WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC
Position in CWST — Casella Waste Systems Inc
CIK 1644956
CHICAGO, IL
Position in CWST
as of Jun 30, 2026
· filed Aug 12, 2026
Position Value
$26,020,929
-$73,716,750 QoQ
Shares Held
268,340
-78.7% QoQ
Ownership
0.422%
of shares outstanding
% of Portfolio
0.08%
of 13F equity value
Holder Rank
#63
of 415 holders
Holding Since
Mar 2020
26 quarters on record
Voting authority
Sole 76%
Shared 0%
None 24%
Common Shares in CWST Over Time
Shares Held
Position Value (USD)
Position in Waste Management
Industrials · as of Jun 30, 2026WILLIAM BLAIR INVESTMENT MANAGEMENT, LLC holds $151,259,916 across 2 Waste Management names. CWST ranks #2 (17.2% of the industry book) .
| # | Ticker | Company | Shares | Value (USD) | Open |
|---|---|---|---|---|---|
| 1 | CLH |
Clean Harbors Inc
|
419,210 | $125,238,987 | |
| 2 | CWST |
Casella Waste Systems Inc
This page
|
268,340 | $26,020,929 |
All Filings in CWST
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26 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-06-30 | $26,020,929 | 268,340 | Shares | Sole | 2026-08-12 | |
| 2026-03-31 | $99,737,679 | 1,257,092 | Shares | Sole | 2026-05-08 | |
| 2025-12-31 | $143,796,095 | 1,468,206 | Shares | Sole | 2026-02-09 | |
| 2025-09-30 | $171,720,180 | 1,809,867 | Shares | Sole | 2025-11-12 | |
| 2025-06-30 | $207,701,883 | 1,800,155 | Shares | Sole | 2025-07-29 | |
| 2025-03-31 | $247,135,710 | 2,216,265 | Shares | Sole | 2025-05-09 | |
| 2024-12-31 | $279,391,093 | 2,640,498 | Shares | Sole | 2025-02-10 | |
| 2024-09-30 | $263,858,622 | 2,652,112 | Shares | Sole | 2024-11-08 | |
| 2024-06-30 | $264,594,835 | 2,666,749 | Shares | Sole | 2024-08-08 | |
| 2024-03-31 | $263,960,159 | 2,669,770 | Shares | Sole | 2024-05-08 | |
| 2023-12-31 | $247,843,400 | 2,900,110 | Shares | Sole | 2024-02-09 | |
| 2023-09-30 | $232,506,319 | 3,047,265 | Shares | Sole | 2023-11-09 | |
| 2023-06-30 | $270,644,399 | 2,992,199 | Shares | Sole | 2023-08-11 | |
| 2023-03-31 | $242,845,408 | 2,937,883 | Shares | Sole | 2023-05-12 | |
| 2022-12-31 | $193,481,900 | 2,439,565 | Shares | Sole | 2023-02-09 | |
| 2022-09-30 | $190,487,249 | 2,493,615 | Shares | Sole | 2022-11-09 | |
| 2022-06-30 | $152,085,516 | 2,092,536 | Shares | Sole | 2022-08-10 | |
| 2022-03-31 | $181,787,590 | 2,074,017 | Shares | Sole | 2022-05-11 | |
| 2021-12-31 | $53,271,926 | 623,647 | Shares | Sole | 2022-02-14 | |
| 2021-09-30 | $59,721,342 | 786,428 | Shares | Sole | 2021-11-10 | |
| 2021-06-30 | $49,333,824 | 777,768 | Shares | Sole | 2021-08-12 | |
| 2021-03-31 | $50,589,450 | 795,807 | Shares | Sole | 2021-05-13 | |
| 2020-12-31 | $45,284,706 | 730,988 | Shares | Sole | 2021-02-09 | |
| 2020-09-30 | $35,191,085 | 630,100 | Shares | Sole | 2020-11-06 | |
| 2020-06-30 | $27,597,018 | 529,490 | Shares | Sole | 2020-08-12 | |
| 2020-03-31 | $23,719,106 | 607,248 | Shares | Sole | 2020-05-08 | |
| No filing history on record for this holder in this stock. | ||||||