Atmus Filtration Technologies (ATMU) is back in focus after its late 2025 purchase of Koch Filter Corp, a move that is expected to lift EBITDA margins and EPS as the industrial filtration push takes shape.

The stock has recently moved out of a softer patch, with the 90-day share price return down 13.03% and the 30-day share price return down 3.56%. More recently, it has shown a stronger near-term tone, reflected in a 7-day share price return of 8.47% and a 1-day gain of 3.36%. Over a longer horizon, the 1-year total shareholder return of 41.89% and the 3-year total shareholder return of around 16x indicate very strong historical momentum.

If Koch Filter puts industrial filtration on your radar, it can also be worth scanning other filtration and equipment suppliers linked to infrastructure and manufacturing, starting with 34 power grid technology and infrastructure stocks

With revenue growth of 6.65%, net income growth of 10.91% and the stock trading around a 29% intrinsic discount, the key question is whether ATMU is still underpriced or whether the market is already baking in future growth.

Most Popular Narrative: 25% Undervalued

With Atmus Filtration Technologies last closing at $49.80 against a narrative fair value of $66.40, the current price sits well below that modeled estimate and puts the focus on what is driving such a gap.

The company's push into industrial filtration (beyond automotive), both through disciplined M&A and organic new product launches, taps into the growing replacement and modernization needs of automated and digitized industrial environments, expanding the total addressable market and supporting both revenue growth and margin diversification.

Want to understand why this filtration specialist carries such a premium fair value? Revenue, earnings and margins are all wired into one detailed set of projections. The crucial piece is how fast profitability ramps and what multiple the market might eventually pay for those earnings.

Result: Fair Value of $66.40 (UNDERVALUED)

However, this depends on aftermarket resilience and Cummins exposure remaining manageable. Any deterioration in emissions rules or tariffs could quickly challenge that upside story.

Next Steps

With sentiment split between the upside case and the risks, this is a moment to review the data yourself, move promptly, and weigh both sides using the 5 key rewards and 2 important warning signs.

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This article by Simply Wall St is general in nature. We provide commentary based on historical data and analyst forecasts only using an unbiased methodology and our articles are not intended to be financial advice. It does not constitute a recommendation to buy or sell any stock, and does not take account of your objectives, or your financial situation. We aim to bring you long-term focused analysis driven by fundamental data. Note that our analysis may not factor in the latest price-sensitive company announcements or qualitative material. Simply Wall St has no position in any stocks mentioned.