Casella Waste Systems, Inc.
DE ˙ DB ˙ US1474481041
71,30 € ↓ -0,02 (-0,03%)
2026-06-04
DEL PRIS
SecurityDE:WA3 / Casella Waste Systems, Inc.
InstitutionSei Investments Co
Latest Disclosed Ownership558,165 shares
Latest Disclosed Value $ 54,666,934
Sei Investments Co reports 8.20% increase in ownership of WA3 / Casella Waste Systems, Inc.

On February 13, 2026 - Sei Investments Co filed a 13F-HR form disclosing ownership of 558,165 shares of Casella Waste Systems, Inc. (DE:WA3) valued at $47,924,047 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 13, 2025 disclosing 515,845 shares of Casella Waste Systems, Inc.. This represents a change in shares of 8.20% during the quarter. The current value of the position is $39,797,164 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-02-13 2025-12-31 13F CASELLA WASTE SYS CL A 147448104 558,165 42,320 8.20 54,667 11.70 0.0540
2025-11-13 2025-09-30 13F CASELLA WASTE SYS CL A 147448104 515,845 -24,907 -4.61 48,941 -21.56 0.0526
2025-08-14 2025-06-30 13F CASELLA WASTE SYS CL A 147448104 540,752 52,809 10.82 62,392 14.67 0.0723
2025-05-14 2025-03-31 13F/A-1 CASELLA WASTE SYS CL A 147448104 487,943 37,959 8.44 54,411 14.28 0.0700
2025-05-13 2025-03-31 13F CASELLA WASTE SYS CL A 147448104 455,259 5,275 48,375 0.0526
2025-02-11 2024-12-31 13F CASELLA WASTE SYS CL A 147448104 449,984 43,657 10.74 47,613 17.78 0.0611
2024-11-12 2024-09-30 13F CASELLA WASTE SYS CL A 147448104 406,327 -19,478 -4.57 40,426 -4.31 0.0525
2024-08-13 2024-06-30 13F CASELLA WASTE SYS CL A 147448104 425,805 65,580 18.21 42,249 18.62 0.0599
2024-05-07 2024-03-31 13F CASELLA WASTE SYS CL A 147448104 360,225 35,089 10.79 35,616 28.18 0.0522
2024-02-14 2023-12-31 13F CASELLA WASTE SYS CL A 147448104 325,136 -79,940 -19.73 27,786 -10.10 0.0446
2023-11-14 2023-09-30 13F CASELLA WASTE SYS CL A 147448104 405,076 34,487 9.31 30,907 -7.79 0.0555
2023-08-11 2023-06-30 13F CASELLA WASTE SYS CL A 147448104 370,589 -3,858 -1.03 33,520 8.30 0.0585
2023-05-12 2023-03-31 13F CASELLA WASTE SYS CL A 147448104 374,447 316,850 550.12 30,952 577.56 0.0575
2023-02-10 2022-12-31 13F CASELLA WASTE SYS CL A 147448104 57,597 -352,237 -85.95 4,568 -85.41 0.0102
2022-11-14 2022-09-30 13F CASELLA WASTE SYS CL A 147448104 409,834 -22,182 -5.13 31,307 -0.29 0.0698
2022-08-15 2022-06-30 13F CASELLA WASTE SYS CL A 147448104 432,016 366,675 561.17 31,399 448.26 0.0678
2022-05-13 2022-03-31 13F CASELLA WASTE SYS CL A 147448104 65,341 -2,523 -3.72 5,727 -1.21 0.0115
2022-02-14 2021-12-31 13F CASELLA WASTE SYS CL A 147448104 67,864 -294 -0.43 5,797 12.00 0.0109
2021-11-12 2021-09-30 13F CASELLA WASTE SYS CL A 147448104 68,158 -26,400 -27.92 5,176 -13.70 0.0109
2021-08-06 2021-06-30 13F CASELLA WASTE SYS CL A 147448104 94,558 22,536 31.29 5,998 31.02 0.0133
2021-05-12 2021-03-31 13F CASELLA WASTE SYS CL A 147448104 72,022 -17,916 -19.92 4,578 -17.84 0.0115
2021-02-08 2020-12-31 13F CASELLA WASTE SYS CL A 147448104 89,938 4,225 4.93 5,572 16.40 0.0144
2020-12-04 2020-09-30 13F/A-1 CASELLA WASTE SYS CL A 147448104 85,713 -7,894 -8.43 4,787 -1.89 0.0139
2020-11-06 2020-09-30 13F CASELLA WASTE SYS CL A 147448104 85,713 -7,894 4,787 11,526.0317
2020-08-17 2020-06-30 13F/A-1 CASELLA WASTE SYS CL A 147448104 93,607 -11,144 -10.64 4,879 19.23 0.0151
2020-08-11 2020-06-30 13F CASELLA WASTE SYS CL A 147448104 100,768 -3,983 4,638 12,580.8219
2020-05-14 2020-03-31 13F CASELLA WASTE SYS CL A 147448104 104,751 -7,866 -6.98 4,092 -21.05 0.0150
2020-02-06 2019-12-31 13F CASELLA WASTE SYS CL A 147448104 112,617 15,238 15.65 5,183 23.94 0.0155
2019-11-12 2019-09-30 13F CASELLA WASTE SYS CL A 147448104 97,379 -39,516 -28.87 4,182 -22.93 0.0107
2019-08-14 2019-06-30 13F CASELLA WASTE SYS CL A 147448104 136,895 -4,338 -3.07 5,426 8.02 0.0177
2019-05-15 2019-03-31 13F CASELLA WASTE SYS CL A 147448104 141,233 -36,121 -20.37 5,023 -7.82 0.0169
2019-02-13 2018-12-31 13F CASELLA WASTE SYS CL A 147448104 177,354 23,068 14.95 5,449 13.71 0.0194
2018-11-08 2018-09-30 13F CASELLA WASTE SYS CL A 147448104 154,286 -4,807 -3.02 4,792 17.60 0.0174
2018-08-03 2018-06-30 13F CASELLA WASTE SYS CL A 147448104 159,093 -33,174 -17.25 4,075 -9.34 0.0139
2018-05-11 2018-03-31 13F CASELLA WASTE SYS CL A 147448104 192,267 120,108 166.45 4,495 170.62 0.0172
2018-02-08 2017-12-31 13F CASELLA WASTE SYS CL A 147448104 72,159 15,719 27.85 1,661 56.55 0.0058
2017-11-06 2017-09-30 13F CASELLA WASTE SYS CL A 147448104 56,440 -73,742 -56.65 1,061 -50.35 0.0038
2017-07-31 2017-06-30 13F CASELLA WASTE SYS CL A 147448104 130,182 75,293 137.17 2,137 176.10 0.0085
2017-05-05 2017-03-31 13F CASELLA WASTE SYS CL A 147448104 54,889 47,949 690.91 774 800.00 0.0034
2017-02-02 2016-12-31 13F CASELLA WASTE SYS CL A 147448104 6,940 6,940 0.00 86 0.0004
2016-11-04 2016-09-30 13F CASELLA WASTE SYS CL A 147448104 0 -63,000 -100.00 0 -100.00
2016-08-11 2016-06-30 13F CASELLA WASTE SYS CL A 147448104 63,000 -1,000 -1.56 495 15.38 0.0030
2016-05-10 2016-03-31 13F/A-1 CASELLA WASTE SYS CL A 147448104 64,000 30,000 88.24 429 111.33 0.0027
2016-02-03 2015-12-31 13F CASELLA WASTE SYS CL A 147448104 34,000 -27,891 -45.06 203 -43.45 0.0012
2015-11-02 2015-09-30 13F/A-1 CASELLA WASTE SYS INC CL CL A 147448104 61,891 61,891 359 0.0033
2015-10-30 2015-09-30 13F CASELLA WASTE SYS INC CL CL A 147448104 61,891 359
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.