Shares of Monolithic Power Systems (MPWR) fell as much as 7.4% on September 14, 2026. Edgewater Research reported that Nvidia may remove the company as a supplier for its Blackwell AI GPU platform. Performance concerns reportedly prompted Nvidia to cancel several unconfirmed orders.
The decline occurred alongside a broader downturn in the semiconductor industry. Leaders at major AI firms called for a development slowdown, citing safety risks. These warnings fueled concerns over future capital spending and triggered a market rotation away from technology stocks.