Mark Steven Bender - 27 Feb 2026 Form 4 Insider Report for WESTLAKE CORP (WLK)

Role
EVP & CFO
Signature
M. Steven Bender by J Feng POA
Issuer symbol
WLK
Transactions as of
27 Feb 2026
Net transactions value
-$2,033,501
Form type
4
Filing time
02 Mar 2026, 11:35:03 UTC
Previous filing
23 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Bender Mark Steven EVP & CFO 2801 POST OAK BLVD., STE. 600, HOUSTON M. Steven Bender by J Feng POA 02 Mar 2026 0001330417

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction WLK Common Stock Options Exercise $407,972 +6,199 +10% $65.81 68,041 27 Feb 2026 Direct
transaction WLK Common Stock Options Exercise $561,977 +6,494 +9.5% $86.54 74,535 27 Feb 2026 Direct
transaction WLK Common Stock Disposed to Issuer $1,246,453 -12,693 -17% $98.20 61,842 27 Feb 2026 Direct
transaction WLK Common Stock Sale $1,714,259 -16,988 -27% $100.91 44,854 27 Feb 2026 Direct F1
transaction WLK Common Stock Sale $42,738 -421 -0.94% $101.52 44,433 27 Feb 2026 Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction WLK Employee Option (right to buy) Options Exercise $0 -6,199 -100% $0.000000 0 27 Feb 2026 Common Stock 6,199 $65.81 Direct F2
transaction WLK Employee Option (right to buy) Options Exercise $0 -6,494 -100% $0.000000 0 27 Feb 2026 Common Stock 6,494 $86.54 Direct F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Weighted average price. These shares were sold in multiple transactions at prices ranging from $100.38 to $101.36 inclusive. The reporting person undertakes to provide the issuer, any security holder of the issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth above.
F2 The stock options are exercisable in three installments of 33%. 33% and 34% on February 14, 2021, 2022 and 2023, respectively.
F3 The stock options are exercisable in three installments of 33%, 33% and 34% on February 19, 2022, 2023 and 2024, respectively.