U.S. technology “megacap” companies decline as investors focus on two themes: an ongoing downturn tied to SpaceX’s weaker performance and increasing caution over how much companies are spending on artificial intelligence. Multiple outlets report that stocks of major hyperscalers, including Alphabet and Amazon, move lower, with expectations that they could lose significant market value. The reports link the market slide to fears that AI-related costs may rise faster than revenue, pressuring near-term earnings or margins. SpaceX’s continued slump is cited as part of broader sentiment affecting the tech sector, though details on specific operational or financial drivers are not consistently described across the coverage. Overall, the articles portray a market reassessing growth and profitability assumptions for large technology firms, particularly those heavily investing in AI infrastructure and services. While the reports differ in how they frame the magnitude of losses, they converge on the same direction of travel for U.S. megacap tech stocks and the same concerns around AI spending levels.