Latest 10-Q

What changed in Westlake Chemical Partners LP's latest quarterly report, compared with the one before.

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Insider trades

Open-market trades from Form 4. 10b5-1 marks a plan set in advance.Open-market buys and sales by officers, directors and 10% owners, from SEC Form 4. A plan set in advance is marked 10b5-1.

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13F holders

Funds that report this stock, checked against market prices.Fund managers with over $100 million in US-listed stocks file a 13F each quarter, up to 45 days after quarter end. Long positions only.

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Trades by members of Congress

Disclosed in dollar ranges, up to 45 days after the trade.Members of Congress, their spouses and dependent children report trades in dollar ranges, up to 45 days after the trade.

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Lobbying

What Westlake Chemical Partners LP and its lobbying firms report each quarter.A company that lobbies with its own staff reports its expenses; a lobbying firm it hires reports the income it received. We count both.

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Lobbying and contracts

What Westlake Chemical Partners LP reported spending on lobbying next to the federal contracts it was awarded, by year.Lobbying: each report counts once. If a report was amended, only the newest version counts. Totals use the company's own report when it files one (it includes payments to hired firms); otherwise the hired firms' reported income. Registrations and reports with no amount are not counted. A firm that hands part of its work to another firm may report the same money as that other firm does; the filings do not allow us to tell. Contracts: each award is counted once, for the company that received it (or its listed parent when only the parent is matched), in the year of its first obligation. The amount is the total obligated to date, so a later increase is counted in the year the award began. Only awards of $1 million or more are collected. Agencies: the offices named on lobbying reports and the awarding agencies of contracts are matched to one department name (the Army, Navy and Air Force count as the Department of Defense; NIH, FDA and CMS as Health and Human Services). An agency is listed under both when the company lobbied it and was awarded a contract by it in the same period. Offices outside this list, and Congress, are not counted as agencies.

$0$100.0K$200.0K$300.0K$400.0K2024 · Lobbying: $140,0002024 · Federal contracts: $020242025 · Lobbying: $390,0002025 · Federal contracts: $02025

Lobbying Federal contractsBoth bars use one dollar scale.

Lobbying and federal contracts of Westlake Chemical Partners LP by year
Gifts by the company's PAC to candidates for Congress. They come from donations to the PAC, not from the company's own funds.
2025$390.0K6Taxation——————
2024$140.0K2Taxation——————

Agencies both lobbied and awarding contracts

No agency appears on both sides in the last 12 months.

Lobbying and contract awards are reported separately; showing them together does not mean one caused the other.

All companies · Contract awards · Lobbying reports

Institutional ownership over time

How many funds reported holding the stock at the end of each quarter, and how many shares they held between them.

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More filings and data

Each opens the table.

About the company

The basics from the company’s SEC registration.

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$21.20−$0.48 (−2.21%) Nov 13 close
Oct 13, 2026: $21.10Oct 14, 2026: $20.92Oct 15, 2026: $20.84Oct 16, 2026: $20.80Oct 19, 2026: $20.91Oct 20, 2026: $21.05Oct 21, 2026: $20.87Oct 22, 2026: $20.96Oct 23, 2026: $21.15Oct 26, 2026: $21.13Oct 27, 2026: $21.15Oct 28, 2026: $21.14Oct 29, 2026: $21.13Oct 30, 2026: $21.26Nov 2, 2026: $21.82Nov 3, 2026: $21.78Nov 4, 2026: $21.61Nov 5, 2026: $21.35Nov 6, 2026: $21.19Nov 9, 2026: $21.01Nov 10, 2026: $21.37Nov 11, 2026: $21.42Nov 12, 2026: $21.68Nov 13, 2026: $21.20
Oct 13, 2026Low $20.80 · High $21.82Nov 13, 2026
Aug 13, 2026: $21.67Aug 14, 2026: $21.70Aug 17, 2026: $21.66Aug 18, 2026: $21.70Aug 19, 2026: $21.72Aug 20, 2026: $21.53Aug 21, 2026: $21.56Aug 24, 2026: $21.48Aug 25, 2026: $21.62Aug 26, 2026: $21.69Aug 27, 2026: $21.73Aug 28, 2026: $21.63Aug 31, 2026: $21.64Sep 1, 2026: $21.73Sep 2, 2026: $22.11Sep 3, 2026: $21.93Sep 4, 2026: $21.88Sep 8, 2026: $21.74Sep 9, 2026: $21.67Sep 10, 2026: $21.47Sep 11, 2026: $21.52Sep 14, 2026: $21.48Sep 15, 2026: $21.48Sep 16, 2026: $21.28Sep 17, 2026: $21.33Sep 18, 2026: $21.22Sep 21, 2026: $21.29Sep 22, 2026: $21.38Sep 23, 2026: $21.35Sep 24, 2026: $21.51Sep 25, 2026: $21.60Sep 28, 2026: $21.55Sep 29, 2026: $21.43Sep 30, 2026: $21.20Oct 1, 2026: $21.26Oct 2, 2026: $21.27Oct 5, 2026: $21.42Oct 6, 2026: $21.59Oct 7, 2026: $21.38Oct 8, 2026: $21.41Oct 9, 2026: $21.19Oct 12, 2026: $21.08Oct 13, 2026: $21.10Oct 14, 2026: $20.92Oct 15, 2026: $20.84Oct 16, 2026: $20.80Oct 19, 2026: $20.91Oct 20, 2026: $21.05Oct 21, 2026: $20.87Oct 22, 2026: $20.96Oct 23, 2026: $21.15Oct 26, 2026: $21.13Oct 27, 2026: $21.15Oct 28, 2026: $21.14Oct 29, 2026: $21.13Oct 30, 2026: $21.26Nov 2, 2026: $21.82Nov 3, 2026: $21.78Nov 4, 2026: $21.61Nov 5, 2026: $21.35Nov 6, 2026: $21.19Nov 9, 2026: $21.01Nov 10, 2026: $21.37Nov 11, 2026: $21.42Nov 12, 2026: $21.68Nov 13, 2026: $21.20
Aug 13, 2026Low $20.80 · High $22.11Nov 13, 2026
Nov 13, 2025: $18.78Nov 14, 2025: $18.54Nov 17, 2025: $17.92Nov 18, 2025: $17.90Nov 19, 2025: $17.91Nov 20, 2025: $17.87Nov 21, 2025: $18.20Nov 24, 2025: $18.45Nov 25, 2025: $18.72Nov 26, 2025: $19.06Nov 28, 2025: $18.96Dec 1, 2025: $18.82Dec 2, 2025: $18.96Dec 3, 2025: $19.00Dec 4, 2025: $18.93Dec 5, 2025: $19.16Dec 8, 2025: $18.97Dec 9, 2025: $19.02Dec 10, 2025: $19.32Dec 11, 2025: $19.73Dec 12, 2025: $19.76Dec 15, 2025: $19.21Dec 16, 2025: $19.25Dec 17, 2025: $19.21Dec 18, 2025: $19.39Dec 19, 2025: $19.10Dec 22, 2025: $19.10Dec 23, 2025: $19.05Dec 24, 2025: $18.88Dec 26, 2025: $18.66Dec 29, 2025: $18.50Dec 30, 2025: $18.62Dec 31, 2025: $19.00Jan 2, 2026: $18.95Jan 5, 2026: $19.19Jan 6, 2026: $19.88Jan 7, 2026: $19.74Jan 8, 2026: $20.11Jan 9, 2026: $20.30Jan 12, 2026: $20.25Jan 13, 2026: $20.33Jan 14, 2026: $20.91Jan 15, 2026: $20.94Jan 16, 2026: $20.85Jan 20, 2026: $20.83Jan 21, 2026: $21.21Jan 22, 2026: $21.31Jan 23, 2026: $21.09Jan 26, 2026: $21.11Jan 27, 2026: $21.18Jan 28, 2026: $21.41Jan 29, 2026: $21.68Jan 30, 2026: $21.46Feb 2, 2026: $21.93Feb 3, 2026: $21.86Feb 4, 2026: $21.80Feb 5, 2026: $21.61Feb 6, 2026: $20.68Feb 9, 2026: $21.22Feb 10, 2026: $21.18Feb 11, 2026: $21.50Feb 12, 2026: $21.15Feb 13, 2026: $21.32Feb 17, 2026: $21.19Feb 18, 2026: $21.34Feb 19, 2026: $20.94Feb 20, 2026: $21.21Feb 23, 2026: $21.24Feb 24, 2026: $22.08Feb 25, 2026: $22.01Feb 26, 2026: $21.86Feb 27, 2026: $22.02Mar 2, 2026: $22.19Mar 3, 2026: $22.01Mar 4, 2026: $22.15Mar 5, 2026: $22.73Mar 6, 2026: $22.10Mar 9, 2026: $21.70Mar 10, 2026: $22.12Mar 11, 2026: $22.21Mar 12, 2026: $22.73Mar 13, 2026: $22.45Mar 16, 2026: $22.03Mar 17, 2026: $22.33Mar 18, 2026: $22.36Mar 19, 2026: $22.45Mar 20, 2026: $22.22Mar 23, 2026: $22.05Mar 24, 2026: $22.30Mar 25, 2026: $22.40Mar 26, 2026: $22.18Mar 27, 2026: $21.71Mar 30, 2026: $21.74Mar 31, 2026: $22.09Apr 1, 2026: $22.39Apr 2, 2026: $22.13Apr 6, 2026: $22.10Apr 7, 2026: $22.40Apr 8, 2026: $22.57Apr 9, 2026: $22.68Apr 10, 2026: $22.66Apr 13, 2026: $22.65Apr 14, 2026: $22.60Apr 15, 2026: $22.30Apr 16, 2026: $22.33Apr 17, 2026: $22.39Apr 20, 2026: $22.34Apr 21, 2026: $22.33Apr 22, 2026: $22.46Apr 23, 2026: $22.46Apr 24, 2026: $22.56Apr 27, 2026: $22.53Apr 28, 2026: $22.82Apr 29, 2026: $22.86Apr 30, 2026: $23.05May 1, 2026: $22.99May 4, 2026: $22.67May 5, 2026: $22.57May 6, 2026: $23.45May 7, 2026: $23.20May 8, 2026: $23.28May 11, 2026: $23.72May 12, 2026: $23.54May 13, 2026: $23.57May 14, 2026: $23.00May 15, 2026: $22.65May 18, 2026: $22.71May 19, 2026: $22.47May 20, 2026: $22.38May 21, 2026: $22.56May 22, 2026: $22.50May 26, 2026: $22.71May 27, 2026: $22.75May 28, 2026: $22.77May 29, 2026: $22.93Jun 1, 2026: $23.18Jun 2, 2026: $23.27Jun 3, 2026: $23.15Jun 4, 2026: $23.01Jun 5, 2026: $23.14Jun 8, 2026: $23.32Jun 9, 2026: $23.21Jun 10, 2026: $23.28Jun 11, 2026: $23.29Jun 12, 2026: $23.33Jun 15, 2026: $23.25Jun 16, 2026: $23.32Jun 17, 2026: $22.77Jun 18, 2026: $22.60Jun 22, 2026: $22.57Jun 23, 2026: $22.69Jun 24, 2026: $22.65Jun 25, 2026: $22.53Jun 26, 2026: $22.66Jun 29, 2026: $22.53Jun 30, 2026: $22.26Jul 1, 2026: $22.29Jul 2, 2026: $22.36Jul 6, 2026: $22.10Jul 7, 2026: $22.29Jul 8, 2026: $22.29Jul 9, 2026: $22.15Jul 10, 2026: $21.96Jul 13, 2026: $22.09Jul 14, 2026: $22.04Jul 15, 2026: $21.90Jul 16, 2026: $21.79Jul 17, 2026: $22.01Jul 20, 2026: $22.00Jul 21, 2026: $22.03Jul 22, 2026: $22.04Jul 23, 2026: $22.01Jul 24, 2026: $22.05Jul 27, 2026: $21.85Jul 28, 2026: $22.03Jul 29, 2026: $21.90Jul 30, 2026: $21.73Jul 31, 2026: $21.64Aug 3, 2026: $21.27Aug 4, 2026: $21.30Aug 5, 2026: $21.27Aug 6, 2026: $21.35Aug 7, 2026: $21.66Aug 10, 2026: $21.68Aug 11, 2026: $21.57Aug 12, 2026: $22.06Aug 13, 2026: $21.67Aug 14, 2026: $21.70Aug 17, 2026: $21.66Aug 18, 2026: $21.70Aug 19, 2026: $21.72Aug 20, 2026: $21.53Aug 21, 2026: $21.56Aug 24, 2026: $21.48Aug 25, 2026: $21.62Aug 26, 2026: $21.69Aug 27, 2026: $21.73Aug 28, 2026: $21.63Aug 31, 2026: $21.64Sep 1, 2026: $21.73Sep 2, 2026: $22.11Sep 3, 2026: $21.93Sep 4, 2026: $21.88Sep 8, 2026: $21.74Sep 9, 2026: $21.67Sep 10, 2026: $21.47Sep 11, 2026: $21.52Sep 14, 2026: $21.48Sep 15, 2026: $21.48Sep 16, 2026: $21.28Sep 17, 2026: $21.33Sep 18, 2026: $21.22Sep 21, 2026: $21.29Sep 22, 2026: $21.38Sep 23, 2026: $21.35Sep 24, 2026: $21.51Sep 25, 2026: $21.60Sep 28, 2026: $21.55Sep 29, 2026: $21.43Sep 30, 2026: $21.20Oct 1, 2026: $21.26Oct 2, 2026: $21.27Oct 5, 2026: $21.42Oct 6, 2026: $21.59Oct 7, 2026: $21.38Oct 8, 2026: $21.41Oct 9, 2026: $21.19Oct 12, 2026: $21.08Oct 13, 2026: $21.10Oct 14, 2026: $20.92Oct 15, 2026: $20.84Oct 16, 2026: $20.80Oct 19, 2026: $20.91Oct 20, 2026: $21.05Oct 21, 2026: $20.87Oct 22, 2026: $20.96Oct 23, 2026: $21.15Oct 26, 2026: $21.13Oct 27, 2026: $21.15Oct 28, 2026: $21.14Oct 29, 2026: $21.13Oct 30, 2026: $21.26Nov 2, 2026: $21.82Nov 3, 2026: $21.78Nov 4, 2026: $21.61Nov 5, 2026: $21.35Nov 6, 2026: $21.19Nov 9, 2026: $21.01Nov 10, 2026: $21.37Nov 11, 2026: $21.42Nov 12, 2026: $21.68Nov 13, 2026: $21.20
Nov 13, 2025Low $17.87 · High $23.72Nov 13, 2026
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Adjusted for stock splits; not for dividends. Where prices come from.

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