEMICAL Common equity shares 960413102 564,327 -11,047 -1.92 46,893 23.09 0.0040
2017-08-14 2017-06-30 13F WESTLAKE CHEMICAL Common equity shares 960413102 575,374 32,736 6.03 38,095 6.28 0.0034
2017-05-15 2017-03-31 13F WESTLAKE CHEMICAL Common equity shares 960413102 542,638 -13,914 -2.50 35,845 15.04 0.0032
2017-02-09 2016-12-31 13F WESTLAKE CHEMICAL Common equity shares 960413102 556,552 -3,772 -0.67 31,159 3.94 0.0029
2017-01-13 2016-09-30 13F/A-1 WESTLAKE CHEMICAL Common equity shares 960413102 560,324 44,651 8.66 29,977 35.42 0.0030
2016-11-14 2016-09-30 13F WESTLAKE CHEMICAL Common equity shares 960413102 560,224 29,972
2016-08-12 2016-06-30 13F WESTLAKE CHEMICAL Common equity shares 960413102 515,673 -322,568 -38.48 22,136 -42.97 0.0024
2016-05-20 2016-03-31 13F/A-1 WESTLAKE CHEMICAL Common equity shares 960413102 838,241 44,280 5.58 38,812 -10.00 0.0042
2016-05-12 2016-03-31 13F WESTLAKE CHEMICAL Common equity shares 960413102 838,241 38,812
2016-02-16 2015-12-31 13F WESTLAKE CHEMICAL Common equity shares 960413102 793,961 -55,721 -6.56 43,125 -2.19 0.0047
2015-11-16 2015-09-30 13F WESTLAKE CHEMICAL Common equity shares 960413102 849,682 49,490 6.18 44,090 -19.67 0.0051
2015-08-13 2015-06-30 13F WESTLAKE CHEMICAL Common equity shares 960413102 800,192 24,056 3.10 54,886 -1.71 0.0059
2015-05-15 2015-03-31 13F WESTLAKE CHEMICAL Common equity shares 960413102 776,136 19,456 2.57 55,840 20.80 0.0057
2015-02-11 2014-12-31 13F WESTLAKE CHEMICAL Common equity shares 960413102 756,680 -21,474 -2.76 46,224 -31.40 0.0046
2014-11-12 2014-09-30 13F/A-1 WESTLAKE CHEMICAL Common equity shares 960413102 778,154 57,697 8.01 67,378 11.63 0.0072
2014-11-10 2014-09-30 13F WESTLAKE CHEMICAL Common equity shares 960413102 778,154 67,378
2014-08-12 2014-06-30 13F WESTLAKE CHEMICAL Common equity shares 960413102 720,457 237,483 49.17 60,358 88.84 0.0065
2014-05-15 2014-03-31 13F/A-1 WESTLAKE CHEMICAL Common equity shares 960413102 482,974 246,366 104.12 31,962 10.67 0.0036
2014-05-13 2014-03-31 13F WESTLAKE CHEMICAL Common equity shares 960413102 483,374 31,988
2014-02-06 2013-12-31 13F/A-1 WESTLAKE CHEMICAL Common equity shares 960413102 236,608 -169,511 -41.74 28,881 -32.05 0.0032
2014-02-06 2013-12-31 13F WESTLAKE CHEMICAL Common equity shares 960413102 236,652 18,768
2013-11-12 2013-09-30 13F WESTLAKE CHEMICAL Common equity shares 960413102 406,119 145,249 55.68 42,503 69.02 0.0052
2013-08-08 2013-06-30 13F WESTLAKE CHEMICAL Common equity shares 960413102 260,870 260,870 25,147 0.0033
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.