WLK
WESTLAKE CORP
Industrial Organic ChemicalsNYSELarge accelerated filer
Total Trades
40
Buys
1
Sells
24
Largest Trade
$1M+
Insiders
7
Institutional Funds
240
Inst. Value
$1M+
Activist Filings
3
Insider Trades
| Insider | Title | Type | Value | Shares | Price | Date |
|---|---|---|---|---|---|---|
| Bender Mark Steven | EVP & CFO | SELL | $1M+ | 17K | $100.92 | Mar 2, 2026 |
| Bender Mark Steven | EVP & CFO | EXERCISE | $500K+ | 13K | $76.42 | Mar 2, 2026 |
| Chao Albert | Executive Chairman | SELL | $1M+ | 41K | $73.57 | Dec 23, 2025 |
| Chao Albert | Executive Chairman | EXERCISE | $1M+ | 82K | $44.42 | Dec 23, 2025 |
| Buesinger Robert F. | EVP | BUY | $1K–$15K | 83 | $93.39 | Jun 9, 2025 |
| Buesinger Robert F. | EVP | SELL | $1K–$15K | 83 | $72.70 | Jun 9, 2025 |
| Chao David Tsung-Hung | Director | SELL | $100K–$500K | 2K | $129.08 | Dec 2, 2024 |
| Chao David Tsung-Hung | Director | SELL | $100K–$500K | 2K | $130.00 | Nov 25, 2024 |
| Bender Mark Steven | EVP & CFO | SELL | $500K+ | 5K | $137.57 | Feb 28, 2024 |
| Buesinger Robert F. | EVP | SELL | $500K+ | 4K | $130.50 | Nov 17, 2023 |
| Chao David Tsung-Hung | Director | SELL | $100K–$500K | 1K | $131.00 | Aug 24, 2023 |
| Buesinger Robert F. | EVP | SELL | $50K–$100K | 1K | $98.94 | Sep 1, 2022 |
| Zoeller Johnathan Stevan | VP & Chief Account… | SELL | $50K–$100K | 542 | $107.08 | Aug 29, 2022 |
| Buesinger Robert F. | EVP | SELL | $1M+ | 14K | $129.47 | May 31, 2022 |
| Buesinger Robert F. | EVP | EXERCISE | $1M+ | 14K | $100.61 | May 31, 2022 |
| Chao Albert | President & CEO | SELL | $1M+ | 38K | $130.38 | May 23, 2022 |
| Chao Albert | President & CEO | EXERCISE | $1M+ | 38K | $45.70 | May 23, 2022 |
| Kearns Roger L. | COO and EVP - PEM | SELL | $1M+ | 8K | $136.24 | May 18, 2022 |
| Kearns Roger L. | COO and EVP - PEM | EXERCISE | $500K+ | 8K | $79.83 | May 18, 2022 |
| Ederington L. Benjamin | EVP | EXERCISE | $500K+ | 13K | $44.42 | May 6, 2022 |
| Ederington L. Benjamin | EVP | SELL | $1M+ | 13K | $139.81 | May 6, 2022 |
| Bender Mark Steven | EVP and CFO | SELL | $500K+ | 6K | $124.35 | Apr 1, 2022 |
| Bender Mark Steven | EVP and CFO | EXERCISE | $100K–$500K | 6K | $70.61 | Apr 1, 2022 |
| Bender Mark Steven | EVP and CFO | EXERCISE | $100K–$500K | 6K | $72.82 | Mar 31, 2022 |
| Bender Mark Steven | EVP and CFO | SELL | $500K+ | 6K | $124.80 | Mar 31, 2022 |
| Bender Mark Steven | EVP and CFO | SELL | $100K–$500K | 4K | $122.44 | Mar 30, 2022 |
| Bender Mark Steven | EVP and CFO | EXERCISE | $100K–$500K | 4K | $72.82 | Mar 30, 2022 |
| Kearns Roger L. | COO and EVP - PEM | EXERCISE | $500K+ | 10K | $83.86 | Mar 28, 2022 |
| Kearns Roger L. | COO and EVP - PEM | SELL | $1M+ | 10K | $126.00 | Mar 28, 2022 |
| Bender Mark Steven | EVP and CFO | SELL | $1M+ | 8K | $125.34 | Mar 28, 2022 |
| Bender Mark Steven | EVP and CFO | EXERCISE | $500K+ | 8K | $72.82 | Mar 28, 2022 |
| Bender Mark Steven | EVP and CFO | EXERCISE | $500K+ | 8K | $72.82 | Mar 25, 2022 |
| Bender Mark Steven | EVP and CFO | SELL | $1M+ | 8K | $125.38 | Mar 25, 2022 |
| Bender Mark Steven | EVP and CFO | EXERCISE | $100K–$500K | 6K | $72.82 | Mar 24, 2022 |
| Bender Mark Steven | EVP and CFO | SELL | $500K+ | 6K | $125.17 | Mar 24, 2022 |
| Buesinger Robert F. | EVP | SELL | $1M+ | 23K | $117.61 | Mar 14, 2022 |
| Buesinger Robert F. | EVP | EXERCISE | $1M+ | 23K | $74.94 | Mar 14, 2022 |
| Buesinger Robert F. | EVP | SELL | $100K–$500K | 3K | $115.55 | Mar 10, 2022 |
| Zoeller Johnathan Stevan | VP and CAO | SELL | $100K–$500K | 1K | $110.39 | Mar 2, 2022 |
| Zoeller Johnathan Stevan | VP and CAO | EXERCISE | $50K–$100K | 1K | $65.81 | Mar 2, 2022 |
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Institutional Ownership
13F filings as of Dec 31, 2025 · 240 funds holding
| Fund | Shares | Value | Type |
|---|---|---|---|
| Capital World Investors | 2.2M | $1M+ | SH |
| DIMENSIONAL FUND ADVISORS LP | 1.8M | $1M+ | SH |
| STATE STREET CORP | 1.4M | $1M+ | SH |
| VICTORY CAPITAL MANAGEMENT INC | 1.1M | $1M+ | SH |
| JACOBS LEVY EQUITY MANAGEMENT, INC | 668K | $1M+ | SH |
| THOMPSON SIEGEL & WALMSLEY LLC | 536K | $1M+ | SH |
| GEODE CAPITAL MANAGEMENT, LLC | 480K | $1M+ | SH |
| ProShare Advisors LLC | 435K | $1M+ | SH |
| Erste Asset Management GmbH | 420K | $1M+ | SH |
| ANTIPODES PARTNERS Ltd | 417K | $1M+ | SH |
| Merewether Investment Management, LP | 388K | $1M+ | SH |
| VOLORIDGE INVESTMENT MANAGEMENT, LLC | 349K | $1M+ | SH |
| NEW YORK STATE COMMON RETIREMENT FUND | 310K | $1M+ | SH |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC | 297K | $1M+ | SH |
| VAN LANSCHOT KEMPEN INVESTMENT MANAGEMENT N.V. | 236K | $1M+ | SH |
| VANGUARD GROUP INC | 208K | $1M+ | SH |
| DEPRINCE RACE & ZOLLO INC | 204K | $1M+ | SH |
| DIAMOND HILL CAPITAL MANAGEMENT INC | 190K | $1M+ | SH |
| NORGES BANK | 181K | $1M+ | SH |
| FIRST TRUST ADVISORS LP | 146K | $1M+ | SH |
Activist & 5%+ Owners
SC 13D/13G filings — investors holding 5%+ of outstanding shares