Tech startup Square counters negative sentiment to soar 64% on market debut

Tech startup Square counters negative sentiment to soar 64% on market debut

Jack Dorsey (L), CEO of Square and CEO of Twitter, Jim McKelvey co-founder of Square (2nd R) and NYSE President Tom Farley (R) watch as Mac Riley rings a ceremonial opening bell on the floor of the New York Stock Exchange for the IPO of Square Inc., in New York November 19, 2015. REUTERS/Lucas Jackson

Shares of Square Inc, the mobile payments company co-founded and still run by Twitter Inc Chief Executive Jack Dorsey, soared as much as 64 percent in their market debut, following a marked-down initial public offering, countering the negative sentiment that has nagged at Silicon Valley startups in recent weeks.

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