Square opens at $11.20 a share in market debut

Earlier this month, the company set the price range at $11 to $13 a share, valuing Square at up to $4.2 billion, or 30 percent less than in a private fundraising round a year ago. The company, run by Twitter CEO Jack Dorsey, is one of the most prominent "unicorns," or private companies valued at $1 billion or more, to plan a public debut this year. In the nine months ended Sept. 30,...