NASDAQ:ALGM 6 January 2026 - 29 January 2026

Allegro MicroSystems shares climbed roughly 8.5% to $37.50 in Thursday’s afternoon session, buoyed by a sharp rise in quarterly sales and new March-quarter guidance. The chipmaker’s stock fluctuated from $34.56 to $39.75, outpacing the broader semiconductor sector, which dipped. The iShares Semiconductor ETF fell around 0.9%, while auto-focused rivals ON Semiconductor and NXP Semiconductors slid about 4% each.

Allegro MicroSystems jumped 6.5% to $32.78 in afternoon trading Wednesday, beating a mixed pack of analog and power chipmakers. The boost came after the company announced it will hold an analyst day next month. Onsemi and Texas Instruments gained roughly 2.3% and 1.3%, respectively, while STMicroelectronics fell about 1.6%.