Twitter’s IPO Filing Implies $12.8 Billion Value Amid Growth

Twitter Inc.’s initial public offering documents suggested a valuation of $12.8 billion for the microblogging service, underscoring the seven-year rise of a still unprofitable company that has helped revolutionize how people share information.

In the most anticipated technology offering since Facebook Inc., San Francisco-based Twitter made public its S-1 prospectus yesterday and said it’s seeking to raise $1 billion. Twitter pegged the fair value of its common stock at $20.62 a share in August. There are 620 million shares outstanding, according to people familiar with its financials, who asked not to be named because the number was not included in the filing.