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WLK in the 13F filings

Westlake Corporation · CUSIP 960413102

Sector · Materials
Quarter
Q2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023Q3 2023
Quarter end
31 Mar 2026
the date the book describes
Filed
18 May 2026
latest of these filings; the earliest 12 May 2026
Managers listing it
27
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q4 2025 and Q1 2026; 7 listed it in both
Shares listed
13,542,421
combined, among listed positions
Reported value
$1.6bn
combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 15 buyers (opened or added shares) and 18 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +151,595.

Managers listing WLK in Q1 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

27 of 27 holders

ActionFiling
Capital World Investors4,211,006$492m0.07%Added+2,039,68213 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc2,407,457$281munder 0.1%Added+198,74215 May 2026 (the filing on sec.gov)
Wellington Management Group LLP1,793,517$210munder 0.1%Trimmed-2,427,20015 May 2026 (the filing on sec.gov)
Fidelity (FMR LLC)1,312,473$153munder 0.1%Added+1,083,63015 May 2026 (the filing on sec.gov)
Holocene Advisors LP730,035$85m0.21%Trimmed-490,58715 May 2026 (the filing on sec.gov)
Citadel Advisors LLC715,586$84munder 0.1%Added+512,28315 May 2026 (the filing on sec.gov)
Balyasny Asset Management LLC369,672$43m0.06%Newnew15 May 2026 (the filing on sec.gov)
Woodline Partners LP337,075$39m0.15%Trimmed-291,08415 May 2026 (the filing on sec.gov)
Janus Henderson Group Ltd269,783$32munder 0.1%Trimmed-64,81018 May 2026 (the filing on sec.gov)
AQR Capital Management LLC260,070$30munder 0.1%Added+239,53515 May 2026 (the filing on sec.gov)
D. E. Shaw & Co.233,183$27munder 0.1%Trimmed-253,09815 May 2026 (the filing on sec.gov)
Invesco Ltd179,402$21munder 0.1%Trimmed-33,75512 May 2026 (the filing on sec.gov)
Man Group PLC160,286$19munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Jane Street Group LLC105,686$12munder 0.1%Newnew12 May 2026 (the filing on sec.gov)
Millennium Management LLC84,997$9.9munder 0.1%Trimmed-342,75715 May 2026 (the filing on sec.gov)
PDT Partners LLC75,777$8.9m0.52%Added+10,80015 May 2026 (the filing on sec.gov)
Rokos Capital Management LLP60,800$7.1m0.05%Newnew15 May 2026 (the filing on sec.gov)
Walleye Capital LLC59,814$7.0munder 0.1%Added+12,15713 May 2026 (the filing on sec.gov)
AllianceBernstein LP67,315$5.0munder 0.1%Trimmed-1,13315 May 2026 (the filing on sec.gov)
Squarepoint Ops LLC38,532$4.5munder 0.1%Newnew15 May 2026 (the filing on sec.gov)
Quantbot Technologies LP23,936$2.8m0.11%Trimmed-15,67113 May 2026 (the filing on sec.gov)
Susquehanna International Group LLP14,999$1.8munder 0.1%Trimmed-8,80215 May 2026 (the filing on sec.gov)
Schonfeld Strategic Advisors LLC10,182$1.2munder 0.1%Added+4,17015 May 2026 (the filing on sec.gov)
Winton Group Ltd8,229$961kunder 0.1%Newnew12 May 2026 (the filing on sec.gov)
First Eagle Investment Management LLC7,118$832kunder 0.1%Added+7,06514 May 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q4 2025 to Q1 2026, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (6)

Exited (6)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
8 in Q3 2024 to 7 in Q2 2026

Tracked managers listing it, at least.

0510152014201620182020202220242026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
WLK by quarter
QuarterHoldersReported valueBuyersSellers
Q2 20137$113mn.a.n.a.
Q3 20139$189mn.a.n.a.
Q4 201310$271mn.a.n.a.
Q1 201410$267mn.a.n.a.
Q2 20148$254mn.a.n.a.
Q3 201410$614mn.a.n.a.
Q4 20149$288mn.a.n.a.
Q1 201512$503mn.a.n.a.
Q2 201510$513mn.a.n.a.
Q3 20159$402mn.a.n.a.
Q4 20156$274mn.a.n.a.
Q1 20165$192mn.a.n.a.
Q2 20166$223mn.a.n.a.
Q3 201610$340mn.a.n.a.
Q4 201612$357mn.a.n.a.
Q1 20179$456mn.a.n.a.
Q2 20176$502mn.a.n.a.
Q3 201712$612mn.a.n.a.
Q4 20177$914mn.a.n.a.
Q1 201811$912mn.a.n.a.
Q2 20189$1.1bnn.a.n.a.
Q3 20189$937mn.a.n.a.
Q4 20188$763mn.a.n.a.
Q1 201910$881mn.a.n.a.
Q2 20198$839mn.a.n.a.
Q3 20198$911mn.a.n.a.
Q4 20197$682mn.a.n.a.
Q1 20207$305mn.a.n.a.
Q2 20208$611mn.a.n.a.
Q3 20205$794mn.a.n.a.
Q4 20208$996mn.a.n.a.
Q1 202110$794mn.a.n.a.
Q2 20217$325mn.a.n.a.
Q3 202112$344mn.a.n.a.
Q4 202111$315mn.a.n.a.
Q1 20228$416mn.a.n.a.
Q2 202210$373mn.a.n.a.
Q3 202211$401mn.a.n.a.
Q4 20228$681mn.a.n.a.
Q1 20238$935mn.a.n.a.
Q2 20237$709mn.a.n.a.
Q3 20238$858mn.a.n.a.
Q4 20239$963m44
Q1 20248$965m72
Q2 20247$832m43
Q3 20248$306m72
Q4 202410$430m81
Q1 202511$442m101
Q2 20257$252m53
Q3 20257$165m53
Q4 20259$654m1818
Q1 202610$1.2bn1518
Q2 20267$318m2014

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

WLK and LIN →WLK and GLW →WLK and HWM →Choose a stock to compare with WLK →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own WLK, latest filings →Back to the 13F Explorer →