Clean Harbors, Inc.
US ˙ NYSE ˙ US1844961078

SecurityCLH / Clean Harbors, Inc.
InstitutionKBC Group NV
Latest Disclosed Ownership1,560 shares
Latest Disclosed Value $ 447
KBC Group NV reports 24.30% increase in ownership of CLH / Clean Harbors, Inc.

On May 7, 2026 - KBC Group NV filed a 13F-HR form disclosing ownership of 1,560 shares of Clean Harbors, Inc. (US:CLH) valued at $447,299 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 1,255 shares of Clean Harbors, Inc.. The current value of the position is $447,143 USD.

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)
2026-05-07 2026-03-31 13F CLEAN HARBORS COM 184496107 1,560 305 24.30 0 0.0006
2026-01-26 2025-12-31 13F CLEAN HARBORS COM 184496107 1,255 0 0.00 0 0.0007
2026-01-20 2025-09-30 13F CLEAN HARBORS COM 184496107 1,255 0 0.00 0 0.0007
2025-08-08 2025-06-30 13F CLEAN HARBORS COM 184496107 1,255 -806 -39.11 0 0.0008
2025-04-25 2025-03-31 13F CLEAN HARBORS COM 184496107 2,061 72 3.62 0 0.0013
2025-01-22 2024-12-31 13F CLEAN HARBORS COM 184496107 1,989 577 40.86 0 0.0013
2024-11-06 2024-09-30 13F CLEAN HARBORS COM 184496107 1,412 205 16.98 0 0.0010
2024-07-17 2024-06-30 13F CLEAN HARBORS COM 184496107 1,207 101 9.13 0 0.0008
2024-05-08 2024-03-31 13F CLEAN HARBORS COM 184496107 1,106 256 30.12 0 0.0007
2024-02-13 2023-12-31 13F CLEAN HARBORS COM 184496107 850 0 0.00 0 0.0005
2024-02-15 2023-09-30 13F/A-1 CLEAN HARBORS COM 184496107 850 850 0 0.0006
2024-02-14 2022-06-30 13F/A-1 CLEAN HARBORS COM 184496107 0 -4,516 -100.00 0 -100.00 0.0000
2022-07-26 2022-06-30 13F CLEAN HARBORS COM 184496107 0 -4,516 0
2024-02-14 2022-03-31 13F/A-1 CLEAN HARBORS COM 184496107 4,516 -1,930 -29.94 1 0.0020
2022-05-06 2022-03-31 13F CLEAN HARBORS COM 184496107 4,516 -1,930 504 0.0019
2024-02-14 2021-12-31 13F/A-1 CLEAN HARBORS COM 184496107 6,446 -1,296 -16.74 1 -100.00 0.0021
2022-02-03 2021-12-31 13F CLEAN HARBORS COM 184496107 6,446 -1,296 643 0.0020
2021-11-10 2021-09-30 13F CLEAN HARBORS COM 184496107 7,742 -2,227 -22.34 804 -13.46 0.0029
2022-02-15 2021-06-30 13F/A-1 CLEAN HARBORS COM 184496107 9,969 -144 -1.42 929 9.29 0.0033
2021-08-11 2021-06-30 13F CLEAN HARBORS COM 184496107 9,969 -144 929 0.0033
2022-02-14 2021-03-31 13F/A-1 CLEAN HARBORS COM 184496107 10,113 -2,685 -20.98 850 -91.27 0.0034
2021-04-26 2021-03-31 13F CLEAN HARBORS COM 184496107 10,113 -2,685 850 0.0034
2022-02-14 2020-12-31 13F/A-1 CLEAN HARBORS COM 184496107 12,798 1,975 18.25 9,739 1,507.10 0.0046
2021-02-10 2020-12-31 13F CLEAN HARBORS COM 184496107 12,798 1,975 974 0.0045
2022-02-14 2020-09-30 13F/A-1 CLEAN HARBORS COM 184496107 10,823 -135,401 -92.60 606 -93.09 0.0036
2020-10-28 2020-09-30 13F CLEAN HARBORS COM 184496107 10,823 -135,401 606 0.0036
2022-02-14 2020-06-30 13F/A-1 CLEAN HARBORS COM 184496107 146,224 -7,285 -4.75 8,770 11.28 0.0580
2020-08-10 2020-06-30 13F CLEAN HARBORS COM 184496107 146,224 -7,285 8,770 0.0587
2020-05-04 2020-03-31 13F CLEAN HARBORS COM 184496107 153,509 58,332 61.29 7,881 -3.43 0.0660
2020-02-11 2019-12-31 13F CLEAN HARBORS COM 184496107 95,177 89,942 1,718.09 8,161 1,920.05 0.0516
2019-11-07 2019-09-30 13F CLEAN HARBORS COM 184496107 5,235 -4,876 -48.22 404 -43.81 0.0030
2019-08-08 2019-06-30 13F/A-1 CLEAN HARBORS COM 184496107 10,111 4,889 93.62 719 92.76 0.0056
2019-07-30 2019-06-30 13F CLEAN HARBORS COM 184496107 10,111 4,889 719
2019-08-07 2019-03-31 13F/A-1 CLEAN HARBORS COM 184496107 5,222 -1,008 -16.18 373 21.50 0.0031
2019-05-10 2019-03-31 13F CLEAN HARBORS COM 184496107 5,222 -1,008 373
2019-01-31 2018-12-31 13F CLEAN HARBORS COM 184496107 6,230 0 0.00 307 -31.17 0.0034
2018-11-14 2018-09-30 13F CLEAN HARBORS COM 184496107 6,230 0 0.00 446 28.90 0.0034
2018-08-03 2018-06-30 13F CLEAN HARBORS COM 184496107 6,230 0 0.00 346 13.82 0.0030
2018-08-03 2018-03-31 13F/A-1 CLEAN HARBORS COM 184496107 6,230 0 0.00 304 -10.06 0.0028
2018-05-09 2018-03-31 13F CLEAN HARBORS COM 184496107 6,230 0 304
2018-08-03 2017-12-31 13F/A-1 CLEAN HARBORS COM 184496107 6,230 1,700 37.53 338 31.52 0.0029
2018-02-07 2017-12-31 13F CLEAN HARBORS COM 184496107 6,230 1,700 338
2017-11-13 2017-09-30 13F CLEAN HARBORS COM 184496107 4,530 0 0.00 257 1.58 0.0023
2017-08-04 2017-06-30 13F CLEAN HARBORS COM 184496107 4,530 0 0.00 253 0.40 0.0024
2017-05-10 2017-03-31 13F CLEAN HARBORS COM 184496107 4,530 -10,034 -68.90 252 -71.13 0.0023
2014-01-21 2013-12-31 13F CLEAN HARBORS COM 184496107 14,564 1,843 14.49 873 17.02 0.0132
2013-11-06 2013-09-30 13F CLEAN HARBORS COM 184496107 12,721 -708 -5.27 746 9.87 0.0120
2013-07-29 2013-06-30 13F CLEAN HARBORS COM 184496107 13,429 13,429 679 0.0126
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.