Renaissance Technologies
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Renaissance Technologies’s Westlake Corp WLK Stock Holding History

Renaissance Technologies’s Portfolio WLK Stock Details WLK Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2025
Q4 		– Sell
-25,900
Closed -$2M – 3816
2025
Q3 		$2M Sell
25,900
-118,300
-82% -$9.86M ﹤0.01% 2070
2025
Q2 		$10.9M Sell
144,200
-135,900
-49% -$11.1M 0.01% 1013
2025
Q1 		$28M Sell
280,100
-70,600
-20% -$7.82M 0.04% 524
2024
Q4 		$40.2M Buy
350,700
+182,600
+109% +$23.8M 0.06% 392
2024
Q3 		$25.3M Buy
168,100
+109,000
+184% +$15.7M 0.04% 563
2024
Q2 		$8.56M Buy
+59,100
New +$9.08M 0.01% 1010
2024
Q1 		– Sell
-69,000
Closed -$9.66M – 4124
2023
Q4 		$9.66M Buy
69,000
+6,700
+11% +$851K 0.01% 967
2023
Q3 		$7.77M Buy
62,300
+46,700
+299% +$5.99M 0.01% 1068
2023
Q2 		$1.86M Buy
+15,600
New +$1.78M ﹤0.01% 2046
2022
Q4 		– Sell
-77,500
Closed -$6.73M – 4456
2022
Q3 		$6.73M Buy
77,500
+30,600
+65% +$2.93M 0.01% 1264
2022
Q2 		$4.6M Buy
46,900
+24,200
+107% +$2.96M 0.01% 1629
2022
Q1 		$2.8M Sell
22,700
-158,300
-87% -$17.3M ﹤0.01% 1979
2021
Q4 		$17.6M Buy
181,000
+70,000
+63% +$6.83M 0.02% 781
2021
Q3 		$10.1M Sell
111,000
-29,100
-21% -$2.49M 0.01% 1033
2021
Q2 		$12.6M Buy
+140,100
New +$13.6M 0.02% 1022
2020
Q1 		– Sell
-35,500
Closed -$2.49M – 3853
2019
Q4 		$2.49M Buy
+35,500
New +$2.38M ﹤0.01% 2211
2019
Q2 		– Sell
-339,200
Closed -$23M – 3785
2019
Q1 		$23M Sell
339,200
-368,100
-52% -$26.7M 0.02% 906
2018
Q4 		$46.8M Buy
707,300
+131,000
+23% +$9.47M 0.05% 453
2018
Q3 		$47.9M Buy
576,300
+171,000
+42% +$16.7M 0.05% 460
2018
Q2 		$43.6M Buy
405,300
+127,800
+46% +$14.3M 0.05% 500
2018
Q1 		$30.8M Buy
277,500
+233,300
+528% +$26M 0.03% 681
2017
Q4 		$4.71M Sell
44,200
-38,900
-47% -$3.6M 0.01% 1853
2017
Q3 		$6.91M Buy
+83,100
New +$6.1M 0.01% 1551
2016
Q2 		– Sell
-488,900
Closed -$22.6M – 3528
2016
Q1 		$22.6M Buy
488,900
+189,700
+63% +$8.61M 0.04% 579
2015
Q4 		$16.3M Sell
299,200
-259,800
-46% -$15.1M 0.04% 666
2015
Q3 		$29M Buy
559,000
+226,800
+68% +$13.2M 0.07% 351
2015
Q2 		$22.8M Sell
332,200
-205,300
-38% -$14.9M 0.05% 461
2015
Q1 		$38.7M Sell
537,500
-255,000
-32% -$16.3M 0.08% 300
2014
Q4 		$48.4M Buy
792,500
+25,200
+3% +$1.72M 0.12% 185
2014
Q3 		$66.4M Sell
767,300
-89,238
-10% -$8.08M 0.18% 91
2014
Q2 		$71.7M Buy
856,538
+35,338
+4% +$2.65M 0.17% 115
2014
Q1 		$54.3M Buy
821,200
+63,800
+8% +$4.05M 0.13% 154
2013
Q4 		$46.2M Buy
757,400
+72,000
+11% +$4.04M 0.11% 198
2013
Q3 		$35.9M Buy
685,400
+57,800
+9% +$2.95M 0.09% 265
2013
Q2 		$30.3M Buy
+627,600
New +$28.2M 0.08% 306

Other funds holding WLK

OAG
Orbis Allan Gray Hamilton, Bermuda $23.7B AUM 65.43% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
Vanguard Group
Vanguard Group Malvern, Pennsylvania $6.9T AUM 27.45% 1-Year Est. Return
BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
T. Rowe Price Associates
T. Rowe Price Associates Baltimore, Maryland $865B AUM 30.76% 1-Year Est. Return
Capital World Investors
Capital World Investors Los Angeles, California $733B AUM 35.63% 1-Year Est. Return
Dimensional Fund Advisors
Dimensional Fund Advisors Austin, Texas $481B AUM 30.42% 1-Year Est. Return
BIP
Brandes Investment Partners La Jolla, California $14.1B AUM 25.52% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Holocene Advisors
Holocene Advisors New York $41.5B AUM 42.97% 1-Year Est. Return

Renaissance Technologies's WLK Position: Q4 2025 in Review

Renaissance Technologies sold out of Westlake Corp (WLK) in Q4 2025, closing a stake of 25,900 shares — an estimated $2M sold.

Renaissance Technologies first reported a position in WLK in Q2 2013 and held it in 35 quarters. The position peaked at $71.7M in Q2 2014. 296 funds tracked by Wall St. Rank hold WLK as of Q4 2025.

  • Renaissance Technologies reported no remaining Westlake Corp position as of Q4 2025 after selling out during the quarter.
  • Renaissance Technologies sold 25,900 Westlake Corp shares in Q4 2025, an estimated $2M.
  • Renaissance Technologies first reported a position in Westlake Corp in Q2 2013 and held it in 35 quarters.
  • Renaissance Technologies's Westlake Corp position peaked at $71.7M in Q2 2014.
  • 296 funds tracked by Wall St. Rank held Westlake Corp as of Q4 2025.

Based on Renaissance Technologies's 13F filing for Q4 2025, filed 12 Feb 2026.