John Tsung-Chen Chao - 17 Feb 2026 Form 4 Insider Report for WESTLAKE CORP (WLK)

Role
Director
Signature
John Chao by J Feng POA
Issuer symbol
WLK
Transactions as of
17 Feb 2026
Net transactions value
-$23,946
Form type
4
Filing time
19 Feb 2026, 15:19:23 UTC
Previous filing
06 Mar 2025
Next filing
23 Feb 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Chao John Tsung-chen Director 2801 POST OAK BLVD., STE. 600, HOUSTON John Chao by J Feng POA 19 Feb 2026 0001746472

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction WLK Common Stock Options Exercise $0 +570 +8.1% $0.000000 7,608 17 Feb 2026 Direct F1
transaction WLK Common Stock Tax liability $23,946 -242 -3% $98.95 7,766 18 Feb 2026 Direct F3, F4

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 -570 -100% $0.000000 0 17 Feb 2026 Common Stock 570 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 570 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.
F4 Following a reconciliation of the reporting person's ownership records, the balance includes 400 shares that were inadvertently omitted from the reporting person's prior Form 4s.