On Thursday, Apple was the most valuable company in the world. On Monday, it was Microsoft. On Tuesday, for the first time ever, it was Nvidia.
Why it matters: Nvidia is a relative newcomer to the world of megacaps: It only broke through the $1 trillion barrier in mid-2023. Now it has eclipsed all of its competitors, thanks to broad excitement about artificial intelligence — which is overwhelmingly powered by Nvidia's chips.