Clean Harbors, Inc.
MX ˙ BMV ˙ US1844961078
SecurityMX:CLH1 / Clean Harbors, Inc.
InstitutionCitigroup Inc
Latest Disclosed Ownership60,506 shares
Latest Disclosed Value $ 17,348,885
Citigroup Inc reports 21.64% decrease in ownership of CLH1 / Clean Harbors, Inc.

On May 11, 2026 - Citigroup Inc filed a 13F-HR form disclosing ownership of 60,506 shares of Clean Harbors, Inc. (MX:CLH1) valued at $17,348,885 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 77,219 shares of Clean Harbors, Inc.. This represents a change in shares of -21.64% 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)
2026-05-11 2026-03-31 13F CLEAN HARBORS COM 184496107 60,506 -16,713 -21.64 17,349 -4.19 0.0074
2026-02-13 2025-12-31 13F CLEAN HARBORS COM 184496107 77,219 -170,933 -68.88 18,106 -68.58 0.0080
2025-11-10 2025-09-30 13F CLEAN HARBORS COM 184496107 248,152 1,655 0.67 57,626 1.12 0.0257
2025-08-11 2025-06-30 13F CLEAN HARBORS COM 184496107 246,497 -16,855 -6.40 56,985 9.78 0.0280
2025-05-12 2025-03-31 13F CLEAN HARBORS COM 184496107 263,352 70,691 36.69 51,907 17.07 0.0265
2025-02-12 2024-12-31 13F CLEAN HARBORS COM 184496107 192,661 -40,958 -17.53 44,339 -21.48 0.0263
2024-11-12 2024-09-30 13F CLEAN HARBORS COM 184496107 233,619 12,878 5.83 56,468 13.12 0.0327
2024-08-12 2024-06-30 13F CLEAN HARBORS COM 184496107 220,741 1,963 0.90 49,921 13.35 0.0320
2024-05-10 2024-03-31 13F CLEAN HARBORS COM 184496107 218,778 -993 -0.45 44,042 14.84 0.0289
2024-02-09 2023-12-31 13F CLEAN HARBORS COM 184496107 219,771 -2,935 -1.32 38,352 2.90 0.0270
2023-12-06 2023-09-30 13F/A-1 CLEAN HARBORS COM 184496107 222,706 -4,677 -2.06 37,272 -0.31 0.0279
2023-11-09 2023-09-30 13F CLEAN HARBORS COM 184496107 222,706 -4,677 37,272 0.0111
2023-08-10 2023-06-30 13F CLEAN HARBORS COM 184496107 227,383 -10,869 -4.56 37,389 10.08 0.0245
2023-05-11 2023-03-31 13F CLEAN HARBORS COM 184496107 238,252 -13,696 -5.44 33,965 18.13 0.0238
2023-02-09 2022-12-31 13F CLEAN HARBORS COM 184496107 251,948 -15,881 -5.93 28,752 -2.39 0.0229
2022-11-10 2022-09-30 13F CLEAN HARBORS COM 184496107 267,829 -59,692 -18.23 29,456 2.58 0.0211
2022-08-10 2022-06-30 13F CLEAN HARBORS COM 184496107 327,521 -71,278 -17.87 28,714 -35.51 0.0214
2022-05-12 2022-03-31 13F CLEAN HARBORS COM 184496107 398,799 2,924 0.74 44,522 12.73 0.0271
2022-02-10 2021-12-31 13F CLEAN HARBORS COM 184496107 395,875 -16,030 -3.89 39,496 -7.69 0.0212
2021-11-10 2021-09-30 13F CLEAN HARBORS COM 184496107 411,905 -28,022 -6.37 42,784 4.41 0.0253
2021-08-10 2021-06-30 13F CLEAN HARBORS COM 184496107 439,927 77,359 21.34 40,975 34.45 0.0247
2021-05-13 2021-03-31 13F CLEAN HARBORS COM 184496107 362,568 129,905 55.83 30,477 72.15 0.0197
2021-02-11 2020-12-31 13F CLEAN HARBORS COM 184496107 232,663 71,053 43.97 17,704 95.54 0.0105
2020-11-12 2020-09-30 13F CLEAN HARBORS COM 184496107 161,610 52,264 47.80 9,054 38.04 0.0059
2020-08-12 2020-06-30 13F CLEAN HARBORS COM 184496107 109,346 101,616 1,314.57 6,559 1,552.14 0.0051
2020-05-12 2020-03-31 13F CLEAN HARBORS COM 184496107 7,730 1,208 18.52 397 -28.98 0.0004
2020-02-12 2019-12-31 13F CLEAN HARBORS COM 184496107 6,522 -2,194 -25.17 559 -16.94 0.0004
2019-11-08 2019-09-30 13F CLEAN HARBORS COM 184496107 8,716 -12,558 -59.03 673 -55.52 0.0005
2019-08-12 2019-06-30 13F CLEAN HARBORS COM 184496107 21,274 17,167 417.99 1,513 414.63 0.0012
2019-05-13 2019-03-31 13F CLEAN HARBORS COM 184496107 4,107 1,533 59.56 294 131.50 0.0003
2019-02-12 2018-12-31 13F CLEAN HARBORS COM 184496107 2,574 -11,633 -81.88 127 -87.51 0.0001
2018-11-13 2018-09-30 13F CLEAN HARBORS COM 184496107 14,207 14,160 30,127.66 1,017 33,800.00 0.0009
2018-08-10 2018-06-30 13F CLEAN HARBORS COM 184496107 47 24 104.35 3 200.00 0.0000
2018-05-11 2018-03-31 13F CLEAN HARBORS COM 184496107 23 -751 -97.03 1 -97.62 0.0000
2018-02-12 2017-12-31 13F CLEAN HARBORS COM 184496107 774 159 25.85 42 20.00 0.0000
2017-11-13 2017-09-30 13F CLEAN HARBORS COM 184496107 615 566 1,155.10 35 1,066.67 0.0000
2017-08-11 2017-06-30 13F CLEAN HARBORS COM 184496107 49 49 3 0.0000
2017-02-10 2016-12-31 13F CLEAN HARBORS COM 184496107 0 -9,486 -100.00 0 -100.00
2016-11-10 2016-09-30 13F CLEAN HARBORS COM 184496107 9,486 9,442 21,459.09 455 22,650.00 0.0004
2016-08-12 2016-06-30 13F CLEAN HARBORS COM 184496107 44 -539 -92.45 2 -92.86 0.0000
2016-05-13 2016-03-31 13F CLEAN HARBORS COM 184496107 583 113 24.04 28 40.00 0.0000
2016-02-12 2015-12-31 13F CLEAN HARBORS COM 184496107 470 138 41.57 20 42.86 0.0000
2015-11-13 2015-09-30 13F CLEAN HARBORS COM 184496107 332 66 24.81 14 0.00 0.0000
2015-08-13 2015-06-30 13F CLEAN HARBORS COM 184496107 266 -176 -39.82 14 -44.00 0.0000
2015-05-14 2015-03-31 13F CLEAN HARBORS COM 184496107 442 -821 -65.00 25 -59.02 0.0000
2015-02-17 2014-12-31 13F CLEAN HARBORS COM 184496107 1,263 431 51.80 61 35.56 0.0001
2014-11-14 2014-09-30 13F CLEAN HARBORS COM 184496107 832 -7,789 -90.35 45 -91.88 0.0000
2014-08-14 2014-06-30 13F CLEAN HARBORS COM 184496107 8,621 -823 -8.71 554 6.95 0.0005
2014-05-15 2014-03-31 13F CLEAN HARBORS COM 184496107 9,444 -24,608 -72.27 518 -74.62 0.0005
2014-02-14 2013-12-31 13F CLEAN HARBORS COM 184496107 34,052 28,552 519.13 2,041 533.85 0.0018
2013-11-14 2013-09-30 13F CLEAN HARBORS COM 184496107 5,500 1,553 39.35 322 61.00 0.0003
2013-08-14 2013-06-30 13F CLEAN HARBORS COM 184496107 3,947 3,947 200 0.0002
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.