Westlake Corporation
DE ˙ DB ˙ US9604131022
€74,44 ↑1,62 (2,22%)
2026-06-05
HİSSE FİYATI
SecurityDE:UEO / Westlake Corporation
InstitutionBlackRock, Inc.
Latest Disclosed Ownership3,079,087 shares
Latest Disclosed Value $ 359,698,953
BlackRock, Inc. reports 5.59% decrease in ownership of UEO / Westlake Corporation

On May 13, 2026 - BlackRock, Inc. filed a 13F-HR form disclosing ownership of 3,079,087 shares of Westlake Corporation (DE:UEO) valued at $310,987,787 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 3,261,433 shares of Westlake Corporation. This represents a change in shares of -5.59% during the quarter. The current value of the position is $229,207,236 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)
2026-05-13 2026-03-31 13F WESTLAKE COM 960413102 3,079,087 -182,346 -5.59 359,699 49.16 0.0005
2026-02-12 2025-12-31 13F WESTLAKE COM 960413102 3,261,433 75,697 2.38 241,150 -1.77 0.0041
2025-11-12 2025-09-30 13F WESTLAKE COM 960413102 3,185,736 -142,960 -4.29 245,493 -2.87 0.0043
2025-08-12 2025-06-30 13F WESTLAKE COM 960413102 3,328,696 -331,710 -9.06 252,748 -30.97 0.0048
2025-05-02 2025-03-31 13F WESTLAKE COM 960413102 3,660,406 2,511 0.07 366,150 -12.69 0.0077
2025-02-07 2024-12-31 13F WESTLAKE COM 960413102 3,657,895 160,039 4.58 419,378 -20.22 0.0085
2024-11-13 2024-09-30 13F WESTLAKE COM 960413102 3,497,856 89,852 2.64 525,693 6.51 0.0110
2024-08-13 2024-06-30 13F WESTLAKE COM 960413102 3,408,004 -71,816 -2.06 493,547 -7.18 0.0112
2024-05-10 2024-03-31 13F WESTLAKE COM 960413102 3,479,820 -65,338 -1.84 531,717 7.16 0.0124
2024-02-13 2023-12-31 13F WESTLAKE COM 960413102 3,545,158 25,529 0.73 496,180 13.08 0.0127
2023-11-13 2023-09-30 13F WESTLAKE COM 960413102 3,519,629 -283,621 -7.46 438,792 -3.43 0.0126
2023-08-11 2023-06-30 13F WESTLAKE COM 960413102 3,803,250 236,332 6.63 454,374 9.83 0.0125
2023-05-12 2023-03-31 13F WESTLAKE COM 960413102 3,566,918 -27,942 -0.78 413,691 12.23 0.0122
2023-02-13 2022-12-31 13F WESTLAKE COM 960413102 3,594,860 1,373,077 61.80 368,617 90.96 0.0115
2022-11-14 2022-09-30 13F WESTLAKE COM 960413102 2,221,783 150,636 7.27 193,029 -4.92 0.0066
2022-08-12 2022-06-30 13F WESTLAKE COM 960413102 2,071,147 512,042 32.84 203,014 5.52 0.0065
2022-05-12 2022-03-31 13F WESTLAKE COM 960413102 1,559,105 -160,676 -9.34 192,395 15.18 0.0052
2022-02-10 2021-12-31 13F WESTLAKE CHEM COM 960413102 1,719,781 62,328 3.76 167,041 10.58 0.0043
2021-11-09 2021-09-30 13F WESTLAKE CHEM COM 960413102 1,657,453 -28,494 -1.69 151,061 -0.55 0.0042
2021-08-11 2021-06-30 13F WESTLAKE CHEM COM 960413102 1,685,947 -42,575 -2.46 151,889 -1.03 0.0042
2021-05-07 2021-03-31 13F WESTLAKE CHEM COM 960413102 1,728,522 168,049 10.77 153,475 20.53 0.0045
2021-02-05 2020-12-31 13F WESTLAKE CHEM COM 960413102 1,560,473 12,759 0.82 127,334 30.13 0.0041
2020-11-06 2020-09-30 13F WESTLAKE CHEM COM 960413102 1,547,714 -57,245 -3.57 97,849 13.64 0.0036
2020-08-14 2020-06-30 13F WESTLAKE CHEM COM 960413102 1,604,959 -340,003 -17.48 86,106 15.99 0.0034
2020-05-01 2020-03-31 13F WESTLAKE CHEM COM 960413102 1,944,962 -69,432 -3.45 74,237 -47.46 0.0036
2020-02-13 2019-12-31 13F WESTLAKE CHEM COM 960413102 2,014,394 53,448 2.73 141,308 9.98 0.0054
2019-11-08 2019-09-30 13F WESTLAKE CHEM COM 960413102 1,960,946 -31,988 -1.61 128,482 -7.19 0.0054
2019-08-22 2019-06-30 13F/A-1 WESTLAKE CHEM COM 960413102 1,992,934 -5,017 -0.25 138,429 2.10 0.0059
2019-08-13 2019-06-30 13F WESTLAKE CHEM COM 960413102 1,992,934 -5,017 138,429
2019-05-09 2019-03-31 13F WESTLAKE CHEM COM 960413102 1,997,951 -30,202 -1.49 135,583 1.03 0.0061
2019-02-08 2018-12-31 13F WESTLAKE CHEM COM 960413102 2,028,153 -53,154 -2.55 134,202 -22.42 0.0068
2018-11-09 2018-09-30 13F WESTLAKE CHEM COM 960413102 2,081,307 147,877 7.65 172,977 -16.88 0.0075
2018-08-09 2018-06-30 13F WESTLAKE CHEM COM 960413102 1,933,430 398,951 26.00 208,094 22.01 0.0096
2018-05-09 2018-03-31 13F WESTLAKE CHEM COM 960413102 1,534,479 -20,921 -1.35 170,556 2.93 0.0082
2018-02-09 2017-12-31 13F WESTLAKE CHEM COM 960413102 1,555,400 108,434 7.49 165,696 37.82 0.0079
2017-11-14 2017-09-30 13F WESTLAKE CHEM COM 960413102 1,446,966 -206,419 -12.48 120,228 9.83 0.0061
2017-08-10 2017-06-30 13F WESTLAKE CHEM COM 960413102 1,653,385 -46,230 -2.72 109,468 -2.49 0.0058
2017-05-12 2017-03-31 13F WESTLAKE CHEM COM 960413102 1,699,615 1,687,768 14,246.37 112,260 16,832.13 0.0062
2017-02-10 2016-12-31 13F WESTLAKE CHEM COM 960413102 11,847 -857 -6.75 663 -2.50 0.0009
2016-11-08 2016-09-30 13F WESTLAKE CHEM COM 960413102 12,704 -81,189 -86.47 680 -83.13 0.0010
2016-08-10 2016-06-30 13F WESTLAKE CHEM COM 960413102 93,893 59,414 172.32 4,030 152.51 0.0061
2016-05-10 2016-03-31 13F WESTLAKE CHEM COM 960413102 34,479 1,048 3.13 1,596 -12.11 0.0026
2016-02-11 2015-12-31 13F WESTLAKE CHEM COM 960413102 33,431 8,831 35.90 1,816 42.32 0.0027
2015-11-13 2015-09-30 13F WESTLAKE CHEM COM 960413102 24,600 1,683 7.34 1,276 -18.83 0.0020
2015-08-07 2015-06-30 13F WESTLAKE CHEM COM 960413102 22,917 -187 -0.81 1,572 -5.42 0.0023
2015-05-13 2015-03-31 13F WESTLAKE CHEM COM 960413102 23,104 2,187 10.46 1,662 30.05 0.0023
2015-02-09 2014-12-31 13F WESTLAKE CHEM COM 960413102 20,917 4,095 24.34 1,278 -12.29 0.0018
2014-10-29 2014-09-30 13F WESTLAKE CHEM COM 960413102 16,822 -5,413 -24.34 1,457 -21.79 0.0021
2014-08-06 2014-06-30 13F WESTLAKE CHEM COM 960413102 22,235 -60,844 -73.24 1,863 -66.11 0.0028
2014-05-02 2014-03-31 13F WESTLAKE CHEM COM 960413102 83,079 -30,781 -27.03 5,498 -60.44 0.0089
2014-02-12 2013-12-31 13F WESTLAKE CHEM COM 960413102 113,860 77,901 216.64 13,899 269.36 0.0227
2013-11-12 2013-09-30 13F WESTLAKE CHEM COM 960413102 35,959 -30,012 -45.49 3,763 -40.83 0.0071
2013-08-13 2013-06-30 13F WESTLAKE CHEM COM 960413102 65,971 65,971 6,360 0.0126
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.