Clean Harbors, Inc.
MX ˙ BMV ˙ US1844961078
SecurityMX:CLH1 / Clean Harbors, Inc.
InstitutionEngineers Gate Manager LP
Latest Disclosed Ownership6,002 shares
Latest Disclosed Value $ 1,720,954
Engineers Gate Manager LP reports 51.34% increase in ownership of CLH1 / Clean Harbors, Inc.

On May 15, 2026 - Engineers Gate Manager LP filed a 13F-HR form disclosing ownership of 6,002 shares of Clean Harbors, Inc. (MX:CLH1) valued at $1,720,954 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 3,966 shares of Clean Harbors, Inc.. This represents a change in shares of 51.34% during the quarter.

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)
2026-05-15 2026-03-31 13F CLEAN HARBORS COM 184496107 6,002 2,036 51.34 1,721 85.15 0.0215
2026-02-17 2025-12-31 13F CLEAN HARBORS COM 184496107 3,966 -1,140 -22.33 930 -21.60 0.0110
2025-11-14 2025-09-30 13F CLEAN HARBORS COM 184496107 5,106 -4,487 -46.77 1,186 -46.55 0.0136
2025-08-14 2025-06-30 13F CLEAN HARBORS COM 184496107 9,593 -23,333 -70.86 2,218 -65.83 0.0276
2025-05-15 2025-03-31 13F CLEAN HARBORS COM 184496107 32,926 32,003 3,467.28 6,490 2,960.85 0.1094
2025-02-14 2024-12-31 13F CLEAN HARBORS COM 184496107 923 -6,497 -87.56 212 -88.18 0.0037
2024-11-14 2024-09-30 13F CLEAN HARBORS COM 184496107 7,420 5,345 257.59 1,793 282.30 0.0350
2024-08-14 2024-06-30 13F CLEAN HARBORS COM 184496107 2,075 257 14.14 469 28.49 0.0106
2024-05-15 2024-03-31 13F CLEAN HARBORS COM 184496107 1,818 -398 -17.96 366 -5.44 0.0096
2024-02-14 2023-12-31 13F CLEAN HARBORS COM 184496107 2,216 2,216 387 0.0110
2023-05-15 2023-03-31 13F CLEAN HARBORS COM 184496107 0 -4,657 -100.00 0 -100.00
2023-02-14 2022-12-31 13F CLEAN HARBORS COM 184496107 4,657 -13,703 -74.64 531 -73.70 0.0319
2022-11-14 2022-09-30 13F CLEAN HARBORS COM 184496107 18,360 8,802 92.09 2,019 140.93 0.1256
2022-08-15 2022-06-30 13F CLEAN HARBORS COM 184496107 9,558 9,558 838 0.0307
2022-05-16 2022-03-31 13F CLEAN HARBORS COM 184496107 0 -2,371 -100.00 0 -100.00
2022-02-14 2021-12-31 13F CLEAN HARBORS COM 184496107 2,371 -11,345 -82.71 237 -83.37 0.0107
2021-11-15 2021-09-30 13F CLEAN HARBORS COM 184496107 13,716 -925 -6.32 1,425 4.47 0.0812
2021-08-16 2021-06-30 13F CLEAN HARBORS COM 184496107 14,641 11,491 364.79 1,364 414.72 0.0877
2021-05-17 2021-03-31 13F CLEAN HARBORS COM 184496107 3,150 -740 -19.02 265 -10.47 0.0131
2021-02-16 2020-12-31 13F CLEAN HARBORS COM 184496107 3,890 -19,356 -83.27 296 -77.27 0.0128
2020-11-16 2020-09-30 13F CLEAN HARBORS COM 184496107 23,246 23,246 1,302 0.0611
2020-08-17 2020-06-30 13F CLEAN HARBORS COM 184496107 0 -4,814 -100.00 0 -100.00
2020-05-15 2020-03-31 13F CLEAN HARBORS COM 184496107 4,814 1,850 62.42 247 -2.76 0.0178
2020-02-14 2019-12-31 13F CLEAN HARBORS COM 184496107 2,964 2,964 254 0.0112
2019-08-14 2019-06-30 13F CLEAN HARBORS COM 184496107 0 -62,542 -100.00 0 -100.00
2019-05-15 2019-03-31 13F CLEAN HARBORS COM 184496107 62,542 10,642 20.50 4,474 74.70 0.2709
2019-02-14 2018-12-31 13F CLEAN HARBORS COM 184496107 51,900 51,900 2,561 0.2049
2018-11-01 2018-09-30 13F CLEAN HARBORS COM 184496107 0 -41,357 -100.00 0 -100.00
2018-08-03 2018-06-30 13F CLEAN HARBORS COM 184496107 41,357 33,671 438.08 2,297 512.53 0.1790
2018-05-07 2018-03-31 13F CLEAN HARBORS COM 184496107 7,686 7,686 375 0.0250
2016-05-09 2016-03-31 13F CLEAN HARBORS COM 184496107 0 -37,126 -100.00 0 -100.00
2016-02-05 2015-12-31 13F CLEAN HARBORS COM 184496107 37,126 31,808 598.12 1,546 560.68 0.1044
2015-11-16 2015-09-30 13F CLEAN HARBORS COM 184496107 5,318 -2,553 -32.44 234 -44.68 0.0199
2015-08-14 2015-06-30 13F CLEAN HARBORS COM 184496107 7,871 7,871 0.00 423 0.0414
2015-05-15 2015-03-31 13F CLEAN HARBORS COM 184496107 0 -4,870 -100.00 0 -100.00
2015-02-17 2014-12-31 13F CLEAN HARBORS COM 184496107 4,870 4,870 234 0.0666
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.