Westlake Corporation
US ˙ NYSE ˙ US9604131022

SecurityWLK / Westlake Corporation
InstitutionStandard Life Aberdeen plc
Latest Disclosed Ownership0 shares
Latest Disclosed Value $ 0
Standard Life Aberdeen plc closes position in WLK / Westlake Corporation

On November 7, 2025 - Standard Life Aberdeen plc filed a 13F-HR form disclosing ownership of 0 shares of Westlake Corporation (US:WLK) valued at $0 USD as of September 30, 2025. The entity filed a previous 13F-HR on July 24, 2025 disclosing 10,098 shares of Westlake Corporation. The current value of the position is $0 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)
2025-11-07 2025-09-30 13F WESTLAKE COM 960413102 0 -100.00 0
2025-07-24 2025-06-30 13F WESTLAKE COM 960413102 10,098 97 0.97 767 -23.40 0.0013
2025-05-13 2025-03-31 13F WESTLAKE COM 960413102 10,001 10,001 1,000 0.0020
2024-08-09 2024-06-30 13F WESTLAKE COM 960413102 0 -10,984 -100.00 0 -100.00
2024-05-09 2024-03-31 13F WESTLAKE COM 960413102 10,984 -239 -2.13 1,678 6.88 0.0033
2024-01-31 2023-12-31 13F WESTLAKE COM 960413102 11,223 5,628 100.59 1,571 125.25 0.0034
2023-11-07 2023-09-30 13F WESTLAKE COM 960413102 5,595 -267 -4.55 698 -0.43 0.0018
2024-06-20 2023-06-30 13F/A-1 WESTLAKE COM 960413102 5,862 -141 -2.35 700 0.57 0.0016
2023-08-04 2023-06-30 13F WESTLAKE COM 960413102 5,862 -141 700 0.0016
2024-06-20 2023-03-31 13F/A-1 WESTLAKE COM 960413102 6,003 2,764 85.33 696 109.64 0.0017
2023-04-28 2023-03-31 13F WESTLAKE COM 960413102 6,003 2,764 696 0.0017
2024-06-20 2022-12-31 13F/A-1 WESTLAKE COM 960413102 3,239 191 6.27 332 25.76 0.0009
2023-02-10 2022-12-31 13F WESTLAKE COM 960413102 3,239 191 332 0.0009
2022-11-10 2022-09-30 13F WESTLAKE COM 960413102 3,048 698 29.70 264 15.28 0.0008
2022-08-05 2022-06-30 13F WESTLAKE COM 960413102 2,350 91 4.03 229 -18.21 0.0007
2022-05-04 2022-03-31 13F WESTLAKE COM 960413102 2,259 0 0.00 280 27.27 0.0007
2022-02-10 2021-12-31 13F/A-1 WESTLAKE CHEM COM 960413102 2,259 2,259 220 0.0005
2022-02-08 2021-12-31 13F WESTLAKE CHEM COM 960413102 2,259 2,259 220 0.0002
2021-08-10 2021-06-30 13F WESTLAKE CHEM COM 960413102 0 -2,333 -100.00 0 -100.00
2021-05-06 2021-03-31 13F WESTLAKE CHEM COM 960413102 2,333 2,333 207 0.0005
2020-05-13 2020-03-31 13F WESTLAKE CHEM COM 960413102 0 -4,927 -100.00 0 -100.00
2020-02-18 2019-12-31 13F WESTLAKE CHEM COM 960413102 4,927 -82 -1.64 346 5.49 0.0008
2019-11-13 2019-09-30 13F WESTLAKE CHEM COM 960413102 5,009 -34,293 -87.26 328 -87.99 0.0008
2019-08-13 2019-06-30 13F WESTLAKE CHEM COM 960413102 39,302 189 0.48 2,730 2.86 0.0061
2019-05-14 2019-03-31 13F WESTLAKE CHEM COM 960413102 39,113 2,769 7.62 2,654 12.31 0.0058
2019-02-12 2018-12-31 13F WESTLAKE CHEM COM 960413102 36,344 33,453 1,157.14 2,363 884.58 0.0056
2018-11-20 2018-09-30 13F/A-1 WESTLAKE CHEM COM 960413102 2,891 789 37.54 240 6.19 0.0004
2018-11-13 2018-09-30 13F WESTLAKE CHEM COM 960413102 2,891 789 240
2018-08-09 2018-06-30 13F WESTLAKE CHEM COM 960413102 2,102 2,102 226 0.0004
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.