Zillow, a company offering online real estate information, today filed for an initial public offering valued at $51.8 million, and outlined annual revenue growth from $10.6 million in 2008 to $30.5 million in 2010. The company also announced that 19.4 million unique users visited its website and mobile apps in March 2011, according to a Form S-1 filed with the U.S. Securities and Exchange Commission.
Zillow has raised $87 million from outside investors in three rounds of financing, most recently raising $30 million in 2007 in a Series C financing led by Legg Mason Capital. At the time, Zillow was valued at $400 million, Bloomberg has reported. Competing online real estate company Trulia has also announced consideration of an IPO.