SQUARE

SAN FRANCISCO, CALIFORNIA

Two years ago, Square started letting users of Cash App, its peer-to-peer money transfer and digital banking service, buy Bitcoin. The app has grown to 30 million active users. Square generated $1.6 billion in revenue and $32 million in gross profit from Bitcoin in the quarter ended September 30. In October, Square said it had invested $50 million, or 1% of its own total assets, in Bitcoin. (See main story.)

BLOCKCHAIN PLATFORM: Bitcoin