Clean Harbors, Inc.
MX ˙ BMV ˙ US1844961078
SecurityMX:CLH1 / Clean Harbors, Inc.
InstitutionCwm, Llc
Latest Disclosed Ownership3,233 shares
Latest Disclosed Value $ 926,998
Cwm, Llc reports 248.01% increase in ownership of CLH1 / Clean Harbors, Inc.

On May 14, 2026 - Cwm, Llc filed a 13F-HR form disclosing ownership of 3,233 shares of Clean Harbors, Inc. (MX:CLH1) valued at $926,998 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 929 shares of Clean Harbors, Inc..

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)
2026-05-14 2026-03-31 13F CLEAN HARBORS COM 184496107 3,233 2,304 248.01 927 0.0024
2026-01-26 2025-12-31 13F CLEAN HARBORS COM 184496107 929 -379 -28.98 0 0.0006
2025-10-15 2025-09-30 13F CLEAN HARBORS COM 184496107 1,308 290 28.49 0 0.0009
2025-07-25 2025-06-30 13F CLEAN HARBORS COM 184496107 1,018 -35 -3.32 0 0.0008
2025-05-01 2025-03-31 13F CLEAN HARBORS COM 184496107 1,053 -1,209 -53.45 0 0.0008
2025-02-04 2024-12-31 13F CLEAN HARBORS COM 184496107 2,262 -118 -4.96 1 0.0022
2024-10-08 2024-09-30 13F CLEAN HARBORS COM 184496107 2,380 1,029 76.17 1 0.0025
2024-07-10 2024-06-30 13F CLEAN HARBORS COM 184496107 1,351 121 9.84 0 0.0014
2024-04-05 2024-03-31 13F CLEAN HARBORS COM 184496107 1,230 -36 -2.84 0 0.0012
2024-02-01 2023-12-31 13F CLEAN HARBORS COM 184496107 1,266 423 50.18 0 0.0012
2023-10-11 2023-09-30 13F CLEAN HARBORS COM 184496107 843 99 13.31 0 0.0009
2023-08-03 2023-06-30 13F CLEAN HARBORS COM 184496107 744 -4 -0.53 0 0.0008
2023-05-01 2023-03-31 13F CLEAN HARBORS COM 184496107 748 -40 -5.08 0 0.0007
2023-02-01 2022-12-31 13F CLEAN HARBORS COM 184496107 788 -86 -9.84 0 -100.00 0.0007
2022-10-27 2022-09-30 13F CLEAN HARBORS COM 184496107 874 -175 -16.68 96 4.35 0.0008
2022-07-28 2022-06-30 13F CLEAN HARBORS COM 184496107 1,049 -890 -45.90 92 -57.41 0.0007
2022-04-21 2022-03-31 13F CLEAN HARBORS COM 184496107 1,939 -2,999 -60.73 216 -56.19 0.0015
2022-01-31 2021-12-31 13F CLEAN HARBORS COM 184496107 4,938 4,757 2,628.18 493 2,800.00 0.0035
2021-09-15 2021-06-30 13F/A-1 CLEAN HARBORS COM 184496107 181 0 0.00 17 0.00 0.0001
2021-07-29 2021-06-30 13F CLEAN HARBORS COM 184496107 181 0 17 0.0001
2021-09-15 2021-03-31 13F/A-1 CLEAN HARBORS COM 184496107 181 0 0.00 17 0.00 0.0001
2021-04-27 2021-03-31 13F CLEAN HARBORS COM 184496107 75 -106 6 0.0001
2021-09-15 2020-12-31 13F/A-1 CLEAN HARBORS COM 184496107 181 0 0.00 17 0.00 0.0001
2021-01-27 2020-12-31 13F CLEAN HARBORS COM 184496107 75 -106 6 0.0001
2021-09-15 2020-09-30 13F/A-1 CLEAN HARBORS COM 184496107 181 0 0.00 17 0.00 0.0001
2020-10-19 2020-09-30 13F CLEAN HARBORS COM 184496107 91 -90 5 0.0001
2021-09-15 2020-06-30 13F/A-1 CLEAN HARBORS COM 184496107 181 0 0.00 17 0.00 0.0001
2020-07-22 2020-06-30 13F CLEAN HARBORS COM 184496107 126 -55 8 0.0001
2021-09-15 2020-03-31 13F/A-1 CLEAN HARBORS COM 184496107 181 0 0.00 17 0.00 0.0001
2020-04-28 2020-03-31 13F CLEAN HARBORS COM 184496107 165 -16 8 0.0001
2021-09-14 2019-12-31 13F/A-1 CLEAN HARBORS COM 184496107 181 0 0.00 17 0.00 0.0001
2020-01-27 2019-12-31 13F CLEAN HARBORS COM 184496107 85 -96 7 0.0001
2021-09-14 2019-09-30 13F/A-1 CLEAN HARBORS COM 184496107 181 0 0.00 17 0.00 0.0001
2019-10-22 2019-09-30 13F CLEAN HARBORS COM 184496107 5 -176 0
2021-09-14 2019-06-30 13F/A-1 CLEAN HARBORS COM 184496107 181 0 0.00 17 0.00 0.0001
2019-07-31 2019-06-30 13F CLEAN HARBORS COM 184496107 5 -176 0
2021-09-02 2019-03-31 13F/A-1 CLEAN HARBORS COM 184496107 181 -229 -55.85 17 -15.00 0.0001
2019-04-22 2019-03-31 13F CLEAN HARBORS COM 184496107 146 -264 10 0.0002
2019-01-25 2018-12-31 13F CLEAN HARBORS COM 184496107 410 -49,772 -99.18 20 -99.44 0.0005
2018-10-29 2018-09-30 13F CLEAN HARBORS COM 184496107 50,182 20,619 69.75 3,592 118.76 0.0917
2018-07-31 2018-06-30 13F CLEAN HARBORS COM 184496107 29,563 -403 -1.34 1,642 12.24 0.0540
2018-04-26 2018-03-31 13F CLEAN HARBORS COM 184496107 29,966 -3,001 -9.10 1,463 -18.13 0.0581
2018-01-16 2017-12-31 13F CLEAN HARBORS COM 184496107 32,967 -5,325 -13.91 1,787 -17.69 0.0794
2017-10-16 2017-09-30 13F CLEAN HARBORS COM 184496107 38,292 -5,249 -12.06 2,171 -10.70 0.1026
2017-07-17 2017-06-30 13F CLEAN HARBORS COM 184496107 43,541 -6,613 -13.19 2,431 -12.87 0.1246
2017-04-17 2017-03-31 13F CLEAN HARBORS COM 184496107 50,154 -3,683 -6.84 2,790 -6.88 0.1578
2017-01-19 2016-12-31 13F CLEAN HARBORS COM 184496107 53,837 -3,953 -6.84 2,996 8.04 0.1836
2016-10-17 2016-09-30 13F CLEAN HARBORS COM 184496107 57,790 -5,750 -9.05 2,773 -16.25 0.1914
2016-07-21 2016-06-30 13F CLEAN HARBORS COM 184496107 63,540 -4,163 -6.15 3,311 -0.87 0.2415
2016-04-18 2016-03-31 13F CLEAN HARBORS COM 184496107 67,703 -3,784 -5.29 3,340 12.19 0.2933
2016-02-01 2015-12-31 13F CLEAN HARBORS COM 184496107 71,487 14,135 24.65 2,977 18.04 0.2909
2015-10-30 2015-09-30 13F CLEAN HARBORS COM 184496107 57,352 2,460 4.48 2,522 -14.51 0.2539
2015-07-09 2015-06-30 13F CLEAN HARBORS COM 184496107 54,892 4,684 9.33 2,950 3.47 0.2830
2015-04-30 2015-03-31 13F CLEAN HARBORS COM 184496107 50,208 4,041 8.75 2,851 28.54 0.2887
2015-02-12 2014-12-31 13F CLEAN HARBORS COM 184496107 46,167 10,486 29.39 2,218 15.28 0.2692
2014-11-14 2014-09-30 13F CLEAN HARBORS COM 184496107 35,681 3,850 12.10 1,924 -5.92 0.2794
2014-08-14 2014-06-30 13F CLEAN HARBORS COM 184496107 31,831 9,150 40.34 2,045 64.52 0.3659
2014-05-16 2014-03-31 13F CLEAN HARBORS COM 184496107 22,681 6,370 39.05 1,243 27.10 0.1694
2014-02-14 2013-12-31 13F CLEAN HARBORS COM 184496107 16,311 16,311 978 0.1526
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.