The British chip designer had beaten revenue and earnings estimates, but investors took profits after Wednesday's 13.6% rally.
Elsewhere, Agilon Health jumped 48% on strong earnings and higher guidance, DoorDash rose 10% on order-value guidance, and Fortinet gained more than 13% after easing AI disruption concerns.
Whirlpool fell nearly 17% after warning price rises were needed as Middle East conflict hurt demand, while Snap dropped 10% after abandoning an AI integration deal with Perplexity.
Arm's new AI chip targets a $100B market, so why did its stock drop right after the company beat all estimates?
AI boosted Fortinet but sank Snap's deal. What separates successful AI integration from a costly failure for major companies?
With consumer confidence at 'recession-level lows,' can Whirlpool's aggressive price hikes truly save its profitability from sinking further?