Why Is Arm Holdings (ARM) Stock Down 9.74% Today Sep 14? AI Slowdown Fears and 5% Yields Hit High-Valuation Chips

Arm fell ~9.7% amid an AI-led semiconductor derating as frontier-AI leaders signaled a more measured development pace, raising concerns about near-term AI hardware demand. The move was amplified by a risk-off macro backdrop, with elevated oil prices and the U.S. 10-year yield near 5% pressuring high-multiple tech via valuation compression. Spillovers hit the broader chip complex, keeping semiconductor sentiment fragile in the short term.