Jack Dorsey (L), CEO of Square and CEO of Twitter, is congratulated by Jim McKelvey, co-founder of Square, (2nd R) and NYSE President Tom Farley (R) after the IPO of Square Inc., in New York November 19, 2015. Square Inc priced shares at $9 for its initial public offering, about 25 percent less than it had hoped, as it struggled to win over investors skeptical about its business and valuation before trading begins on Thursday. REUTERS/Lucas Jackson