Buys small instrument makers, raises their margins, and repeats.

Ametek makes precision electronic instruments and electromechanical components for industrial niches: sensors, measurement equipment, specialized motors. It sells to manufacturers, labs, and aerospace, and charges for high-margin hardware that's hard to replace once installed.

Its edge isn't a single product, it's the machine: it buys small companies, cuts their costs, and raises their margins. That operating discipline, repeated over decades, is hard to copy because it takes culture, not capital. Even so, the model doesn't earn a wide moat: the moat lives in execution, not in monopoly.