Clean Harbors’ first quarter results were met with a negative market reaction, with management attributing the outcome to mixed revenue growth and margin expansion in both major business segments. While Environmental Services saw continued demand for project and emergency response work—including PFAS remediation—adverse weather and softness in Industrial Services tempered overall top-line performance. Co-CEO Eric Gerstenberg highlighted that “our ES segment achieved positive Q1 results despite certain market conditions,” and noted a strong finish to the quarter, particularly in project-driven landfill volumes and technical services. Meanwhile, Safety-Kleen Sustainable Solutions’ profitability improved due to disciplined pricing and a late-quarter surge in base oil prices, offsetting year-on-year revenue declines in that segment.
Is now the time to buy CLH? Find out in our full research report (it’s free for active Edge members).
Clean Harbors (CLH) Q1 CY2026 Highlights:
- Revenue: $1.46 billion vs analyst estimates of $1.47 billion (1.9% year-on-year growth, 0.7% miss)
- Adjusted EPS: $1.19 vs analyst estimates of $1.15 (3.4% beat)
- Adjusted EBITDA: $247.9 million vs analyst estimates of $242.5 million (17% margin, 2.2% beat)
- EBITDA guidance for the full year is $1.27 billion at the midpoint, above analyst estimates of $1.25 billion
- Operating Margin: 8.1%, in line with the same quarter last year
- Market Capitalization: $15.66 billion
While we enjoy listening to the management's commentary, our favorite part of earnings calls are the analyst questions. Those are unscripted and can often highlight topics that management teams would rather avoid or topics where the answer is complicated. Here is what has caught our attention.
Our Top 5 Analyst Questions From Clean Harbors’s Q1 Earnings Call
- Noah Kaye (Oppenheimer) asked about segment growth profiles, particularly the acceleration in Environmental Services and base oil pricing impacts. Co-CEO Eric Gerstenberg responded that strong trends in technical and field services are expected to continue, while Industrial Services remains flat year-over-year.
- Bryan Burgmeier (Citi) inquired about the impact of rising diesel costs. Co-CEO Mike Battles explained that most diesel expenses are offset by a monthly recovery fee, minimizing the effect on margins.
- Jerry Revich (Wells Fargo) pressed for details on Industrial Services demand, especially regarding refinery turnaround timing and opportunities. Gerstenberg said turnarounds are currently shorter in duration, with the potential for increased activity later in the year, but guidance does not assume a significant rebound.
- James Ricchiuti (Needham) sought color on market verticals driving Environmental Services growth. Gerstenberg highlighted strength in healthcare, retail, pharma, and manufacturing, citing improved volume trends and a growing project services pipeline.
- Adam Bubes (Goldman Sachs) questioned the sustainability of the “charge for oil” model in Safety-Kleen. Battles emphasized the company’s reluctance to revert to previous pricing practices, prioritizing margin stability even if it means managing collection volumes carefully.
Catalysts in Upcoming Quarters
In upcoming quarters, our analyst team will be watching (1) the pace at which PFAS-related project wins convert to revenue as regulatory clarity improves, (2) whether base oil price tailwinds persist or normalize, affecting Safety-Kleen’s margins, and (3) the effectiveness of field service branch expansion in driving cross-segment growth. Progress on AI-related productivity initiatives and stabilization in Industrial Services will also be key indicators to track Clean Harbors’ execution on its strategy.
Clean Harbors currently trades at $296.37, down from $313.70 just before the earnings. At this price, is it a buy or sell? Find out in our full research report (it’s free).
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