William Blair Investment Management LLC Invests $125.24 Million in Clean Harbors, Inc. $CLH

Posted by Stanley Muller on Aug 22nd, 2026

William Blair Investment Management LLC purchased a new stake in shares of Clean Harbors, Inc. (NYSE:CLH – Free Report) in the second quarter, according to its most recent filing with the Securities and Exchange Commission. The institutional investor purchased 419,210 shares of the business services provider’s stock, valued at approximately $125,239,000. William Blair Investment Management LLC owned about 0.79% of Clean Harbors as of its most recent SEC filing.

Several other institutional investors have also added to or reduced their stakes in CLH. Fideuram Intesa Sanpaolo Private Banking S.P.A. boosted its holdings in shares of Clean Harbors by 94.4% during the first quarter. Fideuram Intesa Sanpaolo Private Banking S.P.A. now owns 16,997 shares of the business services provider’s stock worth $4,874,000 after purchasing an additional 8,252 shares during the period. Jefferies Financial Group Inc. bought a new stake in shares of Clean Harbors in the fourth quarter worth about $938,000. Swedbank AB increased its holdings in Clean Harbors by 7.1% during the 4th quarter. Swedbank AB now owns 150,000 shares of the business services provider’s stock valued at $35,172,000 after purchasing an additional 10,000 shares during the period. New York Life Investment Management LLC bought a new position in Clean Harbors during the 4th quarter valued at approximately $1,065,000. Finally, Janus Henderson Group PLC lifted its holdings in Clean Harbors by 10.0% in the 4th quarter. Janus Henderson Group PLC now owns 2,376,088 shares of the business services provider’s stock worth $557,146,000 after buying an additional 215,659 shares during the period. Hedge funds and other institutional investors own 90.43% of the company’s stock.

Clean Harbors Price Performance

Shares of CLH stock opened at $316.64 on Friday. The business’s fifty day moving average is $305.16 and its 200 day moving average is $294.56. The company has a quick ratio of 1.80, a current ratio of 2.13 and a debt-to-equity ratio of 0.94. The stock has a market cap of $16.72 billion, a price-to-earnings ratio of 38.43, a PEG ratio of 2.08 and a beta of 0.86. Clean Harbors, Inc. has a twelve month low of $201.34 and a twelve month high of $335.94.

Clean Harbors (NYSE:CLH – Get Free Report) last announced its quarterly earnings data on Wednesday, July 29th. The business services provider reported $3.22 EPS for the quarter, beating the consensus estimate of $2.81 by $0.41. Clean Harbors had a return on equity of 15.65% and a net margin of 7.03%.The business had revenue of $1.74 billion during the quarter, compared to analyst estimates of $1.64 billion. During the same quarter last year, the firm posted $2.36 earnings per share. The company’s revenue for the quarter was up 11.9% on a year-over-year basis. Research analysts expect that Clean Harbors, Inc. will post 9.72 EPS for the current fiscal year.

Wall Street Analyst Weigh In

Several research firms have recently issued reports on CLH. Oppenheimer reissued an “outperform” rating and set a $350.00 target price on shares of Clean Harbors in a research note on Thursday, July 30th. The Goldman Sachs Group reaffirmed a “neutral” rating on shares of Clean Harbors in a research note on Wednesday, July 29th. Wall Street Zen upgraded shares of Clean Harbors from a “hold” rating to a “buy” rating in a report on Saturday, August 1st. Raymond James Financial reissued a “strong-buy” rating and set a $375.00 price objective on shares of Clean Harbors in a research report on Thursday, July 30th. Finally, Citigroup upped their price objective on shares of Clean Harbors from $349.00 to $376.00 and gave the stock a “buy” rating in a report on Thursday, July 30th. Two analysts have rated the stock with a Strong Buy rating, ten have given a Buy rating and five have assigned a Hold rating to the company. According to data from MarketBeat, the company currently has an average rating of “Moderate Buy” and a consensus price target of $354.57.

View Our Latest Research Report on Clean Harbors

Key Clean Harbors News

Here are the key news stories impacting Clean Harbors this week:

Positive Sentiment: Zacks raised its FY2026 EPS estimate to $9.51 from $8.28 and its FY2027 estimate to $9.48 from $8.85. The firm also lifted estimates for Q3 2026 to $3.14 from $2.57, Q4 2026 to $1.97 from $1.90, Q1 2027 to $1.47 from $1.40, Q2 2027 to $2.83 from $2.75, Q3 2027 to $3.10 from $2.69, Q4 2027 to $2.08 from $2.02, and Q1 2028 to $1.15 from $1.05. The upgrades suggest stronger expected operating performance and earnings momentum for Clean Harbors. Clean Harbors analyst estimate revisions
Neutral Sentiment: The revised FY2026 EPS forecast of $9.51 now matches the broader analyst consensus, reducing the likelihood that the change alone will create a major positive surprise. Clean Harbors recently reported quarterly results above expectations, with revenue rising 11.9% year over year, but its valuation remains relatively elevated at about 38 times earnings.
Negative Sentiment: Zacks slightly lowered its Q2 2028 EPS estimate to $2.51 from $2.52. The reduction is immaterial, but it provides a minor counterpoint to the otherwise favorable revisions.

Insider Buying and Selling

In related news, Director Lauren States sold 789 shares of the business’s stock in a transaction dated Tuesday, May 26th. The shares were sold at an average price of $286.19, for a total transaction of $225,803.91. Following the sale, the director owned 11,359 shares of the company’s stock, valued at $3,250,832.21. The trade was a 6.49% decrease in their ownership of the stock. The transaction was disclosed in a legal filing with the SEC, which is available at this link. Also, Director Andrea Robertson sold 789 shares of the company’s stock in a transaction dated Monday, August 3rd. The stock was sold at an average price of $314.01, for a total transaction of $247,753.89. Following the completion of the sale, the director owned 8,979 shares in the company, valued at approximately $2,819,495.79. This trade represents a 8.08% decrease in their position. The SEC filing for this sale provides additional information. Insiders sold a total of 4,078 shares of company stock worth $1,276,908 in the last three months. 5.00% of the stock is owned by corporate insiders.

Clean Harbors Company Profile

(Free Report)

Clean Harbors, Inc is a leading provider of environmental, energy and industrial services in North America. The company specializes in the collection, transportation and disposal of hazardous and non-hazardous wastes, emergency spill response and remediation, industrial cleaning and on-site field services. Its comprehensive service offering also includes chemical neutralization, drum crushing, high-pressure water blasting, tank cleaning and vacuum services designed to help customers meet stringent environmental regulations.

Founded in 1980 by Alan S.