Westlake Corporation
US ˙ NYSE ˙ US9604131022

SecurityWLK / Westlake Corporation
InstitutionBessemer Group Inc
Latest Disclosed Ownership60 shares
Latest Disclosed Value $ 7
Bessemer Group Inc ownership in WLK / Westlake Corporation

On May 6, 2026 - Bessemer Group Inc filed a 13F-HR form disclosing ownership of 60 shares of Westlake Corporation (US:WLK) valued at $7,009 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 0 shares of Westlake Corporation. The current value of the position is $5,078 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)
2026-05-06 2026-03-31 13F WESTLAKE SC 960413102 60 60 0 0.0000
2026-02-05 2025-12-31 13F WESTLAKE SC 960413102 0 -97 -100.00 0 0.0000
2025-11-05 2025-09-30 13F WESTLAKE SC 960413102 97 54 125.58 0 0.0000
2025-08-01 2025-06-30 13F WESTLAKE SC 960413102 43 -108 -71.52 0 0.0000
2025-04-23 2025-03-31 13F WESTLAKE SC 960413102 151 34 29.06 0 0.0000
2025-02-13 2024-12-31 13F WESTLAKE SC 960413102 117 72 160.00 0 0.0000
2024-11-12 2024-09-30 13F WESTLAKE SC 960413102 45 16 55.17 0 0.0000
2024-08-13 2024-06-30 13F WESTLAKE SC 960413102 29 0 0.00 0 0.0000
2024-08-13 2024-03-31 13F/A-1 WESTLAKE SC 960413102 29 0 0.00 0 0.0000
2024-05-13 2024-03-31 13F WESTLAKE SC 960413102 29 0 0 0.0000
2024-02-09 2023-12-31 13F WESTLAKE SC 960413102 29 0 0.00 0 0.0000
2023-11-13 2023-09-30 13F WESTLAKE SC 960413102 29 0 0.00 0 0.0000
2023-08-10 2023-06-30 13F WESTLAKE SC 960413102 29 29 0 0.0000
2022-11-09 2022-09-30 13F WESTLAKE SC 960413102 0 -138 -100.00 0 -100.00
2022-08-10 2022-06-30 13F WESTLAKE SC 960413102 138 113 452.00 13 333.33 0.0000
2022-05-12 2022-03-31 13F WESTLAKE SC 960413102 25 25 3 0.0000
2020-04-30 2020-03-31 13F WESTLAKE CHEM CORP COM SC 960413102 0 -57 -100.00 0 -100.00
2020-02-04 2019-12-31 13F WESTLAKE CHEM CORP COM SC 960413102 57 57 4 0.0000
2019-05-13 2019-03-31 13F WESTLAKE CHEM CORP COM SC 960413102 0 -178 -100.00 0 -100.00
2019-05-21 2018-12-31 13F/A-1 WESTLAKE CHEM CORP COM SC 960413102 178 -142 -44.38 12 -53.85 0.0001
2019-02-12 2018-12-31 13F WESTLAKE CHEM CORP COM SC 960413102 178 -142 12 0.0001
2018-11-06 2018-09-30 13F WESTLAKE CHEM CORP COM SC 960413102 320 175 120.69 26 62.50 0.0001
2018-07-25 2018-06-30 13F WESTLAKE CHEM CORP COM SC 960413102 145 -4 -2.68 16 -5.88 0.0001
2018-05-10 2018-03-31 13F WESTLAKE CHEM CORP COM SC 960413102 149 100 204.08 17 240.00 0.0001
2018-01-30 2017-12-31 13F WESTLAKE CHEM CORP COM SC 960413102 49 49 5 0.0000
2017-07-27 2017-06-30 13F WESTLAKE CHEM CORP COM SC 960413102 0 -737 -100.00 0 -100.00
2017-05-12 2017-03-31 13F WESTLAKE CHEM CORP COM SC 960413102 737 37 5.29 49 25.64 0.0002
2017-02-07 2016-12-31 13F WESTLAKE CHEM CORP COM SC 960413102 700 0 0.00 39 5.41 0.0002
2016-11-10 2016-09-30 13F WESTLAKE CHEM CORP COM SC 960413102 700 0 0.00 37 23.33 0.0002
2016-08-11 2016-06-30 13F WESTLAKE CHEM CORP COM SC 960413102 700 700 30 0.0002
2016-05-11 2016-03-31 13F WESTLAKE CHEMICAL SC 960413102 0 -24,838 -100.00 0 -100.00
2016-02-12 2015-12-31 13F WESTLAKE CHEMICAL SC 960413102 24,838 0 0.00 1,349 4.65 0.0075
2015-11-16 2015-09-30 13F WESTLAKE CHEMICAL SC 960413102 24,838 11,749 89.76 1,289 43.54 0.0074
2015-08-14 2015-06-30 13F WESTLAKE CHEMICAL SC 960413102 13,089 0 0.00 898 -4.57 0.0047
2015-06-18 2015-03-31 13F/A-1 WESTLAKE CHEMICAL SC 960413102 13,089 2,489 23.48 941 45.22 0.0048
2015-05-14 2015-03-31 13F WESTLAKE CHEMICAL SC 960413102 13,089 941
2015-02-17 2014-12-31 13F WESTLAKE CHEMICAL SC 960413102 10,600 10,600 648 0.0035
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.