Clean Harbors, Inc.
US ˙ NYSE ˙ US1844961078

SecurityCLH / Clean Harbors, Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership608,709 shares
Latest Disclosed Value $ 174,515,664
Dimensional Fund Advisors Lp reports 1.76% decrease in ownership of CLH / Clean Harbors, Inc.

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 608,709 shares of Clean Harbors, Inc. (US:CLH) valued at $174,535,132 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 619,612 shares of Clean Harbors, Inc.. This represents a change in shares of -1.76% during the quarter. The current value of the position is $174,474,261 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.

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)
2026-05-07 2026-03-31 13F CLEAN HARBORS COM 184496107 608,709 -10,903 -1.76 174,516 20.11 0.0078
2026-02-12 2025-12-31 13F CLEAN HARBORS COM 184496107 619,612 4,768 0.78 145,297 1.76 0.0305
2025-11-12 2025-09-30 13F CLEAN HARBORS COM 184496107 614,844 -41,084 -6.26 142,782 -5.84 0.0306
2025-08-12 2025-06-30 13F CLEAN HARBORS COM 184496107 655,928 -2,637 -0.40 151,640 16.83 0.0351
2025-05-13 2025-03-31 13F CLEAN HARBORS COM 184496107 658,565 -18,329 -2.71 129,795 -16.68 0.0323
2025-02-13 2024-12-31 13F CLEAN HARBORS COM 184496107 676,894 15,888 2.40 155,784 -2.49 0.0374
2024-11-07 2024-09-30 13F CLEAN HARBORS COM 184496107 661,006 -46,752 -6.61 159,759 -0.20 0.0388
2024-08-09 2024-06-30 13F CLEAN HARBORS COM 184496107 707,758 -68,572 -8.83 160,072 2.43 0.0418
2024-05-10 2024-03-31 13F CLEAN HARBORS COM 184496107 776,330 -23,207 -2.90 156,283 12.00 0.0423
2024-02-07 2023-12-31 13F CLEAN HARBORS COM 184496107 799,537 -114,528 -12.53 139,532 -8.79 0.0407
2023-11-09 2023-09-30 13F CLEAN HARBORS COM 184496107 914,065 -157,247 -14.68 152,982 -13.15 0.0502
2023-08-09 2023-06-30 13F CLEAN HARBORS COM 184496107 1,071,312 -219,383 -17.00 176,150 -4.26 0.0561
2023-05-12 2023-03-31 13F CLEAN HARBORS COM 184496107 1,290,695 -269,339 -17.26 183,995 103,267.42 0.0620
2023-02-09 2022-12-31 13F CLEAN HARBORS COM 184496107 1,560,034 -95,948 -5.79 178 -99.90 0.0526
2022-11-10 2022-09-30 13F CLEAN HARBORS COM 184496107 1,655,982 21,572 1.32 182,125 27.11 0.0699
2022-08-12 2022-06-30 13F CLEAN HARBORS COM 184496107 1,634,410 -37,755 -2.26 143,287 -23.25 0.0514
2022-05-13 2022-03-31 13F CLEAN HARBORS COM 184496107 1,672,165 -352 -0.02 186,684 11.88 0.0575
2022-02-09 2021-12-31 13F CLEAN HARBORS COM 184496107 1,672,517 -21,939 -1.29 166,859 -5.20 0.0504
2021-11-12 2021-09-30 13F CLEAN HARBORS COM 184496107 1,694,456 -181 -0.01 176,010 11.52 0.0567
2021-08-12 2021-06-30 13F CLEAN HARBORS COM 184496107 1,694,637 -140,086 -7.64 157,829 2.33 0.0500
2021-05-14 2021-03-31 13F CLEAN HARBORS COM 184496107 1,834,723 -11,871 -0.64 154,230 9.75 0.0510
2021-03-08 2020-12-31 13F/A-2 CLEAN HARBORS COM 184496107 1,846,594 -19,031 -1.02 140,523 34.43 0.0507
2021-02-11 2020-12-31 13F CLEAN HARBORS COM 184496107 1,846,594 -19,031 140,523 50,749.4384
2020-11-12 2020-09-30 13F CLEAN HARBORS COM 184496107 1,865,625 -6,883 -0.37 104,530 -6.93 0.0443
2020-08-13 2020-06-30 13F CLEAN HARBORS COM 184496107 1,872,508 75,461 4.20 112,311 21.74 0.0494
2020-05-14 2020-03-31 13F CLEAN HARBORS COM 184496107 1,797,047 -1,407 -0.08 92,254 -40.18 0.0481
2020-02-14 2019-12-31 13F CLEAN HARBORS COM 184496107 1,798,454 -114,370 -5.98 154,219 4.44 0.0562
2019-11-12 2019-09-30 13F CLEAN HARBORS COM 184496107 1,912,824 -64,210 -3.25 147,666 5.05 0.0574
2019-08-13 2019-06-30 13F CLEAN HARBORS COM 184496107 1,977,034 7,540 0.38 140,564 -0.22 0.0546
2019-08-12 2019-03-31 13F/A-2 CLEAN HARBORS COM 184496107 1,969,494 -8,025 -0.41 140,877 44.36 0.0561
2019-05-10 2019-03-31 13F CLEAN HARBORS COM 184496107 1,969,494 -8,025 140,877
2019-02-26 2018-12-31 13F/A-1 CLEAN HARBORS COM 184496107 1,977,519 -38,721 -1.92 97,589 -32.38 0.0442
2019-02-13 2018-12-31 13F CLEAN HARBORS COM 184496107 1,977,519 -38,721 97,589
2018-11-13 2018-09-30 13F CLEAN HARBORS COM 184496107 2,016,240 26,729 1.34 144,321 30.59 0.0549
2018-08-10 2018-06-30 13F CLEAN HARBORS COM 184496107 1,989,511 51,695 2.67 110,515 16.84 0.0441
2018-05-11 2018-03-31 13F CLEAN HARBORS COM 184496107 1,937,816 82,370 4.44 94,585 -5.95 0.0394
2018-02-12 2017-12-31 13F CLEAN HARBORS COM 184496107 1,855,446 -47,818 -2.51 100,564 -6.81 0.0417
2017-11-13 2017-09-30 13F CLEAN HARBORS COM 184496107 1,903,264 15,654 0.83 107,915 2.40 0.0472
2017-08-11 2017-06-30 13F CLEAN HARBORS COM 184496107 1,887,610 8,095 0.43 105,383 0.81 0.0487
2017-05-12 2017-03-31 13F CLEAN HARBORS COM 184496107 1,879,515 60,435 3.32 104,537 3.26 0.0500
2017-02-09 2016-12-31 13F CLEAN HARBORS COM 184496107 1,819,080 74,933 4.30 101,232 20.97 0.0506
2016-11-10 2016-09-30 13F CLEAN HARBORS COM 184496107 1,744,147 26,337 1.53 83,684 -6.51 0.0452
2016-08-09 2016-06-30 13F CLEAN HARBORS COM 184496107 1,717,810 186,113 12.15 89,513 18.44 0.0515
2016-05-13 2016-03-31 13F CLEAN HARBORS COM 184496107 1,531,697 219,738 16.75 75,575 38.30 0.0452
2016-02-10 2015-12-31 13F CLEAN HARBORS COM 184496107 1,311,959 300,243 29.68 54,645 22.84 0.0341
2015-11-13 2015-09-30 13F CLEAN HARBORS COM 184496107 1,011,716 319,622 46.18 44,484 19.60 0.0292
2015-08-14 2015-06-30 13F CLEAN HARBORS COM 184496107 692,094 130,971 23.34 37,193 16.74 0.0228
2015-05-14 2015-03-31 13F CLEAN HARBORS COM 184496107 561,123 23,293 4.33 31,859 23.27 0.0201
2015-02-06 2014-12-31 13F CLEAN HARBORS COM 184496107 537,830 143,066 36.24 25,845 21.41 0.0170
2014-11-13 2014-09-30 13F CLEAN HARBORS COM 184496107 394,764 86,111 27.90 21,287 7.35 0.0151
2014-08-08 2014-06-30 13F CLEAN HARBORS COM 184496107 308,653 53,539 20.99 19,830 41.86 0.0138
2014-05-14 2014-03-31 13F CLEAN HARBORS COM 184496107 255,114 35,890 16.37 13,979 6.36 0.0104
2014-02-12 2013-12-31 13F CLEAN HARBORS COM 184496107 219,224 43,271 24.59 13,143 27.38 0.0102
2013-11-13 2013-09-30 13F CLEAN HARBORS COM 184496107 175,953 12,375 7.57 10,318 24.81 0.0089
2013-08-15 2013-06-30 13F CLEAN HARBORS COM 184496107 163,578 163,578 8,267 0.0078
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.