What SEC filings does Westlake Chemical Partners LP submit to the SEC?

Westlake Chemical Partners LP (WLKP) submits several types of SEC filings including Form 4 (insider transactions), Form 144 (proposed insider sales), 8-K reports (material events such as earnings releases, acquisitions, leadership changes), and periodic reports — the 10-Q (quarterly) and 10-K (annual). All filings are publicly available through SEC EDGAR.

What does a Form 4 filing tell me about WLKP?

A Form 4 for WLKP discloses a transaction by a company insider — typically a director, officer, or 10%+ shareholder. It shows the source-reported date, number of shares, price, and updated ownership. These facts do not establish motive or predict future returns.

How do I interpret an 8-K filing from Westlake Chemical Partners LP?

An 8-K signals a material event requiring prompt disclosure. Common triggers include earnings pre-announcements, acquisitions, leadership appointments or departures, credit changes, or regulatory actions. Read the item codes inside the filing to understand exactly what was disclosed before drawing conclusions.

What is the difference between a 10-K and 10-Q for WLKP?

The 10-K is Westlake Chemical Partners LP's annual report with fully audited financial statements, comprehensive MD&A, and complete risk factor disclosures — filed 60–90 days after fiscal year-end. The 10-Q is a lighter quarterly report with unaudited financials filed for the first three quarters. Together they provide a continuous financial picture of the company.

Where can I see all WLKP SEC filings directly on EDGAR?

You can view all historical Westlake Chemical Partners LP filings on the SEC EDGAR company page for WLKP. Each filing card on this page links directly to the original SEC document.

How often does Westlake Chemical Partners LP file with the SEC?

Westlake Chemical Partners LP files one 10-K per year and up to three 10-Qs per year. Form 4 insider transactions must be reported within two business days of each trade, so the frequency depends on how often insiders are buying or selling WLKP shares. 8-K filings occur whenever a material event happens — which can be several times per quarter for an active company.

WLKP SEC Filing News — Westlake Chemical Partners LP

Latest SEC filings for Westlake Chemical Partners LP (WLKP) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). StrongBuyAnalytics provides navigation and brief excerpts or summaries; original filings remain at the SEC/source links and were authored by their filers, not StrongBuyAnalytics. Filing dates shown are source dates. Coverage and detection can be delayed or incomplete because of SEC availability, amendments, parsing, caching, or outages. Latest source filing date shown: 2026-08-31.

Westlake Chemical Partners LP acquires, develops, and operates ethylene production facilities and related assets in the United States. It's ethylene production facilities which primarily convert ethane into ethylene. The company also sells ethylene co-products, such as propylene, crude butadiene, pyrolysis gasoline, and hydrogen directly to third parties on either a spot or contract basis. It serves as the general partner of the company. Westlake Chemical Partners LP was founded in 1991 and is h…

Sector: Basic Materials Industry: Chemicals Market Cap: $733.1M

Total Filings

Bullish Classifications

Bearish Classifications

Insider Transactions

Material Events (8-K)

Periodic Reports

Rule-based classifications for WLKP currently lean bullish. Of the 20 displayed SEC filing records, 2 carry bullish classifications versus 0 bearish classifications. These labels summarize filing attributes; they are not recommendations, probabilities, or evidence of future price direction. There were 8 insider transactions (Form 4) in this period.

WLKP Filing Activity Snapshot 2025-08-15 — 2026-08-31

Insider Transactions (Form 4)

2 buys vs 0 sells

Net insider buying in this period — more purchases than sales reported.

Largest Form 144 Filing

$263.4K

Ronald Bruce Northcutt · 2025-08-15

12,000 shares · Form 144

Form 144 Notices

Proposed insider sale filed — Form 144 is a notice of intent, not a confirmed transaction. Actual sales are confirmed via Form 4.

Insider Transactions 8 · Forms 3, 4 and 5

A Form 4 is filed within two business days of a company insider — an officer, a director, or a holder of more than ten percent of the stock — changing their position in the shares. All 8 filings in this group are Form 4s for Westlake Chemical Partners LP.

The difficulty with reading these filings as a group is that a single form type covers transactions that mean entirely different things. An executive spending their own money to buy stock and an executive having shares withheld to pay tax on a vesting grant both appear as a Form 4. Every filing below is therefore tagged with the nature of the underlying transaction, taken from the transaction code reported on the form itself.

Across the 8 insider filings shown, the breakdown is 3 compensation award, 3 option exercise and 2 open-market purchase. 2 of them involved a discretionary open-market trade; the rest are compensation and administrative mechanics.

What each transaction type means

Compensation award ×3: Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.
Option exercise ×3: The insider converted options into shares. The exercise price was fixed when the options were granted, so the timing usually tracks an expiry schedule.
Open-market purchase ×2: The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Form 4 Compensation award Tax / Compensation Filing 2026-08-13

WLKP insider Form 4 filed for equity award, exercise, or tax withholding

WOELFEL RANDY (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award derivative · Phantom Units	5,044	—	—

Filing: Form 4 (Insider Transaction) Insider: WOELFEL RANDY (Director)

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-08-13

WLKP insider Form 4 filed for equity award, exercise, or tax withholding

FINLEY G STEPHEN (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award derivative · Phantom Units	5,044	—	—

Filing: Form 4 (Insider Transaction) Insider: FINLEY G STEPHEN (Director)

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-08-13

WLKP insider Form 4 filed for equity award, exercise, or tax withholding

Friel Lisa A. (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award derivative · Phantom Units	5,044	—	—

Filing: Form 4 (Insider Transaction) Insider: Friel Lisa A. (Director)

View on SEC EDGAR → Open Filing Document →

Form 4 Option exercise Tax / Compensation Filing 2026-08-07

WLKP insider Form 4 filed for equity award, exercise, or tax withholding

Friel Lisa A. (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

The insider converted options into shares. The exercise price was fixed when the options were granted, so the timing usually tracks an expiry schedule.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`M`	Option exercise	5,005	—	—
`D`	Disposition to issuer	2,502	$21.35	$53.4K
`M`	Option exercise derivative · Phantom Units	5,005	—	—

Filing: Form 4 (Insider Transaction) Insider: Friel Lisa A. (Director) Shares: 7,507

View on SEC EDGAR → Open Filing Document →

Form 4 Option exercise Tax / Compensation Filing 2026-08-07

WLKP insider Form 4 filed for equity award, exercise, or tax withholding

WOELFEL RANDY (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

The insider converted options into shares. The exercise price was fixed when the options were granted, so the timing usually tracks an expiry schedule.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`M`	Option exercise	5,005	—	—
`D`	Disposition to issuer	5,005	$21.35	$106.9K
`M`	Option exercise derivative · Phantom Units	5,005	—	—

Filing: Form 4 (Insider Transaction) Insider: WOELFEL RANDY (Director) Shares: 10,010

View on SEC EDGAR → Open Filing Document →

Form 4 Option exercise Tax / Compensation Filing 2026-08-07

WLKP insider Form 4 filed for equity award, exercise, or tax withholding

FINLEY G STEPHEN (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

The insider converted options into shares. The exercise price was fixed when the options were granted, so the timing usually tracks an expiry schedule.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`M`	Option exercise	5,005	—	—
`M`	Option exercise derivative · Phantom Units	5,005	—	—

Filing: Form 4 (Insider Transaction) Insider: FINLEY G STEPHEN (Director) Shares: 5,005

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market purchase Insider Buying 2025-08-29

WLKP insider Gilson Jean-Marc (Director, President and CEO) bought 95 shares (~$2.0K)

Gilson Jean-Marc, listed as Director, President and CEO at Westlake Chemical Partners LP, reported an open-market purchase of 95 WLKP shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`P`	Open-market purchase	95	$21.25	$2.0K

Filing: Form 4 (Insider Transaction) Insider: Gilson Jean-Marc (Director, President and CEO) Shares: 95 Est. Value: $2.0K

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market purchase Insider Buying 2025-08-28

WLKP insider Gilson Jean-Marc (Director, President and CEO) bought 7,459 shares (~$163.6K)

Gilson Jean-Marc, listed as Director, President and CEO at Westlake Chemical Partners LP, reported an open-market purchase of 7,459 WLKP shares in a Form 4 filing. Insider buying is often treated as a bullish signal because company insiders are committing their own capital.

The insider bought shares on the open market with their own money. This is the only Form 4 category that requires a discretionary cash outlay at the prevailing price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`P`	Open-market purchase	84	$23.57	$2.0K
`P`	Open-market purchase	82	$24.75	$2.0K
`P`	Open-market purchase	93	$22.20	$2.1K
`P`	Open-market purchase	4,700	$21.84	$102.7K
`P`	Open-market purchase	1,250	$21.86	$27.3K
`P`	Open-market purchase	1,250	$22.02	$27.5K

Filing: Form 4 (Insider Transaction) Insider: Gilson Jean-Marc (Director, President and CEO) Shares: 7,459 Est. Value: $163.6K

View on SEC EDGAR → Open Filing Document →

Proposed Insider Sales 1 · Form 144

A Form 144 is a notice of intent to sell restricted or control securities. It is not a record that anything was sold. Westlake Chemical Partners LP has 1 such notice in this period.

The distinction matters because a Form 144 is frequently reported as though it were a completed insider sale. The filer may sell all of the shares covered, some of them, or none at all, and there is no obligation to update the notice either way. A sale that is actually executed by an officer or director shows up separately on a Form 4, which is the filing to check before treating a proposed sale as a real one.

Form 144 Proposed Insider Sale 2025-08-15

WLKP Form 144 filed for proposed insider sale by Ronald Bruce Northcutt (12,000 shares) ~$263.4K

Ronald Bruce Northcutt filed a Form 144 with the SEC indicating intent to sell WLKP (Westlake Chemical Partners LP) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Ronald Bruce Northcutt Shares: 12,000 Est. Value: $263.4K

View on SEC EDGAR → Open Filing Document →

Material Events 7 · Form 8-K

An 8-K reports a material event in the window between scheduled reports. There are 7 in this period for Westlake Chemical Partners LP. Each 8-K names the item number it is filed under, and that number is the fastest way to tell a routine disclosure from a consequential one.

Item 2.02 is an earnings release, Item 5.02 is a change of directors or officers, and Item 1.01 or 2.01 covers a material agreement or a completed acquisition. Item 7.01 and Item 8.01 are the general-purpose disclosure items and carry no fixed meaning on their own.

Form 8-K Material Company Update 2026-08-31