Clean Harbors, Inc.
MX ˙ BMV ˙ US1844961078
SecurityMX:CLH1 / Clean Harbors, Inc.
InstitutionOppenheimer Asset Management Inc.
Latest Disclosed Ownership52,174 shares
Latest Disclosed Value $ 14,959,851
Oppenheimer Asset Management Inc. reports 3.91% decrease in ownership of CLH1 / Clean Harbors, Inc.

On April 23, 2026 - Oppenheimer Asset Management Inc. filed a 13F-HR form disclosing ownership of 52,174 shares of Clean Harbors, Inc. (MX:CLH1) valued at $14,959,851 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 2, 2026 disclosing 54,299 shares of Clean Harbors, Inc.. This represents a change in shares of -3.91% 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)
2026-04-23 2026-03-31 13F CLEAN HARBORS COM 184496107 52,174 -2,125 -3.91 14,960 17.49 0.0427
2026-02-02 2025-12-31 13F CLEAN HARBORS COM 184496107 54,299 -1,229 -2.21 12,732 -1.26 0.1565
2025-11-06 2025-09-30 13F CLEAN HARBORS COM 184496107 55,528 -2,322 -4.01 12,895 -3.58 0.1418
2025-07-31 2025-06-30 13F CLEAN HARBORS COM 184496107 57,850 6,613 12.91 13,374 32.43 0.1534
2025-04-23 2025-03-31 13F CLEAN HARBORS COM 184496107 51,237 13 0.03 10,099 -14.34 0.1253
2025-02-05 2024-12-31 13F CLEAN HARBORS COM 184496107 51,224 -2,844 -5.26 11,789 -9.79 0.1433
2024-11-05 2024-09-30 13F CLEAN HARBORS COM 184496107 54,068 -21,692 -28.63 13,069 -23.73 0.1573
2024-08-08 2024-06-30 13F CLEAN HARBORS COM 184496107 75,760 5,375 7.64 17,133 20.92 0.2189
2024-05-07 2024-03-31 13F CLEAN HARBORS COM 184496107 70,385 -5,279 -6.98 14,169 7.31 0.2076
2024-02-13 2023-12-31 13F CLEAN HARBORS COM 184496107 75,664 99 0.13 13,204 4.41 0.1837
2023-11-08 2023-09-30 13F CLEAN HARBORS COM 184496107 75,565 -27,355 -26.58 12,647 -25.27 0.1941
2023-08-03 2023-06-30 13F CLEAN HARBORS COM 184496107 102,920 -784 -0.76 16,923 14.47 0.2489
2023-05-10 2023-03-31 13F CLEAN HARBORS COM 184496107 103,704 -5,700 -5.21 14,784 18.41 0.2277
2023-02-07 2022-12-31 13F CLEAN HARBORS COM 184496107 109,404 18 0.02 12,485 3.78 0.2010
2022-11-14 2022-09-30 13F CLEAN HARBORS COM 184496107 109,386 -860 -0.78 12,030 24.47 0.2122
2022-08-08 2022-06-30 13F CLEAN HARBORS COM 184496107 110,246 12,444 12.72 9,665 -11.48 0.1619
2022-05-12 2022-03-31 13F CLEAN HARBORS COM 184496107 97,802 -951 -0.96 10,919 10.83 0.1550
2022-02-02 2021-12-31 13F CLEAN HARBORS COM 184496107 98,753 -7,961 -7.46 9,852 -11.12 0.1306
2021-11-12 2021-09-30 13F CLEAN HARBORS COM 184496107 106,714 -15,051 -12.36 11,085 -2.26 0.1576
2021-08-03 2021-06-30 13F CLEAN HARBORS COM 184496107 121,765 -1,322 -1.07 11,341 9.61 0.1615
2021-05-17 2021-03-31 13F CLEAN HARBORS COM 184496107 123,087 -24,844 -16.79 10,347 -8.09 0.1604
2021-02-11 2020-12-31 13F CLEAN HARBORS COM 184496107 147,931 41,795 39.38 11,258 89.31 0.1880
2020-11-13 2020-09-30 13F CLEAN HARBORS COM 184496107 106,136 -3,967 -3.60 5,947 -9.95 0.1155
2020-08-11 2020-06-30 13F CLEAN HARBORS COM 184496107 110,103 -5,440 -4.71 6,604 11.33 0.1363
2020-05-08 2020-03-31 13F CLEAN HARBORS COM 184496107 115,543 49,114 73.93 5,932 4.14 0.1457
2020-02-07 2019-12-31 13F CLEAN HARBORS COM 184496107 66,429 -6,182 -8.51 5,696 1.62 0.1203
2019-10-31 2019-09-30 13F CLEAN HARBORS COM 184496107 72,611 -6,047 -7.69 5,605 0.21 0.1245
2019-08-09 2019-06-30 13F CLEAN HARBORS COM 184496107 78,658 -8,630 -9.89 5,593 -10.43 0.1236
2019-04-24 2019-03-31 13F CLEAN HARBORS COM 184496107 87,288 -4,612 -5.02 6,244 37.68 0.1403
2019-01-30 2018-12-31 13F CLEAN HARBORS COM 184496107 91,900 -75,503 -45.10 4,535 -62.15 0.1124
2018-10-26 2018-09-30 13F CLEAN HARBORS COM 184496107 167,403 -22,388 -11.80 11,983 13.66 0.2655
2018-08-10 2018-06-30 13F CLEAN HARBORS COM 184496107 189,791 14,283 8.14 10,543 23.08 0.2579
2018-05-09 2018-03-31 13F CLEAN HARBORS COM 184496107 175,508 7,693 4.58 8,566 -9.97 0.2149
2018-02-07 2017-12-31 13F CLEAN HARBORS COM 184496107 167,815 0 0.00 9,515 0.00 0.2525
2017-11-14 2017-09-30 13F CLEAN HARBORS COM 184496107 167,815 2,822 1.71 9,515 3.30 0.2472
2017-08-09 2017-06-30 13F CLEAN HARBORS COM 184496107 164,993 9,490 6.10 9,211 6.50 0.2545
2017-05-15 2017-03-31 13F CLEAN HARBORS COM 184496107 155,503 155,503 8,649 0.2464
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.