The index's rally is dangerously narrow, and a stumble in either tech giant could unwind the entire bull run.

On Thursday, Accenture hit its biggest one-day drop on record after forecasting worries that AI could hollow out consulting.

The largest IPO in history gives Elon Musk's rocket company a win, and signals how massive the next OpenAI and Anthropic deals could be.

First-day trading for the aerospace and AI company turned an unprecedented IPO into a $2tn-style market reckoning for public-market readiness.

The Elon Musk company set a target price for buyers earlier than expected, putting a giant private valuation in the market’s spotlight.