Westlake Chemical Partners director exercises 5,005 units

Stephen G. Finley, a director of Westlake Chemical Partners GP LLC, exercised 5,005 phantom units, each economically equivalent to one common unit, into 5,005 Westlake Chemical Partners LP common units on August 6, 2026.

Accepted by SEC EDGAR 08/07/2026 - 07:32 AM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Stephen G. Finley, a director of Westlake Chemical Partners GP LLC, exercised 5,005 phantom units, each economically equivalent to one common unit, into 5,005 Westlake Chemical Partners LP common units on August 6, 2026. Following this conversion, he directly held 36,935 common units.

Insider Trade Summary

5,005 shares exercised/converted

Exercise 2 txns

Insider FINLEY G STEPHEN

Role Director

Type	Security	Shares	Price	Value
Exercise	Phantom Units F1	5,005	$0.00	$0.00
Exercise	Common Units F1	5,005	--	--

Holdings After Transaction: Phantom Units — 0 contracts (Direct); Common Units — 36,935 shares (Direct)

Footnotes (1)

1. F1. Each Phantom Unit is the economic equivalent of one Common Unit of the Issuer.

Key Figures

Phantom units converted: 5,005 units Common units acquired: 5,005 units Common units held after: 36,935 units

3 metrics

Phantom units converted 5,005 units Derivative exercise on 2026-08-06

Common units acquired 5,005 units Issued upon conversion of phantom units

Common units held after 36,935 units Direct ownership following reported transactions

Key Terms

Phantom Units, economic equivalent, derivative security

3 terms

Phantom Units financial

"Security title "Phantom Units"; each phantom unit is the economic equivalent..."

Phantom units are a form of employee compensation that mimics ownership in a company without issuing real shares: recipients receive cash or stock value tied to the company’s share price or performance when the units vest. They matter to investors because phantom units align employee incentives with shareholder value while avoiding share dilution; however, they create future cash obligations and can affect a company’s financial statements and cash flow.

economic equivalent financial

"Each Phantom Unit is the economic equivalent of one Common Unit of the Issuer."

derivative security financial

"Transaction code description "Exercise or conversion of derivative security""

A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.

FAQ

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What did Westlake Chemical Partners (WLKP) director Stephen G. Finley report in this Form 4?

Director Stephen G. Finley reported exercising 5,005 phantom units, which are economically equivalent to common units, into 5,005 common units of Westlake Chemical Partners LP on August 6, 2026, increasing his direct holdings to 36,935 common units.

How many Westlake Chemical Partners (WLKP) phantom units were converted and into what security?

Finley converted 5,005 phantom units into 5,005 common units. A footnote states that each phantom unit is the economic equivalent of one common unit, so the derivative position was fully transformed into an equal number of common units.

What is Stephen G. Finley’s direct common unit ownership in WLKP after the reported transactions?

After the reported conversion, Finley directly owns 36,935 common units of Westlake Chemical Partners LP. This figure reflects his position immediately following the exercise of 5,005 phantom units into an equal number of common units on August 6, 2026.

Were the WLKP transactions by Stephen G. Finley made under a Rule 10b5-1 trading plan?

The filing indicates the Rule 10b5-1 checkbox is not marked, and document-level data shows no 10b5-1 plan affirmation. The reported exercise and resulting acquisition of common units therefore are not identified as occurring under a pre-arranged trading plan.

What type of securities did Stephen G. Finley hold and exercise in Westlake Chemical Partners (WLKP)?

Finley held phantom units, classified as a derivative security. On August 6, 2026, he exercised these phantom units, which are the economic equivalent of common units, resulting in the acquisition of 5,005 WLKP common units.

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

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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^*

FINLEY G STEPHEN

(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 Chemical Partners LP [ WLKP ]

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

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/06/2026

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 Units	08/06/2026		M		5,005	A	(1)	36,935	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
Phantom Units	(1)	08/06/2026		M			5,005	08/06/2026	09/06/2026	Common Units	5,005	$0	0	D

Explanation of Responses:

1. Each Phantom Unit is the economic equivalent of one Common Unit of the Issuer.

Remarks:

Mr. Finley is a Director of Westlake Chemical Partners GP LLC, the general partner of Westlake Chemical Partners LP.

	G. Steven Finley by J Feng POA	08/07/2026
	** 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)