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Donaldson is a leading manufacturer of filtration systems and replacement parts, including air filtration systems, liquid filtration systems, and dust, fume, and mist collectors. The company serves a diverse range of end markets, including construction, mining, agriculture, truck, and industrial. Its business is organized into three segments: mobile solutions, industrial solutions, and life sciences. Donaldson generated approximately $3.9 billion in revenue in its fiscal year 2026.

Caterpillar is the world's leading manufacturer of construction and mining equipment, off-highway diesel and natural gas engines, industrial gas turbines, and diesel-electric locomotives. Its reporting segments are construction, resource, energy, and transportation. Market share approaches 20% across many products. Caterpillar operates a captive finance subsidiary to facilitate sales. The firm has a global reach that is approximately evenly balanced between the US and the rest of the world. Construction skews more domestic, while the other divisions are more geographically diversified. An independent network of over 150 dealers operates approximately 2,800 facilities, giving Caterpillar reach into about 190 countries for sales and support services.