Clean Harbors, Inc.
MX ˙ BMV ˙ US1844961078
SecurityMX:CLH1 / Clean Harbors, Inc.
InstitutionShelton Capital Management
Latest Disclosed Ownership7,709 shares
Latest Disclosed Value $ 2,210,402
Shelton Capital Management reports 0.72% decrease in ownership of CLH1 / Clean Harbors, Inc.

On May 15, 2026 - Shelton Capital Management filed a 13F-HR form disclosing ownership of 7,709 shares of Clean Harbors, Inc. (MX:CLH1) valued at $2,210,402 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 7,765 shares of Clean Harbors, Inc.. This represents a change in shares of -0.72% 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.

Upgrade to unlock premium data and export to Excel .

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 7,709 -56 -0.72 2,210 21.43 0.0483
2026-02-17 2025-12-31 13F CLEAN HARBORS COM 184496107 7,765 -129 -1.63 1,821 -0.71 0.0359
2025-11-14 2025-09-30 13F CLEAN HARBORS COM 184496107 7,894 0 0.00 1,833 0.49 0.0393
2025-08-13 2025-06-30 13F CLEAN HARBORS COM 184496107 7,894 -2,000 -20.21 1,825 -6.46 0.0420
2025-05-15 2025-03-31 13F CLEAN HARBORS COM 184496107 9,894 -100 -1.00 1,950 -15.22 0.0465
2025-02-13 2024-12-31 13F CLEAN HARBORS COM 184496107 9,994 -14,067 -58.46 2,300 -60.45 0.0572
2024-11-14 2024-09-30 13F CLEAN HARBORS COM 184496107 24,061 -3,039 -11.21 5,816 -5.11 0.1493
2024-08-13 2024-06-30 13F CLEAN HARBORS COM 184496107 27,100 -160 -0.59 6,129 11.68 0.1664
2024-05-15 2024-03-31 13F CLEAN HARBORS COM 184496107 27,260 -5,010 -15.53 5,488 -2.56 0.1558
2024-02-14 2023-12-31 13F CLEAN HARBORS COM 184496107 32,270 9,921 44.39 5,631 50.56 0.1783
2023-11-14 2023-09-30 13F CLEAN HARBORS COM 184496107 22,349 9,870 79.09 3,740 82.35 0.1370
2023-08-10 2023-06-30 13F CLEAN HARBORS COM 184496107 12,479 9,927 388.99 2,052 465.01 0.0737
2023-05-11 2023-03-31 13F CLEAN HARBORS COM 184496107 2,552 0 0.00 364 24.74 0.0152
2023-02-13 2022-12-31 13F CLEAN HARBORS COM 184496107 2,552 -100 -3.77 291 -0.34 0.0305
2022-11-14 2022-09-30 13F CLEAN HARBORS COM 184496107 2,652 0 0.00 292 25.32 0.0139
2022-08-11 2022-06-30 13F CLEAN HARBORS COM 184496107 2,652 0 0.00 233 -21.28 0.0105
2022-05-12 2022-03-31 13F CLEAN HARBORS COM 184496107 2,652 0 0.00 296 11.70 0.0109
2022-02-11 2021-12-31 13F CLEAN HARBORS COM 184496107 2,652 -207 -7.24 265 -10.77 0.0094
2021-11-15 2021-09-30 13F CLEAN HARBORS COM 184496107 2,859 0 0.00 297 11.65 0.0116
2021-08-12 2021-06-30 13F CLEAN HARBORS COM 184496107 2,859 0 0.00 266 10.83 0.0100
2021-05-14 2021-03-31 13F CLEAN HARBORS COM 184496107 2,859 0 0.00 240 10.09 0.0084
2021-02-16 2020-12-31 13F CLEAN HARBORS COM 184496107 2,859 2,859 218 0.0098
2020-05-13 2020-03-31 13F CLEAN HARBORS COM 184496107 0 -3,448 -100.00 0 -100.00
2020-02-11 2019-12-31 13F CLEAN HARBORS COM 184496107 3,448 0 0.00 296 11.28 0.0164
2019-11-13 2019-09-30 13F CLEAN HARBORS COM 184496107 3,448 0 0.00 266 8.57 0.0157
2019-08-14 2019-06-30 13F CLEAN HARBORS COM 184496107 3,448 3,165 1,118.37 245 -93.81 0.0141
2019-05-10 2019-03-31 13F CLEAN HARBORS COM 184496107 283 283 3,961 0.0156
2019-01-31 2018-12-31 13F CLEAN HARBORS COM 184496107 0 -3,961 -100.00 0 -100.00
2018-11-14 2018-09-30 13F CLEAN HARBORS COM 184496107 3,961 0 0.00 284 29.09 0.0162
2018-08-10 2018-06-30 13F CLEAN HARBORS COM 184496107 3,961 3,961 220 0.0137
2018-05-15 2018-03-31 13F CLEAN HARBORS COM 184496107 0 -3,961 -100.00 0 -100.00
2018-02-06 2017-12-31 13F CLEAN HARBORS COM 184496107 3,961 0 0.00 215 -4.44 0.0138
2017-11-28 2017-09-30 13F/A-1 CLEAN HARBORS COM 184496107 3,961 0 0.00 225 1.81 0.0152
2017-08-14 2017-06-30 13F CLEAN HARBORS COM 184496107 3,961 0 0.00 221 0.45 0.0156
2017-11-28 2017-03-31 13F/A-1 CLEAN HARBORS COM 184496107 3,961 -1,375 -25.77 220 -25.93 0.0152
2017-11-28 2016-12-31 13F/A-2 CLEAN HARBORS COM 184496107 5,336 0 0.00 297 16.02 0.0226
2017-12-06 2016-09-30 13F/A-2 CLEAN HARBORS COM 184496107 5,336 0 0.00 256 -7.91 0.0214
2017-12-04 2016-09-30 13F/A-1 CLEAN HARBORS COM 184496107 5,336 0 297 0.0189
2016-08-01 2016-06-30 13F CLEAN HARBORS COM 184496107 5,336 0 0.00 278 5.70 0.0245
2016-05-13 2016-03-31 13F CLEAN HARBORS COM 184496107 5,336 0 0.00 263 18.47 0.0238
2016-02-01 2015-12-31 13F CLEAN HARBORS COM 184496107 5,336 0 0.00 222 -5.53 0.0215
2015-11-02 2015-09-30 13F CLEAN HARBORS COM 184496107 5,336 0 0.00 235 -18.12 0.0259
2015-08-11 2015-06-30 13F CLEAN HARBORS COM 184496107 5,336 0 0.00 287 -5.28 0.0297
2015-05-12 2015-03-31 13F CLEAN HARBORS COM 184496107 5,336 0 0.00 303 18.36 0.0327
2015-02-10 2014-12-31 13F CLEAN HARBORS COM 184496107 5,336 0 0.00 256 -11.11 0.0298
2014-10-15 2014-09-30 13F CLEAN HARBORS COM 184496107 5,336 0 0.00 288 -16.03 0.0387
2014-07-25 2014-06-30 13F CLEAN HARBORS COM 184496107 5,336 0 0.00 343 17.47 0.0479
2014-04-14 2014-03-31 13F CLEAN HARBORS COM 184496107 5,336 0 0.00 292 -8.75 0.0428
2014-01-22 2013-12-31 13F CLEAN HARBORS COM 184496107 5,336 0 0.00 320 2.24 0.0484
2013-10-16 2013-09-30 13F CLEAN HARBORS COM 184496107 5,336 0 0.00 313 15.93 0.0524
2013-07-10 2013-06-30 13F CLEAN HARBORS COM 184496107 5,336 5,336 270 0.0493
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.