Clean Harbors Inc

Clean Harbors raised its full-year 2026 guidance after a better-than-expected first half, lifting the midpoint of its adjusted EBITDA outlook by $110 million to $1.38 billion, with a range of $1.35-$1.41 billion. The company also increased the midpoint of its adjusted free cash flow outlook by $30 million to $550 million, guiding to $520-$580 million. For the third quarter, management expects adjusted EBITDA to rise 24-28% year over year, supported by emergency-response activity, PFAS opportunities, reshoring-related demand and favorable conditions for re-refined products. Clean Harbors generated more than $120 million in PFAS-related revenues in 2025, with that figure tracking more than 30% year-over-year growth by the second quarter, against an initial 2026 projection of 25-35% growth. Adjusted free cash flow swung from negative $76 million in the first quarter to $136 million in the second quarter, while operating cash flow rose 15% year over year to $239 million, and the company repurchased $25 million and $27.1 million of shares in the first and second quarters respectively, leaving nearly $550 million under its authorization as of June 30. Clean Harbors stock has gained 10.4% over the past six months, against a 5.7% decline for its industry and a 16% rise for the Zacks S&P 500 Composite.

Clean Harbors has signed a definitive agreement to acquire EnviroServe from an affiliate of One Rock Capital Partners for $470 million in cash, with the deal expected to close in the second half of the year. The acquisition will be funded through existing cash and additional debt, and Clean Harbors projects cost synergies of about $25 million in the first two years, bringing the post-synergy multiple to roughly 9x adjusted EBITDA. EnviroServe, a national environmental and waste management provider, generates about $250 million in annual revenue and $27 million in adjusted EBITDA, with 85% of revenue recurring and top customers averaging over 16 years of tenure. The deal expands Clean Harbors' railcar cleaning capacity with five facilities and adds a fleet of over 1,400 vacuum boxes, roll-off containers, and frac tanks. However, bears cite integration risks, potential synergy shortfalls, and increased leverage from debt funding, while institutional interest has grown, with hedge fund holdings rising to 61 from 51 in the prior quarter.

Clean Harbors has agreed to acquire environmental and waste management services provider EnviroServe from One Rock Capital Partners for $470 million in cash. EnviroServe operates a network of 40 locations, including 18 10-day transfer facilities, waste solidification facilities, and railcar cleaning locations, serving nearly 2,500 customers. Clean Harbors expects EnviroServe to generate approximately $27 million in annual adjusted EBITDA on $250 million of revenues and to realize about $25 million in cost synergies over the first two years, equating to a post-synergy acquisition multiple of roughly 9 times adjusted EBITDA.

Clean Harbors has agreed to acquire Western Oil for $30 million as part of a broader push to grow through targeted deals. Management expects the acquisition to contribute $4 million to $6 million in annual adjusted EBITDA and to enhance feedstock for the New Hampshire re-refinery and spill response capacity. Company executives indicated they are actively pursuing additional bolt-on acquisitions that could reshape the company's operational footprint and service reach. The deal adds to Clean Harbors' field services and waste oil collection network in New England, and investors are watching how integration and future deals affect margins and capital allocation.

Clean Harbors exceeded its second-quarter guidance with record revenue, adjusted EBITDA, and adjusted EBITDA margin. The company announced a significant 10-year disposal contract valued at $600 million, expected to provide a decade-long growth runway. It is also expanding into the data center market with plans to invest $50 million over the next three years. The Safety-Kleen Sustainability Solutions segment delivered a greater than 40% increase in top-line revenue, driven by elevated market pricing and effective oil collection management. However, the company faces uncertainty around base oil pricing and anticipates a decrease in adjusted EBITDA for that segment in the fourth quarter.

Clean Harbors and Waste Management present contrasting investment cases in the environmental services sector for 2026. Clean Harbors, a hazardous waste specialist, reported fiscal 2025 revenue of nearly $6.0 billion and net income of approximately $391.0 million, with a debt-to-equity ratio of 1.3x and free cash flow of nearly $438.2 million. Waste Management, a solid waste and recycling giant, posted fiscal 2025 revenue of $25.2 billion and net income of approximately $2.7 billion, driven partly by its Stericycle acquisition, with a debt-to-equity ratio of 2.3x and free cash flow of approximately $2.8 billion. Clean Harbors trades at a forward P/E of 33.8x and a P/S ratio of 2.6x, while Waste Management trades at a forward P/E of 28.2x and a P/S ratio of 3.7x. The choice hinges on investor preference: Waste Management offers a steady dividend and buybacks with municipal contract stability, while Clean Harbors provides a high-moat, regulation-driven growth opportunity tied to stricter EPA rules on forever chemicals.

Clean Harbors shares have risen 24.4% over the past year, outperforming its industry's 7.3% decline. The Zacks Consensus Estimate projects 2026 revenues of 6.3 billion dollars, up 4.2% year-over-year, with earnings per share expected to reach 8.5 dollars in 2026 and 9.4 dollars in 2027. Growth is supported by a 25 to 35% acceleration in PFAS management, AI-driven operational efficiencies that have helped margins rise for 16 straight quarters, and a strong liquidity position with 669 million dollars in cash against 13 million dollars in current debt. The company also repurchased 250 million dollars in shares in 2025, though it faces risks from rising operational costs, lack of a dividend, and intense competition. Clean Harbors currently carries a Zacks Rank of 3, or Hold.

Clean Harbors is seeing growth from strong demand for hazardous waste disposal and strategic acquisitions, though intense competition and currency exposure weigh on profitability. The company operates North America's largest network of hazardous waste incinerators, landfills, and treatment facilities, and in 2024 it acquired HEPACO to boost field services and Noble Oil Services to expand oil collection in the southeastern United States. It repurchased $250 million in shares over the past year, up from $55.2 million in 2024, and reported first-quarter 2026 adjusted earnings of $1.19 per share on revenues of $1.46 billion. However, Clean Harbors faces pricing pressure from large national and smaller regional rivals, foreign exchange risk from Canadian operations, and does not pay a dividend.