Google.
A foundational compute-and-AI power. (Note: the engine's own file on Google is unusually short — a good example of a node whose reach outruns its paper trail.)
Controls the 'Willow' quantum chip, runs the DeepMind AI lab, and holds the 'Oracle Jerusalem' partnership.
It sits at the base of the compute layer everything else is built on — even where the documented record here is still thin.