Robert F. Buesinger - 17 Feb 2026 Form 4 Insider Report for WESTLAKE CORP (WLK)

Role
EVP, PEM Segment Head
Signature
Robert F. Buesinger by J Feng POA
Issuer symbol
WLK
Transactions as of
17 Feb 2026
Net transactions value
-$89,352
Form type
4
Filing time
19 Feb 2026, 15:18:55 UTC
Previous filing
09 Jun 2025
Next filing
23 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Buesinger Robert F. EVP, PEM Segment Head 2801 POST OAK BLVD., STE. 600, HOUSTON Robert F. Buesinger by J Feng POA 19 Feb 2026 0001488587

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction WLK Common Stock Options Exercise $0 +3,478 +10% $0.000000 38,410 17 Feb 2026 Direct F1
transaction WLK Common Stock Tax liability $89,352 -903 -2.4% $98.95 37,507 18 Feb 2026 Direct F3

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 Restricted Stock Units Options Exercise $0 -3,478 -100% $0.000000 0 17 Feb 2026 Common Stock 3,478 Direct F1, F2
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Restricted stock units ("RSUs") convert into the Issuer's common stock on a one-for-one basis.
F2 On February 17, 2023, the reporting person was granted 3,478 RSUs vesting on the third anniversay of the grant date.
F3 Shares otherwise issuable were withheld to satisfy tax obligations arising out of the vesting of the reporting persons RSUs.