Vault-13

WESTLAKE CORPORATION WLK

COM · Common Stock · CUSIP 960413102 · ISIN US9604131022

American petrochemical company

362 institutional holders -16 vs Q4 2024
36,305,23136.3m shares reported held*
28.3% of all shares outstanding*
$3.6bnreported value*
36 new 147 added 115 reduced 60 sold out net bought ≈ $137.0m (+1.4m shares)

* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($9.7m this quarter). Holder counts are more reliable. Shares outstanding: 128.2m as of 2025-04-25, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $99.99. Options: 4 managers hold calls ($3.0m notional), 8 hold puts ($68.4m).

Trends to Q1 2025

Institutional holders

Managers reporting a position, each quarter

0200400600Q3 22: 321Q4 22: 343Q1 23: 342Q2 23: 340Q3 23: 335Q4 23: 357Q1 24: 347Q2 24: 382Q3 24: 403Q4 24: 378Q1 25: 362362Q3 22Q1 23Q3 23Q1 24Q3 24Q1 25
Numbers
QuarterHolders
Q3 2022321
Q4 2022343
Q1 2023342
Q2 2023340
Q3 2023335
Q4 2023357
Q1 2024347
Q2 2024382
Q3 2024403
Q4 2024378
Q1 2025362

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
4000400Q2 23: 143 bought or addedQ2 23: 176 cut or sold outQ3 23: 124 bought or addedQ3 23: 182 cut or sold outQ3 23Q4 23: 145 bought or addedQ4 23: 165 cut or sold outQ1 24: 159 bought or addedQ1 24: 170 cut or sold outQ1 24Q2 24: 187 bought or addedQ2 24: 164 cut or sold outQ3 24: 210 bought or addedQ3 24: 170 cut or sold outQ3 24Q4 24: 174 bought or addedQ4 24: 195 cut or sold outQ1 25: 183 bought or addedQ1 25: 175 cut or sold outQ1 25
Numbers
QuarterBought or addedCut or sold out
Q2 2023143176
Q3 2023124182
Q4 2023145165
Q1 2024159170
Q2 2024187164
Q3 2024210170
Q4 2024174195
Q1 2025183175

Calls vs puts

Options held, notional value, last 4 quarters. P/C = puts ÷ calls

CallsPuts
$0$25m$50m$75m$100mQ2 24 calls: $49.8mQ2 24 puts: $23.7mQ2 24P/C 0.48Q3 24 calls: $25.3mQ3 24 puts: $97.7mQ3 24P/C 3.86Q4 24 calls: $14.2mQ4 24 puts: $67.6mQ4 24P/C 4.76Q1 25 calls: $3.0mQ1 25 puts: $68.4mQ1 25P/C 23.18
Numbers
QuarterCallsPutsP/C
Q2 2024$49.8m$23.7m0.48
Q3 2024$25.3m$97.7m3.86
Q4 2024$14.2m$67.6m4.76
Q1 2025$3.0m$68.4m23.18

Biggest buyers

MILLENNIUM MANAGEMENT LLC Added +708,142+708.1k
VICTORY CAPITAL MANAGEMENT INC Added +586,178+586.2k
Ilex Capital Partners (UK) LLP Added +546,991+547.0k
STATE STREET CORP Added +435,857+435.9k
BRANDES INVESTMENT PARTNERS, LP New +421,020+421.0k
Allspring Global Investments Holdings, LLC Added +175,306+175.3k
CITADEL ADVISORS LLC Added +172,525+172.5k
BANK OF AMERICA CORP /DE/ Added +171,247+171.2k
TWO SIGMA INVESTMENTS, LP Added +161,751+161.8k
VOLORIDGE INVESTMENT MANAGEMENT, LLC Added +127,940+127.9k

Biggest sellers

FIRST TRUST ADVISORS LP Reduced -660,957-661.0k
Balyasny Asset Management L.P. Reduced -471,274-471.3k
VANGUARD GROUP INC Reduced -327,663-327.7k
Orbis Allan Gray Ltd Sold out -299,802-299.8k
Merewether Investment Management, LP Sold out -273,637-273.6k
Amundi Reduced -227,559-227.6k
1832 Asset Management L.P. Reduced -222,260-222.3k
READYSTATE ASSET MANAGEMENT LP Sold out -115,728-115.7k
SCHRODER INVESTMENT MANAGEMENT GROUP Reduced -114,728-114.7k
RENAISSANCE TECHNOLOGIES LLC Reduced -70,600-70.6k

Biggest calls

SUSQUEHANNA INTERNATIONAL GROUP, LLP Reduced $1.7m16.6k shares
CITADEL ADVISORS LLC Reduced $1.1m11.4k shares
SIMPLEX TRADING, LLC Reduced $150.0k1.5k shares
CONCOURSE FINANCIAL GROUP SECURITIES, INC. Unchanged $00 shares

Biggest puts

BARCLAYS PLC Added $52.3m522.5k shares
JANE STREET GROUP, LLC Added $6.1m61.4k shares
Walnut Level Capital LLC New $5.0m50.0k shares
CITADEL ADVISORS LLC Reduced $4.6m45.9k shares
WOLVERINE TRADING, LLC New $356.8k3.6k shares
SIMPLEX TRADING, LLC Reduced $50.0k500 shares
Mercuria Capital Strategies, LLC New $5.4k2.0k shares
CONCOURSE FINANCIAL GROUP SECURITIES, INC. Unchanged $00 shares

Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.

Insider purchases and sales in Q1 2025

Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.

Officers and directors buying vs selling

Number of people, by quarter (10% owners not included)

BuyingSelling
202Q2 23: 0 buyingQ2 23: 0 sellingQ3 23: 0 buyingQ3 23: 1 sellingQ3 23Q4 23: 0 buyingQ4 23: 1 sellingQ1 24: 0 buyingQ1 24: 2 sellingQ1 24Q2 24: 0 buyingQ2 24: 2 sellingQ3 24: 0 buyingQ3 24: 0 sellingQ3 24Q4 24: 0 buyingQ4 24: 1 sellingQ1 25: 0 buyingQ1 25: 0 sellingQ1 25
Numbers
QuarterBuyingBoughtSellingSoldSold under a plan
Q2 20230—0——
Q3 20230—1$131.0k—
Q4 20230—1$550.1k—
Q1 20240—2$1.9m—
Q2 20240—2$1.3m—
Q3 20240—0——
Q4 20240—1$453.4k—
Q1 20250—0——

None reported in Q1 2025.

Holders, Q1 2025

#ManagerLocationShares Value% of their portfolioChangeShares change
1 VICTORY CAPITAL MANAGEMENT INC 0.40% of their portfolio San Antonio, TX 3,900,0253.9m $390.1m $390.1m 0.40% Added +586.2k +586,178
2 BlackRock, Inc. 0.01% of their portfolio New York, NY 3,660,4063.7m $366.2m $366.2m 0.01% Added +2.5k +2,511
3 VANGUARD GROUP INC 0.01% of their portfolio Valley Forge, PA 3,550,3103.6m $355.1m $355.1m 0.01% Reduced -327.7k -327,663
4 STATE STREET CORP 0.01% of their portfolio BOSTON, MA 1,630,1061.6m $163.1m $163.1m 0.01% Added +435.9k +435,857
5 FMR LLC 0.01% of their portfolio BOSTON, MA 1,548,8661.5m $154.9m $154.9m 0.01% Added +110.3k +110,263
6 Capital World Investors 0.02% of their portfolio LOS ANGELES, CA 1,290,1281.3m $129.1m $129.1m 0.02% Added +2.6k +2,627
7 GOLDMAN SACHS GROUP INC 0.02% of their portfolio NEW YORK, NY 1,041,1901.0m $104.2m $104.2m 0.02% Added +102.3k +102,268
8 DIMENSIONAL FUND ADVISORS LP 0.02% of their portfolio AUSTIN, TX 939,669939.7k $94.0m $94.0m 0.02% Added +5.5k +5,547
9 MILLENNIUM MANAGEMENT LLC 0.09% of their portfolio NEW YORK, NY 901,229901.2k $90.1m $90.1m 0.09% Added +708.1k +708,142
10 MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. 0.18% of their portfolio CAUSEWAY BAY, K3 853,831853.8k $85.4m $85.4m 0.18% Reduced -28.6k -28,643
11 CITADEL ADVISORS LLC 0.08% of their portfolio MIAMI, FL 852,856852.9k $85.3m $85.3m 0.08% Added +172.5k +172,525
12 JACOBS LEVY EQUITY MANAGEMENT, INC 0.31% of their portfolio FLORHAM PARK, NJ 775,801775.8k $77.6m $77.6m 0.31% Reduced -23.4k -23,449
13 Nuveen, LLC 0.02% of their portfolio CHARLOTTE, NC 729,521729.5k $73.0m $73.0m 0.02% First filing
14 Ilex Capital Partners (UK) LLP 2.86% of their portfolio London, X0 699,007699.0k $69.9m $69.9m 2.86% Added +547.0k +546,991
15 UBS Group AG 0.01% of their portfolio ZURICH, V8 609,078609.1k $60.9m $60.9m 0.01% Added +51.5k +51,518
16 GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio BOSTON, MA 576,779576.8k $57.6m $57.6m 0.00% Added +18.8k +18,836
17 Allspring Global Investments Holdings, LLC 0.10% of their portfolio CHARLOTTE, NC 551,766551.8k $55.2m $55.2m 0.10% Added +175.3k +175,306
18 Balyasny Asset Management L.P. 0.13% of their portfolio Chicago, IL 521,876521.9k $52.2m $52.2m 0.13% Reduced -471.3k -471,274
19 BRANDES INVESTMENT PARTNERS, LP 0.43% of their portfolio LA JOLLA, CA 421,020421.0k $42.1m $42.1m 0.43% New
20 ExodusPoint Capital Management, LP 0.55% of their portfolio NEW YORK, NY 417,760417.8k $41.8m $41.8m 0.55% Added +73.0k +72,970
21 JANUS HENDERSON GROUP PLC 0.02% of their portfolio LONDON, X0 394,521394.5k $39.1m $39.1m 0.02% Added +22.3k +22,325
22 UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.01% of their portfolio NEW YORK, NY 371,175371.2k $37.1m $37.1m 0.01% Added +24.4k +24,386
23 NORGES BANK 0.01% of their portfolio OSLO, Q8 368,875368.9k $36.9m $36.9m 0.01% Reduced -37.8k -37,837
24 VOLORIDGE INVESTMENT MANAGEMENT, LLC 0.13% of their portfolio JUPITER, FL 346,970347.0k $34.7m $34.7m 0.13% Added +127.9k +127,940
25 NORTHERN TRUST CORP 0.00% of their portfolio CHICAGO, IL 314,618314.6k $31.5m $31.5m 0.00% Added +9.0k +8,955
26 RENAISSANCE TECHNOLOGIES LLC 0.04% of their portfolio NEW YORK, NY 280,100280.1k $28.0m $28.0m 0.04% Reduced -70.6k -70,600
27 TWO SIGMA INVESTMENTS, LP 0.06% of their portfolio NEW YORK, NY 266,071266.1k $26.6m $26.6m 0.06% Added +161.8k +161,751
28 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 262,556262.6k $26.3m $26.3m 0.00% Reduced -39.0k -38,994
29 ProShare Advisors LLC 0.06% of their portfolio BETHESDA, MD 260,323260.3k $26.0m $26.0m 0.06% Added +11.3k +11,272
30 SCHRODER INVESTMENT MANAGEMENT GROUP 0.02% of their portfolio London, X0 249,546249.5k $24.7m $24.7m 0.02% Reduced -114.7k -114,728
31 CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio SAN FRANCISCO, CA 244,497244.5k $24.5m $24.5m 0.00% Added +8.1k +8,143
32 Squarepoint Ops LLC 0.06% of their portfolio NEW YORK, NY 232,058232.1k $23.2m $23.2m 0.06% Added +53.8k +53,753
33 DEPRINCE RACE & ZOLLO INC 0.48% of their portfolio Winter Park, FL 230,488230.5k $23.1m $23.1m 0.48% Added +12.2k +12,209
34 D. E. Shaw & Co., Inc. 0.03% of their portfolio New York, NY 228,357228.4k $22.8m $22.8m 0.03% Reduced -24.4k -24,390
35 BANK OF AMERICA CORP /DE/ 0.00% of their portfolio CHARLOTTE, NC 221,443221.4k $22.2m $22.2m 0.00% Added +171.2k +171,247
36 Bank of New York Mellon Corp 0.00% of their portfolio NEW YORK, NY 219,679219.7k $22.0m $22.0m 0.00% Reduced -6.3k -6,297
37 BANK OF MONTREAL /CAN/ 0.01% of their portfolio TORONTO, A6 210,224210.2k $21.0m $21.0m 0.01% Added +60.6k +60,650
38 Alyeska Investment Group, L.P. 0.08% of their portfolio CHICAGO, IL 192,876192.9k $19.3m $19.3m 0.08% Added +87.7k +87,675
39 FIRST TRUST ADVISORS LP 0.01% of their portfolio Wheaton, IL 166,559166.6k $16.7m $16.7m 0.01% Reduced -661.0k -660,957
40 TWO SIGMA ADVISERS, LP 0.04% of their portfolio NEW YORK, NY 166,100166.1k $16.6m $16.6m 0.04% Added +63.1k +63,100
41 ROBOTTI ROBERT 3.30% of their portfolio NEW YORK, NY 164,696164.7k $16.5m $16.5m 3.30% Added +397 +397
42 1832 Asset Management L.P. 0.03% of their portfolio TORONTO, A6 153,740153.7k $15.4m $15.4m 0.03% Reduced -222.3k -222,260
43 Erste Asset Management GmbH 0.20% of their portfolio VIENNA, C4 153,201153.2k $15.3m $15.3m 0.20% Added +12.0k +12,000
44 Legal & General Group Plc 0.00% of their portfolio London, X0 144,995145.0k $14.5m $14.5m 0.00% Reduced -12.7k -12,653
45 Man Group plc 0.04% of their portfolio LONDON, X0 140,891140.9k $14.1m $14.1m 0.04% Added +102.1k +102,092
46 Invesco Ltd. 0.00% of their portfolio ATLANTA, GA 134,380134.4k $13.4m $13.4m 0.00% Reduced -13.6k -13,636
47 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 129,035129.0k $12.9m $12.9m 0.00% Added +17.8k +17,806
48 Quantinno Capital Management LP 0.08% of their portfolio NEW YORK, NY 127,513127.5k $12.8m $12.8m 0.08% Added +38.9k +38,924
49 AMERIPRISE FINANCIAL INC 0.00% of their portfolio MINNEAPOLIS, MN 118,923118.9k $11.9m $11.9m 0.00% Added +11.5k +11,527
50 Drummond Knight Asset Management Pty Ltd 5.89% of their portfolio CROWS NEST, NSW, C3 117,231117.2k $11.7m $11.7m 5.89% Added +32.2k +32,231
51 Russell Investments Group, Ltd. 0.02% of their portfolio Seattle, WA 116,603116.6k $11.7m $11.7m 0.02% Reduced -13.1k -13,068
52 Qube Research & Technologies Ltd 0.02% of their portfolio LONDON, X0 115,800115.8k $11.6m $11.6m 0.02% Reduced -2.9k -2,920
53 RAYMOND JAMES FINANCIAL INC 0.00% of their portfolio ST. PETERSBURG, FL 112,945112.9k $11.3m $11.3m 0.00% Reduced -4.0k -4,028
54 LAZARD ASSET MANAGEMENT LLC 0.02% of their portfolio NEW YORK, NY 111,513111.5k $11.2m $11.2m 0.02% Added +12.1k +12,081
55 Swiss National Bank 0.01% of their portfolio ZURICH, V8 109,000109.0k $10.9m $10.9m 0.01% Unchanged
56 BARCLAYS PLC 0.00% of their portfolio LONDON, X0 106,820106.8k $10.7m $10.7m 0.00% Reduced -25.9k -25,896
57 STOREBRAND ASSET MANAGEMENT AS 0.03% of their portfolio LYSAKER, Q8 106,745106.7k $10.7m $10.7m 0.03% Reduced -5.7k -5,719
58 RHUMBLINE ADVISERS 0.01% of their portfolio BOSTON, MA 100,439100.4k $10.0m $10.0m 0.01% Added +2.4k +2,383
59 Holocene Advisors, LP 0.03% of their portfolio New York, NY 99,07399.1k $9.9m $9.9m 0.03% Added +49.8k +49,769
60 WEDGE CAPITAL MANAGEMENT L L P/NC 0.18% of their portfolio CHARLOTTE, NC 94,63894.6k $9.5m $9.5m 0.18% Added +15.5k +15,460
61 Walnut Level Capital LLC 7.39% of their portfolio DENVER, CO 92,50092.5k $9.3m $9.3m 7.39% Added +20.2k +20,215
62 SPROTT INC. 0.53% of their portfolio TORONTO, A6 90,00090.0k $9.0m $9.0m 0.53% Added +25.0k +25,000
63 JANE STREET GROUP, LLC 0.02% of their portfolio NEW YORK, NY 85,94085.9k $8.6m $8.6m 0.02% Added +78.3k +78,256
64 Sumitomo Mitsui Trust Group, Inc. 0.01% of their portfolio CHIYODA-KU, TOKYO, M0 79,08979.1k $7.9m $7.9m 0.01% Reduced -374 -374
65 PRINCIPAL FINANCIAL GROUP INC 0.00% of their portfolio DES MOINES, IA 76,99677.0k $7.7m $7.7m 0.00% Added +315 +315
66 Cerity Partners LLC 0.02% of their portfolio NEW YORK, NY 74,92874.9k $7.5m $7.5m 0.02% Reduced -7.7k -7,685
67 HITE Hedge Asset Management LLC 0.44% of their portfolio BRAINTREE, MA 71,47571.5k $7.1m $7.1m 0.44% Added +10.8k +10,827
68 ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio NASHVILLE, TN 68,46968.5k $6.8m $6.8m 0.00% Added +4.7k +4,746
69 HRT FINANCIAL LP 0.05% of their portfolio NEW YORK, NY 68,30468.3k $6.8m $6.8m 0.05% New
70 WELLS FARGO & COMPANY/MN 0.00% of their portfolio SAN FRANCISCO, CA 61,20661.2k $6.1m $6.1m 0.00% Added +8.5k +8,491
71 Janney Montgomery Scott LLC 0.02% of their portfolio PHILADELPHIA, PA 61,13461.1k $6.1m $6.1m 0.02% Added +1.6k +1,635
72 California Public Employees Retirement System 0.00% of their portfolio Sacramento, CA 58,83058.8k $5.9m $5.9m 0.00% Reduced -704 -704
73 SG Americas Securities, LLC 0.02% of their portfolio NEW YORK, NY 57,56057.6k $5.8m $5.8m 0.02% Reduced -42.6k -42,567
74 Verition Fund Management LLC 0.03% of their portfolio GREENWICH, CT 51,51151.5k $5.2m $5.2m 0.03% Reduced -9.6k -9,641
75 Amundi 0.00% of their portfolio Paris, I0 50,77050.8k $4.8m $4.8m 0.00% Reduced -227.6k -227,559
76 Thomist Capital Management, LP 1.92% of their portfolio Houston, TX 46,10046.1k $4.6m $4.6m 1.92% New
77 CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.01% of their portfolio WEST SACRAMENTO, CA 45,19545.2k $4.5m $4.5m 0.01% Added +84 +84
78 Retirement Systems of Alabama 0.02% of their portfolio MONTGOMERY, AL 40,72940.7k $4.1m $4.1m 0.02% Added +40 +40
79 CANADA PENSION PLAN INVESTMENT BOARD 0.00% of their portfolio TORONTO ONTARIO, A6 39,36439.4k $3.9m $3.9m 0.00% Reduced -22.5k -22,477
80 ROYAL BANK OF CANADA 0.00% of their portfolio TORONTO, A6 38,68738.7k $3.9m $3.9m 0.00% Added +18.3k +18,321
81 Corebridge Financial, Inc. 0.02% of their portfolio HOUSTON, TX 36,96337.0k $3.7m $3.7m 0.02% Reduced -902 -902
82 Graham Capital Management, L.P. 0.12% of their portfolio ROWAYTON, CT 36,75436.8k $3.7m $3.7m 0.12% Added +18.9k +18,904
83 Walleye Capital LLC 0.04% of their portfolio NEW YORK, NY 34,37734.4k $3.4m $3.4m 0.04% Added +27.7k +27,672
84 DEUTSCHE BANK AG\ 0.00% of their portfolio FRANKFURT AM MAIN, 2M 33,23033.2k $3.3m $3.3m 0.00% Reduced -5.4k -5,353
85 Weiss Asset Management LP 0.08% of their portfolio BOSTON, MA 31,70231.7k $3.2m $3.2m 0.08% Not comparable
86 HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND 0.01% of their portfolio TORONTO, A6 30,90030.9k $3.1m $3.1m 0.01% Added +10.6k +10,600
87 COMERICA BANK 0.01% of their portfolio DALLAS, TX 30,63830.6k $3.1m $3.1m 0.01% Added +1.0k +1,038
88 LPL Financial LLC 0.00% of their portfolio FORT MILL, SC 30,42130.4k $3.0m $3.0m 0.00% Added +4.5k +4,493
89 Mitsubishi UFJ Asset Management Co., Ltd. 0.00% of their portfolio TOKYO, M0 29,69229.7k $3.0m $3.0m 0.00% Added +296 +296
90 ING GROEP NV 0.02% of their portfolio AMSTERDAM, P7 29,60029.6k $3.0m $3.0m 0.02% Added +7.3k +7,300
91 DANSKE BANK A/S 0.01% of their portfolio COPENHAGEN V, G7 28,71228.7k $2.9m $2.9m 0.01% Reduced -2.4k -2,400
92 CITIGROUP INC 0.00% of their portfolio NEW YORK, NY 28,25228.3k $2.8m $2.8m 0.00% Reduced -4.9k -4,885
93 STATE BOARD OF ADMINISTRATION OF FLORIDA RETIREMENT SYSTEM 0.01% of their portfolio TALLAHASSEE, FL 27,97528.0k $2.8m $2.8m 0.01% Unchanged
94 MANUFACTURERS LIFE INSURANCE COMPANY, THE 0.00% of their portfolio Toronto, A6 27,96928.0k $2.8m $2.8m 0.00% Added +4.9k +4,862
95 State of Alaska, Department of Revenue 0.03% of their portfolio JUNEAU, AK 27,85827.9k $2.8m $2.8m 0.03% Added +105 +105
96 Magnetar Financial LLC 0.04% of their portfolio EVANSTON, IL 27,27727.3k $2.7m $2.7m 0.04% New
97 NATIONAL BANK OF CANADA /FI/ 0.00% of their portfolio MONTREAL, A8 26,97427.0k $2.7m $2.7m 0.00% Reduced -2 -2
98 KBC Group NV 0.01% of their portfolio Brussels, C9 26,69526.7k $2.7m $2.7m 0.01% Reduced -560 -560
99 ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio Berwyn, PA 26,53526.5k $2.7m $2.7m 0.00% Added +8.3k +8,258
100 BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio PARIS, I0 26,35626.4k $2.6m $2.6m 0.00% First filing