Clean Harbors, Inc.
MX ˙ BMV ˙ US1844961078
SecurityMX:CLH1 / Clean Harbors, Inc.
InstitutionQuantinno Capital Management LP
Latest Disclosed Ownership380,945 shares
Latest Disclosed Value $ 109,228,477
Quantinno Capital Management LP reports 15.35% increase in ownership of CLH1 / Clean Harbors, Inc.

On May 15, 2026 - Quantinno Capital Management LP filed a 13F-HR form disclosing ownership of 380,945 shares of Clean Harbors, Inc. (MX:CLH1) valued at $109,228,477 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 330,243 shares of Clean Harbors, Inc.. This represents a change in shares of 15.35% 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)
2026-05-15 2026-03-31 13F CLEAN HARBORS COM 184496107 380,945 50,702 15.35 109,228 41.06 0.1823
2026-02-17 2025-12-31 13F CLEAN HARBORS COM 184496107 330,243 234,180 243.78 77,435 247.13 0.1555
2025-11-14 2025-09-30 13F CLEAN HARBORS COM 184496107 96,063 64,000 199.61 22,308 200.96 0.0609
2025-08-14 2025-06-30 13F CLEAN HARBORS COM 184496107 32,063 4,272 15.37 7,412 35.33 0.0320
2025-05-12 2025-03-31 13F CLEAN HARBORS COM 184496107 27,791 -8,872 -24.20 5,478 -35.08 0.0357
2025-02-14 2024-12-31 13F CLEAN HARBORS COM 184496107 36,663 2,292 6.67 8,438 1.56 0.0830
2024-11-14 2024-09-30 13F CLEAN HARBORS COM 184496107 34,371 10,502 44.00 8,308 53.92 0.1080
2024-08-14 2024-06-30 13F CLEAN HARBORS COM 184496107 23,869 -2,179 -8.37 5,398 2.92 0.0971
2024-05-14 2024-03-31 13F CLEAN HARBORS COM 184496107 26,048 5,642 27.65 5,244 47.26 0.1140
2024-02-14 2023-12-31 13F CLEAN HARBORS COM 184496107 20,406 -6,381 -23.82 3,561 -20.57 0.1246
2023-11-14 2023-09-30 13F CLEAN HARBORS COM 184496107 26,787 505 1.92 4,483 3.73 0.2041
2023-08-04 2023-06-30 13F CLEAN HARBORS COM 184496107 26,282 -568 -2.12 4,322 12.90 0.2469
2023-05-03 2023-03-31 13F CLEAN HARBORS COM 184496107 26,850 855 3.29 3,828 29.02 0.2532
2023-02-13 2022-12-31 13F CLEAN HARBORS COM 184496107 25,995 17,753 215.40 2,967 227.48 0.2213
2022-11-08 2022-09-30 13F CLEAN HARBORS COM 184496107 8,242 8,242 906 0.1167
2020-05-15 2020-03-31 13F CLEAN HARBORS COM 184496107 0 -5,116 -100.00 0 -100.00
2020-02-14 2019-12-31 13F CLEAN HARBORS COM 184496107 5,116 995 24.14 439 38.05 0.2763
2019-11-14 2019-09-30 13F CLEAN HARBORS COM 184496107 4,121 0 0.00 318 8.53 0.2142
2019-08-14 2019-06-30 13F CLEAN HARBORS COM 184496107 4,121 -4,459 -51.97 293 -52.28 0.1720
2019-05-14 2019-03-31 13F CLEAN HARBORS COM 184496107 8,580 8,580 614 0.3933
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.