Stocks › WLK
WESTLAKE CORP
WLK·NYSE·
United States·USD
United States·USD$63.39
-1.22 (-1.89%)
Close · Oct 6, 2026 · Close Prices from Tiingo.com
WLK
WESTLAKE CORP · NYSE
Nasdaq 100S&P 500
Filings
Default90D1Y5YALL
WLKS&P 500 (rebased)
Congress BuyCongress SellInsider BuyInsider SellForm 1448-K ResultsLobbying
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Daily closes, adjusted for splits and dividends · Close Prices from Tiingo.comHover a marker, every one is a filing · move across the line for the crosshair
Congressional Trades
Recent trades of WLK by members of U.S. Congress · 35 on record
Whale Activity
Position changes in WLK reported for 2026-06-30 by 8 tracked institutional filers
- Increased4
- New2
- Held0
- Decreased2
- Closed0
- No prior filing0
| Filer | Shares | Value | Change |
|---|---|---|---|
| BlackRock, Inc. | 3.3M | $240.5M | increased |
| VANGUARD PORTFOLIO MANAGEMENT LLC | 1.8M | $127.9M | decreased |
| VANGUARD CAPITAL MANAGEMENT LLC | 1.5M | $106.9M | increased |
| CITADEL ADVISORS LLC | 1.1M | $77.0M | increased |
| MILLENNIUM MANAGEMENT LLC | 366.1K | $26.7M | increased |
| D. E. Shaw & Co., Inc. | 200.5K | $14.6M | decreased |
| Point72 Asset Management, L.P. | 89.7K | $6.6M | new |
| TWO SIGMA INVESTMENTS, LP | 45.4K | $3.3M | new |
KeyVex tracks a curated set of large 13F filers plus the largest positions in recent filings, so this is a sample of institutional activity, not the whole market.
Insider Trading
Net shares bought (+) or sold (−) on the open market by WLK insiders, by quarter · Form 4
Recent Insider Transactions
2,105 transactions on record · newest first
| Insider | Type | Shares | Price | Value | Date | |
|---|---|---|---|---|---|---|
| Chao AlbertExecutive Chairman · Director | Sale | −7,489 | $79.70 | $597K | Aug 11, 2026 | Form 4 ↗ |
| Chao AlbertExecutive Chairman · Director | Sale | −31.4K | $80.42 | $2.5M | Aug 11, 2026 | Form 4 ↗ |
| Bender Mark StevenEVP & CFO | Tax withholding | −5,284 | $97.34 | $514K | May 13, 2026 | Form 4 ↗ |
| Bender Mark StevenEVP & CFO | Option exercise | +13.2K | $0.00 | $0 | May 12, 2026 | Form 4 ↗ |
| Buesinger Robert F.EVP, PEM Segment Head | Sale | −4,000 | $115.25 | $461K | Mar 27, 2026 | Form 4 ↗ |
| Bender Mark StevenEVP & CFO | Sale | −16.4K | $112.54 | $1.8M | Mar 27, 2026 | Form 4 ↗ |
| Bender Mark StevenEVP & CFO | Sale | −421 | $101.52 | $43K | Feb 27, 2026 | Form 4 ↗ |
| Bender Mark StevenEVP & CFO | Sale | −17.0K | $100.91 | $1.7M | Feb 27, 2026 | Form 4 ↗ |
| Bender Mark StevenEVP & CFO | Disposition to issuer | −12.7K | $98.20 | $1.2M | Feb 27, 2026 | Form 4 ↗ |
| Bender Mark StevenEVP & CFO | Option exercise | +6,494 | $86.54 | $562K | Feb 27, 2026 | Form 4 ↗ |
| Bender Mark StevenEVP & CFO | Option exercise | +6,199 | $65.81 | $408K | Feb 27, 2026 | Form 4 ↗ |
| Szwejbka Scott ThomasSVP, HIP Segment Head | Tax withholding | −91 | $94.10 | $9K | Feb 20, 2026 | Form 4 ↗ |
| Holy Jeffrey AdamVP and CAO | Tax withholding | −81 | $94.10 | $8K | Feb 20, 2026 | Form 4 ↗ |
| Ederington L. BenjaminEVP, Legal & External Affairs | Tax withholding | −357 | $94.10 | $34K | Feb 20, 2026 | Form 4 ↗ |
| Buesinger Robert F.EVP, PEM Segment Head | Tax withholding | −326 | $94.10 | $31K | Feb 20, 2026 | Form 4 ↗ |
| Bender Mark StevenEVP & CFO | Tax withholding | −445 | $94.10 | $42K | Feb 20, 2026 | Form 4 ↗ |
| Chao John Tsung-chenDirector | Tax withholding | −91 | $94.10 | $9K | Feb 20, 2026 | Form 4 ↗ |
| Chao AlbertExecutive Chairman · Director | Tax withholding | −2,501 | $94.10 | $235K | Feb 20, 2026 | Form 4 ↗ |
| Chao JamesSenior Chairman · Director | Tax withholding | −1,569 | $94.10 | $148K | Feb 20, 2026 | Form 4 ↗ |
| Szwejbka Scott ThomasSVP, HIP Segment Head | Grant / award | +365 | $0.00 | $0 | Feb 19, 2026 | Form 4 ↗ |
Fund Holders
Mutual funds and ETFs holding WLK · SEC Form N-PORT
| Fund | Shares | Value | % of fund | As of |
|---|---|---|---|---|
| T. Rowe Price Mid-Cap Value Fund, Inc. | 1.1M | $83.2M | 0.51% | Jun 30, 2026 |
| iShares Core S&P Mid-Cap ETF iShares Trust | 1.1M | $83.1M | 0.07% | Jun 30, 2026 |
| Global X U.S. Infrastructure Development ETF GLOBAL X FUNDS | 939.9K | $81.6M | 0.60% | May 31, 2026 |
| VANGUARD TOTAL STOCK MARKET INDEX FUND VANGUARD INDEX FUNDS | 1.0M | $74.4M | 0.00% | Jun 30, 2026 |
| Income Fund of America | 975.0K | $68.7M | 0.05% | Jul 31, 2026 |
| VANGUARD SMALL-CAP INDEX FUND VANGUARD INDEX FUNDS | 732.9K | $53.5M | 0.03% | Jun 30, 2026 |
| VANGUARD SMALL-CAP VALUE INDEX FUND VANGUARD INDEX FUNDS | 465.3K | $34.0M | 0.05% | Jun 30, 2026 |
| VANGUARD EXTENDED MARKET INDEX FUND VANGUARD INDEX FUNDS | 382.4K | $27.9M | 0.03% | Jun 30, 2026 |
| U.S. SMALL CAP VALUE PORTFOLIO DFA INVESTMENT DIMENSIONS GROUP INC | 370.6K | $26.1M | 0.13% | Jul 31, 2026 |
| State Street(R) SPDR(R) S&P(R) Dividend ETF SPDR SERIES TRUST | 346.5K | $25.3M | 0.12% | Jun 30, 2026 |
Mutual funds and ETFs whose N-PORT filings list WLK's shares (CUSIP 960413102), each fund at its latest report since Mar 7, 2026, largest positions first. Bonds, options and short positions are left out.
Activist & Passive Stakes
Schedule 13D / 13G beneficial-ownership filings
No 13D/13G beneficial-ownership filings on record.
Corporate Lobbying
Estimated quarterly lobbying spending reported under the LDA, filings naming WESTLAKE CORP as client
No lobbying filings found naming WESTLAKE CORP as the client.
Government Contracts
Federal awards to WESTLAKE CORP · USAspending
No federal contract awards found for WESTLAKE CORP.
U.S. Patents
Recent USPTO applications naming WESTLAKE CORP
No USPTO patent applications found for WESTLAKE CORP.
Annual Financials
From WLK's 10-K filings · XBRL
No annual XBRL figures on record for WLK. KeyVex's fundamentals cover about 130 large companies so far.
Stock Splits
Every split and reverse split in the price history
- 2-for-1Stock splitMar 19, 2014
Split dates and ratios from the price history · Close Prices from Tiingo.com
Material Events (8-K)
Corporate events filed with the SEC
- 8-K · Items 2.05, 7.01Exit or disposal costs · Reg FD disclosureSep 29, 2026
EDGAR ↗ - 8-K · Items 5.02Officer / director changeAug 31, 2026
EDGAR ↗ - 8-K · Items 2.02, 7.01, 9.01Results of operations · Reg FD disclosureAug 4, 2026
EDGAR ↗ - 8-K · Items 8.01Other eventsJul 29, 2026
EDGAR ↗ - 8-K · Items 7.01, 9.01Reg FD disclosureJun 15, 2026
EDGAR ↗ - 8-K · Items 5.07Shareholder voteMay 18, 2026
EDGAR ↗ - 8-K · Items 2.02, 7.01, 9.01Results of operations · Reg FD disclosureMay 5, 2026
EDGAR ↗ - 8-K · Items 7.01Reg FD disclosureMay 1, 2026
EDGAR ↗
About WESTLAKE CORP
From SEC EDGAR company records
Industry (SIC 2860)Industrial Organic Chemicals
SectorMaterials
HeadquartersHOUSTON, TX
IncorporatedDE
SEC CIK0001262823 ↗
Former namesWESTLAKE CHEMICAL CORP