On August 6, Atmus Filtration Technologies (NYSE:ATMU) reported second-quarter sales of $528 million, up 16.4% from $454 million a year earlier and a company record. Adjusted EPS climbed to $0.82 from $0.75, while adjusted free cash flow nearly doubled to $67 million from $36 million. The quarter capped a period in which the filtration maker leaned on both an aftermarket rebound and its first acquisition outside its core diesel-engine business.
Bull Case: Margins Widen As Volumes Return
Power Solutions, the core diesel filtration business, grew sales 7% to $486 million, with pricing adding 3 points, volume 2 points, and foreign exchange 2 points. Gross margin expanded to 29.2% from 28.9% a year earlier, and total adjusted EBITDA reached $109 million. Management pointed to a cyclical recovery already showing up in the numbers, plus new regulatory clarity from the EPA, which proposed letting engine makers sell current models into 2027 under a nonconformance penalty. That, executives said, should ease the pre-buy pressure that has weighed on truck demand.
Meanwhile, the integration of Koch Filter, the industrial filtration business Atmus bought earlier this year, is more than 95% complete on its transition services agreement, with the rest wrapped up by the third quarter. Industrial Solutions contributed $42 million in sales at an 18.9% adjusted EBITDA margin, and the company narrowed its full-year adjusted EBITDA guidance to a range of 19.75% to 20.25%, with adjusted EPS guided to $2.85 to $3.00. Free cash flow funded $18 million in dividends and buybacks during the quarter.
Bear Case: Costs And Conflict Cloud Progress
Not everything moved in Atmus’s favor. Selling, administrative, and research expenses rose to $62 million from $57 million, driven by people costs and information technology consulting, and gross margin gains came despite higher materials and manufacturing costs eating into the pricing benefit. Joint venture income held flat at $8 million only because strong results in China offset a weaker India business, which management said has been hurt by the Middle East conflict.
Other income swung to a $1 million expense from $4 million of income a year earlier, a result executives tied to foreign exchange losses and a one-time gain that did not repeat. And while management described freight market sentiment as improving, with higher spot rates and growing optimism, it stopped short of calling that a real inflection, guiding aftermarket demand to stay roughly flat year over year. The company’s plan to expand further into industrial filtration also depends on finding future acquisitions, since Koch Filter integration is nearly finished but the broader platform Atmus wants to build has not yet found its next anchor investment.
Funds Buy In Quietly
Hedge fund ownership of Atmus rose to 39 funds in the most recent quarter from 37 the quarter before, a modest sign of accumulating conviction. Short interest sits at just 3.99% of float, which points to little organized skepticism toward the stock. That combination suggests the market has not built much of a bearish case against the name.
What The Quarter Leaves Open
Atmus enters the back half of 2026 with record sales, improving margins and a nearly finished acquisition integration behind it. For the bulls, the case rests on regulatory clarity holding, the freight cycle actually turning, and Industrial Solutions scaling beyond Koch Filter’s initial contribution. For the bears, rising SG&A costs, elevated material expenses, and a still-flat aftermarket show the recovery is not complete.
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