Allegro MicroSystems Inc. (NASDAQ:ALGM) fell 9.84% to $55.52 on June 23, 2026, dragged lower by the Philadelphia Semiconductor Index's 8% decline despite the company's automotive and industrial sensor business having limited direct exposure to AI data centre spending.

Key Highlights

  • Allegro MicroSystems closed at $55.52, down $6.06, as the broad semiconductor sector selloff extended to automotive and industrial chip suppliers.
  • Despite being less exposed to AI hyperscaler demand than peers, Allegro carries elevated beta to the semiconductor index on large risk-off days.
  • Allegro's magnetic sensor ICs serve automotive applications including electric vehicle current sensing and motor control, as well as industrial motion systems.
  • The stock had risen more than 110% year-to-date heading into the session, reflecting optimism around its EV and industrial automation end markets.

 

Allegro MicroSystems Inc. (NASDAQ:ALGM) fell 9.84% to close at $55.52 on June 23, 2026, caught in a broad semiconductor sector selloff even though the company's business is primarily oriented toward automotive and industrial markets rather than AI data centre infrastructure.

Allegro designs magnetic sensor integrated circuits and power management ICs for automotive electrification and industrial automation applications. Its products measure current, position, and speed in electric vehicle powertrains, motor controllers, and factory automation systems. While this market exposure is structurally different from AI semiconductor names, Allegro is classified within the semiconductor sector and tends to move with the sector index during large-scale risk-off events.

The June 23 selloff was driven by the intersection of several macro forces: a 10% decline in South Korea's Kospi, a nearly 8% drop in the Philadelphia Semiconductor Index, concerns about AI infrastructure spending sustainability, and amplified selling from leveraged semiconductor ETF rebalancing. In this environment, semiconductor names across all subsectors experienced elevated selling pressure regardless of their individual demand drivers.

Allegro had entered the session with more than 110% in year-to-date gains, driven by positive sentiment around EV powertrain content growth and industrial automation investments. That positioning contributed to the magnitude of the June 23 decline, as extended positions became targets for profit-taking during the sector-wide correction.

Allegro operates as a subsidiary of Sanken Electric Co. of Japan, with its primary manufacturing and design operations in Manchester, New Hampshire. Its sensor ICs are used by major automotive original equipment manufacturers globally.