[Form 4] WESTLAKE CHEMICAL PARTNERS LP Insider Trading Activity

Rhea-AI Filing Summary

Westlake Chemical Partners LP (WLKP) insider purchases reported by Jean-Marc Gilson, President and CEO and director. The filing documents multiple open-market acquisitions of common units executed between 11/27/2024 and 08/21/2025, increasing the reporting person’s beneficial ownership from 4,331.96 units to 11,708.195 units. Transaction prices range roughly from $21.81 to $24.75 per unit; some later entries note weighted-average prices from multiple trades. An explanatory note states certain earlier purchases were inadvertently omitted and have been reconciled. No derivative transactions are reported.

Positive

• Significant insider buying: Reporting person increased direct ownership to 11,708.195 common units through multiple open-market purchases.
• Transparent pricing disclosure: Weighted-average price ranges provided for grouped transactions and offer to supply detailed allocations upon request.
• Correction of prior omission: Filing reconciles and reports common units previously not reported.

Negative

• Prior reporting omission: Some common units were inadvertently not reported earlier and required reconciliation.

Insights

Corporate Insider / Governance Analyst

TL;DR: CEO/director materially increased holdings via multiple open-market purchases, with reconciled prior omissions.

The filing shows repeated purchases of common units by the reporting person, raising direct beneficial ownership to 11,708.195 units. The purchases span several dates and price ranges, with explanatory notes disclosing weighted-average pricing for batches and a reconciliation entry correcting prior non-reported acquisitions. From a governance standpoint, voluntary insider purchases by a CEO/director typically signal internal confidence in the partnership’s equity, while the reconciliation note highlights a prior reporting omission that was subsequently corrected.

Securities Transactions / Compliance Specialist

TL;DR: Multiple Form 4 purchases documented; weighted-average pricing disclosed and an inadvertent omission was corrected.

The report records non-derivative acquisitions only, with granular explanatory disclosures on purchase price ranges and an attestation that detailed allocation per price is available if requested. No sales, option exercises, or derivative activity are shown. Compliance-wise, the corrected reporting of previously omitted units is appropriate; the form includes a Power of Attorney signature block indicating authorization for filing.

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
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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)
11/27/2024

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

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	11/27/2024		P		84.96	A	$23.565	4,331.96	D
Common Units	02/25/2025		P		82.507	A	$24.75	4,414.467	D
Common Units	05/29/2025		P		93.728	A	$22.202	4,508.195	D
Common Units	08/15/2025		P		4,700	A	$21.841(1)	9,208.195	D
Common Units	08/20/2025		P		1,250	A	$21.863(2)	10,458.195	D
Common Units	08/21/2025		P		1,250	A	$22.024(3)	11,708.195(4)	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. Weighted average price. These units were purchased in multiple transactions at prices ranging from $21.81 to $21.8692 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 units purchase at each separate price within the range set forth above.

2. Weighted average price. These units were purchased in multiple transactions at prices ranging from $21.83 to $21.9117 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 units purchase at each separate price within the range set forth above.

3. Weighted average price. These units were purchased in multiple transactions at prices ranging from $21.9767 to $22.056 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 units purchase at each separate price within the range set forth above.

4. Following a reconciliation of the Reporting Person's ownership records, this Form 4 reports common units acquired by the Reporting Person and inadvertently not reported previously on 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 insider activity did WLKP report?

The Form 4 reports multiple purchases of WLKP common units by Jean-Marc Gilson, increasing his direct ownership to 11,708.195 units.

Over what price range were the WLKP units purchased?

Transaction prices documented in the filing range approximately from $21.81 to $24.75 per unit, with weighted-average ranges disclosed for grouped trades.

Were any derivative transactions reported for WLKP?

No. Table II for derivative securities shows no derivative transactions; only non-derivative common unit purchases are reported.

Did the filing correct any prior reporting errors for WLKP?

Yes. An explanatory note states that certain units were inadvertently not reported previously and have now been reconciled on this Form 4.

Who filed the Form 4 for WLKP and what is their role?

The reporting person is Jean-Marc Gilson, identified as President and CEO and a director of Westlake Chemical Partners LP.