market cap is probably effected by what they make off the IPO. Bloomberg has 1,528.25M, Motley Fool has 701.5M. IPO Scoop has 708M, others haven't claimed any figures at all. http://www.bloomberg.com/quote/WLH:US http://www.fool.com/quote/nyse/william-lyon-homes/wlh http://www.iposcoop.com/index.php?option=com_content&task=view&id=3137&Itemid=134