Clean Harbors, Inc.
MX ˙ BMV ˙ US1844961078
SecurityMX:CLH1 / Clean Harbors, Inc.
InstitutionTwo Sigma Advisers, Lp
Latest Disclosed Ownership321,500 shares
Latest Disclosed Value $ 75,385,320
Two Sigma Advisers, Lp reports 35.71% increase in ownership of CLH1 / Clean Harbors, Inc.

On February 17, 2026 - Two Sigma Advisers, Lp filed a 13F-HR form disclosing ownership of 321,500 shares of Clean Harbors, Inc. (MX:CLH1) valued at $75,385,320 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 14, 2025 disclosing 236,900 shares of Clean Harbors, Inc.. This represents a change in shares of 35.71% 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)
2026-02-17 2025-12-31 13F CLEAN HARBORS COM 184496107 321,500 84,600 35.71 75,385 37.03 0.1466
2025-11-14 2025-09-30 13F CLEAN HARBORS COM 184496107 236,900 183,700 345.30 55,013 347.32 0.1101
2025-08-14 2025-06-30 13F CLEAN HARBORS COM 184496107 53,200 12,000 29.13 12,299 51.45 0.0252
2025-05-15 2025-03-31 13F CLEAN HARBORS COM 184496107 41,200 2,000 5.10 8,121 -9.99 0.0183
2025-02-14 2024-12-31 13F CLEAN HARBORS COM 184496107 39,200 13,307 51.39 9,021 44.15 0.0209
2024-11-14 2024-09-30 13F CLEAN HARBORS COM 184496107 25,893 22,993 792.86 6,259 855.42 0.0147
2024-08-14 2024-06-30 13F CLEAN HARBORS COM 184496107 2,900 -3,000 -50.85 656 -44.82 0.0015
2024-05-15 2024-03-31 13F CLEAN HARBORS COM 184496107 5,900 5,900 1,188 0.0028
2023-08-14 2023-06-30 13F CLEAN HARBORS COM 184496107 0 -44,700 -100.00 0 -100.00
2023-05-15 2023-03-31 13F CLEAN HARBORS COM 184496107 44,700 -27,500 -38.09 6,372 -22.66 0.0164
2023-02-14 2022-12-31 13F CLEAN HARBORS COM 184496107 72,200 55,500 332.34 8,239 348.50 0.0230
2022-11-14 2022-09-30 13F CLEAN HARBORS COM 184496107 16,700 -1,000 -5.65 1,837 18.36 0.0053
2022-08-15 2022-06-30 13F CLEAN HARBORS COM 184496107 17,700 -19,000 -51.77 1,552 -62.12 0.0044
2022-05-16 2022-03-31 13F CLEAN HARBORS COM 184496107 36,700 2,600 7.62 4,097 20.43 0.0109
2022-02-14 2021-12-31 13F CLEAN HARBORS COM 184496107 34,100 3,400 11.07 3,402 6.68 0.0085
2021-11-15 2021-09-30 13F CLEAN HARBORS COM 184496107 30,700 -1,200 -3.76 3,189 7.34 0.0083
2021-08-16 2021-06-30 13F CLEAN HARBORS COM 184496107 31,900 -31,400 -49.61 2,971 -44.16 0.0078
2021-05-17 2021-03-31 13F CLEAN HARBORS COM 184496107 63,300 -46,200 -42.19 5,321 -36.15 0.0146
2021-02-16 2020-12-31 13F CLEAN HARBORS COM 184496107 109,500 23,600 27.47 8,333 73.14 0.0223
2020-11-16 2020-09-30 13F CLEAN HARBORS COM 184496107 85,900 -3,400 -3.81 4,813 -10.14 0.0137
2020-09-15 2020-06-30 13F/A-1 CLEAN HARBORS COM 184496107 89,300 7,400 9.04 5,356 27.37 0.0157
2020-08-14 2020-06-30 13F CLEAN HARBORS COM 184496107 89,300 7,400 5,356 15,477.0612
2020-05-15 2020-03-31 13F CLEAN HARBORS COM 184496107 81,900 3,400 4.33 4,205 -37.53 0.0161
2020-02-14 2019-12-31 13F CLEAN HARBORS COM 184496107 78,500 1,300 1.68 6,731 12.94 0.0156
2019-11-14 2019-09-30 13F CLEAN HARBORS COM 184496107 77,200 -6,027 -7.24 5,960 0.73 0.0146
2019-08-14 2019-06-30 13F CLEAN HARBORS COM 184496107 83,227 -76,900 -48.02 5,917 -48.34 0.0147
2019-05-15 2019-03-31 13F CLEAN HARBORS COM 184496107 160,127 26,700 20.01 11,454 73.94 0.0289
2019-02-14 2018-12-31 13F CLEAN HARBORS COM 184496107 133,427 35,500 36.25 6,585 -6.06 0.0180
2018-11-14 2018-09-30 13F CLEAN HARBORS COM 184496107 97,927 -8,600 -8.07 7,010 18.45 0.0171
2018-08-14 2018-06-30 13F CLEAN HARBORS COM 184496107 106,527 300 0.28 5,918 14.14 0.0159
2018-05-15 2018-03-31 13F CLEAN HARBORS COM 184496107 106,227 5,400 5.36 5,185 -5.12 0.0141
2018-02-14 2017-12-31 13F CLEAN HARBORS COM 184496107 100,827 60,027 147.12 5,465 136.27 0.0147
2017-11-14 2017-09-30 13F CLEAN HARBORS COM 184496107 40,800 21,500 111.40 2,313 114.56 0.0066
2017-08-14 2017-06-30 13F CLEAN HARBORS COM 184496107 19,300 -4,027 -17.26 1,078 -16.89 0.0036
2017-05-15 2017-03-31 13F CLEAN HARBORS COM 184496107 23,327 -13,300 -36.31 1,297 -36.36 0.0043
2017-02-14 2016-12-31 13F CLEAN HARBORS COM 184496107 36,627 5,327 17.02 2,038 35.69 0.0078
2016-11-14 2016-09-30 13F CLEAN HARBORS COM 184496107 31,300 1,573 5.29 1,502 -3.03 0.0064
2016-08-15 2016-06-30 13F CLEAN HARBORS COM 184496107 29,727 17,100 135.42 1,549 148.64 0.0079
2016-05-16 2016-03-31 13F CLEAN HARBORS COM 184496107 12,627 7,400 141.57 623 185.78 0.0035
2016-02-16 2015-12-31 13F CLEAN HARBORS COM 184496107 5,227 5,227 0.00 218 0.0013
2015-11-16 2015-09-30 13F CLEAN HARBORS COM 184496107 0 -7,627 -100.00 0 -100.00
2016-02-09 2015-06-30 13F/A-2 CLEAN HARBORS COM 184496107 7,627 -10,600 -58.16 410 -60.39 0.0942
2016-02-09 2015-03-31 13F/A-1 CLEAN HARBORS COM 184496107 18,227 12,800 235.86 1,035 296.55 0.0079
2015-05-15 2015-03-31 13F CLEAN HARBORS COM 184496107 17,227 979
2016-02-09 2014-12-31 13F/A-1 CLEAN HARBORS COM 184496107 5,427 600 12.43 261 0.38 0.0021
2015-02-17 2014-12-31 13F CLEAN HARBORS COM 184496107 5,427 261
2016-02-09 2014-09-30 13F/A-1 CLEAN HARBORS COM 184496107 4,827 4,827 19.87 260 9.70 0.0020
2014-11-14 2014-09-30 13F CLEAN HARBORS COM 184496107 4,827 261
2014-02-14 2013-12-31 13F Clean Harbors Common Stock 184496107 0 -4,027 -100.00 0 -100.00
2013-11-14 2013-09-30 13F Clean Harbors Common Stock 184496107 4,027 4,027 237 0.0028
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.