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For informational purposes only. Not investment advice.

Clean Harbors, Inc.

CLH

FAVORABLE

May 27, 2026

Research Conclusion

HOLD-ACCUMULATE — Moderate Conviction. Clean Harbors is a quality environmental-services compounder with an irreplicable permit moat (TSDF incinerators, treatment facilities), a multi-decade PFAS regulatory tailwind, and aggressive capital return (record buyback + founder ownership). At ~$303 vs. PWFV $320-330, modest 5-10% upside; PFAS optionality is partially priced. Better entry at $260-285 on any cyclical weakness. Hold existing positions; aggressive add only on industrial recession.

Company Overview & Moat Assessment

Clean Harbors, Inc. (NYSE: CLH) is the largest North American provider of environmental, energy, and industrial services, operating through two segments: Environmental Services (~65% of revenue) which provides hazardous waste collection/treatment/disposal via a network of permitted incinerators, landfills, and TSDFs across the US and Canada; and Safety-Kleen Sustainability Solutions (SKSS, ~35%) which is the #1 North American used-oil re-refiner. FY2025 revenue was $6.03B with $1.12B EBITDA and $442M FCF. CLH is led by Co-CEOs Eric Gerstenberg and James Battles, with founder Alan McKim ($930M stake) as Executive Chairman/CTO. The company executed a record $250M share buyback in FY2025 and approved $350M additional authorization.

▲ Bull Case

  • ◆PFAS materializes faster than consensus: $200M+ FY2027 PFAS revenue at 35%+ margin; EBITDA contribution +$70M-100M; multiple expands on rerating to 35x → $432
  • ◆SKSS margin recovery to 19-20% EBITDA: Base oil pricing normalizes; segment EBITDA +$100-150M; total EBITDA margin 21%+ → +$30-50/share
  • ◆Buyback compounds: 2%+ annual share reduction + DCI bolt-on M&A: Capital allocation continues at $250-300M/yr; per-share EPS growth accelerates above revenue growth → $400+ by FY2028

▼ Bear Case

  • ◆PFAS delayed by EPA enforcement timing slip: Compliance pushed to 2028-2029; revenue trajectory cut in half; multiple narrows 5x → -7-15%
  • ◆SKSS structurally impaired: Base oil pricing stays weak permanently; segment EBITDA margin 12% baseline; ~$150M annual headwind → -15-20%
  • ◆Industrial recession + multiple compression: Industrial customers cut services spend; multiple compresses from 28-30x to 22-24x → -25-30%
Primary Debate on Wall Street

“Bulls: PFAS is a decade-defining demand driver; permit moat means no new supply; founder + buyback signals stock is cheap. Bears: 41x P/E is expensive for ~8-11% ROIC and 7-8% reported revenue growth; PFAS is uncertain timing; multiple compression risk is meaningful. Decision-margin: how rapidly does PFAS scale and how durable is the permit moat valuation premium. Most analysts have FY2027 EPS at $11.50 (vs. this $12.04) — modest upward revisions likely if PFAS confirms.”

Top Catalysts
  • ◆PFAS revenue first material quarter disclosure (2026-2027) — HIGH magnitude rerating event
  • ◆SKSS margin recovery confirmation to >17% (Q2-Q3 2026) — MEDIUM-HIGH magnitude
  • ◆Q2 2026 earnings + FY2026 guide with sequential PFAS revenue growth (August 2026) — HIGH magnitude
  • ◆EPA enforcement timing update confirming firm PFAS compliance deadlines — HIGH magnitude
  • ◆Q4 2026 buyback execution detail showing $300M+ authorization use (February 2027) — MEDIUM magnitude
  • ◆DCI acquisition fully integrated and confirmed accretive (FY2026) — LOW-MEDIUM magnitude
  • ◆Co-CEO clarification with single CEO named — LOW-MEDIUM governance positive
  • ◆Major industrial site remediation contract win — LOW-MEDIUM magnitude per deal
Top Risks
  • ◆Multiple compression (41x → 25x): 30% probability, HIGH severity — mediocre growth + macro weakness
  • ◆Industrial recession over 24-month window: 25% probability, HIGH severity — ISM PMI <45 sustained
  • ◆PFAS enforcement delayed to 2028-2029: 30% probability, MEDIUM severity — EPA compliance delay announcement
  • ◆SKSS structural margin compression below $700/MT base oil: 35% probability, MEDIUM severity
  • ◆McKim leadership disruption (block sale or sudden departure): 15% probability, MEDIUM severity
  • ◆Regulatory scope reduction on PFAS MCL standards: 15% probability, MEDIUM severity
  • ◆ESG capital flight from 'brown industrial' rotation: 15% probability, LOW severity

Full Memo Continues

5 more sections, locked

  • ●
    Valuation Range & DCF
    Base/bull/bear fair-value range, WACC, terminal growth, sensitivity to revenue + margin assumptions.
  • ●
    Risk/Reward Assessment
    Position-sizing framework with explicit upside/downside skew and entry conditions.
  • ●
    Management & Capital Allocation
    Multi-year capital-allocation track record, incentive alignment, and management readout.
  • ●
    Monitoring Framework
    What to watch each quarter — leading indicators and inflection signals tracked by the analyst.
  • ●
    Unresolved Questions
    Open analyst questions and follow-up research items — the depth signal.

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Margin of Insight

For informational purposes only. Not investment advice.