CLEAN HARBORS INC

Ticker: CLH CUSIP: 184496107 Class: EQTY

STATE OF WISCONSIN INVESTMENT BOARD's Holding History (CIK: 0000854157)

Note: Option positions (PUT/CALL) are excluded.

Q4 2025

Shares 63,013 Value ($000) $14,775 Avg Close $228.49 Range $201.34 - $248.07

Q3 2025

Shares 80,307 Value ($000) $18,649 Avg Close $236.75 Range $218.46 - $251.43

Q2 2025

Shares 76,167 Value ($000) $17,608 Avg Close $218.92 Range $178.29 - $235.43

Q1 2025

Shares 78,932 Value ($000) $15,557 Avg Close $218.84 Range $186.54 - $247.51

Q4 2024

Shares 77,859 Value ($000) $17,918 Avg Close $248.40 Range $220.10 - $267.11

Q3 2024

Shares 68,701 Value ($000) $16,606 Avg Close $235.10 Range $217.36 - $251.65

Q2 2024

Shares 68,045 Value ($000) $15,388 Avg Close $209.64 Range $189.32 - $231.15

Q1 2024

Shares 67,000 Value ($000) $13,488 Avg Close $179.73 Range $161.39 - $202.58

Q4 2023

Shares 75,746 Value ($000) $13,218 Avg Close $164.14 Range $132.92 - $179.49

Q3 2023

Shares 70,821 Value ($000) $11,853 Avg Close $168.59 Range $160.37 - $178.33

Q2 2023

Shares 74,648 Value ($000) $12,274 Avg Close $146.18 Range $129.70 - $164.80

Q1 2023

Shares 76,997 Value ($000) $10,977 Avg Close $130.22 Range $110.96 - $144.20

Q4 2022

Shares 86,306 Value ($000) $9,849 Avg Close $116.83 Range $109.07 - $125.41

Q3 2022

Shares 89,484 Value ($000) $9,841 Avg Close $107.08 Range $83.56 - $124.49

Q2 2022

Shares 92,768 Value ($000) $8,133 Avg Close $96.49 Range $81.56 - $115.00

Q1 2022

Shares 83,581 Value ($000) $9,331 Avg Close $98.73 Range $87.11 - $113.71

Q4 2021

Shares 6,159 Value ($000) $614 Avg Close $105.37 Range $90.25 - $118.89

Q3 2021

Shares 6,348 Value ($000) $659 Avg Close $98.39 Range $89.03 - $106.90

Q2 2021

Shares 6,045 Value ($000) $563 Avg Close $90.87 Range $83.56 - $96.47

Q1 2021

Shares 6,527 Value ($000) $549 Avg Close $84.13 Range $73.69 - $91.94

Q4 2020

Shares 6,626 Value ($000) $504 Avg Close $67.02 Range $52.22 - $77.16

Q3 2020

Shares 6,896 Value ($000) $386 Avg Close $59.23 Range $52.29 - $67.07

Q2 2020

Shares 6,756 Value ($000) $405 Avg Close $55.73 Range $44.36 - $71.22

Q1 2020

Shares 6,986 Value ($000) $359 Avg Close $73.03 Range $29.45 - $88.40

Q4 2019

Shares 7,296 Value ($000) $626 Avg Close $81.27 Range $71.31 - $88.01

Q3 2019

Shares 7,296 Value ($000) $563 Avg Close $73.96 Range $67.83 - $80.06

Q2 2019

Shares 7,344 Value ($000) $522 Avg Close $69.62 Range $62.54 - $77.24

Q1 2019

Shares 9,610 Value ($000) $687 Avg Close $61.79 Range $48.13 - $72.26

Q4 2018

Shares 9,890 Value ($000) $488 Avg Close $62.29 Range $46.21 - $72.46

Q3 2018

Shares 9,890 Value ($000) $708 Avg Close $63.60 Range $54.90 - $72.50

Q2 2018

Shares 10,110 Value ($000) $562 Avg Close $51.36 Range $44.75 - $56.00

Q1 2018

Shares 10,505 Value ($000) $513 Avg Close $52.41 Range $46.62 - $57.97

Q4 2017

Shares 101,850 Value ($000) $5,520 Avg Close $54.14 Range $51.43 - $58.22

Q3 2017

Shares 101,710 Value ($000) $5,767 Avg Close $54.44 Range $49.63 - $58.28

Q2 2017

Shares 101,457 Value ($000) $5,664 Avg Close $57.50 Range $53.17 - $61.62

Q1 2017

Shares 109,157 Value ($000) $6,071 Avg Close $55.34 Range $52.77 - $59.17

Q4 2016

Shares 127,146 Value ($000) $7,076 Avg Close $50.41 Range $43.03 - $58.23

Q3 2016

Shares 149,020 Value ($000) $7,150 Avg Close $49.57 Range $44.91 - $53.79

Q2 2016

Shares 116,020 Value ($000) $6,046 Avg Close $50.01 Range $46.40 - $54.54

Q1 2016

Shares 122,920 Value ($000) $6,065 Avg Close $43.78 Range $37.09 - $49.97

Q4 2015

Shares 124,680 Value ($000) $5,193 Avg Close $43.45 Range $39.89 - $48.05

Q3 2015

Shares 125,760 Value ($000) $5,530 Avg Close $49.63 Range $43.00 - $54.31

Q2 2015

Shares 126,990 Value ($000) $6,824 Avg Close $55.82 Range $50.65 - $59.29

Q1 2015

Shares 128,140 Value ($000) $7,276 Avg Close $51.78 Range $44.70 - $58.44

Q4 2014

Shares 129,400 Value ($000) $6,218 Avg Close $48.74 Range $43.05 - $53.84

Q3 2014

Shares 144,720 Value ($000) $7,803 Avg Close $58.81 Range $53.66 - $65.53

Q2 2014

Shares 144,380 Value ($000) $9,276 Avg Close $59.46 Range $52.02 - $64.30

Q1 2014

Shares 168,260 Value ($000) $9,219 Avg Close $54.49 Range $44.95 - $60.47

Q4 2013

Shares 193,180 Value ($000) $11,583 Avg Close $57.66 Range $51.77 - $64.12

Q3 2013

Shares 159,510 Value ($000) $9,357 Avg Close $55.80 Range $50.23 - $59.80

Q2 2013

Shares 137,960 Value ($000) $6,971 Avg Close $55.73 Range $50.37 - $61.28

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2025	63,013	$14,775	$228.49	$201.34 - $248.07
Q3 2025	80,307	$18,649	$236.75	$218.46 - $251.43
Q2 2025	76,167	$17,608	$218.92	$178.29 - $235.43
Q1 2025	78,932	$15,557	$218.84	$186.54 - $247.51
Q4 2024	77,859	$17,918	$248.40	$220.10 - $267.11
Q3 2024	68,701	$16,606	$235.10	$217.36 - $251.65
Q2 2024	68,045	$15,388	$209.64	$189.32 - $231.15
Q1 2024	67,000	$13,488	$179.73	$161.39 - $202.58
Q4 2023	75,746	$13,218	$164.14	$132.92 - $179.49
Q3 2023	70,821	$11,853	$168.59	$160.37 - $178.33
Q2 2023	74,648	$12,274	$146.18	$129.70 - $164.80
Q1 2023	76,997	$10,977	$130.22	$110.96 - $144.20
Q4 2022	86,306	$9,849	$116.83	$109.07 - $125.41
Q3 2022	89,484	$9,841	$107.08	$83.56 - $124.49
Q2 2022	92,768	$8,133	$96.49	$81.56 - $115.00
Q1 2022	83,581	$9,331	$98.73	$87.11 - $113.71
Q4 2021	6,159	$614	$105.37	$90.25 - $118.89
Q3 2021	6,348	$659	$98.39	$89.03 - $106.90
Q2 2021	6,045	$563	$90.87	$83.56 - $96.47
Q1 2021	6,527	$549	$84.13	$73.69 - $91.94
Q4 2020	6,626	$504	$67.02	$52.22 - $77.16
Q3 2020	6,896	$386	$59.23	$52.29 - $67.07
Q2 2020	6,756	$405	$55.73	$44.36 - $71.22
Q1 2020	6,986	$359	$73.03	$29.45 - $88.40
Q4 2019	7,296	$626	$81.27	$71.31 - $88.01
Q3 2019	7,296	$563	$73.96	$67.83 - $80.06
Q2 2019	7,344	$522	$69.62	$62.54 - $77.24
Q1 2019	9,610	$687	$61.79	$48.13 - $72.26
Q4 2018	9,890	$488	$62.29	$46.21 - $72.46
Q3 2018	9,890	$708	$63.60	$54.90 - $72.50
Q2 2018	10,110	$562	$51.36	$44.75 - $56.00
Q1 2018	10,505	$513	$52.41	$46.62 - $57.97
Q4 2017	101,850	$5,520	$54.14	$51.43 - $58.22
Q3 2017	101,710	$5,767	$54.44	$49.63 - $58.28
Q2 2017	101,457	$5,664	$57.50	$53.17 - $61.62
Q1 2017	109,157	$6,071	$55.34	$52.77 - $59.17
Q4 2016	127,146	$7,076	$50.41	$43.03 - $58.23
Q3 2016	149,020	$7,150	$49.57	$44.91 - $53.79
Q2 2016	116,020	$6,046	$50.01	$46.40 - $54.54
Q1 2016	122,920	$6,065	$43.78	$37.09 - $49.97
Q4 2015	124,680	$5,193	$43.45	$39.89 - $48.05
Q3 2015	125,760	$5,530	$49.63	$43.00 - $54.31
Q2 2015	126,990	$6,824	$55.82	$50.65 - $59.29
Q1 2015	128,140	$7,276	$51.78	$44.70 - $58.44
Q4 2014	129,400	$6,218	$48.74	$43.05 - $53.84
Q3 2014	144,720	$7,803	$58.81	$53.66 - $65.53
Q2 2014	144,380	$9,276	$59.46	$52.02 - $64.30
Q1 2014	168,260	$9,219	$54.49	$44.95 - $60.47
Q4 2013	193,180	$11,583	$57.66	$51.77 - $64.12
Q3 2013	159,510	$9,357	$55.80	$50.23 - $59.80
Q2 2013	137,960	$6,971	$55.73	$50.37 - $61.28