웨스트레이크 코퍼레이션
DE ˙ DB ˙ US9604131022
€74.44 ↑1.62 (2.22%)
2026-06-05
주가
SecurityDE:UEO / Westlake Corporation
InstitutionJanus Henderson Group Plc
Latest Disclosed Ownership269,783 shares
Latest Disclosed Value $ 31,517,599
Janus Henderson Group Plc reports 19.37% decrease in ownership of UEO / Westlake Corporation

On May 18, 2026 - Janus Henderson Group Plc filed a 13F-HR/A form disclosing ownership of 269,783 shares of Westlake Corporation (DE:UEO) valued at $27,248,083 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 334,593 shares of Westlake Corporation. This represents a change in shares of -19.37% during the quarter. The current value of the position is $20,082,647 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)
2026-05-18 2026-03-31 13F/A-1 WESTLAKE COM 960413102 269,783 -64,810 -19.37 31,518 27.39 0.0150
2026-05-15 2026-03-31 13F WESTLAKE COM 960413102 269,783 -64,810 31,518 0.0058
2026-02-17 2025-12-31 13F WESTLAKE COM 960413102 334,593 -31,391 -8.58 24,741 -12.28 0.0111
2025-11-14 2025-09-30 13F WESTLAKE COM 960413102 365,984 151,703 70.80 28,203 73.34 0.0129
2025-08-14 2025-06-30 13F WESTLAKE COM 960413102 214,281 -180,240 -45.69 16,270 -58.39 0.0080
2025-05-15 2025-03-31 13F WESTLAKE COM 960413102 394,521 22,325 6.00 39,105 -8.36 0.0214
2025-02-14 2024-12-31 13F WESTLAKE COM 960413102 372,196 170,791 84.80 42,672 40.98 0.0217
2024-11-14 2024-09-30 13F WESTLAKE COM 960413102 201,405 91,973 84.05 30,269 91.01 0.0155
2024-08-14 2024-06-30 13F WESTLAKE COM 960413102 109,432 228 0.21 15,848 -5.03 0.0085
2024-05-15 2024-03-31 13F WESTLAKE COM 960413102 109,204 -63,235 -36.67 16,686 -30.86 0.0091
2024-02-14 2023-12-31 13F WESTLAKE COM 960413102 172,439 -33,175 -16.13 24,135 -5.85 0.0144
2023-11-14 2023-09-30 13F WESTLAKE COM 960413102 205,614 59,040 40.28 25,634 46.38 0.0168
2023-08-14 2023-06-30 13F WESTLAKE COM 960413102 146,574 -49,055 -25.08 17,511 -22.82 0.0109
2023-05-15 2023-03-31 13F WESTLAKE COM 960413102 195,629 -31,946 -14.04 22,689 -2.77 0.0150
2023-02-14 2022-12-31 13F WESTLAKE COM 960413102 227,575 -72,048 -24.05 23,336 -10.36 0.0167
2023-01-13 2022-09-30 13F/A-1 WESTLAKE COM 960413102 299,623 16,512 5.83 26,031 -6.20 0.0195
2022-11-14 2022-09-30 13F WESTLAKE COM 960413102 299,623 16,512 26,031 0.0195
2022-08-15 2022-06-30 13F WESTLAKE COM 960413102 283,111 -52,828 -15.73 27,751 -33.06 0.0191
2022-05-16 2022-03-31 13F WESTLAKE COM 960413102 335,939 -120,912 -26.47 41,456 -6.58 0.0200
2022-02-14 2021-12-31 13F WESTLAKE CHEM COM 960413102 456,851 -113,736 -19.93 44,374 -14.67 0.0185
2021-11-16 2021-09-30 13F WESTLAKE CHEM COM 960413102 570,587 286,004 100.50 52,003 102.84 0.0227
2021-08-16 2021-06-30 13F WESTLAKE CHEM COM 960413102 284,583 -3,691 -1.28 25,638 0.16 0.0110
2021-05-17 2021-03-31 13F WESTLAKE CHEM COM 960413102 288,274 6,081 2.15 25,596 11.16 0.0117
2021-02-16 2020-12-31 13F WESTLAKE CHEM COM 960413102 282,193 -185,113 -39.61 23,027 -22.06 0.0107
2020-11-16 2020-09-30 13F WESTLAKE CHEM COM 960413102 467,306 -154,230 -24.81 29,543 -11.40 0.0154
2020-08-14 2020-06-30 13F WESTLAKE CHEM COM 960413102 621,536 -82,257 -11.69 33,345 24.13 0.0187
2020-05-14 2020-03-31 13F WESTLAKE CHEM COM 960413102 703,793 -35,176 -4.76 26,864 -48.18 0.0185
2020-02-18 2019-12-31 13F WESTLAKE CHEM COM 960413102 738,969 2,532 0.34 51,839 7.44 0.0265
2019-11-14 2019-09-30 13F WESTLAKE CHEM COM 960413102 736,437 74,556 11.26 48,251 4.95 0.0261
2019-07-31 2019-06-30 13F WESTLAKE CHEM COM 960413102 661,881 629,057 1,916.45 45,974 1,964.39 0.0250
2019-04-30 2019-03-31 13F WESTLAKE CHEM COM 960413102 32,824 2,443 8.04 2,227 10.80 0.0012
2019-02-06 2018-12-31 13F WESTLAKE CHEM COM 960413102 30,381 -294,881 -90.66 2,010 -92.56 0.0013
2018-11-09 2018-09-30 13F WESTLAKE CHEM COM 960413102 325,262 -108,779 -25.06 27,033 -42.13 0.0144
2018-08-10 2018-06-30 13F WESTLAKE CHEM COM 960413102 434,041 -77,081 -15.08 46,716 -17.77 0.0266
2018-05-14 2018-03-31 13F WESTLAKE CHEM COM 960413102 511,122 41,403 8.81 56,811 13.53 0.0335
2018-03-12 2017-12-31 13F/A-1 WESTLAKE CHEM COM 960413102 469,719 -383,819 -44.97 50,039 -29.44 0.0308
2018-02-09 2017-12-31 13F WESTLAKE CHEM COM 960413102 469,719 -383,819 50,039
2017-11-14 2017-09-30 13F WESTLAKE CHEM COM 960413102 853,538 -512,451 -37.52 70,920 -21.59 0.0455
2017-08-17 2017-06-30 13F/A-1 WESTLAKE CHEM COM 960413102 1,365,989 1,365,989 90,442 0.0616
2017-08-14 2017-06-30 13F WESTLAKE CHEM COM 960413102 1,365,989 1,365,989 90,442
2016-05-12 2016-03-31 13F WESTLAKE CHEM COM 960413102 0 0 0 0.0000
2015-08-17 2015-06-30 13F WESTLAKE CHEM COM 960413102 0 -8,010 -100.00 0 -100.00
2015-06-02 2015-03-31 13F/A-1 WESTLAKE CHEM COM 960413102 8,010 0 0.00 576 17.79 0.0044
2015-05-15 2015-03-31 13F WESTLAKE CHEM COM 960413102 8,010 576
2015-02-12 2014-12-31 13F WESTLAKE CHEM COM 960413102 8,010 0 0.00 489 -29.54 0.0035
2014-11-12 2014-09-30 13F WESTLAKE CHEM COM 960413102 8,010 0 0.00 694 3.43 0.0065
2014-08-13 2014-06-30 13F WESTLAKE CHEM COM 960413102 8,010 8,010 671 0.0063
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.