Clean Harbors, Inc.
MX ˙ BMV ˙ US1844961078
SecurityMX:CLH1 / Clean Harbors, Inc.
InstitutionJanus Henderson Group Plc
Latest Disclosed Ownership2,355,394 shares
Latest Disclosed Value $ 675,367,739
Janus Henderson Group Plc reports 0.87% decrease in ownership of CLH1 / Clean Harbors, Inc.

On May 18, 2026 - Janus Henderson Group Plc filed a 13F-HR/A form disclosing ownership of 2,355,394 shares of Clean Harbors, Inc. (MX:CLH1) valued at $675,367,739 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 2,376,088 shares of Clean Harbors, Inc.. This represents a change in shares of -0.87% 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)
2026-05-18 2026-03-31 13F/A-1 CLEAN HARBORS COM 184496107 2,355,394 -20,694 -0.87 675,368 21.22 0.1139
2026-05-15 2026-03-31 13F CLEAN HARBORS COM 184496107 2,355,394 -20,694 -0.87 675,368 21.22 0.1253
2026-02-17 2025-12-31 13F CLEAN HARBORS COM 184496107 2,376,088 215,659 9.98 557,146 11.05 0.2495
2025-11-14 2025-09-30 13F CLEAN HARBORS COM 184496107 2,160,429 7,203 0.33 501,696 0.79 0.2290
2025-08-14 2025-06-30 13F CLEAN HARBORS COM 184496107 2,153,226 14,703 0.69 497,785 18.07 0.2440
2025-05-15 2025-03-31 13F CLEAN HARBORS COM 184496107 2,138,523 526,441 32.66 421,609 13.64 0.2311
2025-02-14 2024-12-31 13F CLEAN HARBORS COM 184496107 1,612,082 13,167 0.82 371,002 -4.00 0.1886
2024-11-14 2024-09-30 13F CLEAN HARBORS COM 184496107 1,598,915 7,948 0.50 386,477 7.42 0.1978
2024-08-14 2024-06-30 13F CLEAN HARBORS COM 184496107 1,590,967 4,506 0.28 359,796 12.66 0.1927
2024-05-15 2024-03-31 13F CLEAN HARBORS COM 184496107 1,586,461 78,848 5.23 319,371 21.39 0.1742
2024-02-14 2023-12-31 13F CLEAN HARBORS COM 184496107 1,507,613 80,559 5.65 263,092 10.16 0.1569
2023-11-14 2023-09-30 13F CLEAN HARBORS COM 184496107 1,427,054 253,767 21.63 238,832 23.80 0.1564
2023-08-14 2023-06-30 13F CLEAN HARBORS COM 184496107 1,173,287 190,467 19.38 192,921 37.69 0.1200
2023-05-15 2023-03-31 13F CLEAN HARBORS COM 184496107 982,820 972,802 9,710.54 140,108 12,168.65 0.0924
2023-02-14 2022-12-31 13F CLEAN HARBORS COM 184496107 10,018 0 0.00 1,143 3.44 0.0008
2023-01-13 2022-09-30 13F/A-1 CLEAN HARBORS COM 184496107 10,018 -552 -5.22 1,104 18.97 0.0008
2022-11-14 2022-09-30 13F CLEAN HARBORS COM 184496107 10,018 -552 1,104 0.0008
2022-08-15 2022-06-30 13F CLEAN HARBORS COM 184496107 10,570 -119 -1.11 928 -22.21 0.0006
2022-05-16 2022-03-31 13F CLEAN HARBORS COM 184496107 10,689 -107 -0.99 1,193 10.77 0.0006
2022-02-14 2021-12-31 13F CLEAN HARBORS COM 184496107 10,796 5,545 105.60 1,077 97.25 0.0004
2021-11-16 2021-09-30 13F CLEAN HARBORS COM 184496107 5,251 5,251 546 0.0002
2019-04-30 2019-03-31 13F CLEAN HARBORS COM 184496107 0 -651,217 -100.00 0 -100.00
2019-02-06 2018-12-31 13F CLEAN HARBORS COM 184496107 651,217 -200,546 -23.54 32,138 -47.29 0.0205
2018-11-09 2018-09-30 13F CLEAN HARBORS COM 184496107 851,763 -2,061 -0.24 60,969 28.55 0.0326
2018-08-10 2018-06-30 13F CLEAN HARBORS COM 184496107 853,824 182,311 27.15 47,430 44.71 0.0270
2018-05-14 2018-03-31 13F CLEAN HARBORS COM 184496107 671,513 -173,649 -20.55 32,777 -28.45 0.0193
2018-03-12 2017-12-31 13F/A-1 CLEAN HARBORS COM 184496107 845,162 -3,428 -0.40 45,808 -4.79 0.0282
2018-02-09 2017-12-31 13F CLEAN HARBORS COM 184496107 845,162 -3,428 45,808
2017-11-14 2017-09-30 13F CLEAN HARBORS COM 184496107 848,590 -188,929 -18.21 48,115 -16.94 0.0308
2017-08-17 2017-06-30 13F/A-1 CLEAN HARBORS COM 184496107 1,037,519 1,037,519 57,925 0.0395
2017-08-14 2017-06-30 13F CLEAN HARBORS COM 184496107 1,037,519 57,925
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.