Was the Westlake (WLK) CFO’s share sale an open-market transaction?

Yes. The filing classifies the transaction as an open-market sale of common stock, coded as “S” on Form 4. That code indicates a sale executed on the market or in a private sale, rather than a grant, option exercise, or tax withholding event.

What price range applied to the Westlake (WLK) CFO’s share sale?

The filing notes that the 16,413 shares were sold in multiple trades at prices ranging from $112.33 to $112.99. The reported transaction price of $112.535 per share represents the weighted average across all these individual trades in the disclosed range.

Westlake (NYSE: WLK) CFO sells 16,413 shares in open-market trade

Filing Impact

(Very High)

Filing Sentiment

(Negative)

Form Type

Rhea-AI Filing Summary

Westlake Corp EVP & CFO Mark Steven Bender reported an open-market sale of 16,413 shares of Westlake common stock on March 27, 2026. The shares were sold at a weighted average price of $112.535, with individual trade prices ranging from $112.33 to $112.99. After this transaction, he directly holds 28,015 shares of Westlake common stock.

Insider Trade Summary

Net Seller: 16,413 shares ($1,847,037)

Net Sell 1 txn

Insider Bender Mark Steven

Role EVP & CFO

Sold 16,413 shs ($1.85M)

Type	Security	Shares	Price	Value
Sale	Common Stock	16,413	$112.535	$1.85M

Holdings After Transaction: Common Stock — 28,015 shares (Direct)

Footnotes (1)

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Key Figures

Shares sold: 16,413 shares Weighted average sale price: $112.535 per share Price range of trades: $112.33–$112.99 per share +1 more

4 metrics

Shares sold 16,413 shares Open-market sale on March 27, 2026

Weighted average sale price $112.535 per share Common stock sale on March 27, 2026

Price range of trades $112.33–$112.99 per share Range of individual sale transactions

Shares held after transaction 28,015 shares Direct ownership following the sale

Key Terms

open-market sale, weighted average price, Common Stock, Form 4

4 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.

weighted average price financial

"Weighted average price. These shares were sold in multiple transactions"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

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.

Form 4 regulatory

"This insider transaction was reported on Form 4"

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

Form 4 Insider Transactions: What Each Field Means →

03/30/2026 - 04:10 PM

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^*

Bender Mark Steven

(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 & CFO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/27/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	03/27/2026		S		16,413	D	$112.535⁽¹⁾	28,015	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. Weighted average price. These shares were sold in multiple transactions at prices ranging from $112.33 to $112.99 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.

	M. Steven Bender by J Feng POA	03/30/2026
	** 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)

Source: View Original Filing on SEC EDGAR

FAQ

What insider transaction did Westlake (WLK) disclose for Mark Steven Bender?

Westlake reported that EVP & CFO Mark Steven Bender sold 16,413 shares of common stock in an open-market transaction. The sale was reported on Form 4 and reflects a routine insider disposition rather than a new share issuance by the company.

How many Westlake (WLK) shares did the CFO sell and at what price?

The CFO sold 16,413 shares of Westlake common stock at a weighted average price of $112.535 per share. According to the disclosure, individual trades occurred within a price range from $112.33 to $112.99 during the transaction.

How many Westlake (WLK) shares does the CFO still hold after the sale?

Following the reported transaction, EVP & CFO Mark Steven Bender directly holds 28,015 shares of Westlake common stock. This post-transaction holding figure is explicitly disclosed in the filing and helps show his remaining equity stake in the company.