Latest Period
Q1 2026
Security Snapshot
WESTLAKE CORP - COM (WLK) Institutional Ownership
CUSIP: 960413102
13F Institutional Holders and Ownership History from Q1 2014 to Q1 2026
Institutions Reporting
332
Shares (Excl. Options)
44,102,438
Price
$116.82
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- Type / Class
- Equity / COM
- Symbol
- WLK on NYSE
- Price per share
- $123.39
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 44,102,438
- Total reported value
- $5,148,106,324
- % of total 13F portfolios
- 0%
- Share change
- -1,736,810
- Value change
- -$100,051,226
- Number of holders
- 332
- Price from insider filings
- $123.39
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors
Key facts
- WLK - WESTLAKE CORP - COM is tracked under CUSIP 960413102.
- 332 institutions reported positions in Q1 2026.
- Schedule 13D/13G significant owner rows are not currently available.
Change
- Holder count moved from 293 to 332 between Q4 2025 and Q1 2026.
- Reported value moved from $3,430,829,837 to $5,148,106,324.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC Evidence
Latest holder context comes from 332 institutions filings for Q1 2026.
Security key
960413102
Latest holder period
Q1 2026
13F holders
332
13D/G owners
0
CIK / CUSIP context first
Open Q1 2026 holders
WLK full holder history
WESTLAKE CORP SEC filings
WESTLAKE CORP company facts
WESTLAKE CORP insider transactions
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 960413102:
As of 31 Mar 2026, 332 institutional investors reported holding 44,102,438 shares of WESTLAKE CORP - COM (WLK).
Institutional Holders of WESTLAKE CORP - COM (WLK) across Reporting Periods
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 44,102,438 | $5,148,106,324 | -$100,051,226 | $116.82 | 332 |
| 2025 Q4 | 46,394,569 | $3,430,829,837 | +$354,431,753 | $73.94 | 293 |
| 2025 Q3 | 41,501,786 | $3,197,756,199 | +$174,265,156 | $77.06 | 298 |
| 2025 Q2 | 39,331,374 | $2,988,909,852 | +$191,189,516 | $75.93 | 302 |
| 2025 Q1 | 35,955,773 | $3,595,027,641 | +$89,650,088 | $100.03 | 355 |
| 2024 Q4 | 35,062,846 | $4,016,892,549 | +$119,920,399 | $114.65 | 374 |
| 2024 Q3 | 33,626,464 | $5,051,906,427 | -$54,418,100 | $150.29 | 398 |
| 2024 Q2 | 33,918,505 | $4,913,906,263 | -$137,440,495 | $144.82 | 377 |
| 2024 Q1 | 34,008,729 | $5,196,165,363 | -$259,342,603 | $152.80 | 341 |
| 2023 Q4 | 35,887,292 | $5,022,573,110 | -$159,272,587 | $139.96 | 353 |
| 2023 Q3 | 37,104,188 | $4,625,180,937 | +$28,466,158 | $124.67 | 332 |
| 2023 Q2 | 36,790,936 | $4,397,162,133 | -$119,828,518 | $119.47 | 335 |
| 2023 Q1 | 37,754,020 | $4,377,194,379 | +$194,466,931 | $115.98 | 337 |
| 2022 Q4 | 36,255,792 | $3,718,239,748 | +$183,422,803 | $102.54 | 339 |
| 2022 Q3 | 34,810,948 | $3,025,069,640 | -$110,809,833 | $86.88 | 305 |
| 2022 Q2 | 35,641,273 | $3,493,033,437 | +$36,281,949 | $98.02 | 337 |
| 2022 Q1 | 35,524,019 | $4,384,712,928 | +$126,016,952 | $123.40 | 316 |
| 2021 Q4 | 34,660,108 | $3,365,576,971 | +$1,084,841 | $97.13 | 286 |
| 2021 Q3 | 34,506,444 | $3,148,158,781 | +$92,156,053 | $91.14 | 261 |
| 2021 Q2 | 33,534,876 | $3,021,041,387 | -$109,607,743 | $90.09 | 267 |
| 2021 Q1 | 34,753,905 | $3,085,828,789 | +$119,243,678 | $88.79 | 231 |
| 2020 Q4 | 33,570,512 | $2,739,246,603 | -$115,149,486 | $81.60 | 217 |
| 2020 Q3 | 35,059,178 | $2,216,373,693 | -$89,007,831 | $63.22 | 193 |
| 2020 Q2 | 36,559,600 | $1,961,728,082 | +$42,236,823 | $53.65 | 202 |
| 2020 Q1 | 35,968,215 | $1,372,969,054 | -$173,454,128 | $38.17 | 209 |
| 2019 Q4 | 37,844,344 | $2,654,460,585 | -$125,326,827 | $70.15 | 240 |
| 2019 Q3 | 39,654,117 | $2,598,070,855 | -$29,694,886 | $65.52 | 237 |
| 2019 Q2 | 40,031,713 | $2,780,541,703 | +$278,790,189 | $69.46 | 259 |
| 2019 Q1 | 36,742,832 | $2,493,245,632 | +$51,277,628 | $67.86 | 294 |
| 2018 Q4 | 36,040,512 | $2,383,310,866 | -$183,514,913 | $66.17 | 291 |
| 2018 Q3 | 38,535,949 | $3,202,276,134 | -$172,831,006 | $83.11 | 306 |
| 2018 Q2 | 39,840,070 | $4,288,718,458 | +$111,806,642 | $107.63 | 324 |
| 2018 Q1 | 38,985,938 | $4,333,054,789 | +$10,081,289 | $111.15 | 316 |
| 2017 Q4 | 39,192,909 | $4,175,042,471 | -$70,389,107 | $106.53 | 280 |
| 2017 Q3 | 40,165,187 | $3,337,608,288 | -$99,816,402 | $83.09 | 237 |
| 2017 Q2 | 41,842,412 | $2,770,219,564 | +$222,731,913 | $66.21 | 212 |
| 2017 Q1 | 39,690,231 | $2,621,528,303 | +$158,639,366 | $66.05 | 216 |
| 2016 Q4 | 38,874,176 | $2,176,941,155 | -$5,398,387 | $55.99 | 218 |
| 2016 Q3 | 38,148,273 | $2,039,094,098 | -$6,470,747 | $53.50 | 219 |
| 2016 Q2 | 38,742,091 | $1,662,382,659 | -$2,809,878 | $42.92 | 234 |
| 2016 Q1 | 38,882,667 | $1,800,612,928 | +$114,064,542 | $46.30 | 266 |
| 2015 Q4 | 35,758,551 | $1,942,663,153 | -$99,305,576 | $54.32 | 267 |
| 2015 Q3 | 37,505,219 | $1,945,951,994 | -$29,957,723 | $51.89 | 246 |
| 2015 Q2 | 37,582,754 | $2,577,004,540 | -$117,001,035 | $68.59 | 261 |
| 2015 Q1 | 39,195,636 | $2,815,337,611 | +$99,040,768 | $71.94 | 264 |
| 2014 Q4 | 38,540,911 | $2,353,942,914 | -$40,803,102 | $61.09 | 275 |
| 2014 Q3 | 37,804,255 | $3,273,499,839 | -$71,497,823 | $86.59 | 280 |
| 2014 Q2 | 38,509,330 | $3,226,358,463 | +$39,478,524 | $83.76 | 265 |
| 2014 Q1 | 38,357,918 | $2,538,144,885 | +$1,220,257,423 | $66.18 | 242 |