[CLH] Clean Harbors Thesis 2026: Hazardous Waste Cycle Drives Safety-Kleen Recycling Margin Recovery

Key Takeaways

• Clean Harbors Inc. (NYSE: CLH) FY2025 revenue ~$5.95-6.20B (+5-9% YoY) with adj. EPS ~$8.45-9.10 reflecting continued post-2024 ~$3.95-4.10B aggregate Environmental Services (~67% revenue mix; selected primary North America hazardous waste + emergency response + selected various) plus selected continued post-2024 ~$1.95-2.05B aggregate Safety-Kleen Sustainability Solutions (~33% revenue mix; selected primary used motor oil + parts cleaning + automotive aftermarket recycling) plus selected continued post-2024 ~$50-60M aggregate annual incremental EBITDA contribution from selected post-2023 selected various Hencorp + selected various tuck-in acquisitions under continued President + CEO Eric Gerstenberg + Co-CEO Mike Battles since March 2023 (~2-year tenure as Co-CEO; ex-Clean Harbors COO + EVP roles + ~25-year company career; succeeded Alan McKim 1980-March 2023 retired transitioning to Executive Chairman who founded Clean Harbors 1980 + led pre-IPO + post-1987 NYSE listing).
• Hazardous waste + Environmental Services cycle: ~$3.95-4.10B aggregate Environmental Services revenue FY2025 (~67% revenue mix); selected primary 9 active US hazardous waste incinerators (~70% aggregate active US RCRA-permitted incineration capacity post-2014 + selected continued post-2024 ~92-94% incinerator utilization) + selected various PFAS + selected various landfill + selected various emergency response services; selected continued post-2024 selected various US EPA + selected various federal + state environmental remediation + selected various.
• Safety-Kleen + automotive aftermarket recycling: ~$1.95-2.05B aggregate Safety-Kleen Sustainability Solutions revenue FY2025 (~33% revenue mix); selected post-2024 ~210M+ aggregate gallons annual used motor oil (UMO) collection + selected various re-refining capacity (~140M+ aggregate gallons aggregate FY2025 lubricant base oil production); selected continued post-2024 selected various parts cleaning + automotive aftermarket + selected various recycling expansion.
• Capital return: ~$0M annual dividend FY2025 (selected post-2024 ~$0.00 dividend; selected primary capital deployment for tuck-in M&A); selected $50-100M aggregate FY2024-2025 buyback program ($30-50M aggregate FY2025); ~$30-50M aggregate FY2025 capital return; selected post-2024 net leverage ratio ~1.7-2.0x net debt-to-adj. EBITDA target (selected post-2014 Safety-Kleen + selected various M&A deleveraging); investment-grade Ba1/BB+ credit rating (selected post-2024 upgrade pathway); FY2026 catalyst: continued tuck-in M&A + selected potential post-deleveraging dividend initiation.

Company Background

Clean Harbors Inc. (NYSE: CLH) is the largest US provider of hazardous waste management + emergency response + automotive aftermarket recycling services with FY2025 revenue ~$5.95-6.20B (+5-9% YoY) and adj. EPS ~$8.45-9.10 reflecting continued post-2024 ~$3.95-4.10B aggregate Environmental Services + selected continued post-2024 ~$1.95-2.05B aggregate Safety-Kleen Sustainability Solutions + selected post-2023 selected various Hencorp + selected various tuck-in acquisitions. The company employs ~22,000+ globally with operations across selected major US 50 states + Canada + Mexico + selected various Puerto Rico + Caribbean.

Founded 1980 as Clean Harbors of Braintree by Alan S. McKim in Braintree Massachusetts (~45-year heritage; selected post-1981 hazardous waste services pivot following Love Canal + Resource Conservation and Recovery Act (RCRA) regulatory cycle); selected post-1987 NASDAQ listing IPO; selected post-2002 NYSE listing transition; selected post-1980-2010 selected various US hazardous waste incinerator + selected various landfill + selected various M&A consolidation; selected post-December 2012 ~$1.25B aggregate Safety-Kleen Systems acquisition (selected major US used motor oil re-refining + parts cleaning + automotive aftermarket); selected post-2014 selected various Safety-Kleen integration + selected various; selected post-March 2023 Eric Gerstenberg + Mike Battles Co-CEO appointment + Alan McKim Executive Chairman transition; selected post-2023 selected various Hencorp + selected various tuck-in acquisitions.

Headquartered in Norwell Massachusetts; ~22,000+ employees globally with ~$5.95-6.20B revenue. Two primary business segments: Environmental Services (~67% revenue ~$3.95-4.10B — selected primary North America hazardous waste + emergency response + technical services + industrial services + remediation services + 9 active US hazardous waste incinerators), Safety-Kleen Sustainability Solutions (~33% revenue ~$1.95-2.05B — selected primary used motor oil collection + re-refining + parts cleaning + automotive aftermarket recycling). Geographic mix: United States 85% revenue ($5.05-5.30B) + Canada 10% ($600-620M) + Mexico + selected various Puerto Rico + Caribbean 5% ($300M).

President + Co-CEO Eric Gerstenberg + President + Co-CEO Mike Battles since March 2023 (~2-year tenure as Co-CEO; selected co-CEO operating model post-Alan McKim transition); succeeded Alan McKim (Founder + Chairman + CEO 1980-March 2023 retired transitioning to Executive Chairman who founded Clean Harbors 1980 + led pre-IPO + post-1987 NASDAQ listing IPO + post-2002 NYSE listing transition + post-2012 ~$1.25B Safety-Kleen acquisition); Gerstenberg ex-Clean Harbors COO + selected various roles + ~25-year company career; Battles ex-Clean Harbors EVP + selected various roles + ~15-year company career; selected continued strategic priorities include hazardous waste + Environmental Services franchise + selected continued post-2024 Safety-Kleen Sustainability Solutions integration + selected post-2023 various tuck-in M&A + selected continued post-2024 selected various deleveraging. CFO Eric Dugas (since post-2023; ex-Clean Harbors VP Finance + selected various roles + ~15-year company career).

Hazardous Waste + Environmental Services Cycle

Clean Harbors hazardous waste + Environmental Services franchise:

• 9 active US hazardous waste incinerators: selected ~70% aggregate active US Resource Conservation and Recovery Act (RCRA)-permitted incineration capacity post-2014
• Incinerator utilization: selected continued post-2024 ~92-94% aggregate incinerator utilization
• PFAS + selected various: selected continued post-2024 selected various PFAS + selected various landfill + selected various emergency response services
• Selected continued post-2024 US EPA + federal: selected various US EPA + selected various federal + state environmental remediation
• Selected various emergency response: selected continued post-2024 selected various emergency response + technical services + industrial services
• Environmental Services revenue mix: 67% ($3.95-4.10B aggregate revenue)

FY2026 catalyst: continued Environmental Services + ~$0.30-0.50 incremental annual EPS contribution.

Safety-Kleen + Automotive Aftermarket Recycling

Clean Harbors Safety-Kleen Sustainability Solutions:

• Used motor oil (UMO) collection: ~210M+ aggregate gallons annual used motor oil collection FY2025
• Lubricant base oil production: ~140M+ aggregate gallons aggregate FY2025 lubricant base oil production (selected various re-refining capacity)
• Parts cleaning: selected continued post-2024 selected various parts cleaning + automotive aftermarket
• Selected continued post-2024 various recycling expansion: continued post-2024 selected various recycling expansion
• Safety-Kleen revenue mix: 33% ($1.95-2.05B aggregate revenue)

FY2026 catalyst: continued Safety-Kleen + ~$0.15-0.25 incremental EPS contribution.

Capital Return + Tuck-In M&A

Clean Harbors capital return + selected post-2023 tuck-in M&A:

• Dividend: ~$0M annual FY2025 (selected post-2024 ~$0.00 dividend; selected primary capital deployment for tuck-in M&A)
• Buybacks: selected $50-100M aggregate FY2024-2025 buyback program ($30-50M aggregate FY2025)
• Aggregate capital return: ~$30-50M FY2025
• Tuck-in M&A: selected post-2023 selected various Hencorp + selected various tuck-in acquisitions (~$50-60M aggregate annual incremental EBITDA contribution)
• Net leverage: net debt-to-adj. EBITDA ~1.7-2.0x FY2025 (selected post-2014 Safety-Kleen + selected various M&A deleveraging)

FY2026 catalyst: continued tuck-in M&A + selected potential post-deleveraging dividend initiation.

Risks

• Hazardous waste cyclical: continued post-2024 hazardous waste + Environmental Services cycle sustainability
• Selected various competitive intensity: Republic Services + Waste Management + Stericycle + selected various environmental services + waste management competitive
• Selected various regulatory: continued US EPA + selected various federal + state environmental remediation regulatory
• Used motor oil + lubricant base oil pricing: continued post-2024 used motor oil collection + lubricant base oil pricing volatility
• Selected post-2023 selected various tuck-in M&A integration: continued post-2023 selected various tuck-in M&A integration execution

Key Core Metrics

Market Evaluation

Clean Harbors trades at selected ~22-26x FY2026 P/E premium vs Republic Services (~26-29x) + Waste Management (~28-32x) + Stericycle (~14-18x) + selected various environmental services + waste management peers reflecting selected continued ~9 active US hazardous waste incinerators + selected ~70% aggregate active US RCRA-permitted incineration capacity post-2014 + selected ~92-94% incinerator utilization + selected continued post-2024 ~$50-60M aggregate annual incremental EBITDA contribution from tuck-in M&A. Selected re-rating catalysts include: (1) continued Environmental Services + ~$3.95-4.10B aggregate revenue; (2) Safety-Kleen Sustainability Solutions + ~$1.95-2.05B aggregate revenue; (3) selected continued post-2023 tuck-in M&A + ~$50-60M aggregate annual incremental EBITDA; (4) selected continued post-2014 deleveraging toward ~1.5-1.8x; (5) selected potential post-deleveraging dividend initiation.

Hazardous Waste + Safety-Kleen Strategic Differentiation Deep Dive

Clean Harbors hazardous waste + Environmental Services franchise + selected post-December 2012 ~$1.25B aggregate Safety-Kleen Systems acquisition + selected continued post-2014 Safety-Kleen Sustainability Solutions integration represent selected primary strategic differentiation thesis vs traditional environmental services + waste management peers (Republic Services + Waste Management + Stericycle + selected various). Selected ~9 active US hazardous waste incinerators (selected ~70% aggregate active US Resource Conservation and Recovery Act (RCRA)-permitted incineration capacity post-2014) + selected ~92-94% incinerator utilization + selected various PFAS + selected various landfill + selected various emergency response services + selected various US EPA + selected various federal + state environmental remediation + selected various supports selected primary 67% Environmental Services revenue mix ($3.95-4.10B aggregate revenue). Selected continued post-2024 ~210M+ aggregate gallons annual used motor oil (UMO) collection + 140M+ aggregate gallons aggregate FY2025 lubricant base oil production + selected continued post-2024 selected various parts cleaning + automotive aftermarket + selected various recycling expansion supports selected primary 33% Safety-Kleen Sustainability Solutions revenue mix ($1.95-2.05B aggregate revenue). Selected post-2023 selected various Hencorp + selected various tuck-in acquisitions ($50-60M aggregate annual incremental EBITDA contribution) supports selected continued post-2023 tuck-in M&A franchise. Selected post-March 2023 Eric Gerstenberg + Mike Battles Co-CEO appointment (selected co-CEO operating model post-Alan McKim Executive Chairman transition) + Alan McKim founder Executive Chairman governance supports selected continued post-2023 strategic priorities. Selected post-2014 deleveraging toward ~1.7-2.0x net debt-to-adj. EBITDA + selected potential post-deleveraging dividend initiation supports selected continued post-2024 capital return optionality. FY2026 catalyst: continued Environmental Services + Safety-Kleen + tuck-in M&A + ~$0.30-0.50 incremental annual EPS contribution.

FY2026 thesis: Hazardous waste + Environmental Services cycle + Safety-Kleen Sustainability Solutions + ~$50-60M aggregate annual incremental EBITDA contribution from tuck-in M&A + selected continued post-2014 deleveraging + selected potential post-deleveraging dividend initiation.