Westlake Corporation (WLK)
WLK moved a median of +0.06% 30 minutes after news, and +0.05% by the close. How WLK actually reacts to news — the realized, point-in-time move the market made, measured across 383 labeled events over the last three years with zero look-ahead.
WLK’s median reaction, across the day.
| Horizon | Median | % positive | Events |
|---|---|---|---|
| 5-min | 0.00% | 48% | 382 |
| 30-min | +0.06% | 55% | 383 |
| 60-min | +0.04% | 52% | 383 |
| to close | +0.05% | 51% | 374 |
| Middle 50% of WLK reactions | -0.47% to +0.68% |
|---|---|
| Median reaction (30-min) | +0.06% |
| Measured reactions | 383 |
Half of all Westlake Corporation news events land between -0.47% and +0.68% at 30 minutes.
Reaction stats as of 2026-09-21. Newest measured event . Reaction = percent move vs. the price at the news timestamp.
How WLK reacts, by analyst action.
| Event | Events | Median 30-min | % positive | Median to close |
|---|---|---|---|---|
| Analyst upgrades | 55 | +0.21% | 58% | -0.25% |
| Analyst downgrades | 39 | +0.36% | 62% | -0.12% |
| Coverage initiations | 10 | -0.19% | 0% | -1.99% |
| Rating reiterations | 121 | -0.06% | 45% | -0.04% |
| Price-target raises | 29 | +0.09% | 55% | +0.14% |
| Price-target cuts | 54 | +0.04% | 54% | -0.05% |
Last 3 years, pulled 2026-09-21. Reaction = percent move vs. the price at the news timestamp. Counts and medians only. The same measurement runs across every name in the dataset. See how WLK ranks against every other measured name →
That’s how WLK usually reacts — get an email when it moves on news →Email me when WLK moves on news.
One email per qualifying move — the headline, the measured reaction, and how it compares to WLK's baseline. Nothing else.
Recent WLK events, each with its measured reaction.
| Date | Headline | Event | Source | 5-min | To close |
|---|---|---|---|---|---|
| Westlake Royal Building Products™ Consolidates US Tile® and Newpoint™ Roofing Brands Under One Name | Press release | GlobeNewswire | -0.70% | +2.17% | |
| Form 8-K WESTLAKE CORP For: Sep 24 | SEC filing · Form 8-K | SEC EDGAR | +1.28% | -0.16% | |
| Form 8-K WESTLAKE CORP For: Aug 31 | SEC filing · Form 8-K | SEC EDGAR | -1.29% | -1.05% | |
| Form 8-A12B WESTLAKE CORP | SEC filing · Form 8-A12B | SEC EDGAR | -0.06% | -1.03% | |
| Form CERT WESTLAKE CORP | SEC filing · Form CERT | SEC EDGAR | +0.04% | -1.07% | |
| Westlake Announces Dual Listing on NYSE Texas | Press release | GlobeNewswire | -0.09% | -0.80% | |
| Westlake Corporation Declares Quarterly Dividend | Press release | GlobeNewswire | -0.35% | -1.06% | |
| Form 10-Q WESTLAKE CORP For: Jun 30 | SEC filing · Form 10-Q | SEC EDGAR | -0.17% | +0.62% | |
| Form 8-K WESTLAKE CORP For: Aug 04 | SEC filing · Form 8-K | SEC EDGAR | +3.32% | +10.16% | |
| Westlake Corporation Reports Second Quarter 2026 Results | Press release | GlobeNewswire | +3.32% | +10.16% | |
| Form 8-K WESTLAKE CORP For: Jul 29 | SEC filing · Form 8-K | SEC EDGAR | -0.65% | -1.10% | |
| Westlake Announces Second Quarter 2026 Conference Call | Press release | GlobeNewswire | +0.12% | -1.35% | |
| Westlake Royal Building Products™ Introduces SturdiMount™ Woodgrain | Press release | GlobeNewswire | +0.12% | -1.35% | |
| Dutch Quality Stone® Introduces New Neutral Colorways Across Profiles and Accessories | Press release | Business Wire | -0.37% | -1.69% | |
| Westlake Royal Building Products™ Introduced Integrated Exterior Solutions at the AIA Conference on Architecture & Design 2026 | Press release | Business Wire | +0.13% | -2.95% | |
| Form 8-K WESTLAKE CORP For: Jun 15 | SEC filing · Form 8-K | SEC EDGAR | +0.13% | -2.95% | |
| Westlake Expands Global Chlorovinyls Manufacturing Capacity With Acquisition of PVC and VCM Plants in Wilhelmshaven, Germany | Press release | Business Wire | +0.05% | -0.50% | |
| Form 8-K WESTLAKE CORP For: May 14 | SEC filing · Form 8-K | SEC EDGAR | -2.09% | -2.82% | |
| Form SD WESTLAKE CORP | SEC filing · Form SD | SEC EDGAR | -2.09% | -2.82% | |
| Westlake Corporation Declares Quarterly Dividend | Press release | Business Wire | -1.10% | +1.37% | |
| Form 10-Q WESTLAKE CORP For: Mar 31 | SEC filing · Form 10-Q | SEC EDGAR | +0.10% | -1.37% | |
| Form 8-K WESTLAKE CORP For: May 05 | SEC filing · Form 8-K | SEC EDGAR | +2.34% | +2.02% | |
| Westlake Corporation Reports First Quarter 2026 Results | Press release | Business Wire | +2.34% | +2.02% | |
| Westlake Epoxy’s Deer Park, Texas, Site Achieves ISCC PLUS Certification, Expanding EpoVIVE™ Mass Balance Offering Across Europe and the U.S. | Press release | Business Wire | -1.03% | -0.56% | |
| Form 8-K WESTLAKE CORP For: Apr 27 | SEC filing · Form 8-K | SEC EDGAR | -0.00% | -0.62% | |
| Westlake Announces First Quarter 2026 Conference Call | Press release | Business Wire | +1.93% | +2.35% | |
| Form 8-K WESTLAKE CORP For: Apr 15 | SEC filing · Form 8-K | SEC EDGAR | +1.93% | +2.35% | |
| Westlake Corporation Appoints Jonathan H. Baksht as Senior Vice President and Chief Financial Officer | Press release | Business Wire | +1.93% | +2.35% | |
| Form 8-K WESTLAKE CORP For: Apr 13 | SEC filing · Form 8-K | SEC EDGAR | -3.22% | -1.31% | |
| Form 8-K WESTLAKE CORP For: Apr 02 | SEC filing · Form 8-K | SEC EDGAR | +0.90% | +1.63% | |
| Form 8-K WESTLAKE CORP For: Mar 30 | SEC filing · Form 8-K | SEC EDGAR | -1.05% | +2.40% | |
| Form ARS WESTLAKE CORP For: Dec 31 | SEC filing · Form ARS | SEC EDGAR | -1.05% | +2.40% | |
| Form DEF 14A WESTLAKE CORP For: May 14 | SEC filing · Form DEF | SEC EDGAR | -1.05% | +2.40% | |
| Form DEFA14A WESTLAKE CORP | SEC filing · Form DEFA14A | SEC EDGAR | -1.05% | +2.40% | |
| Form 10-K WESTLAKE CORP For: Dec 31 | SEC filing · Form 10-K | SEC EDGAR | +0.10% | +0.63% | |
| Form 8-K WESTLAKE CORP For: Feb 24 | SEC filing · Form 8-K | SEC EDGAR | -3.65% | -0.79% | |
| Westlake Corporation Reports Fourth Quarter and Full Year 2025 Results | Press release | Business Wire | -3.65% | -0.79% | |
| Form 8-K WESTLAKE CORP For: Feb 19 | SEC filing · Form 8-K | SEC EDGAR | -3.65% | -0.79% | |
| Westlake Corporation Appoints New Directors to its Board | Press release | Business Wire | -3.65% | -0.79% | |
| Westlake Corporation Declares Quarterly Dividend | Press release | Business Wire | +0.76% | -0.87% | |
| Westlake Royal Building Products™ Adds New D5 Vinyl Siding Options Across Royal® and Exterior Portfolio® Lines | Press release | Business Wire | +0.62% | -3.53% | |
| Westlake Royal Building Products™ Introduces Vertälla™ Accent Panel for Royal® and Exterior Portfolio® Siding Lines | Press release | Business Wire | +0.01% | +0.59% | |
| Westlake Royal Building Products™ Launches Industry’s Widest Vinyl Board & Batten Profile | Press release | Business Wire | -0.02% | +0.03% | |
| Westlake Epoxy Expands Distribution Relationship with Brenntag to India | Press release | Business Wire | +0.01% | +0.59% | |
| Westlake Royal Building Products™ Adds Column Wraps and New Color to Grove Collection™ Trim Line | Press release | Business Wire | +0.09% | -0.14% | |
| Westlake Royal Building Products™ Expands Celect® Cellular Composite Siding Line With New V-Groove Profile and Coastal Colors | Press release | Business Wire | -0.23% | -1.77% | |
| From ‘Quiet Luxury’ to New Neutrals: Westlake Royal Building Products™ Reveals Top 2026 Trends Driving Home Design Choices | Press release | Business Wire | -0.23% | -1.77% | |
| Westlake Royal Building Products™ Introduces 5/8” Lap Siding Profile for TruExterior® Siding & Trim | Press release | Business Wire | -0.23% | -1.77% | |
| Westlake Royal Building Products™ Launches New Website Featuring Innovative AI Design Tool | Press release | Business Wire | -0.23% | -1.77% | |
| Westlake Announces Fourth Quarter and Full Year Earnings for 2025 Conference Call | Press release | Business Wire | +0.30% | +2.15% |
Each reaction is the move the market actually made, measured from the news timestamp. Headlines link through to the WLK section they belong to.
Where else WLK is measured.
WLK earnings → · Analyst actions → · SEC filings →
Other Basic Materials names, measured the same way
| Ticker | Events | Median 30-min | % positive |
|---|---|---|---|
| Alcoa Corporation (AA) | 386 | -0.24% | 42% |
| Apogee Enterprises, Inc. (APOG) | 384 | -0.03% | 49% |
| Novagold Resources Inc. (NG) | 382 | -0.04% | 47% |
| Wheaton Precious Metals Corp Common Shares (Canada) (WPM) | 377 | -0.04% | 48% |
Same sector, same measurement: percent move vs. the price at the news timestamp, read at 30 minutes. Sample sizes differ, so the medians are comparable but the confidence behind them is not.
All Basic Materials names, measured the same way →
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Every name we’ve measured, in one place.
How the numbers are made.
How is Westlake Corporation's median reaction calculated?
Every labeled WLK news event is measured from its own timestamp: the last trade before the news is the base price, and the move is read at fixed horizons — 30 minutes of trading, then the close. The median across 383 events is what this page reports. Point-in-time, zero look-ahead: no event borrows information from a later one.
What counts as a positive reaction?
Any event whose price move is above zero at the horizon, relative to the last trade before the news timestamp. 55% of WLK's measured events are up at 30 minutes; the rest close the window flat or negative.
How often is this page updated?
The news table refreshes automatically as new events are labeled and priced. The reaction medians are re-pulled in batches from the dataset — the figures here are as of 2026-09-21.
Does WLK's past reaction predict its next one?
No. These are realized facts about past events, not forecasts. They describe a distribution — they say nothing certain about any future move.