Arm Holdings shares were sliding during the regular session as investors reevaluated semiconductor valuations following a period of significant growth. The stock, which had surged 143% year to date as of October 9, faced broader sector pressure as market participants raised questions regarding the sustainability of AI-related revenue growth. While the company remains well-positioned to benefit from the rise of AI agents and data center CPU demand, the pullback reflects a cooling trend across the semiconductor industry that pulled stocks off their October highs.