WESTLAKE CORP (WLK) Institutional Ownership Changes & 13F Activity
WESTLAKE CORP (WLK). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings (Q1 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions in the latest reporting period. Notable filers include Wellington Management Group Llp, Fmr Llc, Victory Capital Management Inc, Orbis Allan Gray Ltd, and Goldman Sachs Group Inc.
| Institution | Type | Change in shares | Change Position % | Shares | Reported stock balance | Portfolio quarter | Filing date |
|---|---|---|---|---|---|---|---|
| Pickering Energy Partners Lp | Buy | +1,000 | — | 1,000 | $116.82K | Q1 2026 | Jul 23, 2026 |
| Wells Fargo & Company/Mn | Buy | +14,826 | +16.1% | 106,705 | $12.47M | Q1 2026 | Jul 08, 2026 |
| Bank Of America Corp | Buy | +52,551 | +28.5% | 236,986 | $27.68M | Q1 2026 | May 18, 2026 |
| Edgestream Partners, L.P. | Buy | +10,586 | +149.2% | 17,681 | $2.07M | Q1 2026 | May 18, 2026 |
| California State Teachers Retirement System | Buy | +8,361 | +23.2% | 44,459 | $5.19M | Q1 2026 | May 18, 2026 |
| Amundi | Buy | +1,997 | — | 1,997 | $233.29K | Q1 2026 | May 18, 2026 |
| Wellington Management Group Llp | Sell | -2,427,200 | -57.5% | 1,793,517 | $209.52M | Q1 2026 | May 15, 2026 |
| Fmr Llc | Buy | +1,083,630 | +473.5% | 1,312,473 | $153.32M | Q1 2026 | May 15, 2026 |
| Victory Capital Management Inc | Sell | -1,068,241 | -95.9% | 45,578 | $5.32M | Q1 2026 | May 15, 2026 |
| Orbis Allan Gray Ltd | Buy | +906,884 | +20.7% | 5,293,519 | $618.39M | Q1 2026 | May 15, 2026 |
| Goldman Sachs Group Inc | Buy | +639,374 | +84.8% | 1,393,327 | $162.77M | Q1 2026 | May 15, 2026 |
| Citadel Advisors Llc | Buy | +512,283 | +252.0% | 715,586 | $83.59M | Q1 2026 | May 15, 2026 |
| Holocene Advisors, Lp | Sell | -490,587 | -40.2% | 730,035 | $85.28M | Q1 2026 | May 15, 2026 |
| Balyasny Asset Management L.P. | Buy | +369,672 | — | 369,672 | $43.19M | Q1 2026 | May 15, 2026 |
| Millennium Management Llc | Sell | -342,757 | -80.1% | 84,997 | $9.93M | Q1 2026 | May 15, 2026 |
| Jacobs Levy Equity Management, Inc | Sell | -319,370 | -47.8% | 349,035 | $40.77M | Q1 2026 | May 15, 2026 |
| Woodline Partners Lp | Sell | -291,084 | -46.3% | 337,075 | $39.38M | Q1 2026 | May 15, 2026 |
| Morgan Stanley | Sell | -273,115 | -36.0% | 486,508 | $56.83M | Q1 2026 | May 15, 2026 |
| D. E. Shaw & Co., Inc. | Sell | -253,098 | -52.0% | 233,183 | $27.24M | Q1 2026 | May 15, 2026 |
| Engineers Gate Manager Lp | Sell | -246,756 | -85.3% | 42,499 | $4.96M | Q1 2026 | May 15, 2026 |
| Aqr Capital Management Llc | Buy | +239,535 | +1166.5% | 260,070 | $30.38M | Q1 2026 | May 15, 2026 |
| Price T Rowe Associates Inc | Buy | +198,742 | +9.0% | 2,407,457 | $281.24M | Q1 2026 | May 15, 2026 |
| Brandes Investment Partners, Lp | Buy | +172,323 | +10.3% | 1,842,650 | $215.26M | Q1 2026 | May 15, 2026 |
| Merewether Investment Management, Lp | Sell | -168,200 | -43.3% | 219,900 | $25.69M | Q1 2026 | May 15, 2026 |
| Man Group Plc | Buy | +160,286 | — | 160,286 | $18.72M | Q1 2026 | May 15, 2026 |
| Capstone Investment Advisors, Llc | Buy | +132,689 | +4254.2% | 135,808 | $15.87M | Q1 2026 | May 15, 2026 |
| Yaupon Capital Management Lp | Buy | +107,044 | — | 107,044 | $12.50M | Q1 2026 | May 15, 2026 |
| Mirae Asset Global Etfs Holdings Ltd. | Buy | +67,090 | +7.7% | 943,975 | $110.27M | Q1 2026 | May 15, 2026 |
| Janus Henderson Group Plc | Sell | -64,810 | -19.4% | 269,783 | $31.52M | Q1 2026 | May 15, 2026 |
| Lloyd Harbor Capital Management, Llc | Buy | +62,000 | — | 62,000 | $7.24M | Q1 2026 | May 15, 2026 |
Frequently asked questions about WLK activity
Which institutional owners are buying WLK?
Institutional owners buying WLK include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.
What does "buy" mean in WLK activity?
"Buy" means an investor increased their reported position in WLK compared to the prior reporting period. This reflects growing exposure to WESTLAKE CORP (WLK) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).
Is institutional interest in WLK increasing?
Institutional interest in WLK can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.
Related WLK Institutional Insights
- WLK Overview
- WLK 13F Institutional Holders
- WLK Superinvestors
- Basic Materials Sector Institutional Ownership
- Basic Materials Sector Portfolio Overlap
- Institutional Portfolio Overlap & Shared Holdings
- Most Bought Basic Materials Stocks By Institutional Investors
- Most Sold Basic Materials Stocks By Institutional Investors
- WLK Insider Trading & SEC Form 4 Activity
- WLK Articles
- Top Institutional Investor Stock Rankings