WLKNYSEIndustrial Organic ChemicalsFiscal year ends December 31
WESTLAKE CORP
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Aug 5, 2026
$62.29−1.04 (-1.64%)
Close on Oct 19, 2026
- Market cap
- $8.00B
- P/E (TTM)
- –
- Dividend yield
- 3.39%
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
31.1%
40M of 128M shares
Institutional holders
358
87 new, 64 sold out
Net institutional buying
-4M
In Q2 2026
Insider trades, 12 months
0 buys · 9 sales
Net sold $10.19M
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| Ttwfgp LLC | 93,405,554 | 72.90% | 13G (passive) amendment | Dec 31, 2023 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of WLK | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| BlackRock, Inc. | 3,294,162 | 2.58% | $240.47M | +215,075 | 0.00% |
| Capital World Investors | 2,842,348 | 2.22% | $207.49M | −1,368,658 | 0.02% |
| Price T Rowe Associates Inc /Md/ | 2,206,676 | 1.73% | $161.09K | −200,781 | 0.02% |
| Orbis Allan Gray Ltd | 2,084,364 | 1.63% | $152.16M | −3,209,155 | 0.52% |
| Dimensional Fund Advisors LP | 2,051,554 | 1.61% | $149.78M | +585,534 | 0.03% |
| Vanguard Portfolio Management LLC | 1,752,627 | 1.37% | $127.94M | −17,181 | 0.01% |
| Brandes Investment Partners, LP | 1,572,939 | 1.23% | $114.83M | −269,711 | 0.80% |
| Aqr Capital Management LLC | 1,570,453 | 1.23% | $114.64M | +1,310,383 | 0.04% |
| Vanguard Capital Management LLC | 1,464,223 | 1.15% | $106.89M | +8,629 | 0.00% |
| State Street Corp | 1,453,407 | 1.14% | $106.10M | +72,914 | 0.00% |
| Goldman Sachs Group Inc | 1,280,873 | 1.00% | $93.50M | −112,454 | 0.01% |
| Citadel Advisors LLC | 1,054,868 | 0.83% | $77.01M | +339,282 | 0.01% |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | 1,023,403 | 0.80% | $74.71M | +79,428 | 0.09% |
| UBS Asset Management Americas Inc | 817,207 | 0.64% | $59.66M | −164,198 | 0.01% |
| Geode Capital Management, LLC | 718,597 | 0.56% | $52.47M | +104,263 | 0.00% |
| Jacobs Levy Equity Management, Inc | 709,355 | 0.56% | $51.78M | +360,320 | 0.19% |
| Balyasny Asset Management L.P. | 625,859 | 0.49% | $45.69M | +256,187 | 0.06% |
| Woodline Partners LP | 451,986 | 0.35% | $32.99M | +114,911 | 0.10% |
| Nuveen, LLC | 446,479 | 0.35% | $32.59M | −118,265 | 0.01% |
| Morgan Stanley | 437,571 | 0.34% | $31.94M | −48,937 | 0.00% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | % of shares | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 358 | 40M | 31.1% | 87 / 109 | 119 / 64 | 8M | 12M |
| Q1 2026 | 339 | 44M | 34.5% | 93 / 117 | 87 / 47 | 12M | 11M |
| Q4 2025 | 298 | 46M | 36.3% | 63 / 93 | 112 / 64 | 13M | 8M |
| Q3 2025 | 305 | 42M | 32.6% | 58 / 102 | 106 / 55 | 11M | 9M |
| Q2 2025 | 306 | 40M | 31.0% | 46 / 125 | 105 / 96 | 10M | 7M |
| Q1 2025 | 361 | 36M | 28.5% | 47 / 147 | 115 / 61 | 6M | 4M |
| Q4 2024 | 378 | 35M | 27.6% | 48 / 145 | 127 / 68 | 7M | 5M |
| Q3 2024 | 403 | 34M | 26.5% | 69 / 147 | 124 / 46 | 7M | 4M |
| Q2 2024 | 382 | 34M | 26.7% | 67 / 125 | 135 / 30 | 4M | 5M |
| Q1 2024 | 347 | 36M | 27.8% | 45 / 121 | 119 / 53 | 3M | 4M |
| Q4 2023 | 357 | 36M | 28.5% | 57 / 104 | 136 / 29 | 2M | 3M |
| Q3 2023 | 335 | 37M | 29.2% | 36 / 92 | 144 / 38 | 3M | 3M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
| Fund | Shares | % of WLK | Value | % of fund | As of |
|---|---|---|---|---|---|
| T. Rowe Price Mid-Cap Value Fund, Inc. | 1,139,623 | 0.89% | $83.19M | 0.51% | Jun 30, 2026 |
| iShares Core S&P Mid-Cap ETF | 1,138,906 | 0.89% | $83.14M | 0.07% | Jun 30, 2026 |
| Vanguard Total Stock Market Index Fund | 1,018,691 | 0.80% | $74.36M | 0.00% | Jun 30, 2026 |
| Income Fund of America | 975,000 | 0.76% | $68.74M | 0.05% | Jul 31, 2026 |
| Global X U.S. Infrastructure Development ETF | 939,919 | 0.74% | $81.61M | 0.60% | May 31, 2026 |
| Vanguard Small-Cap Index Fund | 732,914 | 0.57% | $53.50M | 0.03% | Jun 30, 2026 |
| Vanguard Small-Cap Value Index Fund | 465,335 | 0.36% | $33.97M | 0.05% | Jun 30, 2026 |
| Vanguard Extended Market Index Fund | 382,398 | 0.30% | $27.92M | 0.03% | Jun 30, 2026 |
| U.S. Small Cap Value Portfolio | 370,642 | 0.29% | $26.13M | 0.13% | Jul 31, 2026 |
| State Street(R) SPDR(R) S&P(R) Dividend ETF | 346,456 | 0.27% | $25.29M | 0.12% | Jun 30, 2026 |
| U.S. Targeted Value Portfolio | 307,588 | 0.24% | $21.68M | 0.13% | Jul 31, 2026 |
| Dimensional U.S. Targeted Value ETF | 280,688 | 0.22% | $19.79M | 0.14% | Jul 31, 2026 |
| Dimensional US Small Cap Value ETF | 265,555 | 0.21% | $18.72M | 0.23% | Jul 31, 2026 |
| New Perspective Fund | 241,526 | 0.19% | $17.63M | 0.01% | Jun 30, 2026 |
| Nuveen Mid Cap Value Fund | 232,798 | 0.18% | $16.41M | 0.98% | Jul 31, 2026 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | % of shares | Latest filing |
|---|---|---|---|---|
| Albert Chao | Executive Chairman, Director | 94,079,818 | 73.62% | Aug 11, 2026 |
| James Chao | Senior Chairman, Director | 93,455,328 | 73.13% | Feb 23, 2026 |
| Tommy Darby | VP and CAO | – | – | Sep 1, 2026 |
| Jonathan Baksht | SVP and CFO | – | – | Jun 16, 2026 |
| Mark Steven Bender | EVP & CFO | 35,895 | 0.03% | May 14, 2026 |
| Brian John Powers | SVP, PEM Segment Head | – | – | Apr 6, 2026 |
| Robert F. Buesinger | EVP, PEM Segment Head | 34,482 | 0.03% | Mar 31, 2026 |
| L. Benjamin Ederington | EVP, Legal & External Affairs | 80,158 | 0.06% | Feb 23, 2026 |
| Scott Thomas Szwejbka | SVP, HIP Segment Head | 13,773 | 0.01% | Feb 23, 2026 |
| Jeffrey Adam Holy | VP and CAO | 5,124 | 0.00% | Feb 23, 2026 |
| Jean-Marc Gilson | President and CEO | – | – | Feb 23, 2026 |
| Thomas J. Janssens | SVP, Ops - PEM & Corp Logistic | 17,127 | 0.01% | Feb 24, 2025 |
| Kimberly S. Lubel | Director | 13,821 | 0.01% | Aug 17, 2026 |
| Mark A. McCollum | Director | 11,824 | 0.01% | Aug 17, 2026 |
| Bhavesh V. Patel | Director | – | – | Aug 17, 2026 |
| Roger A. Cregg | Director | 3,507 | 0.00% | Aug 17, 2026 |
| Jeffrey Wayne Sheets | Director | 14,927 | 0.01% | Aug 17, 2026 |
| R. Bruce Northcutt | Director | 23,351 | 0.02% | Aug 17, 2026 |
| Carolyn Chao Sabat | Director | 93,411,302 | 73.09% | Aug 17, 2026 |
| Catherine T. Chao | Director | 27,171 | 0.02% | Aug 17, 2026 |
| Michael J. Graff | Director | 23,310 | 0.02% | Aug 17, 2026 |
| David Tsung-Hung Chao | Director | 30,503 | 0.02% | Aug 17, 2026 |
| John Tsung-chen Chao | Director | 93,413,442 | 73.10% | Feb 23, 2026 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Albert Chao Executive Chairman, Director | Aug 11, 2026 | Sale | −7,489 | $79.70 | $596.87K | 674,264 |
| Albert Chao Executive Chairman, Director | Aug 11, 2026 | Sale | −31,384 | $80.42 | $2.52M | 642,880 |
| Albert Chao Executive Chairman, Director | Aug 11, 2026 | Option exercise | +38,873 | $61.87 | $2.41M | 681,753 |
| Carolyn Chao Sabat Director | Aug 8, 2026 | Option exercise | +2,168 | – | – | 5,748 |
| Mark A. McCollum Director | Aug 8, 2026 | Option exercise | +2,168 | – | – | 11,824 |
| Catherine T. Chao Director | Aug 8, 2026 | Option exercise | +2,168 | – | – | 7,748 |
| Roger A. Cregg Director | Aug 8, 2026 | Option exercise | +2,168 | – | – | 3,507 |
| Jeffrey Wayne Sheets Director | Aug 8, 2026 | Option exercise | +2,168 | – | – | 14,927 |
| R. Bruce Northcutt Director | Aug 8, 2026 | Option exercise | +2,168 | – | – | 23,351 |
| David Tsung-Hung Chao Director | Aug 8, 2026 | Option exercise | +2,168 | – | – | 11,080 |
| Kimberly S. Lubel Director | Aug 8, 2026 | Option exercise | +2,168 | – | – | 13,821 |
| Michael J. Graff Director | Aug 8, 2026 | Option exercise | +2,168 | – | – | 23,310 |
| Mark Steven Bender EVP & CFO | May 13, 2026 | Tax withholding | −5,284 | $97.34 | $514.34K | 35,895 |
| Mark Steven Bender EVP & CFO | May 12, 2026 | Option exercise | +13,164 | – | – | 41,179 |
| Robert F. Buesinger EVP, PEM Segment Head | Mar 27, 2026 | Sale | −4,000 | $115.25 | $461.00K | 34,482 |
| Mark Steven Bender EVP & CFO | Mar 27, 2026 | Sale | −16,413 | $112.54 | $1.85M | 28,015 |
| Mark Steven Bender EVP & CFO | Feb 27, 2026 | Option exercise | +6,494 | $86.54 | $561.99K | 74,535 |
| Mark Steven Bender EVP & CFO | Feb 27, 2026 | Returned to company | −12,693 | $98.20 | $1.25M | 61,842 |
| Mark Steven Bender EVP & CFO | Feb 27, 2026 | Sale | −16,988 | $100.91 | $1.71M | 44,854 |
| Mark Steven Bender EVP & CFO | Feb 27, 2026 | Sale | −421 | $101.52 | $42.74K | 44,433 |
| Mark Steven Bender EVP & CFO | Feb 27, 2026 | Option exercise | +6,199 | $65.81 | $407.96K | 68,041 |
| Albert Chao Executive Chairman, Director | Feb 20, 2026 | Tax withholding | −2,501 | $94.10 | $235.34K | 642,880 |
| Robert F. Buesinger EVP, PEM Segment Head | Feb 20, 2026 | Tax withholding | −326 | $94.10 | $30.68K | 38,482 |
| Scott Thomas Szwejbka SVP, HIP Segment Head | Feb 20, 2026 | Tax withholding | −91 | $94.10 | $8.56K | 13,773 |
| L. Benjamin Ederington EVP, Legal & External Affairs | Feb 20, 2026 | Tax withholding | −357 | $94.10 | $33.59K | 80,158 |
| John Tsung-chen Chao Director | Feb 20, 2026 | Tax withholding | −91 | $94.10 | $8.56K | 7,888 |
| James Chao Senior Chairman, Director | Feb 20, 2026 | Tax withholding | −1,569 | $94.10 | $147.64K | 49,774 |
| Jeffrey Adam Holy VP and CAO | Feb 20, 2026 | Tax withholding | −81 | $94.10 | $7.62K | 5,124 |
| Mark Steven Bender EVP & CFO | Feb 20, 2026 | Tax withholding | −445 | $94.10 | $41.87K | 61,842 |
| Albert Chao Executive Chairman, Director | Feb 19, 2026 | Award | +6,193 | – | – | 645,381 |
| Robert F. Buesinger EVP, PEM Segment Head | Feb 19, 2026 | Award | +1,301 | – | – | 38,808 |
| Scott Thomas Szwejbka SVP, HIP Segment Head | Feb 19, 2026 | Award | +365 | – | – | 13,864 |
| L. Benjamin Ederington EVP, Legal & External Affairs | Feb 19, 2026 | Award | +1,425 | – | – | 80,515 |
| John Tsung-chen Chao Director | Feb 19, 2026 | Award | +213 | – | – | 7,979 |
| James Chao Senior Chairman, Director | Feb 19, 2026 | Award | +3,884 | – | – | 51,343 |
| Jeffrey Adam Holy VP and CAO | Feb 19, 2026 | Award | +264 | – | – | 5,205 |
| Mark Steven Bender EVP & CFO | Feb 19, 2026 | Award | +1,777 | – | – | 62,287 |
| Scott Thomas Szwejbka SVP, HIP Segment Head | Feb 18, 2026 | Tax withholding | −295 | $98.95 | $29.19K | 13,499 |
| Jeffrey Adam Holy VP and CAO | Feb 18, 2026 | Tax withholding | −213 | $98.95 | $21.08K | 4,941 |
| L. Benjamin Ederington EVP, Legal & External Affairs | Feb 18, 2026 | Tax withholding | −978 | $98.95 | $96.77K | 79,090 |
| Albert Chao Executive Chairman, Director | Feb 18, 2026 | Tax withholding | −5,089 | $98.95 | $503.56K | 639,188 |
| James Chao Senior Chairman, Director | Feb 18, 2026 | Tax withholding | −2,664 | $98.95 | $263.60K | 47,459 |
| Mark Steven Bender EVP & CFO | Feb 18, 2026 | Tax withholding | −1,209 | $98.95 | $119.63K | 60,510 |
| John Tsung-chen Chao Director | Feb 18, 2026 | Tax withholding | −242 | $98.95 | $23.95K | 7,766 |
| Robert F. Buesinger EVP, PEM Segment Head | Feb 18, 2026 | Tax withholding | −903 | $98.95 | $89.35K | 37,507 |
| Scott Thomas Szwejbka SVP, HIP Segment Head | Feb 17, 2026 | Option exercise | +977 | – | – | 13,794 |
| Jeffrey Adam Holy VP and CAO | Feb 17, 2026 | Option exercise | +706 | – | – | 5,154 |
| L. Benjamin Ederington EVP, Legal & External Affairs | Feb 17, 2026 | Option exercise | +3,809 | – | – | 80,068 |
| Albert Chao Executive Chairman, Director | Feb 17, 2026 | Option exercise | +16,555 | – | – | 644,277 |
| James Chao Senior Chairman, Director | Feb 17, 2026 | Option exercise | +10,382 | – | – | 50,123 |
| Mark Steven Bender EVP & CFO | Feb 17, 2026 | Option exercise | +4,751 | – | – | 61,719 |
| John Tsung-chen Chao Director | Feb 17, 2026 | Option exercise | +570 | – | – | 7,608 |
| Robert F. Buesinger EVP, PEM Segment Head | Feb 17, 2026 | Option exercise | +3,478 | – | – | 38,410 |
| Albert Chao Executive Chairman, Director | Dec 22, 2025 | Sale | −30,604 | $73.80 | $2.26M | 628,243 |
| Albert Chao Executive Chairman, Director | Dec 22, 2025 | Option exercise | +81,673 | $44.42 | $3.63M | 668,558 |
| Albert Chao Executive Chairman, Director | Dec 22, 2025 | Sale | −9,711 | $72.82 | $707.16K | 658,847 |
| Albert Chao Executive Chairman, Director | Dec 22, 2025 | Sale | −521 | $74.44 | $38.78K | 627,722 |
| Roger A. Cregg Director | Dec 10, 2025 | Option exercise | +1,339 | – | – | 1,339 |
| Scott Thomas Szwejbka SVP, HIP Segment Head | Oct 2, 2025 | Tax withholding | −3,842 | $76.70 | $294.68K | 12,817 |
| Scott Thomas Szwejbka SVP, HIP Segment Head | Oct 1, 2025 | Option exercise | +10,840 | – | – | 16,659 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.
Planned insider sales
Notices of proposed sale filed on Form 144 before shares are sold
| Seller | Filed | Shares | Market value | Planned sale | Acquired through |
|---|---|---|---|---|---|
| Y. Chao Albert Officer, Director | Aug 11, 2026 | 38,873 | $3.12M | Aug 11, 2026 | Stock Option Exercise |
| Buesinger Robert Officer | Mar 30, 2026 | 4,000 | $461.00K | Mar 30, 2026 | Performance Shares |
| Bender Mark Officer | Mar 27, 2026 | 16,413 | $1.85M | Mar 27, 2026 | Restricted Stock |
| Bender Mark Officer | Feb 27, 2026 | 30,102 | $3.00M | Feb 27, 2026 | Restricted Stock |
| Y. Chao Albert Officer, Director | Dec 22, 2025 | 40,836 | $3.00M | Dec 22, 2025 | Stock Option Exercise |
| David Tsung-Hung Chao Director | Nov 26, 2024 | 1,750 | $232.75K | Nov 26, 2024 | RESTRICTED STOCK |
| David Tsung-Hung Chao Director | Nov 21, 2024 | 1,750 | $227.50K | Nov 21, 2024 | RESTRICTED STOCK |
| Thomas J. Janssens Officer | Aug 23, 2024 | 14,864 | $2.22M | Aug 23, 2024 | STOCK OPTION EXERCISE |
| Albert Chao Officer | Aug 16, 2024 | 45,298 | $6.57M | Aug 16, 2024 | STOCK OPTION EXERCISE |
| Robert F. Buesinger Officer | May 6, 2024 | 6,633 | $1.05M | May 6, 2024 | STOCK OPTION EXERCISE |
| Mark Steven Bender Officer | May 3, 2024 | 4,950 | $753.34K | May 3, 2024 | RESTRICTED STOCK |
| Johnathan Stevan Zoeller Officer | Mar 21, 2024 | 657 | $98.92K | Mar 21, 2024 | EXERCISED SHARES |
| Johnathan Stevan Zoeller Officer | Mar 8, 2024 | 2,776 | $394.44K | Mar 8, 2024 | STOCK OPTION EXERCISE |
| Mark Steven Bender Officer | Mar 5, 2024 | 4,804 | $678.57K | Mar 5, 2024 | RESTRICTED STOCK |
| Robert F. Buesinger Officer | Feb 29, 2024 | 16,670 | $2.38M | Feb 29, 2024 | STOCK OPTION EXERCISE |