Square Inc IPO to value company at up to $4.2 billion

(Reuters) - Mobile payments company Square Inc, headed by Twitter Inc Chief Executive Jack Dorsey, said it expects its initial public offering to price at between $11 and $13 per share, valuing the company up to $4.2 billion. The San Francisco-based company said in a regulatory filing on Friday it would sell 25.7 million Class A common shares, while selling stockholder Start Small Foundation, a charitable fund created by Dorsey, would sell about 1.35 million. Neither Twitter nor Square has been