Clean Harbors, Inc.
MX ˙ BMV ˙ US1844961078
SecurityMX:CLH1 / Clean Harbors, Inc.
InstitutionQuadrant Capital Group Llc
Latest Disclosed Ownership4,103 shares
Latest Disclosed Value $ 1,176,454
Quadrant Capital Group Llc reports 4.56% increase in ownership of CLH1 / Clean Harbors, Inc.

On May 13, 2026 - Quadrant Capital Group Llc filed a 13F-HR/A form disclosing ownership of 4,103 shares of Clean Harbors, Inc. (MX:CLH1) valued at $1,176,454 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 3,924 shares of Clean Harbors, Inc.. This represents a change in shares of 4.56% 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)
2026-05-13 2026-03-31 13F/A-1 CLEAN HARBORS COM 184496107 4,103 179 4.56 1,176 27.83 0.0352
2026-05-11 2026-03-31 13F CLEAN HARBORS COM 184496107 4,103 179 49 0.0369
2026-02-12 2025-12-31 13F CLEAN HARBORS COM 184496107 3,924 25 0.64 920 1.66 0.0278
2025-11-13 2025-09-30 13F CLEAN HARBORS COM 184496107 3,899 6 0.15 905 0.67 0.0294
2025-08-13 2025-06-30 13F CLEAN HARBORS COM 184496107 3,893 1,031 36.02 900 59.40 0.0324
2025-05-13 2025-03-31 13F CLEAN HARBORS COM 184496107 2,862 2,538 783.33 564 662.16 0.0210
2025-02-13 2024-12-31 13F CLEAN HARBORS COM 184496107 324 -43 -11.72 75 -15.91 0.0051
2024-11-12 2024-09-30 13F CLEAN HARBORS COM 184496107 367 50 15.77 89 23.94 0.0062
2024-08-12 2024-06-30 13F CLEAN HARBORS COM 184496107 317 14 4.62 72 18.33 0.0053
2024-05-15 2024-03-31 13F CLEAN HARBORS COM 184496107 303 55 22.18 61 39.53 0.0048
2024-02-08 2023-12-31 13F CLEAN HARBORS COM 184496107 248 -91 -26.84 43 -23.21 0.0037
2023-11-14 2023-09-30 13F CLEAN HARBORS COM 184496107 339 169 99.41 57 107.41 0.0057
2023-08-10 2023-06-30 13F CLEAN HARBORS COM 184496107 170 -4 -2.30 28 12.50 0.0028
2023-05-11 2023-03-31 13F CLEAN HARBORS COM 184496107 174 82 89.13 25 140.00 0.0026
2023-02-13 2022-12-31 13F CLEAN HARBORS COM 184496107 92 -8 -8.00 10 -9.09 0.0012
2022-11-10 2022-09-30 13F CLEAN HARBORS COM 184496107 100 4 4.17 11 37.50 0.0015
2022-08-09 2022-06-30 13F CLEAN HARBORS COM 184496107 96 -2 -2.04 8 -27.27 0.0011
2022-05-06 2022-03-31 13F CLEAN HARBORS COM 184496107 98 6 6.52 11 22.22 0.0013
2022-02-01 2021-12-31 13F CLEAN HARBORS COM 184496107 92 0 0.00 9 -10.00 0.0011
2021-11-12 2021-09-30 13F CLEAN HARBORS COM 184496107 92 0 0.00 10 11.11 0.0014
2021-08-09 2021-06-30 13F CLEAN HARBORS COM 184496107 92 0 0.00 9 12.50 0.0013
2021-05-12 2021-03-31 13F CLEAN HARBORS COM 184496107 92 0 0.00 8 14.29 0.0013
2021-02-16 2020-12-31 13F CLEAN HARBORS COM 184496107 92 0 0.00 7 40.00 0.0013
2020-11-13 2020-09-30 13F CLEAN HARBORS COM 184496107 92 0 0.00 5 -16.67 0.0011
2020-08-13 2020-06-30 13F CLEAN HARBORS COM 184496107 92 -13 -12.38 6 0.00 0.0013
2020-05-15 2020-03-31 13F Clean Harbors Com 184496107 105 67 176.32 6 100.00 0.0010
2020-03-19 2019-12-31 13F/A-1 Clean Harbors Com 184496107 38 0 0.00 3 50.00 0.0004
2020-02-03 2019-12-31 13F Clean Harbors Com 184496107 38 0 3 10.1374
2019-10-24 2019-09-30 13F Clean Harbors COM 184496107 38 0 0.00 2 0.00 0.0003
2019-07-24 2019-06-30 13F Clean Harbors COM 184496107 38 -763 -95.26 2 -96.43 0.0003
2019-04-29 2019-03-31 13F Clean Harbors COM 184496107 801 801 56 0.0098
2018-08-08 2018-06-30 13F Clean Harbors COM 184496107 0 -33 -100.00 0 -100.00
2018-05-10 2018-03-31 13F Clean Harbors COM 184496107 33 0 0.00 1 0.00 0.0004
2018-01-31 2017-12-31 13F Clean Harbors COM 184496107 33 0 0.00 1 0.00 0.0004
2017-10-13 2017-09-30 13F Clean Harbors COM 184496107 33 33 1 0.0004
2016-10-25 2016-09-30 13F Clean Harbors COM 184496107 0 -20 -100.00 0 -100.00
2016-07-28 2016-06-30 13F Clean Harbors COM 184496107 20 20 0.00 1 0.0007
2016-04-27 2016-03-31 13F Clean Harbors COM 184496107 0 0 0 0.0000
2016-01-28 2015-12-31 13F Clean Harbors COM 184496107 0 -10 -100.00 0 0.0000
2015-10-28 2015-09-30 13F Clean Harbors COM 184496107 10 10 0 0.0000
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.