Clean Harbors, Inc.
MX ˙ BMV ˙ US1844961078
SecurityMX:CLH1 / Clean Harbors, Inc.
InstitutionColonial Trust Advisors
Latest Disclosed Ownership9,128 shares
Latest Disclosed Value $ 2,617,271
Colonial Trust Advisors reports 0.65% decrease in ownership of CLH1 / Clean Harbors, Inc.

On May 12, 2026 - Colonial Trust Advisors filed a 13F-HR form disclosing ownership of 9,128 shares of Clean Harbors, Inc. (MX:CLH1) valued at $2,617,271 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 9,188 shares of Clean Harbors, Inc.. This represents a change in shares of -0.65% 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)
2026-05-12 2026-03-31 13F CLEAN HARBORS INC COM Stock 184496107 9,128 -60 -0.65 2,617 21.49 0.2034
2026-02-12 2025-12-31 13F CLEAN HARBORS INC COM Stock 184496107 9,188 -222 -2.36 2,154 -1.42 0.1621
2025-11-10 2025-09-30 13F CLEAN HARBORS INC COM Stock 184496107 9,410 -35 -0.37 2,185 0.09 0.1683
2025-08-13 2025-06-30 13F CLEAN HARBORS INC COM Stock 184496107 9,445 0 0.00 2,183 17.30 0.1804
2025-05-14 2025-03-31 13F CLEAN HARBORS INC COM Stock 184496107 9,445 -25 -0.26 1,862 -14.59 0.1656
2025-02-13 2024-12-31 13F CLEAN HARBORS INC COM Stock 184496107 9,470 -209 -2.16 2,179 -6.84 0.1932
2024-11-12 2024-09-30 13F CLEAN HARBORS INC COM Stock 184496107 9,679 -112 -1.14 2,340 5.65 0.2023
2024-08-14 2024-06-30 13F CLEAN HARBORS INC COM Stock 184496107 9,791 -109 -1.10 2,214 11.14 0.2120
2024-05-14 2024-03-31 13F CLEAN HARBORS INC COM Stock 184496107 9,900 -50 -0.50 1,993 14.75 0.1971
2024-02-14 2023-12-31 13F CLEAN HARBORS INC COM Stock 184496107 9,950 -400 -3.86 1,736 0.23 0.1842
2023-11-13 2023-09-30 13F CLEAN HARBORS INC COM Stock 184496107 10,350 -100 -0.96 1,732 0.81 0.1984
2023-08-14 2023-06-30 13F CLEAN HARBORS INC COM Stock 184496107 10,450 -50 -0.48 1,718 14.84 0.1910
2023-05-11 2023-03-31 13F CLEAN HARBORS INC COM Stock 184496107 10,500 -150 -1.41 1,497 23.13 0.1759
2023-02-14 2022-12-31 13F CLEAN HARBORS INC COM Stock 184496107 10,650 182 1.74 1,215 5.56 0.1491
2022-11-14 2022-09-30 13F CLEAN HARBORS INC COM Stock 184496107 10,468 -100 -0.95 1,151 24.30 0.1559
2022-08-12 2022-06-30 13F CLEAN HARBORS CS 184496107 10,568 0 0.00 926 -21.53 0.1302
2022-05-09 2022-03-31 13F CLEAN HARBORS CS 184496107 10,568 -82 -0.77 1,180 11.01 0.1397
2022-02-14 2021-12-31 13F CLEAN HARBORS CS 184496107 10,650 -250 -2.29 1,063 -6.10 0.1189
2021-11-12 2021-09-30 13F CLEAN HARBORS CS 184496107 10,900 -350 -3.11 1,132 8.02 0.1396
2021-08-05 2021-06-30 13F CLEAN HARBORS CS 184496107 11,250 0 0.00 1,048 10.78 0.1279
2021-05-10 2021-03-31 13F CLEAN HARBORS CS 184496107 11,250 -875 -7.22 946 2.49 0.1243
2021-01-29 2020-12-31 13F CLEAN HARBORS CS 184496107 12,125 -550 -4.34 923 30.00 0.1281
2020-10-26 2020-09-30 13F CLEAN HARBORS CS 184496107 12,675 -825 -6.11 710 -12.35 0.1116
2020-08-10 2020-06-30 13F CLEAN HARBORS CS 184496107 13,500 -1,150 -7.85 810 7.71 0.1382
2020-05-06 2020-03-31 13F CLEAN HARBORS CS 184496107 14,650 -1,150 -7.28 752 -44.50 0.1574
2020-02-14 2019-12-31 13F CLEAN HARBORS CS 184496107 15,800 -650 -3.95 1,355 6.69 0.2249
2019-11-15 2019-09-30 13F CLEAN HARBORS CS 184496107 16,450 -1,725 -9.49 1,270 -1.70 0.2246
2019-08-21 2019-06-30 13F CLEAN HARBORS CS 184496107 18,175 -425 -2.28 1,292 -2.86 0.2338
2019-05-15 2019-03-31 13F CLEAN HARBORS CS 184496107 18,600 1,300 7.51 1,330 55.74 0.2524
2019-02-11 2018-12-31 13F CLEAN HARBORS CS 184496107 17,300 -1,483 -7.90 854 -36.51 0.2086
2018-11-14 2018-09-30 13F CLEAN HARBORS CS 184496107 18,783 -100 -0.53 1,345 28.22 0.2515
2018-08-14 2018-06-30 13F CLEAN HARBORS CS 184496107 18,883 -395 -2.05 1,049 11.48 0.2079
2018-05-09 2018-03-31 13F CLEAN HARBORS CS 184496107 19,278 -2,525 -11.58 941 -20.39 0.1918
2018-02-21 2017-12-31 13F CLEAN HARBORS CS 184496107 21,803 1,366 6.68 1,182 1.98 0.1832
2017-11-14 2017-09-30 13F CLEAN HARBORS CS 184496107 20,437 -763 -3.60 1,159 -2.11 0.2546
2017-08-14 2017-06-30 13F CLEAN HBRS CS 184496107 21,200 1,692 8.67 1,184 2.42 0.2688
2017-05-15 2017-03-31 13F CLEAN HARBORS CS 184496107 19,508 -2,437 -11.11 1,156 -5.32 0.3557
2017-02-13 2016-12-31 13F CLEAN HARBORS CS 184496107 21,945 -2,055 -8.56 1,221 5.99 0.3941
2016-10-18 2016-09-30 13F CLEAN HARBORS CS 184496107 24,000 -250 -1.03 1,152 -8.86 0.3619
2016-08-22 2016-06-30 13F CLEAN HARBORS CS 184496107 24,250 -175 -0.72 1,264 4.90 0.4044
2016-05-13 2016-03-31 13F CLEAN HARBORS CS 184496107 24,425 -200 -0.81 1,205 17.45 0.3932
2016-02-12 2015-12-31 13F CLEAN HARBORS CS 184496107 24,625 -1,675 -6.37 1,026 -11.25 0.3412
2015-11-18 2015-09-30 13F CLEAN HARBORS CS 184496107 26,300 -650 -2.41 1,156 -20.17 0.3882
2015-08-05 2015-06-30 13F CLEAN HARBORS CS 184496107 26,950 -1,150 -4.09 1,448 -9.27 0.4488
2015-06-01 2015-03-31 13F CLEAN HARBORS CS 184496107 28,100 4,225 17.70 1,596 39.15 0.4876
2015-02-13 2014-12-31 13F CLEAN HARBORS CS 184496107 23,875 -6,825 -22.23 1,147 -30.69 0.4436
2014-11-14 2014-09-30 13F CLEAN HARBORS CS 184496107 30,700 -100 -0.32 1,655 -16.37 0.5126
2014-08-14 2014-06-30 13F CLEAN HARBORS CS 184496107 30,800 -1,350 -4.20 1,979 12.38 0.6015
2014-05-15 2014-03-31 13F CLEAN HARBORS CS 184496107 32,150 -4,125 -11.37 1,761 -19.03 0.5507
2014-02-14 2013-12-31 13F CLEAN HARBORS CS 184496107 36,275 -4,475 -10.98 2,175 -9.00 0.6831
2013-11-14 2013-09-30 13F CLEAN HARBORS CS 184496107 40,750 -19,350 -32.20 2,390 -21.30 0.8091
2013-08-14 2013-06-30 13F CLEAN HARBORS CS 184496107 60,100 60,100 3,037 1.0765
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.