Clean Harbors heads into its third-quarter report having raised its full-year profit outlook twice in a row, yet the stock has slipped since the last update. That disconnect frames the October 28 release. The market seems to be asking how much of the company's recent surge comes from a temporary spike in lubricant and base-oil prices, and how much reflects a sturdier environmental services engine that should keep compounding after the commodity tailwind fades.

Wall Street expects earnings of $3.18 a share on revenue of about $1.72 billion, which would mean roughly 44% profit growth and 11% sales growth over the year-ago quarter's $2.21 and $1.55 billion. Those are strong numbers, but they sit slightly below the second quarter's $3.22 and $1.74 billion. The Street is effectively penciling in a plateau rather than further acceleration. That looks sensible against management's framework: full-year adjusted EBITDA guidance now stands at $1.35 billion to $1.41 billion, up from $1.27 billion a quarter earlier and $1.23 billion before that, with free cash flow guidance lifted to a $550 million midpoint.

The swing factor is Safety-Kleen Sustainability Solutions, the re-refining business. Its full-year EBITDA target has roughly doubled across two quarters to $275 million on global base-oil supply disruptions, and second-quarter segment EBITDA jumped 143%. Management has been explicit that this is not a durable base, since its guidance assumes pricing drifts back toward pre-war levels in the fourth quarter. The third quarter should still enjoy elevated spreads, so the more useful clue may be any updated read on how quickly that normalization is unfolding. A slower fade would set up a third guidance raise. A faster one would put more weight on everything else.

That everything else is where the bull case either holds or cracks. Environmental Services margins reached 27.9% last quarter, extending a 17-quarter streak of year-over-year improvement, and incineration utilization climbed to 91%. Extending the streak and keeping incinerators near full would show that pricing power and volume are not commodity stories. Technical services and landfill volumes grew briskly, and management lifted its PFAS growth expectation to above 30%, helped by the Pentagon lifting its moratorium on PFAS incineration. Evidence that military and commercial PFAS work is converting into revenue would reinforce that upgrade. Industrial services remains the weak spot, with turnaround activity down about a third as refineries run flat out. Any sign of deferred maintenance finally returning would be a bonus, while more of the same is largely expected. Corporate costs, now guided up 8% to 10%, deserve scrutiny because further creep would erode the operating leverage story.

The newer catalysts are too young to move this quarter's numbers much, but progress reports matter. The data center offering launched with 10 sites won and a dozen more under bid against a $200 million revenue goal for 2028, so additional wins would lend credibility to a target that was brand new last quarter. Updates on the $305 million ES&H Gulf Coast acquisition and the 10-year reshoring disposal contract, which contributes only about $10 million this year, will help investors judge the earnings runway beyond 2026.

Sentiment has warmed considerably, with bullish readings rising sharply from near-neutral levels before the last report, even as the shares fell about 4% while the S&P 500 gained nearly 4%. The stock sits above its 200-day moving average but mid-range, well short of its post-earnings high near $336. The central question is whether Clean Harbors can show that its core waste franchise is strong enough to keep earnings climbing once the base-oil windfall recedes. If margins and utilization hold while the new growth vectors gain traction, the recent underperformance may look overdone.