◆ The business machine behind AI · follow the money

The Stack

Who got bought, who raised, whose stock jumped — and the layer-by-layer map that makes the headlines make sense. We explain the industry; your money decisions are yours.

💸 Money moves

🏗️ The five layers

Every AI headline lives on one of these floors. Top floor is the apps you touch; bottom floor is the power plants. Money flows down, capability flows up — and you, doing real work with it, sit on top of the whole thing. Company names link to the company; the little gray tags are stock tickers for the ones that are publicly traded — no tag means privately held, so you can't buy shares directly. Facts, not picks.