Clean Harbors, Inc.
MX ˙ BMV ˙ US1844961078
SecurityMX:CLH1 / Clean Harbors, Inc.
InstitutionAsset Management One Co., Ltd.
Latest Disclosed Ownership62,011 shares
Latest Disclosed Value $ 17,770,489
Asset Management One Co., Ltd. reports 5.67% decrease in ownership of CLH1 / Clean Harbors, Inc.

On May 8, 2026 - Asset Management One Co., Ltd. filed a 13F-HR form disclosing ownership of 62,011 shares of Clean Harbors, Inc. (MX:CLH1) valued at $17,770,489 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 27, 2026 disclosing 65,740 shares of Clean Harbors, Inc.. This represents a change in shares of -5.67% 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)
2026-05-08 2026-03-31 13F CLEAN HARBORS COM 184496107 62,011 -3,729 -5.67 17,770 12.56 0.0524
2026-01-27 2025-12-31 13F CLEAN HARBORS COM 184496107 65,740 -20,617 -23.87 15,788 -21.29 0.0439
2025-10-22 2025-09-30 13F CLEAN HARBORS COM 184496107 86,357 398 0.46 20,058 0.94 0.0581
2025-07-31 2025-06-30 13F CLEAN HARBORS COM 184496107 85,959 -15,458 -15.24 19,872 -0.60 0.0623
2025-04-23 2025-03-31 13F CLEAN HARBORS COM 184496107 101,417 15,907 18.60 19,990 1.79 0.0691
2025-01-30 2024-12-31 13F CLEAN HARBORS COM 184496107 85,510 42,555 99.07 19,639 89.16 0.0675
2024-10-30 2024-09-30 13F CLEAN HARBORS COM 184496107 42,955 974 2.32 10,383 9.35 0.0369
2024-07-18 2024-06-30 13F CLEAN HARBORS COM 184496107 41,981 -1,471 -3.39 9,494 8.54 0.0363
2024-05-02 2024-03-31 13F CLEAN HARBORS COM 184496107 43,452 2 0.00 8,747 14.41 0.0337
2024-01-24 2023-12-31 13F CLEAN HARBORS COM 184496107 43,450 -2,977 -6.41 7,645 -1.61 0.0308
2023-10-19 2023-09-30 13F CLEAN HARBORS COM 184496107 46,427 -5,902 -11.28 7,770 -9.69 0.0346
2023-07-31 2023-06-30 13F CLEAN HARBORS COM 184496107 52,329 -13,991 -21.10 8,604 -8.99 0.0364
2023-04-25 2023-03-31 13F CLEAN HARBORS COM 184496107 66,320 -15,638 -19.08 9,455 0.23 0.0429
2023-02-06 2022-12-31 13F CLEAN HARBORS COM 184496107 81,958 -10,642 -11.49 9,433 -7.38 0.0460
2022-11-04 2022-09-30 13F CLEAN HARBORS COM 184496107 92,600 -4,097 -4.24 10,184 20.14 0.0518
2022-07-29 2022-06-30 13F CLEAN HARBORS COM 184496107 96,697 -3,044 -3.05 8,477 -23.87 0.0398
2022-05-13 2022-03-31 13F CLEAN HARBORS COM 184496107 99,741 7,486 8.11 11,135 21.96 0.0435
2022-02-09 2021-12-31 13F CLEAN HARBORS COM 184496107 92,255 8,913 10.69 9,130 5.48 0.0318
2021-11-02 2021-09-30 13F CLEAN HARBORS COM 184496107 83,342 8,476 11.32 8,656 24.14 0.0332
2021-08-03 2021-06-30 13F CLEAN HARBORS COM 184496107 74,866 11,659 18.45 6,973 31.24 0.0259
2021-05-14 2021-03-31 13F CLEAN HARBORS COM 184496107 63,207 9,165 16.96 5,313 31.44 0.0211
2021-02-12 2020-12-31 13F CLEAN HARBORS COM 184496107 54,042 3,743 7.44 4,042 43.44 0.0166
2020-11-13 2020-09-30 13F CLEAN HARBORS COM 184496107 50,299 19,237 61.93 2,818 51.26 0.0130
2020-08-14 2020-06-30 13F CLEAN HARBORS COM 184496107 31,062 2,787 9.86 1,863 28.31 0.0092
2020-05-14 2020-03-31 13F CLEAN HARBORS COM 184496107 28,275 7,920 38.91 1,452 -16.79 0.0085
2020-02-14 2019-12-31 13F CLEAN HARBORS COM 184496107 20,355 -4,446 -17.93 1,745 -8.88 0.0079
2019-11-14 2019-09-30 13F CLEAN HARBORS COM 184496107 24,801 -299 -1.19 1,915 7.28 0.0092
2019-08-14 2019-06-30 13F CLEAN HARBORS COM 184496107 25,100 4,340 20.91 1,785 20.20 0.0088
2019-05-15 2019-03-31 13F CLEAN HARBORS COM 184496107 20,760 -2,660 -11.36 1,485 28.46 0.0080
2019-02-13 2018-12-31 13F CLEAN HARBORS COM 184496107 23,420 5,980 34.29 1,156 -7.37 0.0028
2018-11-14 2018-09-30 13F CLEAN HARBORS COM 184496107 17,440 8,370 92.28 1,248 147.62 0.0026
2018-08-14 2018-06-30 13F CLEAN HARBORS COM 184496107 9,070 930 11.43 504 26.95 0.0011
2018-05-14 2018-03-31 13F CLEAN HARBORS COM 184496107 8,140 2,220 37.50 397 23.68 0.0009
2018-02-14 2017-12-31 13F CLEAN HARBORS COM 184496107 5,920 940 18.88 321 13.83 0.0007
2017-11-14 2017-09-30 13F CLEAN HARBORS COM 184496107 4,980 1,340 36.81 282 38.92 0.0007
2017-08-14 2017-06-30 13F CLEAN HARBORS COM 184496107 3,640 110 3.12 203 3.57 0.0005
2017-05-11 2017-03-31 13F CLEAN HARBORS COM 184496107 3,530 480 15.74 196 15.29 0.0005
2017-05-02 2016-12-31 13F/A-1 CLEAN HARBORS COM 184496107 3,050 -35,936 -92.18 170 -90.86 0.0004
2017-02-13 2016-12-31 13F CLEAN HARBORS COM 184496107 3,050 170
2016-11-07 2016-09-30 13F CLEAN HARBORS COM 184496107 38,986 -3,829 -8.94 1,859 -15.11 0.0276
2016-08-03 2016-06-30 13F CLEAN HARBORS COM 184496107 42,815 7,219 20.28 2,190 23.80 0.0329
2016-05-05 2016-03-31 13F CLEAN HARBORS COM 184496107 35,596 2,135 6.38 1,769 23.10 0.0258
2016-01-28 2015-12-31 13F CLEAN HARBORS COM 184496107 33,461 -3,110 -8.50 1,437 -9.22 0.0214
2015-11-12 2015-09-30 13F CLEAN HARBORS COM 184496107 36,571 -16,045 -30.49 1,583 -43.67 0.0241
2015-08-06 2015-06-30 13F CLEAN HARBORS COM 184496107 52,616 -9,435 -15.21 2,810 -20.10 0.0389
2015-05-11 2015-03-31 13F CLEAN HARBORS COM 184496107 62,051 -3,641 -5.54 3,517 5.14 0.0434
2015-02-09 2014-12-31 13F CLEAN HARBORS COM 184496107 65,692 51,600 366.17 3,345 337.83 0.0434
2014-11-05 2014-09-30 13F CLEAN HARBORS COM 184496107 14,092 8,492 151.64 764 113.41 0.0105
2014-08-12 2014-06-30 13F CLEAN HARBORS Com 184496107 5,600 -10,800 -65.85 358 -60.22 0.0053
2014-05-05 2014-03-31 13F CLEAN HARBORS Com 184496107 16,400 -1,400 -7.87 900 -15.25 0.0142
2014-02-05 2013-12-31 13F/A-1 CLEAN HARBORS COM 184496107 17,800 0 0.00 1,062 2.71 0.0165
2014-01-29 2013-12-31 13F CLEAN HARBORS COM 184496107 17,800 1,062
2014-02-05 2013-09-30 13F/A-1 CLEAN HARBORS COM 184496107 17,800 1,200 7.23 1,034 22.66 0.0156
2013-11-06 2013-09-30 13F CLEAN HARBORS Com 184496107 17,800 1,034
2014-02-12 2013-06-30 13F/A-1 CLEAN HARBORS COM 184496107 16,600 16,600 843 0.0137
2013-08-05 2013-06-30 13F CLEAN HARBORS Com 184496107 16,600 843
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.