Not sure, but so far today all I've seen are: 50,000 20,000 250 100 http://www.investorpoint.com/stock/ASYTQ-Asyst+Technologies+Inc./market-makers-level2/ ....amybe it's a combination, that you're seeing of 300 and 500 http://stockcharts.com/h-sc/ui?s=ASYTQ&p=D&yr=0&mn=6&dy=0&id=p24850464018