Clean Harbors, Inc.
MX ˙ BMV ˙ US1844961078
SecurityMX:CLH1 / Clean Harbors, Inc.
InstitutionSoutheast Asset Advisors Inc.
Latest Disclosed Ownership8,759 shares
Latest Disclosed Value $ 2,511,468
Southeast Asset Advisors Inc. reports 25.78% increase in ownership of CLH1 / Clean Harbors, Inc.

On May 13, 2026 - Southeast Asset Advisors Inc. filed a 13F-HR form disclosing ownership of 8,759 shares of Clean Harbors, Inc. (MX:CLH1) valued at $2,511,468 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 6,964 shares of Clean Harbors, Inc.. This represents a change in shares of 25.78% 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 CLEAN HARBORS COM 184496107 8,759 1,795 25.78 2,511 53.86 0.2752
2026-02-13 2025-12-31 13F CLEAN HARBORS COM 184496107 6,964 898 14.80 1,633 15.91 0.1550
2025-11-07 2025-09-30 13F CLEAN HARBORS COM 184496107 6,066 -668 -9.92 1,409 -9.51 0.1534
2025-08-12 2025-06-30 13F CLEAN HARBORS COM 184496107 6,734 -1,960 -22.54 1,557 -9.17 0.1850
2025-05-14 2025-03-31 13F CLEAN HARBORS COM 184496107 8,694 -3,028 -25.83 1,714 -36.48 0.2101
2025-02-13 2024-12-31 13F CLEAN HARBORS COM 184496107 11,722 -2,524 -17.72 2,698 -21.67 0.3310
2024-11-13 2024-09-30 13F CLEAN HARBORS COM 184496107 14,246 -1,123 -7.31 3,443 -0.92 0.3808
2024-08-12 2024-06-30 13F CLEAN HARBORS COM 184496107 15,369 -146 -0.94 3,476 11.27 0.4179
2024-05-14 2024-03-31 13F CLEAN HARBORS COM 184496107 15,515 -3,315 -17.60 3,123 -4.96 0.3759
2024-02-13 2023-12-31 13F CLEAN HARBORS COM 184496107 18,830 1,087 6.13 3,286 10.68 0.4356
2023-11-14 2023-09-30 13F CLEAN HARBORS COM 184496107 17,743 14,496 446.44 2,969 457.04 0.4173
2023-08-10 2023-06-30 13F CLEAN HARBORS COM 184496107 3,247 3,247 534 0.0760
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.