Real estate website Zillow.com has increased the price of their IPO to $16-$18 per share from $12-$14. Now Zillow has a valuation of close to $500 million. Zillow will trade under the stock symbol “Z” on the NASDAQ. Zillow is aiming to raise about $71.6 million in the IPO. Zillow currently has about 100 million U.S. homes listed for rent and for sale. Zillow is the third most visited real estate website in the U.S.