ALGM

Allegro Microsystems, Inc.

A maker of the tiny magnetic sensors and power chips that quietly run modern life, Allegro MicroSystems builds the components that measure wheel speed for anti-lock brakes, position for electric power steering, and current for everything from car motors to AI data centers. The company traces back to the semiconductor division of Sprague Electric, spun off in 1990 and bought by Japan's Sanken Electric. Fun fact: the "Allegro" name means "fast and lively" in music — fitting for chips that track motion, and the company still calls New Hampshire home.