Atmus makes filtration products for commercial vehicles and industrial equipment, sold under its Fleetguard brand. Products include fuel, lube, air, hydraulic, and crankcase ventilation filters, as well as coolants — consumable components that protect engines from contaminants, extend service intervals, and help equipment meet emissions standards. Atmus sells into two end markets: on-highway (~58% of net sales), covering heavy- and medium-duty trucks and buses, and off-highway (~42%), covering agriculture, construction, mining, and power generation equipment. Starting in 2026, Atmus reports in two segments: Power Solutions (the legacy filtration business) and Industrial Solutions, established via its January 2026 acquisition of Cook Filter, an industrial air filtration business. The core of Atmus' business model is the aftermarket (~86% of net sales), where filters are replaced on a recurring maintenance schedule, providing stable, recurring demand largely independent of new vehicle production. The remaining ~14% is first-fit — filters installed on new vehicles at the OEM level — which Atmus pursues strategically because each vehicle sold creates years of downstream aftermarket demand. Atmus manufactures a significant portion of its proprietary filtration media in-house, which reduces costs and supports faster product development. Atmus sells through OEM dealers, independent distributors, and retail outlets, and works directly with large fleet and mining customers to build brand preference that pulls demand through distribution channels.