Big tech stocks, explained

A handful of US technology companies have grown so large they move whole markets. But 'tech' is not one thing: some make phones, some rent out computing power, some design the chips everything else runs on, and their fortunes do not all rise and fall together.

Their size and popularity also means high expectations are already baked into the price, which is its own kind of risk. Each name below links to a full explainer of what the company does and what to weigh up.