Clean Harbors, Inc.
US ˙ NYSE ˙ US1844961078

SecurityCLH / Clean Harbors, Inc.
InstitutionAmalgamated Bank
Latest Disclosed Ownership22,717 shares
Latest Disclosed Value $ 6,514
Amalgamated Bank reports 1.92% increase in ownership of CLH / Clean Harbors, Inc.

On May 8, 2026 - Amalgamated Bank filed a 13F-HR form disclosing ownership of 22,717 shares of Clean Harbors, Inc. (US:CLH) valued at $6,513,645 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 5, 2026 disclosing 22,289 shares of Clean Harbors, Inc.. This represents a change in shares of 1.92% during the quarter. The current value of the position is $6,511,374 USD.

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)
2026-05-08 2026-03-31 13F CLEAN HARBORS COM 184496107 22,717 428 1.92 7 20.00 0.0498
2026-02-05 2025-12-31 13F CLEAN HARBORS COM 184496107 22,289 -805 -3.49 5 0.00 0.0377
2025-10-29 2025-09-30 13F CLEAN HARBORS COM 184496107 23,094 -44 -0.19 5 0.00 0.0383
2025-08-04 2025-06-30 13F CLEAN HARBORS COM 184496107 23,138 -114 -0.49 5 25.00 0.0413
2025-04-25 2025-03-31 13F CLEAN HARBORS COM 184496107 23,252 -1,011 -4.17 5 -20.00 0.0392
2025-02-04 2024-12-31 13F CLEAN HARBORS COM 184496107 24,263 73 0.30 6 0.00 0.0458
2024-10-30 2024-09-30 13F CLEAN HARBORS COM 184496107 24,190 -1,251 -4.92 6 0.00 0.0482
2024-08-12 2024-06-30 13F CLEAN HARBORS COM 184496107 25,441 -5,884 -18.78 6 -16.67 0.0490
2024-04-23 2024-03-31 13F CLEAN HARBORS COM 184496107 31,325 -5,174 -14.18 6 0.00 0.0539
2024-02-06 2023-12-31 13F CLEAN HARBORS COM 184496107 36,499 -1,507 -3.97 6 0.00 0.0508
2023-11-08 2023-09-30 13F CLEAN HARBORS COM 184496107 38,006 3,661 10.66 6 20.00 0.0542
2023-08-11 2023-06-30 13F CLEAN HARBORS COM 184496107 34,345 -360 -1.04 6 25.00 0.0457
2023-05-02 2023-03-31 13F CLEAN HARBORS COM 184496107 34,705 -9,534 -21.55 5 -20.00 0.0422
2023-02-10 2022-12-31 13F CLEAN HARBORS COM 184496107 44,239 8,067 22.30 5 -99.87 0.0450
2022-11-09 2022-09-30 13F CLEAN HARBORS COM 184496107 36,172 -1,823 -4.80 3,978 19.42 0.0384
2022-08-15 2022-06-30 13F CLEAN HARBORS COM 184496107 37,995 3,270 9.42 3,331 -14.08 0.0311
2022-08-25 2022-03-31 13F/A-1 CLEAN HARBORS COM 184496107 34,725 -1,269 -3.53 3,877 7.96 0.0301
2022-06-30 2022-03-31 13F CLEAN HARBORS COM 184496107 34,725 -1,269 3,877 0.0308
2022-02-15 2021-12-31 13F/A-1 CLEAN HARBORS COM 184496107 35,994 -2,306 -6.02 3,591 -9.73 0.0265
2022-02-15 2021-12-31 13F CLEAN HARBORS COM 184496107 35,994 -2,306 3,591 0.0265
2021-10-29 2021-09-30 13F CLEAN HARBORS COM 184496107 38,300 -3,791 -9.01 3,978 1.48 0.0336
2021-08-16 2021-06-30 13F CLEAN HARBORS COM 184496107 42,091 35,679 556.44 3,920 627.27 0.0314
2021-05-13 2021-03-31 13F CLEAN HARBORS COM 184496107 6,412 -432 -6.31 539 3.45 0.0202
2021-02-12 2020-12-31 13F CLEAN HARBORS COM 184496107 6,844 16 0.23 521 36.03 0.0197
2020-10-30 2020-09-30 13F CLEAN HARBORS COM 184496107 6,828 -32 -0.47 383 -6.81 0.0167
2020-08-10 2020-06-30 13F CLEAN HARBORS COM 184496107 6,860 -4,749 -40.91 411 -31.04 0.0190
2020-05-13 2020-03-31 13F CLEAN HARBORS COM 184496107 11,609 -203 -1.72 596 -41.16 0.0146
2020-02-13 2019-12-31 13F CLEAN HARBORS COM 184496107 11,812 1,189 11.19 1,013 23.54 0.0186
2019-11-13 2019-09-30 13F CLEAN HARBORS COM 184496107 10,623 -176 -1.63 820 6.77 0.0172
2019-08-14 2019-06-30 13F CLEAN HARBORS COM 184496107 10,799 464 4.49 768 3.92 0.0179
2019-05-15 2019-03-31 13F CLEAN HARBORS COM 184496107 10,335 220 2.17 739 48.10 0.0179
2019-02-15 2018-12-31 13F CLEAN HARBORS COM 184496107 10,115 -107 -1.05 499 -31.83 0.0141
2018-11-14 2018-09-30 13F CLEAN HARBORS COM 184496107 10,222 -89 -0.86 732 27.75 0.0181
2018-07-18 2018-06-30 13F CLEAN HARBORS COM 184496107 10,311 -1,031 -9.09 573 3.43 0.0140
2018-05-22 2018-03-31 13F CLEAN HARBORS COM 184496107 11,342 485 4.47 554 -5.78 0.0147
2018-02-13 2017-12-31 13F CLEAN HARBORS COM 184496107 10,857 569 5.53 588 0.86 0.0159
2017-11-09 2017-09-30 13F CLEAN HARBORS COM 184496107 10,288 -289 -2.73 583 -1.35 0.0182
2017-08-10 2017-06-30 13F CLEAN HARBORS COM 184496107 10,577 2,279 27.46 591 27.92 0.0194
2017-05-12 2017-03-31 13F CLEAN HARBORS COM 184496107 8,298 83 1.01 462 1.09 0.0230
2017-02-14 2016-12-31 13F CLEAN HARBORS COM 184496107 8,215 941 12.94 457 30.95 0.0207
2016-11-15 2016-09-30 13F/A-1 CLEAN HARBORS COM 184496107 7,274 7 0.10 349 -2.79 0.0203
2016-08-16 2016-06-30 13F CLEAN HARBORS COM 184496107 7,267 122 1.71 359 1.70 0.0208
2016-05-11 2016-03-31 13F CLEAN HARBORS COM 184496107 7,145 575 8.75 353 28.83 0.0344
2016-02-10 2015-12-31 13F CLEAN HARBORS COM 184496107 6,570 -481 -6.82 274 -11.61 0.0338
2015-11-04 2015-09-30 13F CLEAN HARBORS COM 184496107 7,051 110 1.58 310 -16.89 0.0325
2015-07-10 2015-06-30 13F CLEAN HARBORS COM 184496107 6,941 1,235 21.64 373 15.12 0.0366
2015-04-22 2015-03-31 13F CLEAN HARBORS COM 184496107 5,706 5,706 0.00 324 0.0396
2015-01-29 2014-12-31 13F CLEAN HARBORS COM 184496107 0 -5,453 -100.00 0 -100.00
2014-11-14 2014-09-30 13F CLEAN HARBORS COM 184496107 5,453 67 1.24 294 -15.03 0.0438
2014-08-11 2014-06-30 13F CLEAN HARBORS INC COM 184496107 5,386 -1,677 -23.74 346 -10.59 0.0522
2014-05-12 2014-03-31 13F CLEAN HARBORS INC COM 184496107 7,063 -50 -0.70 387 -9.15 0.0667
2014-02-13 2013-12-31 13F CLEAN HARBORS INC COM 184496107 7,113 7,113 426 0.0724
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.