Clean Harbors, Inc.
US ˙ NYSE ˙ US1844961078

SecurityCLH / Clean Harbors, Inc.
InstitutionEthic Inc.
Latest Disclosed Ownership3,341 shares
Latest Disclosed Value $ 957,965
Ethic Inc. reports 33.85% increase in ownership of CLH / Clean Harbors, Inc.

On April 27, 2026 - Ethic Inc. filed a 13F-HR form disclosing ownership of 3,341 shares of Clean Harbors, Inc. (US:CLH) valued at $957,965 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 3, 2026 disclosing 2,496 shares of Clean Harbors, Inc.. This represents a change in shares of 33.85% during the quarter. The current value of the position is $957,631 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)
2026-04-27 2026-03-31 13F CLEAN HARBORS COM 184496107 3,341 845 33.85 958 63.59 0.0150
2026-02-03 2025-12-31 13F CLEAN HARBORS COM 184496107 2,496 -1,285 -33.99 585 -33.37 0.0090
2025-10-17 2025-09-30 13F CLEAN HARBORS COM 184496107 3,781 509 15.56 878 16.29 0.0144
2025-07-30 2025-06-30 13F CLEAN HARBORS COM 184496107 3,272 487 17.49 756 35.06 0.0135
2025-05-13 2025-03-31 13F CLEAN HARBORS COM 184496107 2,785 -310 -10.02 559 -21.49 0.0113
2025-02-14 2024-12-31 13F CLEAN HARBORS COM 184496107 3,095 1,734 127.41 712 160.81 0.0144
2024-11-13 2024-09-30 13F CLEAN HARBORS COM 184496107 1,361 -1,317 -49.18 274 -54.88 0.0069
2024-08-13 2024-06-30 13F CLEAN HARBORS COM 184496107 2,678 1,317 96.77 606 121.61 0.0142
2024-05-13 2024-03-31 13F CLEAN HARBORS COM 184496107 1,361 1,361 274 0.0069
2023-05-12 2023-03-31 13F CLEAN HARBORS COM 184496107 0 -2,222 -100.00 0 -100.00
2023-02-14 2022-12-31 13F CLEAN HARBORS COM 184496107 2,222 2,222 254 0.0137
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.