Westlake EVP sells 4,000 shares in open market

Westlake Corp executive vice president Robert F. Buesinger sold 4,000 shares of Common Stock in an open-market transaction at $115.25 per share.

Rhea-AI Filing Summary

Westlake Corp executive vice president Robert F. Buesinger sold 4,000 shares of Common Stock in an open-market transaction at $115.25 per share. Following this sale, he holds 34,482 Westlake shares directly.

Insights

Equity analyst

Westlake EVP’s 4,000-share open-market sale looks like a moderate, routine disposition.

Executive vice president Robert F. Buesinger sold 4,000 Westlake Corp common shares at $115.25 each in an open-market transaction. After the sale, he still directly owns 34,482 shares, indicating he retains a substantial equity stake.

The filing shows no derivative exercises or tax-related dispositions, so this is a straightforward sale rather than part of an option exercise pattern. With meaningful holdings remaining, the transaction appears as portfolio diversification or liquidity rather than an exit signal based on the available information.

Insider Trade Summary

Net Seller: 4,000 shares

Net Sell 1 txn

Insider Buesinger Robert F.

Role EVP, PEM Segment Head

Sold 4,000 shs ($461K)

Type	Security	Shares	Price	Value
Sale	Common Stock	4,000	$115.25	$461K

Holdings After Transaction: Common Stock — 34,482 shares (Direct)

Key Figures

Shares sold: 4,000 shares Sale price: $115.25 per share Shares owned after transaction: 34,482 shares

3 metrics

Shares sold 4,000 shares Open-market sale of Westlake Common Stock

Sale price $115.25 per share Execution price for the 4,000-share sale

Shares owned after transaction 34,482 shares Direct holdings after the reported sale

Key Terms

open-market sale, Common Stock, direct ownership

3 terms

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Common Stock financial

""security_title": "Common Stock""

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

direct ownership financial

""direct_or_indirect": "D" and "ownership_type": "direct""

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did Westlake (WLK) report for Robert F. Buesinger?

Westlake reported that executive vice president Robert F. Buesinger completed an open-market sale of 4,000 shares of the company’s Common Stock at $115.25 per share. This Form 4 filing records the details of that sale and his updated share ownership.

At what price did the Westlake (WLK) executive sell his shares?

Robert F. Buesinger sold his 4,000 Westlake Corp Common Stock shares at $115.25 per share. This price reflects the execution level of the open-market transaction as disclosed, not necessarily the full trading range for Westlake stock that day.

How many Westlake (WLK) shares does Robert F. Buesinger own after the sale?

Following the reported sale, Robert F. Buesinger directly owns 34,482 shares of Westlake Corp Common Stock. This post-transaction holding shows he maintains a significant ongoing equity position in the company despite the 4,000-share disposition.

Was the Westlake (WLK) insider transaction a buy or a sell?

The insider transaction reported was a sell. Robert F. Buesinger executed an open-market sale of 4,000 Westlake Corp Common Stock shares, as indicated by the transaction code “S” and the description specifying an open-market or private sale transaction.

Does the Westlake (WLK) Form 4 show any option exercises or derivatives?

The Form 4 data provided show only a non-derivative transaction in Common Stock and no derivative entries. The derivative summary is empty, indicating no reported option exercises, conversions, or other derivative-related transactions for this filing date.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 03/31/2026 - 09:48 AM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Buesinger Robert F.

(Last) (First) (Middle)

2801 POST OAK BLVD., STE. 600

(Street)

HOUSTON TEXAS 77056

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
WESTLAKE CORP [ WLK ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, PEM Segment Head

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/30/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	03/27/2026		S		4,000	D	$115.25	34,482	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

	Robert F. Buesinger by J Feng POA	03/31/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)