Donaldson is a 110-year-old filtration specialist — it makes the air, fuel, oil and hydraulic filters that keep engines, factories and now biopharma processes clean. Its moat is the razor-and-blade aftermarket: it sells filters onto OEM equipment, then earns high-margin recurring revenue every time those filters are replaced (~half of sales). It is pushing that filtration know-how into bioprocessing via a fast-growing Life Sciences arm.
What Donaldson Company, Inc. really sells
Donaldson is a 110-year-old filtration specialist — it makes the air, fuel, oil and hydraulic filters that keep engines, factories and now biopharma processes clean. Its moat is the razor-and-blade aftermarket: it sells filters onto OEM equipment, then earns high-margin recurring revenue every time those filters are replaced (~half of sales). It is pushing that filtration know-how into bioprocessing via a fast-growing Life Sciences arm.