3 PayPal – $87.9 Billion
Apple has been steadily encroaching into PayPal’s territory since 2014, when it launched its proprietary Apple Pay system — and particularly since it launched its PayPal-like, peer-to-peer payment system, Apple Pay Cash.
If it manages to be approved by antitrust regulators, acquiring PayPal could give Apple an edge in convincing consumers to adopt its payment system. And, perhaps more importantly, it would give Apple some extra clout in convincing merchants to add support for it, too.