Clean Harbors, Inc.
MX ˙ BMV ˙ US1844961078
SecurityMX:CLH1 / Clean Harbors, Inc.
InstitutionM&t Bank Corp
Latest Disclosed Ownership7,168 shares
Latest Disclosed Value $ 2,055,280
M&t Bank Corp reports 50.95% decrease in ownership of CLH1 / Clean Harbors, Inc.

On May 12, 2026 - M&t Bank Corp filed a 13F-HR form disclosing ownership of 7,168 shares of Clean Harbors, Inc. (MX:CLH1) valued at $2,055,280 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on January 30, 2026 disclosing 14,614 shares of Clean Harbors, Inc.. This represents a change in shares of -50.95% 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)
2026-05-12 2026-03-31 13F CLEAN HARBORS COM 184496107 7,168 -7,446 -50.95 2,055 -40.02 0.0017
2026-01-30 2025-12-31 13F/A-1 CLEAN HARBORS COM 184496107 14,614 3,463 31.06 3,427 32.33 0.0110
2026-01-28 2025-12-31 13F CLEAN HARBORS COM 184496107 2,696 -8,455 545 0.0003
2025-11-14 2025-09-30 13F CLEAN HARBORS COM 184496107 11,151 -4,826 -30.21 2,589 -29.89 0.0087
2025-08-13 2025-06-30 13F CLEAN HARBORS COM 184496107 15,977 671 4.38 3,694 22.41 0.0127
2025-04-30 2025-03-31 13F CLEAN HARBORS COM 184496107 15,306 -19,926 -56.56 3,017 -62.79 0.0110
2025-02-06 2024-12-31 13F CLEAN HARBORS COM 184496107 35,232 305 0.87 8,108 -3.96 0.0272
2024-11-19 2024-09-30 13F/A-1 CLEAN HARBORS COM 184496107 34,927 -2,116 -5.71 8,442 0.78 0.0278
2024-11-15 2024-09-30 13F CLEAN HARBORS COM 184496107 34,927 -2,116 8,442 0.0051
2024-07-31 2024-06-30 13F CLEAN HARBORS COM 184496107 37,043 -2,588 -6.53 8,377 5.01 0.0286
2024-05-07 2024-03-31 13F CLEAN HARBORS COM 184496107 39,631 -382 -0.95 7,978 14.25 0.0278
2024-02-06 2023-12-31 13F CLEAN HARBORS COM 184496107 40,013 -420 -1.04 6,982 3.19 0.0256
2023-11-02 2023-09-30 13F CLEAN HARBORS COM 184496107 40,433 -4,886 -10.78 6,767 -9.19 0.0270
2023-08-09 2023-06-30 13F CLEAN HARBORS COM 184496107 45,319 -3,568 -7.30 7,452 6.92 0.0278
2023-05-11 2023-03-31 13F CLEAN HARBORS COM 184496107 48,887 -2,079 -4.08 6,969 19.82 0.0270
2023-02-13 2022-12-31 13F/A-1 CLEAN HARBORS COM 184496107 50,966 -7,123 -12.26 5,817 -8.98 0.0234
2023-02-13 2022-12-31 13F CLARUS CORP COM 184496107 78,914 20,825 6,031 0.0243
2022-11-17 2022-09-30 13F/A-1 CLEAN HARBORS COM 184496107 58,089 -6,687 -10.32 6,390 13.62 0.0284
2022-11-14 2022-09-30 13F CLEAN HARBORS COM 184496107 58,089 -6,687 6,335 0.0054
2022-08-05 2022-06-30 13F CLEAN HARBORS COM 184496107 64,776 1,567 2.48 5,624 -20.29 0.0265
2022-05-09 2022-03-31 13F CLEAN HARBORS COM 184496107 63,209 26,608 72.70 7,056 93.32 0.0312
2022-02-07 2021-12-31 13F CLEAN HARBORS COM 184496107 36,601 -1,415 -3.72 3,650 -7.57 0.0153
2021-10-28 2021-09-30 13F CLEAN HARBORS COM 184496107 38,016 -553 -1.43 3,949 9.97 0.0178
2021-08-13 2021-06-30 13F CLEAN HARBORS COM 184496107 38,569 -1,715 -4.26 3,591 6.02 0.0158
2021-05-06 2021-03-31 13F CLEAN HARBORS COM 184496107 40,284 1,446 3.72 3,387 14.62 0.0146
2021-02-12 2020-12-31 13F CLEAN HARBORS COM 184496107 38,838 1,421 3.80 2,955 40.92 0.0130
2020-11-06 2020-09-30 13F CLEAN HARBORS COM 184496107 37,417 5,224 16.23 2,097 8.60 0.0103
2020-07-29 2020-06-30 13F CLEAN HARBORS COM 184496107 32,193 -1,991 -5.82 1,931 9.97 0.0103
2020-05-14 2020-03-31 13F CLEAN HARBORS COM 184496107 34,184 2,032 6.32 1,756 -36.33 0.0104
2020-02-07 2019-12-31 13F CLEAN HARBORS COM 184496107 32,152 -3,847 -10.69 2,758 -0.76 0.0130
2019-11-12 2019-09-30 13F CLEAN HARBORS COM 184496107 35,999 580 1.64 2,779 10.37 0.0139
2019-08-12 2019-06-30 13F CLEAN HARBORS COM 184496107 35,419 -938 -2.58 2,518 -3.19 0.0132
2019-05-15 2019-03-31 13F CLEAN HARBORS COM 184496107 36,357 9,665 36.21 2,601 97.49 0.0136
2019-02-01 2018-12-31 13F CLEAN HARBORS COM 184496107 26,692 -1,979 -6.90 1,317 -35.82 0.0076
2018-11-09 2018-09-30 13F CLEAN HARBORS COM 184496107 28,671 206 0.72 2,052 29.87 0.0103
2018-08-10 2018-06-30 13F CLEAN HARBORS COM 184496107 28,465 856 3.10 1,580 17.21 0.0085
2018-05-04 2018-03-31 13F CLEAN HARBORS COM 184496107 27,609 7 0.03 1,348 -9.83 0.0072
2018-02-06 2017-12-31 13F CLEAN HARBORS COM 184496107 27,602 1,012 3.81 1,495 -0.93 0.0078
2017-11-13 2017-09-30 13F CLEAN HARBORS COM 184496107 26,590 -669 -2.45 1,509 -0.85 0.0082
2017-08-11 2017-06-30 13F CLEAN HARBORS COM 184496107 27,259 0 0.00 1,522 0.40 0.0090
2017-05-10 2017-03-31 13F CLEAN HARBORS COM 184496107 27,259 8,850 48.07 1,516 47.90 0.0092
2017-02-14 2016-12-31 13F CLEAN HARBORS COM 184496107 18,409 43 0.23 1,025 16.35 0.0064
2016-11-04 2016-09-30 13F CLEAN HARBORS COM 184496107 18,366 -2,093 -10.23 881 -17.35 0.0056
2016-08-04 2016-06-30 13F CLEAN HARBORS COM 184496107 20,459 -4,351 -17.54 1,066 -12.91 0.0072
2016-05-11 2016-03-31 13F CLEAN HARBORS COM 184496107 24,810 -26,341 -51.50 1,224 -42.54 0.0083
2016-02-12 2015-12-31 13F CLEAN HARBORS COM 184496107 51,151 1,083 2.16 2,130 -3.27 0.0141
2015-11-13 2015-09-30 13F CLEAN HARBORS COM 184496107 50,068 -166 -0.33 2,202 -18.44 0.0150
2015-08-14 2015-06-30 13F CLEAN HARBORS COM 184496107 50,234 -5,687 -10.17 2,700 -14.96 0.0163
2015-05-14 2015-03-31 13F CLEAN HARBORS COM 184496107 55,921 -175 -0.31 3,175 17.85 0.0198
2015-02-12 2014-12-31 13F CLEAN HARBORS COM 184496107 56,096 24,528 77.70 2,694 58.28 0.0169
2014-11-14 2014-09-30 13F CLEAN HARBORS COM 184496107 31,568 1,988 6.72 1,702 -10.47 0.0119
2014-08-13 2014-06-30 13F CLEAN HARBORS COMMON 184496107 29,580 0 0.00 1,901 17.27 0.0795
2014-05-14 2014-03-31 13F CLEAN HARBORS COMMON STOCK 184496107 29,580 0 0.00 1,621 -8.62 0.0672
2014-02-12 2013-12-31 13F CLEAN HARBORS COMMON STOCK 184496107 29,580 29,580 1,774 0.0743
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.