San Francisco -- Zynga, the San Francisco-based social games publisher behind such popular titles as "CityVille," "FarmVille" and "Mafia Wars," plans to raise as much as $1 billion in its upcoming initial public offering (IPO), the company revealed Friday in a filing with the Securities and Exchange Commission (SEC). The company, which would be valued at approximately $7 billion, said it plans to sell 100 million shares for $8.50-$10 each, listing its shares under the symbol "ZNGA" on the Nasdaq Global Select Market. Underwriters, led by Morgan Stanley and Goldman Sachs also will have the option to purchase an additional 15 million shares, if demand warrants. Founded in 2007, Zynga said that 54 million people worldwide play its games each day. The company first signaled its intention to go public in July.