Westlake Corporation
US ˙ NYSE ˙ US9604131022

SecurityWLK / Westlake Corporation
InstitutionSignaturefd, Llc
Latest Disclosed Ownership1,148 shares
Latest Disclosed Value $ 134,109
Signaturefd, Llc reports 708.45% increase in ownership of WLK / Westlake Corporation

On April 7, 2026 - Signaturefd, Llc filed a 13F-HR form disclosing ownership of 1,148 shares of Westlake Corporation (US:WLK) valued at $134,109 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 20, 2026 disclosing 142 shares of Westlake Corporation. This represents a change in shares of 708.45% during the quarter. The current value of the position is $97,167 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-04-07 2026-03-31 13F WESTLAKE COM 960413102 1,148 1,006 708.45 134 1,240.00 0.0021
2026-01-20 2025-12-31 13F WESTLAKE COM 960413102 142 -312 -68.72 10 -70.59 0.0002
2025-10-21 2025-09-30 13F WESTLAKE COM 960413102 454 -186 -29.06 35 -29.17 0.0006
2025-07-16 2025-06-30 13F WESTLAKE COM 960413102 640 213 49.88 49 14.29 0.0008
2025-05-02 2025-03-31 13F WESTLAKE COM 960413102 427 239 127.13 43 100.00 0.0008
2025-02-10 2024-12-31 13F WESTLAKE COM 960413102 188 -74 -28.24 22 -46.15 0.0004
2024-10-21 2024-09-30 13F WESTLAKE COM 960413102 262 1 0.38 39 5.41 0.0007
2024-07-29 2024-06-30 13F WESTLAKE COM 960413102 261 62 31.16 38 23.33 0.0008
2024-05-03 2024-03-31 13F WESTLAKE COM 960413102 199 0 0.00 30 11.11 0.0006
2024-02-01 2023-12-31 13F WESTLAKE COM 960413102 199 42 26.75 28 42.11 0.0006
2023-11-03 2023-09-30 13F WESTLAKE COM 960413102 157 11 7.53 20 11.76 0.0005
2023-08-01 2023-06-30 13F WESTLAKE COM 960413102 146 7 5.04 17 6.25 0.0004
2023-04-28 2023-03-31 13F WESTLAKE COM 960413102 139 0 0.00 16 14.29 0.0004
2023-01-30 2022-12-31 13F WESTLAKE COM 960413102 139 -36 -20.57 14 -6.67 0.0004
2022-11-08 2022-09-30 13F WESTLAKE COM 960413102 175 -118 -40.27 15 -48.28 0.0005
2022-08-10 2022-06-30 13F WESTLAKE COM 960413102 293 -10 -3.30 29 -21.62 0.0010
2022-05-02 2022-03-31 13F WESTLAKE COM 960413102 303 161 113.38 37 164.29 0.0011
2022-01-25 2021-12-31 13F WESTLAKE CHEM COM 960413102 142 11 8.40 14 16.67 0.0004
2021-10-28 2021-09-30 13F WESTLAKE CHEM COM 960413102 131 55 72.37 12 71.43 0.0004
2021-07-26 2021-06-30 13F WESTLAKE CHEM COM 960413102 76 6 8.57 7 16.67 0.0003
2021-04-30 2021-03-31 13F WESTLAKE CHEM COM 960413102 70 0 0.00 6 0.00 0.0003
2021-02-11 2020-12-31 13F WESTLAKE CHEM COM 960413102 70 0 0.00 6 50.00 0.0003
2020-11-03 2020-09-30 13F WESTLAKE CHEM COM 960413102 70 0 0.00 4 0.00 0.0002
2020-07-30 2020-06-30 13F WESTLAKE CHEM COM 960413102 70 0 0.00 4 33.33 0.0002
2020-04-23 2020-03-31 13F WESTLAKE CHEM COM 960413102 70 70 3 0.0003
2020-02-05 2019-12-31 13F WESTLAKE CHEM COM 960413102 0 -20 -100.00 0 -100.00
2019-10-16 2019-09-30 13F WESTLAKE CHEM COM 960413102 20 -36 -64.29 1 -75.00 0.0001
2019-07-31 2019-06-30 13F WESTLAKE CHEM COM 960413102 56 -199 -78.04 4 -76.47 0.0003
2019-05-09 2019-03-31 13F WESTLAKE CHEM COM 960413102 255 -26 -9.25 17 -10.53 0.0014
2019-02-13 2018-12-31 13F WESTLAKE CHEM COM 960413102 281 281 19 0.0018
2015-04-15 2015-03-31 13F WESTLAKE CHEM COM 960413102 0 -7 -100.00 0 0.0000
2015-02-13 2014-12-31 13F WESTLAKE CHEM COM 960413102 7 0 0.00 0 -100.00
2014-11-13 2014-09-30 13F WESTLAKE CHEM COM 960413102 7 0 0.00 1 0.00 0.0003
2014-08-14 2014-06-30 13F WESTLAKE CHEM COM 960413102 7 7 1 0.0003
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.