Twitter's founder founded this company. After its initial IPO at $9, the performance of the share prices have not been impressive. For some time, it has even fallen below the IPO $9. The reason for that was the tough competition in the payment industry, mainly, Paypal.
Square has not yet turned profitable; however, it recently announced that it would jump on the Bitcoin bandwagon. People can buy and sell Bitcoin through the Square app. The markets liked that news.
Square is now up more than 200% year to date.