William Blair Investment Management
TREX icon

William Blair Investment Management’s Trex TREX Stock Holding History

William Blair Investment Management’s Portfolio TREX Stock Details TREX Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$25.6M Sell
511,527
-135,651
-21% -$5.63M 0.08% 212
2026
Q1 		$23.6M Buy
+647,178
New +$26M 0.08% 239
2024
Q3 		– Sell
-1,937,694
Closed -$144M – 450
2024
Q2 		$144M Sell
1,937,694
-19,473
-1% -$1.7M 0.38% 84
2024
Q1 		$195M Sell
1,957,167
-56,188
-3% -$5M 0.5% 59
2023
Q4 		$167M Sell
2,013,355
-105,443
-5% -$6.99M 0.49% 66
2023
Q3 		$131M Sell
2,118,798
-486,399
-19% -$33.4M 0.43% 77
2023
Q2 		$171M Sell
2,605,197
-5,786
-0.2% -$323K 0.55% 64
2023
Q1 		$127M Sell
2,610,983
-253,218
-9% -$12.8M 0.44% 79
2022
Q4 		$121M Sell
2,864,201
-136,425
-5% -$6.19M 0.46% 75
2022
Q3 		$132M Sell
3,000,626
-13,647
-0.5% -$730K 0.52% 67
2022
Q2 		$164M Sell
3,014,273
-98,621
-3% -$5.95M 0.61% 52
2022
Q1 		$203M Buy
3,112,894
+29,093
+0.9% +$2.59M 0.61% 52
2021
Q4 		$416M Sell
3,083,801
-69,667
-2% -$8.36M 1.13% 9
2021
Q3 		$321M Buy
3,153,468
+19,332
+0.6% +$2.02M 0.91% 22
2021
Q2 		$320M Sell
3,134,136
-43,608
-1% -$4.4M 1.01% 22
2021
Q1 		$291M Buy
3,177,744
+8,315
+0.3% +$782K 0.94% 21
2020
Q4 		$265M Sell
3,169,429
-669,298
-17% -$51.2M 0.88% 27
2020
Q3 		$275M Sell
3,838,727
-213,023
-5% -$14.7M 1.07% 18
2020
Q2 		$264M Sell
4,051,750
-2,131,934
-34% -$114M 1.07% 18
2020
Q1 		$248M Sell
6,183,684
-1,384,618
-18% -$64.9M 1.21% 10
2019
Q4 		$340M Buy
7,568,302
+240,256
+3% +$10.6M 1.36% 7
2019
Q3 		$333M Sell
7,328,046
-38,336
-0.5% -$1.55M 1.42% 6
2019
Q2 		$264M Buy
7,366,382
+1,637,470
+29% +$55.5M 1.11% 12
2019
Q1 		$176M Buy
5,728,912
+2,341,090
+69% +$81.8M 0.74% 41
2018
Q4 		$101M Buy
+3,387,822
New +$106M 0.5% 64

Other funds holding TREX

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $580B AUM 38.23% 1-Year Est. Return
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
AllianceBernstein
AllianceBernstein Nashville, Tennessee $302B AUM 26.44% 1-Year Est. Return
Millennium Management
Millennium Management New York $276B AUM 44.8% 1-Year Est. Return
WA
Wasatch Advisors Salt Lake City, Utah $15.3B AUM 25.06% 1-Year Est. Return
AQR Capital Management
AQR Capital Management Greenwich, Connecticut $287B AUM 42.33% 1-Year Est. Return
American Century Companies
American Century Companies Kansas City, Missouri $226B AUM 44.75% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return

William Blair Investment Management's TREX Position: Q2 2026 in Review

William Blair Investment Management reduced its Trex (TREX) stake by 21% in Q2 2026, selling an estimated $5.63M and leaving 511,527 shares worth $25.6M. The position accounts for 0.08% of the portfolio, ranked #212.

William Blair Investment Management first reported a position in TREX in Q4 2018 and has held it in 25 quarters since. The position peaked at $416M in Q4 2021. 470 funds tracked by Wall St. Rank hold TREX as of Q2 2026.

  • William Blair Investment Management held 511,527 shares of Trex worth $25.6M as of Q2 2026.
  • William Blair Investment Management sold 135,651 Trex shares in Q2 2026, an estimated $5.63M.
  • Trex made up 0.08% of William Blair Investment Management's portfolio in Q2 2026, its #212 holding.
  • William Blair Investment Management first reported a position in Trex in Q4 2018 and has held it in 25 quarters since.
  • William Blair Investment Management's Trex position peaked at $416M in Q4 2021.
  • 470 funds tracked by Wall St. Rank held Trex as of Q2 2026.

Based on William Blair Investment Management's 13F filing for Q2 2026, filed 12 Aug 2026.