Clean Harbors, Inc.
MX ˙ BMV ˙ US1844961078
SecurityMX:CLH1 / Clean Harbors, Inc.
InstitutionRhumbline Advisers
Latest Disclosed Ownership133,743 shares
Latest Disclosed Value $ 38,348,074
Rhumbline Advisers reports 2.74% increase in ownership of CLH1 / Clean Harbors, Inc.

On May 12, 2026 - Rhumbline Advisers filed a 13F-HR form disclosing ownership of 133,743 shares of Clean Harbors, Inc. (MX:CLH1) valued at $38,348,074 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 130,176 shares of Clean Harbors, Inc.. This represents a change in shares of 2.74% 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 133,743 3,567 2.74 38,348 25.64 0.0328
2026-02-13 2025-12-31 13F CLEAN HARBORS COM 184496107 130,176 -1,310 -1.00 30,524 -0.03 0.0247
2025-11-06 2025-09-30 13F CLEAN HARBORS COM 184496107 131,486 -2,158 -1.61 30,534 -1.17 0.0245
2025-08-12 2025-06-30 13F CLEAN HARBORS COM 184496107 133,644 -1,334 -0.99 30,896 16.13 0.0265
2025-05-29 2025-03-31 13F/A-1 CLEAN HARBORS COM 184496107 134,978 -1,626 -1.19 26,604 -15.37 0.0249
2025-04-08 2025-03-31 13F CLEAN HARBORS COM 184496107 134,978 -1,626 26,604 0.0249
2025-05-29 2024-12-31 13F/A-1 CLEAN HARBORS COM 184496107 136,604 875 0.64 31,438 -4.18 0.0281
2025-01-30 2024-12-31 13F CLEAN HARBORS COM 184496107 136,604 875 31,438 0.0281
2024-11-12 2024-09-30 13F CLEAN HARBORS COM 184496107 135,729 -1,221 -0.89 32,807 5.93 0.0296
2024-08-01 2024-06-30 13F CLEAN HARBORS COM 184496107 136,950 -1,896 -1.37 30,971 10.80 0.0291
2024-05-09 2024-03-31 13F CLEAN HARBORS COM 184496107 138,846 -6,147 -4.24 27,951 10.47 0.0268
2024-02-08 2023-12-31 13F CLEAN HARBORS COM 184496107 144,993 -5,381 -3.58 25,303 0.54 0.0265
2023-11-09 2023-09-30 13F CLEAN HARBORS COM 184496107 150,374 -2,641 -1.73 25,167 0.02 0.0292
2023-08-08 2023-06-30 13F CLEAN HARBORS COM 184496107 153,015 3,728 2.50 25,160 119,709.52 0.0282
2023-05-11 2023-03-31 13F CLEAN HARBORS COM 184496107 149,287 -1,899 -1.26 21 -99.88 0.0263
2023-02-14 2022-12-31 13F CLEAN HARBORS COM 184496107 151,186 3,883 2.64 17,253 6.50 0.0232
2022-11-10 2022-09-30 13F CLEAN HARBORS COM 184496107 147,303 4,266 2.98 16,200 29.19 0.0241
2022-08-11 2022-06-30 13F CLEAN HARBORS COM 184496107 143,037 14,687 11.44 12,540 -12.49 0.0183
2022-05-12 2022-03-31 13F CLEAN HARBORS COM 184496107 128,350 -2,478 -1.89 14,329 9.78 0.0184
2022-02-10 2021-12-31 13F CLEAN HARBORS COM 184496107 130,828 2,399 1.87 13,053 -2.15 0.0160
2021-11-12 2021-09-30 13F CLEAN HARBORS COM 184496107 128,429 -4,810 -3.61 13,340 7.49 0.0181
2021-08-05 2021-06-30 13F CLEAN HARBORS COM 184496107 133,239 -3,631 -2.65 12,410 7.87 0.0163
2021-05-06 2021-03-31 13F CLEAN HARBORS COM 184496107 136,870 -1,358 -0.98 11,505 9.37 0.0156
2021-02-10 2020-12-31 13F CLEAN HARBORS COM 184496107 138,228 1,366 1.00 10,519 37.18 0.0145
2020-11-12 2020-09-30 13F CLEAN HARBORS COM 184496107 136,862 -4,124 -2.93 7,668 -9.32 0.0120
2020-08-13 2020-06-30 13F CLEAN HARBORS COM 184496107 140,986 -1,216 -0.86 8,456 15.82 0.0141
2020-05-06 2020-03-31 13F CLEAN HARBORS COM 184496107 142,202 9,479 7.14 7,301 -35.85 0.0153
2020-02-05 2019-12-31 13F CLEAN HARBORS COM 184496107 132,723 636 0.48 11,381 11.61 0.0190
2019-10-23 2019-09-30 13F CLEAN HARBORS COM 184496107 132,087 3,278 2.54 10,197 11.35 0.0186
2019-08-14 2019-06-30 13F CLEAN HARBORS COM 184496107 128,809 930 0.73 9,158 0.12 0.0172
2019-05-01 2019-03-31 13F CLEAN HARBORS COM 184496107 127,879 -3,681 -2.80 9,147 40.90 0.0177
2019-01-31 2018-12-31 13F CLEAN HARBORS COM 184496107 131,560 45,467 52.81 6,492 5.34 0.0141
2018-11-07 2018-09-30 13F CLEAN HARBORS COM 184496107 86,093 -604 -0.70 6,163 27.97 0.0119
2018-08-06 2018-06-30 13F CLEAN HARBORS COM 184496107 86,697 -6,143 -6.62 4,816 6.27 0.0097
2018-05-02 2018-03-31 13F CLEAN HARBORS COM 184496107 92,840 -4,084 -4.21 4,532 -13.73 0.0095
2018-02-09 2017-12-31 13F CLEAN HARBORS COM 184496107 96,924 -1,078 -1.10 5,253 -5.47 0.0107
2017-11-06 2017-09-30 13F CLEAN HARBORS COM 184496107 98,002 -2,154 -2.15 5,557 -0.63 0.0121
2017-08-02 2017-06-30 13F CLEAN HARBORS COM 184496107 100,156 4,215 4.39 5,592 4.80 0.0128
2017-05-02 2017-03-31 13F CLEAN HARBORS COM 184496107 95,941 3,001 3.23 5,336 3.17 0.0125
2017-01-27 2016-12-31 13F CLEAN HARBORS COM 184496107 92,940 6,247 7.21 5,172 24.33 0.0131
2016-11-08 2016-09-30 13F CLEAN HARBORS COM 184496107 86,693 2,273 2.69 4,160 -5.43 0.0115
2016-08-11 2016-06-30 13F CLEAN HARBORS COM 184496107 84,420 -4,574 -5.14 4,399 0.18 0.0130
2016-05-02 2016-03-31 13F CLEAN HARBORS INC COM 184496107 88,994 1,170 1.33 4,391 20.04 0.0136
2016-02-03 2015-12-31 13F CLEAN HARBORS INC COM 184496107 87,824 -300 -0.34 3,658 -5.60 0.0118
2015-11-04 2015-09-30 13F CLEAN HARBORS INC COM 184496107 88,124 3,152 3.71 3,875 -15.13 0.0132
2015-08-04 2015-06-30 13F CLEAN HARBORS INC COM 184496107 84,972 2,248 2.72 4,566 -2.79 0.0146
2015-05-12 2015-03-31 13F CLEAN HARBORS INC COM 184496107 82,724 5,717 7.42 4,697 26.95 0.0135
2015-02-06 2014-12-31 13F CLEAN HARBORS INC COM 184496107 77,007 705 0.92 3,700 -10.06 0.0107
2014-11-12 2014-09-30 13F CLEAN HARBORS INC COM 184496107 76,302 -218 -0.28 4,114 -16.31 0.0124
2014-08-06 2014-06-30 13F CLEAN HARBORS INC COM 184496107 76,520 -11,141 -12.71 4,916 2.35 0.0144
2014-05-06 2014-03-31 13F CLEAN HARBORS INC COM 184496107 87,661 -2,782 -3.08 4,803 -11.43 0.0142
2014-02-03 2013-12-31 13F CLEAN HARBORS INC COM 184496107 90,443 -8,610 -8.69 5,423 -6.66 0.0160
2013-11-05 2013-09-30 13F CLEAN HARBORS INC COM 184496107 99,053 969 0.99 5,810 17.23 0.0180
2013-08-07 2013-06-30 13F CLEAN HARBORS INC COM 184496107 98,084 98,084 4,956 0.0159
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.