AMD stock
On July 19, 2026, AMD shares faced significant downward pressure, closing at $495.76, following the release of the Kimi K3 AI model by Chinese startup Moonshot. Kimi K3 is touted as the world's largest publicly available open--weight AI model, outperforming several benchmarks while being priced significantly lower than Western proprietary alternatives. This development triggered a sector--wide rotation out of high--valuation US semiconductor stocks, as investors reassessed the "more compute" thesis and the competitive landscape for AI hardware. The resulting 11.1% weekly decline reflects growing market sensitivity to non--US AI advancements and their potential impact on the long--term pricing power of leading chip designers.