OAM
CLH icon

Oberweis Asset Management’s Clean Harbors CLH Stock Holding History

Oberweis Asset Management’s Portfolio CLH Stock Details CLH Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$41.4M Buy
144,355
+27,485
+24% +$7.5M 1.22% 11
2025
Q4 		$27.4M Buy
116,870
+100
+0.1% +$22.8K 1% 21
2025
Q3 		$27.1M Sell
116,770
-530
-0.5% -$125K 1.04% 18
2025
Q2 		$27.1M Buy
117,300
+6,980
+6% +$1.53M 1.18% 17
2025
Q1 		$21.7M Buy
110,320
+7,890
+8% +$1.73M 1.08% 24
2024
Q4 		$23.6M Sell
102,430
-2,940
-3% -$730K 1.11% 13
2024
Q3 		$25.5M Buy
105,370
+2,125
+2% +$500K 1.31% 10
2024
Q2 		$23.3M Buy
103,245
+21,950
+27% +$4.6M 1.43% 10
2024
Q1 		$16.4M Buy
81,295
+24,240
+42% +$4.36M 1.18% 13
2023
Q4 		$9.96M Buy
57,055
+11,640
+26% +$1.91M 0.93% 18
2023
Q3 		$7.6M Buy
45,415
+310
+0.7% +$52.3K 0.81% 22
2023
Q2 		$7.42M Sell
45,105
-5,730
-11% -$838K 0.9% 18
2023
Q1 		$7.25M Buy
50,835
+2,500
+5% +$326K 1.12% 13
2022
Q4 		$5.52M Buy
48,335
+25,660
+113% +$3M 1.17% 16
2022
Q3 		$2.49M Buy
22,675
+10,785
+91% +$1.15M 0.58% 32
2022
Q2 		$1.04M Buy
11,890
+6,990
+143% +$674K 0.26% 87
2022
Q1 		$547K Buy
4,900
+2,000
+69% +$197K 0.11% 110
2021
Q4 		$289K Hold
2,900
– – 0.05% 137
2021
Q3 		$301K Sell
2,900
-700
-19% -$68.9K 0.06% 131
2021
Q2 		$335K Hold
3,600
– – 0.07% 121
2021
Q1 		$303K Sell
3,600
-400
-10% -$33.6K 0.06% 132
2020
Q4 		$304K Buy
+4,000
New +$268K 0.08% 113
2019
Q2 		– Sell
-3,600
Closed -$258K – 196
2019
Q1 		$258K Buy
+3,600
New +$222K 0.05% 180

Other funds holding CLH

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
Wellington Management Group
Wellington Management Group Boston, Massachusetts $535B AUM 26.23% 1-Year Est. Return
Janus Henderson Group
Janus Henderson Group London, United Kingdom $209B AUM 37.72% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
Fidelity Investments
Fidelity Investments Boston, Massachusetts $1.9T AUM 41.92% 1-Year Est. Return
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
LPC
Lone Pine Capital Greenwich, Connecticut $12.5B AUM 54.4% 1-Year Est. Return
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
DCP
D1 Capital Partners New York $11.2B AUM 15.78% 1-Year Est. Return
Pictet Asset Management
Pictet Asset Management Carouge, Switzerland $94.8B AUM 24.11% 1-Year Est. Return

Oberweis Asset Management's CLH Position: Q1 2026 in Review

Oberweis Asset Management increased its Clean Harbors (CLH) stake by 24% in Q1 2026, buying an estimated $7.5M and bringing the position to 144,355 shares worth $41.4M. The position accounts for 1.22% of the portfolio, ranked #11.

Oberweis Asset Management first reported a position in CLH in Q1 2019 and has held it in 23 quarters since. 623 funds tracked by Wall St. Rank hold CLH as of Q1 2026.

  • Oberweis Asset Management held 144,355 shares of Clean Harbors worth $41.4M as of Q1 2026.
  • Oberweis Asset Management bought 27,485 Clean Harbors shares in Q1 2026, an estimated $7.5M.
  • Clean Harbors made up 1.22% of Oberweis Asset Management's portfolio in Q1 2026, its #11 holding.
  • Oberweis Asset Management first reported a position in Clean Harbors in Q1 2019 and has held it in 23 quarters since.
  • 623 funds tracked by Wall St. Rank held Clean Harbors as of Q1 2026.

Based on Oberweis Asset Management's 13F filing for Q1 2026, filed 15 May 2026.