William Blair Investment Management
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William Blair Investment Management’s Casella Waste Systems CWST Stock Holding History

William Blair Investment Management’s Portfolio CWST Stock Details CWST Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q2 		$26M Sell
268,340
-988,752
-79% -$84.5M 0.08% 208
2026
Q1 		$99.7M Sell
1,257,092
-211,114
-14% -$20.2M 0.33% 88
2025
Q4 		$144M Sell
1,468,206
-341,661
-19% -$31.7M 0.4% 63
2025
Q3 		$172M Buy
1,809,867
+9,712
+0.5% +$978K 0.44% 59
2025
Q2 		$208M Sell
1,800,155
-416,110
-19% -$48.1M 0.55% 44
2025
Q1 		$247M Sell
2,216,265
-424,233
-16% -$46.4M 0.69% 32
2024
Q4 		$279M Sell
2,640,498
-11,614
-0.4% -$1.23M 0.68% 24
2024
Q3 		$264M Sell
2,652,112
-14,637
-0.5% -$1.52M 0.65% 37
2024
Q2 		$265M Sell
2,666,749
-3,021
-0.1% -$291K 0.69% 29
2024
Q1 		$264M Sell
2,669,770
-230,340
-8% -$20.6M 0.68% 31
2023
Q4 		$248M Sell
2,900,110
-147,155
-5% -$11.8M 0.72% 34
2023
Q3 		$233M Buy
3,047,265
+55,066
+2% +$4.51M 0.77% 28
2023
Q2 		$271M Buy
2,992,199
+54,316
+2% +$4.85M 0.87% 19
2023
Q1 		$243M Buy
2,937,883
+498,318
+20% +$39.4M 0.85% 25
2022
Q4 		$193M Sell
2,439,565
-54,050
-2% -$4.34M 0.74% 37
2022
Q3 		$190M Buy
2,493,615
+401,079
+19% +$32.2M 0.75% 39
2022
Q2 		$152M Buy
2,092,536
+18,519
+0.9% +$1.41M 0.56% 61
2022
Q1 		$182M Buy
2,074,017
+1,450,370
+233% +$116M 0.54% 65
2021
Q4 		$53.3M Sell
623,647
-162,781
-21% -$13.6M 0.14% 152
2021
Q3 		$59.7M Buy
786,428
+8,660
+1% +$610K 0.17% 139
2021
Q2 		$49.3M Sell
777,768
-18,039
-2% -$1.2M 0.15% 146
2021
Q1 		$50.6M Buy
795,807
+64,819
+9% +$3.92M 0.16% 144
2020
Q4 		$45.3M Buy
730,988
+100,888
+16% +$5.99M 0.15% 139
2020
Q3 		$35.2M Buy
630,100
+100,610
+19% +$5.51M 0.14% 146
2020
Q2 		$27.6M Sell
529,490
-77,758
-13% -$3.71M 0.11% 156
2020
Q1 		$23.7M Buy
607,248
+67,038
+12% +$3.25M 0.12% 164
2019
Q4 		$24.9M Buy
540,210
+126,594
+31% +$5.58M 0.1% 176
2019
Q3 		$17.8M Sell
413,616
-170,845
-29% -$7.4M 0.08% 219
2019
Q2 		$23.2M Buy
584,461
+3,117
+0.5% +$117K 0.1% 176
2019
Q1 		$20.7M Buy
581,344
+28,882
+5% +$943K 0.09% 202
2018
Q4 		$15.7M Buy
552,462
+19,899
+4% +$604K 0.08% 238
2018
Q3 		$16.5M Buy
+532,563
New +$15.1M 0.06% 281

Other funds holding CWST

BlackRock
BlackRock New York $6.73T AUM 46.02% 1-Year Est. Return
WA
Wasatch Advisors Salt Lake City, Utah $15.3B AUM 25.06% 1-Year Est. Return
Vanguard Portfolio Management
Vanguard Portfolio Management Malvern, Pennsylvania $2.22T AUM
Vanguard Capital Management
Vanguard Capital Management Malvern, Pennsylvania $4.68T AUM
State Street
State Street Boston, Massachusetts $3.37T AUM 44.26% 1-Year Est. Return
CCA
Conestoga Capital Advisors Wayne, Pennsylvania $4.6B AUM 16.08% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $153B AUM 38.14% 1-Year Est. Return
Capital International Investors
Capital International Investors Los Angeles, California $484B AUM 34.9% 1-Year Est. Return
Capital Research Global Investors
Capital Research Global Investors Los Angeles, California $717B AUM 35.42% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.88T AUM 44.46% 1-Year Est. Return

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

William Blair Investment Management reduced its Casella Waste Systems (CWST) stake by 79% in Q2 2026, selling an estimated $84.5M and leaving 268,340 shares worth $26M. The position accounts for 0.08% of the portfolio, ranked #208.

William Blair Investment Management first reported a position in CWST in Q3 2018 and has held it in 32 quarters since. The position peaked at $279M in Q4 2024. 417 funds tracked by Wall St. Rank hold CWST as of Q2 2026.

  • William Blair Investment Management held 268,340 shares of Casella Waste Systems worth $26M as of Q2 2026.
  • William Blair Investment Management sold 988,752 Casella Waste Systems shares in Q2 2026, an estimated $84.5M.
  • Casella Waste Systems made up 0.08% of William Blair Investment Management's portfolio in Q2 2026, its #208 holding.
  • William Blair Investment Management first reported a position in Casella Waste Systems in Q3 2018 and has held it in 32 quarters since.
  • William Blair Investment Management's Casella Waste Systems position peaked at $279M in Q4 2024.
  • 417 funds tracked by Wall St. Rank held Casella Waste Systems as of Q2 2026.

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