
The IPO would value Zynga between $7.7 billion and $9.04 billion. Electronic Arts has a market value of $7.73 billion, while Activision Blizzard Inc's sites at $14.21 billion.
Zynga was established five years ago, and got its success with viral games such as FarmVille. The games are free to play, but Zynga makes money by selling virtual items in the games to players.
Zynga's IPO follows that of Groupon Inc and LinkedIn Corp earlier this year. Both helped to revive a market for first-time share sales that had remained weak in recent years.