[Form 4/A] WESTLAKE CHEMICAL PARTNERS LP Amended Insider Trading Activity

Rhea-AI Filing Summary

Jean-Marc Gilson, President, CEO and Director of Westlake Chemical Partners LP (WLKP), amended a prior Form 4 to disclose an additional insider purchase. The amendment reports that 320 common units were purchased on 08/28/2024 at a price of $22.95 per unit, bringing the reporting persons beneficial ownership to 3,427 common units. The amendment states the 320 units were inadvertently omitted from the original Form 4 filed for the same date.

The Form 4/A is signed by a power of attorney on 08/28/2025 and clarifies that this filing supplements, rather than replaces, the original disclosure.

Positive

• Amendment corrects disclosure by reporting an omitted purchase of 320 common units, improving transparency
• Insider purchase disclosed: 320 common units acquired on 08/28/2024 at $22.95, now totaling 3,427 units

Negative

• Initial omission of 320 units from the original Form 4 indicates an error in prior reporting
• Amendment filed one year later (original transaction 08/28/2024; amendment dated/signature 08/28/2025), showing a delayed correction

Insights

Financial Analyst

TL;DR: Amendment corrects an omitted insider purchase of 320 units at $22.95, a minor disclosure adjustment with limited market impact.

The amendment documents a retrospective correction: 320 common units were acquired on 08/28/2024 at $22.95, increasing the reporting persons disclosed holdings to 3,427 units. As presented, the transaction size is small relative to typical LP market capitalizations and this filing is corrective in nature rather than announcing a new material transaction.

Corporate Governance Expert

TL;DR: Timely transparency matters; the Form 4/A restores accurate insider reporting but reflects an initial disclosure omission.

The document transparently amends the original Form 4 to include 320 units omitted from the initial filing. The signature by a power of attorney on 08/28/2025 formally certifies the correction. The filing addresses compliance with Section 16 reporting requirements by supplementing prior disclosure.

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^*

Gilson Jean-Marc

(Last) (First) (Middle)

2801 POST OAK BLVD., SUITE 600

(Street)

HOUSTON TX 77056

(City) (State) (Zip)

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
X	Officer (give title below)		Other (specify below)
	President and CEO

3. Date of Earliest Transaction (Month/Day/Year)
08/28/2024

4. If Amendment, Date of Original Filed (Month/Day/Year)
08/28/2025

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

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

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	08/28/2024		P		320(1)	A	$22.95	3,427	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:

1. The original Form 4 filed by the Reporting Person on August 28, 2024 is amended by this Form 4/A to disclose that an additional 320 common units were purchased by the Reporting Person on August 28, 2024 and inadvertently omitted from the original Form 4. Unless indicated, this Form 4/A is in addition to, and does not replace, the disclosure contained in the original Form 4.

	Jean-Marc Gilson by J. Feng, POA	08/28/2025
	** 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.

FAQ

What transaction did Jean-Marc Gilson disclose for WLKP?

The amendment reports an additional 320 common units purchased on 08/28/2024 at a price of $22.95 per unit.

How many WLKP units does the reporting person own after the reported transaction?

Following the transaction, the Form 4/A shows the reporting person beneficially owns 3,427 common units.

Why was this Form 4 amended?

The Form 4/A states the 320 common units were inadvertently omitted from the original Form 4 filed for 08/28/2024; this amendment adds that omission.

When was the amendment signed and by whom?

The Form 4/A is signed by Jean-Marc Gilson by J. Feng, POA and dated 08/28/2025.

What price was paid for the disclosed WLKP units?

The disclosed purchase price was $22.95 per common unit.